WATER TEMPERATURE CONTROL SYSTEM AND METHOD

Abstract

A programmable system with user interface control for water flow rate or water temperature. Embodiments of the invention include a water temperature control system for a shower.

Claims

1. A showering system controllable by a user, comprising: a controller for use with a shower head, the shower head configured to receive hot and cold water, the controller providing an operating mode for the user to select one or more showering system settings to flow water through the shower head, wherein the controller automatically provides one or more signals to blend the hot and cold water during one or more showering steps to send blended hot and cold water through the shower head at a predefined temperature specified by the user, the controller including a microcomputer, the controller configured for use with a programmable device.

2. The showering system of claim 1, wherein the operating mode includes a member selected from a group consisting of a user selectable operating mode, a default operating mode, and combinations thereof.

3. The showering system of claim 1, wherein the controller recognizes voice control commands by the user to permit the controller to automatically provide the one or more signals to blend the hot and cold water during the one or more showering steps to send the blended hot and cold water through the shower head at the predefined temperature specified by the user.

4. The showering system of claim 1, wherein the controller recognizes voice control commands by the user using a cloud-based voice recognition capability.

5. The showering system of claim 1, wherein the controller is enabled for voice control command.

6. The showering system of claim 1, wherein the controller is configured to initiate an audible signal to communicate to the user that the temperature is at the predefined temperature specified by the user.

7. The showering system of claim 1, wherein the controller is configured to learn user preferences for the showering system settings.

8. A method for showering controllable by a user, comprising: providing a showering system controllable by the user having a controller for use with a shower head, the shower head configured to receive hot and cold water, the controller providing an operating mode for the user to select one or more showering system settings to flow water through the shower head, wherein the controller automatically provides one or more signals to blend the hot and cold water during one or more showering steps to send blended hot and cold water through the shower head at a predefined temperature specified by the user, the controller including a microcomputer, the controller configured for use with a programmable device; and selecting a shower system setting to flow water through the shower head.

9. The method of claim 8, wherein the showering system further includes a programmable device configured for wireless communication with the controller, the programmable device including a processor and a non-transitory computer readable medium, the non-transitory computer readable medium including instructions configured to permit the user to remotely run, modify, or program the one or more showering system settings of the controller to select the predefined temperature specified by the user and further comprising programming a shower system setting, running a shower system setting, and modifying a shower system setting.

10. The method of claim 8, wherein the operating mode includes a member selected from a group consisting of a user selectable operating mode, a default operating mode, and combinations thereof.

11. The method of claim 8, wherein the controller recognizes voice control commands by the user to permit the controller to automatically provide the one or more signals to blend the hot and cold water during the one or more showering steps to send the blended hot and cold water through the shower head at the predefined temperature specified by the user and further comprises using a voice command to signal to the controller to blend the hot and cold water.

12. The method of claim 8, wherein the controller recognizes voice control commands by the user using a cloud-based voice recognition capability.

13. The method of claim 8, wherein the controller is enabled for voice control command.

14. The method of claim 8, wherein the controller is configured to initiate an audible signal to communicate to the user that the temperature is at the predefined temperature specified by the user.

15. The method of claim 8, wherein the controller is configured to learn user preferences for the showering system settings.

16. A method for showering controllable by a user, comprising: providing a showering system controllable by the user having a controller for use with a shower head, the shower head configured to receive hot and cold water, the controller providing an operating mode for the user to select one or more showering system settings to flow water through the shower head, wherein the controller automatically provides one or more signals to blend the hot and cold water during one or more showering steps to send blended hot and cold water through the shower head at a predefined temperature specified by the user, the controller including a microcomputer, the controller configured for use with a programmable device and a programmable device configured for wireless communication with the controller, the programmable device including a processor and a non-transitory computer readable medium, the non-transitory computer readable medium including instructions configured to permit the user to remotely run, modify, or program the one or more showering system settings of the controller to select the predefined temperature specified by the user; and selecting a shower system setting to flow water through the shower head.

17. The method of claim 16, wherein the operating mode includes a member selected from a group consisting of a user selectable operating mode, a default operating mode, and combinations thereof.

18. The method of claim 16, wherein the controller recognizes voice control commands by the user to permit the controller to automatically provide the one or more signals to blend the hot and cold water during the one or more showering steps to send the blended hot and cold water through the shower head at the predefined temperature specified by the user and further comprises using a voice command to signal to the controller to blend the hot and cold water.

19. The method of claim 16, wherein the controller recognizes voice control commands by the user using a cloud-based voice recognition capability.

20. The method of claim 16, wherein the controller is enabled for voice control command.

Description

DRAWINGS

[0018] Other aspects and advantages of the present invention will be more clearly understood by those skilled in the art when the following description is read with reference to the accompanying drawings wherein:

[0019] FIG. 1 illustrates, schematically, a shower embodiment of a water temperature control system according to the invention;

[0020] FIG. 2A illustrates an alternate embodiment of the water temperature control system comprising a tankless or flash heater;

[0021] FIG. 2B illustrates another embodiment of the water temperature control system which redirects cooled water from a hot water supply line;

[0022] FIG. 2C illustrates still another embodiment of the water temperature control system which provides for recycling of cooled water from a hot water supply line;

[0023] FIG. 3 illustrates a user interface of the water temperature control system and an associated water usage monitoring system;

[0024] FIG. 4 illustrates a sequence of steps associated with account initialization in the water usage monitoring system;

[0025] FIGS. 5A and 5B illustrate a programmed shower sequence in flowchart format;

[0026] FIG. 6 illustrates a programmed shower sequence, in flowchart format, according to another embodiment;

[0027] FIG. 7 illustrates a manual shower operation in flowchart format;

[0028] FIG. 8 illustrates, in flowchart format, a process for controlling temperature and flow rate, of water; and

[0029] FIG. 9 illustrates, in flowchart format, a purge and reuse procedure.

[0030] Like reference numbers are used throughout the figures to denote like components. Numerous components are illustrated schematically, it being understood that various details, connections and components of an apparent nature are not shown in order to emphasize feature of the invention. Various features shown in the figures are not shown to scale in order to emphasize features of the invention.

DETAILED DESCRIPTION

[0031] Before describing in detail particular methods, components and features relating to the invention, it should be observed that the present invention resides primarily in a novel and non-obvious combination of elements and method steps. So as not to obscure the disclosure with details that will be readily apparent to those skilled in the art, certain conventional elements and steps have been presented with lesser detail, while the drawings and the specification describe in greater detail other elements and steps pertinent to understanding the invention. The following embodiments are not intended to define limits as to the structure or method of the invention, but only to provide exemplary constructions. The embodiments are permissive rather than mandatory and are illustrative rather than exhaustive.

[0032] A programmable system is described for controlling the flow rate or temperature of water output from hot and cold water lines to a shower, tub, sink, pool, or ornamental pond. Embodiments of the invention include a water temperature control system (TC System) 12 for commercial or personal use. Illustrated embodiments of the TC System 12 are also water usage control systems. The system 12 provides a user with a programmable temperature and time control sequence, e.g., for showering with a timed sequence of water temperatures and flow rates. Programming and operation of the system, including water temperature control, may be effected through a remote user interface, e.g., a mobile device application (“app”) or application software, an internet enabled (“smart”) appliance hub, or a browser. The programmable temperature control sequence may be pre-programmed and is programmable by the user in advance of or at the time of use. The system 12 may also learn personal preferences and modify the program sequence accordingly.

[0033] The illustrated control sequence of water temperatures and flow rates includes a water purge operation, a reheat operation or a reuse operation to remove cool water from a hot-water line (i.e., a supply pipe) so that only water meeting predefined temperature criteria is delivered for use. Water and energy usage data may be stored in the system 12 or uploaded to a remote server for aggregation with similar use data by others in an online community, e.g., as part of a water usage monitoring (WUM) system. This enables assessment of water and energy conservation resulting from use of the system.

[0034] With reference to FIG. 1, an embodiment of the water temperature control system 12 includes a remote user interface 16 configured to reduce waste of cooled water during the process of delivering heated water for use. An improved shower experience is provided by eliminating manual adjustments and fiddling with controls to find a desired water temperature or flow rate setting. The system improves temperature and flow rate control, reduces time spent in the shower, reduces water usage, and reduces energy consumption by reducing hot water usage. The system 12 can provide an improved showering experience, e.g. for elderly and disabled persons, by reducing the physical effort required to adjust settings. Instead, a control device, e.g., a controller or a remote, hand-held unit performs adjustments. The device which performs the adjustments may be responsive to voice control commands to program the sequence of water temperatures and flow rates to further improve the ability of users to control the system, particularly by persons who are handicapped or who have reduced mobility. Embodiments of the invention may provide diagnostics for water heater or shower hardware with functions such as alerting the user when a water heater provides a water temperature above or below a predefined range, or alerting the user when there is restricted flow in the cold water supply, the hot water supply, or the shower head. Other features of the invention may include an ability to compute and report actual savings of water, time, energy, and green house gases; convert water, time and energy savings to monetary units; make such data available to individual users; and report aggregate cost savings data acquired from multiple users to members in a community participating in online monitoring.

[0035] The disclosed water-conserving systems and methods may provide more reliable temperature and flow delivery than has been available. The TC System 12 is programmable to facilitate ease of access and customization. This capability is particularly advantageous to assist elderly and disabled persons. Generally, the TC System 12 enables a user to select, modify, and initiate a sequence 20 of programmed water temperatures and flow rates. In one series of embodiments a learning application adjusts a programmed sequence of timed temperature and flow rate settings to suit personal preferences. Embodiments of the system are suited for commercial use, use in public venues (e.g., fitness facilities) and hotels and home use. The systems 12 may be provided by retrofitting existing plumbing systems or by installation of new systems in new construction. Summarily, embodiments of the invention provide enhanced temperature and flow control of water, with resultant water and energy conservation.

[0036] The term “control device” refers to an electronics unit including but not limited to one of a wall mounted base station, hand-held smart mobile device 240, tablet computer, laptop computer 332, personal computer 336, game controller, joystick, or other device with which the TC System 12 may be operated.

[0037] The terms “network interface” and “internet interface” refer to an internet connection or other network connection including but not limited to a wired connection, a wi-fi connection, or other device interface, through which the water TC System 12 may be directed. A cell phone application which interfaces with the system 12 may provide convenient access to the user which appears instantaneous, while layers of complexity necessary to support the service remain transparent. The type of internet interface is not limiting of the scope of the present invention.

[0038] The term “temperature mixing valve” or “mixing valve” refers to a three-way valve for receiving water inputs from both a hot water supply and a cold water supply and providing a blended temperature water output. The mixing valve may be manually or automatically controlled.

[0039] The term “mixed-temperature water” refers to water for which temperature could be adjusted by varying the proportions of water derived from hot and cold supply lines. In accord with several embodiments of the invention, mixed-temperature water 44 of temperature Tm is the output result of mixing the input cold water 100 and the input hot water 96.

[0040] The term “plumbing system” refers to any water-control systems including showers, tubs, sinks, pools, or ornamental ponds. Plumbing systems generally include a hot water supply line 144 (including hot line manual shutoff valve 268) delivering hot water 96, a cold water supply line 148 (including cold line manual shutoff valve 272) delivering cold water 100, and a means for mixing hot water 96 and cold water 100 such as, for example, a manual mixing valve 64. Plumbing systems may include a water delivery device such as a shower, tub, sink, pool, or ornamental pond.

[0041] For the algorithm illustrated in FIGS. 5 and Table 2 below, input water flow rates are given as a percentage of flow rates which occur when input valves 128 and 124 of FIG. 1 are fully open. When the powered valve 128 is fully open, the input cold water flow rate Fe is 100; and when the powered valve 124 fully open, the input hot water flow rate Fh is 100. With this convention, the mixed water flow rate Fm may be compared to the sum of the input hot water flow rate Fh and the input cold water flow rate Fe, ignoring any time lag in water flow. Adding Fe and Fh, the mixed temperature water flow rate Fm in this convention ranges from Oto about 200. A fairly high desired water flow rate, e.g. a flow rate set point Fsp, of 150 in FIG. 5 is therefore reasonable and within expected range.

[0042] The term “set point” refers to a desired value at the point of water delivery, e.g. the shower head. The exemplary temperature control sequence lookup chart in Table 2 (table described below with FIG. 5) specifies a mixed-temperature water temperature set point Tsp (e.g. 105° F., 41° C.) and a mixed-temperature water flow rate set point Fsp (e.g. 150).

[0043] In the alternative, Fe, Fh, Fm, and Fsp may be stated in units such as gallons or liters per minute. This facilitates aggregation of water usage data in a water usage monitoring (WUM) system 244.

[0044] The water temperature control (TC) system 12 comprises an internet interface 36 (not shown), a controller 32, one or more programmable temperature control sequences 20, a programmable thermostatic control algorithm, and an assembly of sensors, valves, controls, and meters in a plumbing system. The controller 32 interfaces with the sensors, valves, controls and meters to control valve operations, and monitors sensor and meter outputs and other parameters in conjunction with performing system processes. The illustrated controller 32 is a microcomputer containing a processor, storage and memory. As illustrated in FIG. 1, the TC system 12 may be implemented in new construction or a retrofit of a conventional plumbing system consisting of a shower 60 having a hot water supply line 48 and a cold water supply line 52 which feed a shower head 56 through a manual mixing valve 64. The manual mixing valve 64 is positioned in a first branch line 102 between a normally open (NO) hot supply control valve 168 and a normally open (NO) cold supply control valve 176. The first branch line extends between the hot water supply line 48 and the cold water supply line 52 to receive hot and cold water via a hot supply T fitting 172 and a cold supply T fitting 180. The TC system 12 includes a second branch line which also extends between the hot water supply line 48 and the cold water supply line 52 to receive hot and cold water via a hot supply T fitting 172 and a cold supply T fitting 180. A 4-way fitting 76 is positioned in the second branch line between a normally closed (NC) hot water control valve 116 and a normally closed (NC) cold water control valve 120. The first and second branch lines are arranged in parallel between the T fittings 172, 180. Based on valve settings in the branch lines, the TC system either sends water to the shower head 56 through the first branch line 102 or through the second branch line 106. In either case, water flows through the 4-way fitting 76 to reach the shower head 56.

[0045] The exemplary TC System 12 of FIG. 1 includes two water line segments in series that receive mixed-temperature water 44. The first segment, referred to as the Manually Controlled (MC) mixed water line segment 68, is connected to provide as the sole output to the shower head 56 a mixture of hot and cold water from the first branch line 102, only under the manual control of mixing valve 64, e.g., when the TC system 12 is in a default power-off mode. The second water line segment, referred to as the Programmably Controlled (PC) mixed water line segment 72, is connected to receive either (i) a mixture of hot and cold water only under the control of the manual mixing valve via the first water line segment 68, or (ii) a mixture of hot and cold water from the second branch line 106 solely under the control of the TC System 12, which operates control valves causing water flow to bypass the manual mixing valve 64.

[0046] Control valves 168, 176 are powered closed when the shower TC System 12 is in use. The PC mixed water line segment 72 and the MC mixed water line segment 68 are connected in series to carry mixed-temperature water 44 to the shower head from the manual mixing valve 64 when the TC System 12 is not in active use, i.e., not powered. With the addition of the exemplary TC System 12, 4-way fitting 76 is connected to receive water from three input ports 80, 84, and 88, and to provide water through one output port 92. The arrangement enables the PC mixed water line segment 72 to receive water from two inputs downstream of the manual mixing valve: hot water 96 from a hot water line segment 104 (described below) and cold water 100 from a cold water line segment 108 (described below).

[0047] The MC mixed water line segment 68 feeds water 112 output from the manual mixing valve 64 into the PC mixed water line segment 72 via a first input port 80 to the 4-way fitting 76. The hot water line segment 104 is connected to receive hot water from the supply line 48 through a hot supply T fitting 172, and is connected to a powered hot water control valve 116 (described below) to send the hot water 96 to the PC mixed water line segment 72 via a second input port 84 to the 4-way fitting 76. This bypasses the manual mixing valve 64 to provide hot water 96 from the hot water line segment 104 directly to the PC mixed water line segment 72. The cold water line segment 108 is connected to receive cold water from the supply line 52 through a cold supply T fitting 180, and is connected to a powered cold water control valve 120 (described below) to send the cold water 100 to the PC mixed water line segment 72 via a third input port 88 to the 4-way fitting 76. This bypasses the manual mixing valve 64 to provide cold water 100 from the cold water line segment 108 directly to the PC mixed water line segment 72. Thus, the TC System 12 provides a mixture of hot and cold water to exit the output port 92 of the 4-way fitting 76 for delivery to the shower head 56. With this configuration the TC System 12 hot water line segment 104 and cold water line segment 108 bypass the manual mixing valve 64 to operate the TC System 12 independently from operation of the manual mixing valve 64.

[0048] The hot water line segment 104 and the cold water line segment 108 include inline normally closed (NC) powered valves 116 and 120 respectively, which valves are in a closed position when the TC System 12 is unpowered and inactive. The NC powered valves 116, 120 are adjustable only to (i) a fully closed position when the TC System 12 is unpowered and not operating, or (ii) a fully open position when the TC System 12 is powered and operating. A powered flow control valve 132 between the 4-way fitting 76 and the shower head 56 provides control of mixed-temperature water 44 to the shower head 56.

[0049] A powered normally open (NO) hot water valve 124 positioned in the hot water supply line 48 controls the input hot water flow rate Fh of hot water 96 fed through the second water input port 84 through the 4-way fitting 76 to the shower head 56. A powered NO cold water valve 128 positioned in the shower cold supply line 52 controls the input cold water flow rate Fe of cold water 100 fed through third water input 88 through the 4-way fitting 76 to the shower head 56. Simultaneous control, alternate control or individual control of the powered hot water control valve 124 and the powered cold water control valve 128 provide mixing adjustment capability to control temperature of water flow to the shower head 56 and, within limits set by the powered flow control valve 132, the flow rate Fm, of water flow to the shower head 56.

[0050] With reference to the embodiment of FIG. 1, a feature of the TC System 12 is inclusion of a pair of normally open (NO) control valves to disable the manual mixing valve when the TC System is in use. One NO control valve 168 is placed between the hot supply T fitting 172 and the manual mixing valve 64, and one NO control valve 176 is placed between the cold supply T fitting 180 and the manual mixing valve 64. Flow from the hot water supply line 48 and cold water supply line 52 into the manual mixing valve 64 is cut off by powering the NO control valves 168, 176 into closed positions. When the TC System 12 is not powered for use, the two NO control valves 168, 176 are in the open positions. When the TC System 12 is powered for use, the two NO control valves 168, 176 are in the closed positions to prevent egress of water from the manual mixing valve 64 into the MC mixed water line segment 68 and toward the shower head 56.

[0051] A hot water line temperature sensor 184 is positioned in the hot water supply line 48 to measure a hot water temperature Th. A cold water line temperature sensor 192 is positioned in the cold water supply line 52 to measure a cold water temperature Tc. A mixed water temperature sensor 200 positioned in the PC mixed water line segment 72 measures the temperature, Tm, of mixed water dispensed through the point of water delivery which, in this example, is a shower head 56. A flowmeter 136, positioned in the PC mixed water line segment 72, measures the flow rate, Fm, of mixed-temperature water 44 passing through the shower head 56. In the embodiment of FIG. 1, a powered flow control valve 132 is positioned in the PC mixed water line segment 72 downstream of the 4-way fitting 76 to modify the flow rate Fm of water 44 dispensed through the shower head 56 based on measured flow rate Fm and user selection of flow rate, i.e., with a selectable flow rate set point Fsp.

[0052] Referring to FIG. 5, the programmable temperature control sequence 20 of timed steps may include a purge operation 288 to remove cooled-down water 216 from the hot-water supply line 48 by sending the water through the shower head 56 and down the drain (not shown). To limit water loss, the purge operation 288 is shortened by the TC System 12 by monitoring the temperature Tm and signaling (e.g., audibly or with LED display lights) when the mixed temperature water 44 is at the predefined setpoint temperature Tsp. An automatic control may stop the purge operation 288 when a set point temperature Tsp is reached.

[0053] In other embodiments the programmable temperature control sequence may include a re-use option that removes cooled-down water 216 from the hot-water supply pipe 48 to assure that only water within a predefined range is delivered for use. With reference to FIGS. 2A, 2B, and 2C, embodiments are illustrated which capture, divert, or use the cooled water 216 obtained from the hot water supply pipe 48. FIG. 2A illustrates a tankless or flash heater 224 which separately heats the cooled water 216 for further use as part of the hot water supply 48. In the embodiment of FIG. 2B a powered hot water control and diverter valve 260 is used to send the cooled water 216 to a home reservoir or holding tank 228, e.g., for re-use as a cold water supply or for flushing a toilet. In the embodiment of FIG. 2C a powered hot water control and diverter valve 260 is used to send the cooled water 216 to a home or commercial water heater 232 for reheating and further use as a hot water supply. These re-use options reduce the waste of potable water which would otherwise be sent down the drain with no benefit received.

[0054] The water temperature control may be operated with a wall mounted base station (not shown), hard-wired, or wirelessly connected to the controller 32, or through any of a number of remote interfaces such as a mobile device 240 app, or through an internet browser on a personal computer 336 or other device. The programmable temperature control sequences 20 may be used as pre-programmed by a vendor or a user, or these may be adjusted online or at the time of use or with a learning capability by which the program sequence learns personal preferences. An embodiment includes use of the powered flow control valves 124, 128 to provide an automated water flow rate control which may include a shower massage flow rate and other flow control settings. Table 1 illustrates an exemplary set of shower sequences 20 in the shower program, each comprising a sequence of N steps.

TABLE-US-00001 TABLE 1 An exemplary set of shower sequences Step Temperature Flow rate Time td (min) Notes Program Sequence 20-1, N = 7 1 Medium Medium 1 Wash face 2 Cool Medium 2 Shampoo hair 3 Cool Low 1 Condition hair ends 4 Medium Low 2 Soap up 5 Medium Medium 2 Rinse off 6 Hot High 1 Shoulder massage 7 Cool Medium 1 Rinse hair 10 Total minutes Program Sequence 20-2, N = 4 1 Medium Medium 1 Wash face 2 Medium Low 2 Soap up 3 Medium Low 5 Shave 4 Medium Medium 2 Rinse off 10 Total minutes Program Sequence 20-3, N = 7 1 Medium Medium 1 Wash face 2 Cool Medium 2 Shampoo hair 3 Medium Low 1 Condition hair ends 4 Medium Low 3 Soap up 5 Medium Medium 2 Rinse off 6 Hot High 2 Shoulder massage 7 Cool Medium 1 Rinse hair 12 Total minutes Program Sequence 20-4, N = 1 1 Hot High 3 Soap up, rinse off 3 Total minutes

[0055] Exemplary values for cool, medium, and hot temperatures are 80° F. (27° C.), 105° F. (41° C.), and 120° F. (49° C.), respectively. Exemplary values for low, medium, and high flow rates are 50, 100, and 150 respectively, using the convention described in the description of FIG. 1 of valves 124, 128. These exemplary values are used in the description of FIG. 5 below.

[0056] Water and energy usage data may be saved or uploaded to a remote server for aggregation with similar use data for an online community, as part of a water usage monitoring (WUM) system 244. This enables assessment of water and energy conservation success. The WUM 244 system may monitor usage of a plurality of water flow or temperature control devices on a network using one or more computers. FIG. 3 illustrates a WUM system 244 connected to an exemplary programmable TC System 12 as well as a plurality of additional TC systems 12 in an online community 312. The exemplary programmable TC System 12 is shown comprising sensors 280, actuators 276, a user interface 16 and a controller 32. Infrastructure for data transmission comprises a cable or wireless data link 304, a wireless data link 308, a router/modem 324, an internet service provider (ISP) 320, and the internet 300, over which communication of data 326 occurs for assimilation and reporting by the WUM system 244. The wireless data link 308 may use Blue Tooth or other wireless technology. The TC system 12 controller 32 may be a programmable logic controller either hard-wired or with a wireless communication connection. One or more programmed sequences 20 may run on the controller 32 rather than on a WUM 244 via the internet 300 to avoid internet service 328 communication rate variability and connectivity problems which can occur with variations in network traffic and signal strength.

[0057] The WUM system 244 may include capabilities typically associated with an online community, including user account registration, device-to-user account pairing, software updates, and a user interface 16. The WUM system 244 may comprise application-specific capabilities associated with a user baseline, user preferences, and sequence modification storage and access. The WUM system 244 may comprise computational and reporting capabilities typically associated with data aggregation including reporting of water and energy usage. The WUM system 244 may also include capabilities to propose alternate sequences that reduce levels of water and energy consumption. FIG. 4 shows an example of a typical account initialization sequence, which may include device installation, power and checkout; user account registration; device pairing with the user account; and user account management.

[0058] The flow chart of FIG. 5 illustrates programmed shower operation based on Program 1 of Table 1, comprising an exemplary sequence of seven shower steps (i.e., N=7). The example shower sequence is implemented from a look-up table illustrated in Table 2. Each step in the sequence (n=1 to 7) has a selectable time duration td, indicated in Table 1. The total (cumulative) lapsed time at the end of each step is indicated as tn, indicated in Table 2.

TABLE-US-00002 TABLE 2 N tn Tsp (° C.) Fsp 1  1:00 41 100 2  3:00 27 100 3  4:00 27 50 4  6:00 41 50 5  8:00 41 100 6  9:00 49 150 N = 7 10:00 27 100

[0059] Initially the user engages the user interface 16. The controller 32 responds by displaying choices of shower sequences 20, and the user selects or modifies a sequence 20, then initiates the shower sequence 20 (e.g. Table 1 Program 1). The controller 32 creates a look-up table (e.g. Table 2) from shower sequence 20, and initiates system parameters from the look-up table (e.g. N=7, n=1, tn=1:00, Tsp=41° C., Fsp=100). A timer function in the controller 32 is initiated to C1=00:00, and the controller 32 powers on the NC and NO valves to programmed positions. The NO valves 168, 176 are activated to prevent water flow to the manual mixing valve 64, and the NC valves 124, 128 are activated to permit water flow into the 4-way fitting 76. Controller 32 initiates a purge or reuse procedure 288 for cooled hot water 216 based on installation-specific purge/reuse settings. An example purge/reuse procedure 288 for the embodiments of FIGS. 2A, 2B, and 2C is illustrated in FIG. 9. The timer function, is used in the purge/reuse procedure to monitor the time and water used for purge/reuse. Controller 32 monitors sensors: hot water temperature sensor 184, cold water temperature sensor 192, and mixed water temperature sensor 200; valve settings: hot water in-line normally open (NO) powered valve 124 and cold water in-line normally open (NO) powered valve 128; and mixed water flowmeter 136 for measured values Th, Tc, Tm, Fh, Fe, and Fm, respectively. The controller executes a control loop procedure 292 that controls actuators and which, in this example, are valves 124, 128, and 132, that adjust the measured Tm to the initial set point Tsp, and to adjust the measured Fm to the initial set point Fsp. An example control loop procedure 292 is illustrated in FIG. 8. Controller 32 displays system status and initiates a first audible signal to communicate to the user that the temperature and flow rate are at the set points. A timer function in the controller 32 counts a delay period which, in this example, is 10 seconds, for the user to enter the shower. Referring also to Fig SB, controller 32 displays system status and a second audible signal, to communicate to the user that the beginning of the shower sequence 20 has been initiated. Controller 32 starts another timer function C2=00:00 corresponding to the values of tn in Table 2. Controller 32 again displays a system status, and counts a delay (e.g. 1 second). Controller 32 compares the value C2 of the timer function to tn (e.g. 1:00), and if C2 is less than tn, then controller 32 executes the control loop 296 to maintain Tm at Tsp, and Fm at Fsp, and once again displays a system status. If, after another 1 second delay, C2 is no longer less than tn, the step in the sequence 20 is complete and the controller increments the sequence step counter n (e.g., n=2), and compares n (e.g., n=2) to the number of steps N (e.g., N=7) in the sequence 20. If n is less than N+1, the controller 32 reads new system parameters from the look-up table (e.g. tn=3:00, Tsp=27° C., Fsp=100), and executes control loop procedure 292 to sense measured values and operate actuators to adjust Tm and Fm to the new set points Tsp and Fsp, respectively. In this regard, the term “adjust” denotes bringing Tm and Fm to new set points Tsp and Fsp, respectively, while the term “maintain” denotes keeping Tm and Fm at current set points Tsp and Fsp respectively. Controller 32 counts a time delay, checks clock C2, senses measured parameters, and maintains Tm and Fm at Tsp and Fm, respectively, throughout each step in the sequence. Controller 32 continues execution of steps in the sequence until the incremented value in the sequence step counter n is no longer less than N+1, in which case controller 32 displays a current system status and a third audible signal, to communicate to the user the end of the shower sequence 20. Controller 32 next sends signals to gradually power down valves 124, 128, and then sends signals to power down valves 116, 120, 168, 176. This returns the TC system 12 to a powered-down, inactive state, enabling the manual valve 64 to control water flow to the shower head 56. The foregoing description is exemplary of delay times, lookup table values, and use of audible signals.

[0060] FIG. 6 illustrates an exemplary subprogram by which a user may modify the programmed shower operation sequence 20 of FIGS. 5 and Table 1. Water temperature control functions effected with a user interface 16 may include an in-situ manual override of the programmed sequence 20 to modify shower sequence, go back, or change current or future setpoints. A learning capability may be employed, in which case the program learns individual preferences of a user and adjusts the program sequence 20 for future use. FIG. 6 illustrates implementing the user modifications in the control loop procedure 298, which procedure may modify look-up table values including step time tn, before continuing similarly to control loop procedures 292, 296 as included in FIG. 5.

[0061] FIG. 7 summarily illustrates the manual shower operation sequence. When the TC system installed, and the TC system is unpowered, the system 12 is in a manual operation mode by default, where NO valves 116, 120, 124, 128 are fully open to allow water to flow to the manual mixing valve 64, and NC valves 116, 120 are fully closed to block any water flow which would otherwise bypass the manual mixing valve 64. The default manual operation mode enables the shower to operate manually in the event of a power failure. To operate the shower manually, the user opens the manual mixing valve 64, modifies the manual mixing valve 64 settings as desired, and after use closes the manual mixing valve 64.

[0062] The flow chart of FIG. 8 illustrates an exemplary procedure for the control loops 292, 296, 298 which effect mixed-temperature water temperature Tm and mixed water flow rate Fm. Controller 32 reads current parameters (e.g. N=7, n=5, tn=8:00, Tsp=41° C., Fsp=100) from a look-up table (e.g. Table 2) for one of the shower sequences 20 (e.g. Table 1). Controller 32 monitors values of hot water temperature sensor 184, cold water temperature sensor 192, mixed water temperature sensor 200 and mixed water flowmeter 136: Th, Tc, Tm, and Fm. In order to reach mixed-temperature water temperature set point Tsp by mixing hot water at temperature Th with cold water at temperature Tc, Tsp needs to be higher than Tc and lower than Th. If this is not the case, controller 32 sends a temperature error display and, in this example, performs a shutdown of the system 12. If Tsp is between Tc and Th, then controller 32 commands powered flow control valve 132 to increase or decrease flow of mixed-temperature water 44 until Fm is at the setpoint flow rate, Fsp (e.g., Fm reaches Fsp=100). Controller 32 may incrementally open or close valves 124, 128 to increase or decrease Fh and Fe respectively, to provide fine control of Fm and Tm. Controller 32 counts a delay which, in this example, is for 1 second. Controller 32 compares the timer function value C2 to tn (e.g., 8:00), and if C2 is not less than tn, the step has been completed and the controller returns to the process illustrated in FIG. 5. If C2 is less than tn, then controller 32 monitors Tc, Th, Tm, and Fm. If Fm is less than or greater than Fsp, controller 32 sends a signal to open or close valve 132 incrementally. If Tm is less than Tsp, controller 32 incrementally opens valve 124 and incrementally closes valve 128. If Tm is greater than Tsp, controller 32 sends a signal to close valve 124 incrementally and open valve 128 incrementally. Controller 32 then repeats the delay, determines whether the timer value C2 is less than tn, and continues to perform measurement and adjustment steps until tn is not less than C2, at which time the sequence step has been completed and the controller returns to the process illustrated in FIG. 5.

[0063] Water flow from the cold water supply 52 and the hot water supply 48 are mixed by the TC System 12 and adjusted to provide an output as the mixed temperature water 44 conforming to the setpoint temperature and flow rate values. Thereafter, the mixed temperature water 44 temperature Tm is continually monitored during each timed step in the sequence 20 and maintained as described above. To avoid “ringing”, i.e., repeatedly overshooting the setpoints, the choice of incremental changes to valve 124, 128, 132 positions may be optimized to limit the ringing, e.g. using a multiplicative dampening factor in the control loop algorithm. In FIG. 8, specific details, including delay times, error checking, and dampening factors are illustrative and not limiting in the scope of the present invention.

[0064] The flowchart of FIG. 9 illustrates a procedure 288 for purge and reuse of water. Before the procedure begins, controller 32 starts a timer function C1 and reads initial set points, including mixed-temperature water temperature set point Tsp and mixed temperature water flow rate set point Fsp. According to installation settings regarding 21 purge or reuse options, controller 32 may select one of three options to: (i) direct a purge operation to allow cooled-down water 216 in the hot water supply line 144 to flow through the shower head 56 to the shower drain (not shown); (ii) direct operation of tankless or flash heater 224 to heat cooled-down water 216 as shown in FIG. 2A; or (iii) initiate a reuse operation which diverts cooled-down water 216 to holding tank 228 as shown in FIG. 2B or water heater 232 as shown in FIG. 2C. Selection of option (iii) may depend on available capacity in the holding tank 228 or water heater 232, in which case the controller may initiate option (i). Whichever option is employed, according to the exemplary algorithm of FIG. 9, controller 32 opens valve 124 to 80% so Fh is 80, and opens valve 128 to 20% so Fe is 20. The exemplary algorithm of FIG. 9 limits the purge/reuse operation to 3 no more than minutes, after which time, if the system does not indicate that all cooled water has been purged from the hot water line, the controller displays a purge error message and the system is shut down. This avoids continued running of water when, for example, the water heater is not outputting water at a minimum required temperature. In 1 second increments, controller 32 monitors Th, Tc and compares them to Tsp. Initially, with cooled water in the hot water line, Th will not be greater than Tsp. After cooled-down water 216 is purged or diverted to the holding tank 228 or water heater 232 long enough for Th to become greater than Tsp, controller 32 initiates closure of powered hot water control and diverter valve 260, displays a message that the purge operation is complete, and resumes performing the process steps of FIG. 5. The foregoing description is exemplary of delay times, error checking, and initial settings.

[0065] The described illustrations are merely descriptive of principles of the invention and are not limiting with respect to embodiments. In another embodiment of the TC system, water flow from a sink is programmed for brushing teeth in three steps: providing the water flow to wet the brush, turning off the water flow, and turning the water flow back on for rinsing. At completion of the three steps, the water flow is turned off. Each of the three steps is programmed for a set time duration and is programmed for a set water flow rate. This embodiment may require a different configuration of sensors and valves and different programmed steps. The concepts which have been disclosed are also applicable to a tub fill, or a recirculating tub or spa or Jacuzzi. Those embodiments may require control and reheating of recirculating water. These and other embodiments may employ an enunciator function for auditory communication of advancing steps in a shower sequence.

[0066] Embodiments of the present invention directed to still other applications will be apparent to those skilled in the art. Numerous variations, changes and substitutions may also be made without departing from the invention. Accordingly, it is intended that the invention be limited only by the spirit and scope of the claims which follow.