Thermo Efficiency Measurement System

Abstract

Systems and methods are provided for determining an energy transfer rate of a room via one or more sensors to determine a baseline efficiency measurement of a room as well as delta efficiency gains obtained by making changes to internal or external factors affecting thermal efficiency. The system further include the automatic control for various equipment associated with the room and automatic measurement based on the status of the room.

Claims

1. A system for determining an energy transfer rate of a room comprising: a first sensor mounted in a first housing, the first sensor generating first environmental data and including: a first environmental measuring device, a first power source, a first processor, a first storage, and a first communications hardware coupled to a network; a mounting element connected to the housing such that said first sensor is freely positionable within the room; software executing on said first processor and generating first environmental data corresponding to discrete environmental measurements taken within the room at first time intervals and including time data associated with each discrete environmental measurement; a computer coupled to the network and having a computer storage accessible by said computer, said storage having threshold environmental data saved thereon; wherein a second sensor positioned outside the room generates second environmental data corresponding to environmental measurements taken outside the room and including time data associated with the environmental measurements; the first environmental data and the second environmental data transmitted to said computer via the network; software executing on said computer processing the first environmental data and the second environmental data compared to the threshold environmental data to generate an energy transfer rate of the room.

2. The system of claim 1 wherein the first environmental data is selected from the group consisting of: temperature, humidity and combinations thereof.

3. The system of claim 2 wherein the second environmental data is selected from the group consisting of: temperature, humidity, wind speed, wind direction, solar energy intensity, and combinations thereof.

4. The system of claim 3 wherein when the first and second environmental data each comprise temperature measurements and the second environmental data comprises an outside air temperature, the temperature measurements taken by the first sensor at the first time intervals are compared to the temperature measurements taken by the second sensor to calculate a temperature differential.

5. The system of claim 1 wherein at least two sensors are positioned in the room and the energy transfer rate determination further indicates efficiency of one or more portions of the room.

6. The system according to claim 1 wherein a volume of the room is considered in the energy transfer rate determination.

7. The system according to claim 1 wherein a surface area of internal surfaces of the room is considered in the energy transfer rate determination.

8. The system according to claim 1 wherein a date and a geographic location of the room is considered in the energy transfer rate determination.

9. The system according to claim 8 wherein when the room is located in a facility, the location of the room within the facility is considered in the energy transfer rate determination.

10. The system according to claim 1 wherein said computer automatically initiates the discrete environmental measurements of said first sensor based on input relating to the status of the room.

11. The system according to claim 10 wherein an occupancy sensor located in the room provides data to said computer which is used to determine the status of the room.

12. The system according to claim 10 wherein said computer automatically controls various equipment associated with the room prior to initiating the discrete environmental measurements of said first sensor.

13. The system according to claim 14 wherein the various equipment is selected from the group consisting of: motorized window shades or binds, motorized air vents associated with the room, HVAC equipment servicing the room and combinations thereof.

14. The system according to claim 1 further comprising a remote computer coupled to the network and in communication with said computer, said remote computer receiving the first environmental data and the second environmental data.

15. A system for determining an energy transfer rate of a room comprising: a sensor mounted in a housing, the sensor generating environmental data and including: a environmental measuring device, a power source, a processor, a storage, and a communications hardware coupled to a network; a mounting element connected to the housing such that said sensor is freely positionable within the room; a computer coupled to the network and having a computer storage accessible by said computer, said storage having threshold environmental data saved thereon; software executing on said processor and generating environmental data corresponding to a discrete environmental measurement taken within the room and including time data associated with the discrete environmental measurement; software executing on said computer for automatically initiating the discrete environmental measurement during based on input relating to the status of the room; the environmental data transmitted to said computer via the network; said software executing on said computer processing the environmental data compared to the threshold environmental data to generate an energy transfer rate of the room.

16. The system according to claim 15 wherein an occupancy sensor located in the room provides data to said computer which is used to determine the status of the room or to send alerts or combinations thereof.

17. The system according to claim 15 wherein at least one window or door sensor is located in the room provides data to said computer which is used to determine the status of the room.

18. The system according to claim 15 wherein said computer receives data relating to whether a user is active on a computer associated with the room and the data is used to determine the status of the room.

19. The system according to claim 15 wherein said computer automatically controls various equipment associated with the room prior to initiating the discrete environmental measurement.

20. The system according to claim 19 wherein the various equipment is selected from the group consisting of: motorized window shades or binds, motorized air vents associated with the room, HVAC equipment servicing the room and combinations thereof.

21. The system according to claim 15 further comprising a second sensor mounted outside the room and generating second environmental data corresponding to environmental measurements taken outside the room.

22. The system according to claim 21 wherein said first sensor is selected from the group consisting of: temperature sensor, humidity sensor and combinations thereof.

23. The system according to claim 21 wherein said second sensor measures temperature, humidity, wind speed, solar intensity or combinations thereof.

24. The system according to claim 15 wherein the initiation of the discrete environmental measurement is coordinated with a schedule of the set points for HVAC equipment serving the room.

25. The system according to claim 15 wherein the threshold environmental data comprises historical data associated with the room or with a facility within which the room is located.

26. The system according to claim 15 wherein the threshold environmental data comprises calculated energy transfer rates based on a configuration of the room or the construction materials of the room or a geographic location of the room or combinations thereof.

27. A method for determining an energy transfer rate of a room comprising the steps of: positioning a plurality of sensors within a plurality of different rooms in a facility; generating environmental data for a plurality of discrete environmental measurements in the plurality of rooms, each discrete environmental measurement including time data corresponding to a time when each of the environmental measurements was taken and which room the measurement corresponds to; transmitting the environmental data to a computer via a network connection; processing the environmental data based upon a rate of change of the environmental measurements over a set time period; determining an energy transfer indication of each of the rooms by comparing the environmental data with threshold environmental data.

28. The method of claim 27 wherein the computer automatically initiates the plurality of discrete environmental measurements based on input received by the computer relating to the status of the room.

29. The method of claim 27 wherein an occupancy sensor located in the room provides data to the computer which is used to determine the status of the room.

30. The method of claim 27 wherein the computer automatically controls various equipment associated with the room prior to initiating the discrete environmental measurements.

31. The method of claim 30 wherein the computer automatically shuts down HVAC equipment servicing the room or closes vents serving the room prior to initiating the discrete environmental measurements.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0034] FIG. 1 is a block diagram illustrating the system for determining energy transfer rates.

[0035] FIG. 2. is a block diagram illustrating the individual sensor in greater detail according to the system of FIG. 1.

[0036] FIG. 3 an illustration of an installation of the system and the sensing device for measuring energy transfer in a room according to FIG. 1.

[0037] FIG. 4 is an illustration of an installation of the system and the sensing device for measuring energy transfer in multiple rooms according to FIG. 1.

[0038] FIG. 5 is a flow diagram of the processing logic in capturing and monitoring or displaying a sensors data during a test according to the system of FIG. 1.

[0039] FIG. 6 illustrates a sample plot with key areas identified in a cooling cycle to be to be measured by the system of FIG. 1.

[0040] FIG. 7 is flow diagram for a room sensor according to the system of FIG. 1.

[0041] FIG. 8 is a schematic diagram of a one configuration for the sensor device according to the system of FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

[0042] Referring now to the drawings, wherein like reference numerals designate corresponding structure throughout the views.

[0043] Turning to the drawings and specifically to FIGS. 1 and 2, FIG. 1 illustrates one configuration for the system 100 for determining an energy transfer rate of a room. The system includes a computer 102 that is coupled to a sensor 130. It is contemplated that multiple sensors 130, 130, 130 may be coupled to the computer 102. Also shown in FIG. 1, are external sensors including an environmental sensor 120, a temperature sensor 122 and a humidity sensor 124. It will be understood that these external sensors may be locally mounted sensors external to a facility containing the rooms to be measured, or these may be data feeds from a network connection from a local weather measurement station or the like. Additionally, the environmental sensor 120 may comprise a number of different sensors or data feeds providing information for wind speed and direction, solar intensity and so forth. All of this type of environmental data could be factored in and used to calculate the energy transfer rate of a room. While the external sensors 120,122,124 are illustrated as being initially connected to the computer 102, it should be noted that sensors 120,122,124 may be stand-alone systems capable of transmitting their data directly to a central system (not shown) where a remote computer 200 can correlate this data with the sensor(s) 130, 130, 130 data. The intent of depicting sensors 120,122,124 is to illustrate that the data such sensors can generate can be used by the system to determine an energy transfer rate of the room regardless of how that external sensor data is obtained or routed etc.

[0044] The computer receives the sensor 130 data, which comprises discrete measurements at various time intervals. FIG. 1 is diagrammatic in that the sensors and the various data feeds to computer 102 are illustrated with lines and arrows showing the data connections between the various equipment. However, it will be understood by those of skill in the art that the sensors 130, 130, 130 may be coupled to computer 102 via a wireless low-power connection (e.g., WiFi, Bluetooth, etc.).

[0045] The computer is illustrated having a processor 104, a storage 106 and a communications interface 108 that is provided to receive and transmit data to and between the sensors 130, 130, 130. As stated above, the communications interface 108 may be adapted to communicate via a wireless low-power connection (e.g., WiFi, Bluetooth and the like). Storage 106 may include data saved thereon that is used by the processor 104 to process the data generated from environmental measuring device/sensors 132, 132, 132 and transmitted to computer 102.

[0046] Also illustrated in FIG. 1 is remote computer 200, which could be a computer that is located remotely from the facility or location where the room is being measured/analyzed. Computer 102 may be connected to remote computer 200 via a network connection where remote computer 200 is part of central network that gathers all the data to be used for historical purposes and to generate core expected values for energy transfer rates of a room. In other cases, instead of including remote computer 200, computer 102 may be located remotely from the facility or location and the measurement data may be transmitted directly.

[0047] In particular, the data that would be associated with the energy transfer rate data would include information such as, the construction materials used in the room including for example, the types of wall board and insulation and finish materials, the configuration and types of windows in the room, the flooring materials, the ceiling construction, the location of the room within the larger facility, the geographic facing of the room, the condition of the seals around the windows, the proximity of heat-generating equipment relative to the room, then number impact of heat-generating equipment in the room, etc. All this information can potentially be used to determine an expected energy transfer rate of the room and can be used to generate and/or modify base threshold expected energy transfer rates for the room.

[0048] Additionally, while certain functions such as the scheduling of when measurements are taken by the sensors 130, 130, 130 may in one configuration be initiated by computer 102, one of skill in the art will understand that software executing on remote computer 200 may send a command to computer 102 to initiate room testing. The software executing on computer 102 may receive the initiate testing command and will then process this data, which in one configuration may include simply passing this command through to the processor 134 or it may be that computer 102 generates a separate or even a supplemental command.

[0049] FIG. 2 shows the sensor 130 of FIG. 1 in greater detail. Sensor 130 includes an environmental measuring device/sensor 132 that may be adapted to measure the temperature of the room in which the sensor 130 is placed. Also shown in FIG. 2 is environmental measuring device/sensor 132 that may be adapted to measure the humidity and environmental measuring device/sensor 132 that may be adapted to perform other environmental measurements as desired. The various environmental measuring device/sensors 132, 132, 132 generate data and are coupled to processor 134.

[0050] Also shown in FIG. 2 is a storage 136 that is accessible to processor 134. Storage 136 provides the sensor a storage location for the data received from the various environmental measuring device/sensors 132, 132, 132, which can be stored until transmitted to computer 102. It is contemplated that the data can be automatically transferred as it is received, however, storage 136 provides for saving of the data in the event a wireless connection cannot be achieved. Alternatively, the processor 134 may automatically transmit the data saved on storage 136 as regular scheduled intervals. In addition to the data received by the various environmental measuring device/sensors 132, 132, 132, the testing status of the sensor can be saved and transmitted to computer 102.

[0051] A communications interface 138 (hardware) is coupled to processor 134 and is adapted to transmit data to and between computer 102. As stated in connection with FIG. 1, the connection may comprise a wireless low-power connection. A power source 131 is provided that provides power to the environmental measuring device/sensors 132, 132, 132, the processor 134 and the communications interface 138. The power source 131 may comprise any type of electrical power source such as, for example, a rechargeable battery or the like.

[0052] The sensor 130 also comprises a housing 139 within which the various electronic devices are positioned. The housing is provided with means to connect the sensor to a mounting element 140 such that said sensor 130 is freely positionable within the room or space. This allows for the sensor to be positioned at virtually any location in the space including at various elevations and at various lateral locations. This can be highly desireable to move the sensor 130 about the room so that measurements can be taken at various locations and at various heights as needed. Likewise, if the space is regularly in use, the sensor 130 can be placed in manner that reduces an impact to the use of the space. The mounting element 140 is only diagrammatically illustrated in FIG. 2, but could comprise a device that would allow the sensor 130 to be hung from the ceiling (including for example, a drop ceiling). In one configuration the sensor 130 is approximately centered with respect to the ceiling and floor of the room and measures environmental data at approximately five feet off the ground. Alternatively, the mounting element 140 could free stand on the floor and be movable about the room allowing for the sensor to be suspended at various heights. Still further, the mounting element 140 could comprise a wall-mountable element that allows the sensor 130 to be hung from the wall at various heights and/or be positioned about the room at various location and in the proximity of windows or the like.

[0053] The data transmitted from sensor 130 to computer 102 may further include a code that corresponds to the room in which the sensor 130 is located. This would enable unique identification of each sensor data such that the codes can be matched to the room in which the sensor 130 is mounted and is represented by location 141 input to processor 134.

[0054] Alternatively, location detection can also be built into the sensor as one of the environmental sensors in the form of GPS or other triangulation or location technology which is adaptable and accurate for indoors environments. When placing sensors in an enterprise location, the sensors also incorporate location services which can accurately specify the location of the sensor in a given environment. Technology has evolved to where location services for asset tracking are much more accurate than previous GPS that required satellite communication and was not accurate enough for indoor applications. Triangulation technology and other means can accurately locate latitude, longitude and height making it possible to accurately within a meter to locate a sensing device in an office building.

[0055] Since the sensors may be moved into and out of office locations and used for tests of a transient nature, this localization of the sensor is very important to correlate the results with a given location or customer. When customers and prospects are added, a location is mapped to the software detailing the customer site and where it is located allowing one to identify that a test is being done in a particular customer site. Further, as the sensor is moved into a particular location in the office, a location of latitude, longitude and height is also sent and a room or a particular office mapping can be done when the sensor is placed.

[0056] Alternatively if a floor plan or office map is provided and some initial coordinates can be mapped with the sensor, for example the front door and a few additional points, the localization of the sensor within the office environment or building can be mapped to the floor plan based on the reported location.

[0057] Allowing the sensor to accurately determine its own location and to map this to a known office location based on a floor plan or a relative position within the office is helpful to map the test results to a particular room on the premises where the tests are being conducted.

[0058] It is further contemplated that the sensor 130 may also be equipped with one or more local indicators or displays such as LEDs or a display panel that indicates the status of the test and can enable access to the test results.

[0059] After receiving the measurement data from sensor(s) 130, 130, 130, computer 102 stores the results in storage 106. This data can be combined and analyzed by the processor 104 and reports or alerts may be generated to indicate test results or status.

[0060] As described above, computer 102 may also receive supplementary data from external feeds, which may be external computers, databases, or news feeds. These feeds could include, external environmental data such as temperature (outside), humidity, wind and other environmental data are received over the wireless interface and stored and combined in local storage 106.

[0061] Turning now to FIG. 3, rendering of an installation of the sensor 130 in a room in a facility is illustrated. The sensor 130 is placed in the room 10 and uses a wireless interface to communicate the results of the measurements. In this configuration, for example, the sensor 130 could be measuring the temperature of room 10. Additionally, the outside temperature could also be measured by means of an outside air temperature measurement device 20. Alternatively, the outside air temperature could comprise a data feed via the network connection. While mounting element 140 is depicted in this configuration as an element allowing sensor 130 to hang down from the ceiling, the mounting element 140 could comprise a floor-mounted element or a wall-mounted element as desired.

[0062] FIG. 4 is a rendering of an installation of multiple sensors 130, 130 located in multiple different rooms 10, 12 in a facility. The sensors 130, 130 could be networked together enabling them to measure multiple spaces. In this instance, they are positioned in different room and connected to a common wireless network to computer 102. Computer 102 collects the temperature and environmental data from sensors 130, 130. In this configuration, outside air temperature is also monitored and stored to enable a comparison between the outside temperature and the inside temperature to determine the differential. The computer 102 can then communicate the individual or the combined results to computer 200 via an external network. It is also understood that depending on room size, it may be desired to provide multiple sensing devices within the same space/room. In this manner, the rate of change of temperature in different portions of the room could indicate where within the room thermal efficiency leaks are occurring.

[0063] FIG. 5 depicts a flow diagram of the processing logic in capturing and monitoring or displaying a sensors data during a test and is described in a series of logic steps. The room sensor 150 captures temperature readings in a loop at intervals, typically in the 5 second range. The data is then transmitted from the sensor. Within the MQTT message the data is formatted as a JSON (name value pair) message. An MQTT broker 152 captures the data and then transmits it to a visualization module 154, which stores the data in a database 156. From this data in the database, a set of widgets can be developed and used using a widget dashboard 158. Data can also be extracted, for example, like time series data 160, which can be fed to an external analysis engine 162. The external analysis engine 162 can then build up static data sets for the building 164 or for a particular room 166. This model can be replicated for multiple buildings/facilities and rooms and timestamped data can then be correlated between multiple sources and feeds and compared and analyzed.

[0064] FIG. 6 is an illustration of a sample data plot from a room sensor 130 in a room analysis phase with the HVAC system engaged. As can be seen, a typical test cycle (1) where the temperature along they axis decreases with time gradually as in this case, there is a blending of outside air into the room to cool using energy efficient methods. Later, a precooling cycle (2) is initiated getting the building temperature down before the occupants (who generate heat) arrive and making the building comfortable. Finally, in (3) the normal thermostat driven cycles kick in as temperature rises to approximately 74 degrees followed by a decrease, caused by the HVAC equipment turning on and cooling. As the temperature approaches 70 and 71, it can be seen that the curve reverses and temperatures start to rise again as the HVAC equipment is cycled off. These are the typical cycles driven by an electronic thermostat driven HVAC system.

[0065] Referring now to FIG. 7 a functional flow diagram is provided for software running on a sensor 130. Upon initiating (1) the software will check whether or not a configuration exists (2). If not, the software will run a setup (3) routine, which could include prompting for the input of a Wi-Fi password (4) and then saving this configuration to flash memory (5) allowing for it to be used on the next start. Once saved, the software could go back to the start cycle (1).

[0066] If the configuration was detected in (2) then the software could then look for a hardware setup button being pressed (6) and if so would fall into setup mode (7). The setup button is one that is pushed and held during the reset sequence, often with a pin or a sharp tool to avoid going into setup mode by accident as this would cause the loss of configuration data.

[0067] Assuming that the configuration exists in (2) and the setup button is not depressed in (6), the room sensor software goes into its normal operating state for the intended purpose of monitoring and measuring environmental aspects of the room. The software loads the configuration (8) connects to Wi-Fi (9) and connects to the data collection and analysis software (10) which is depicted as ThingsBoard in this example.

[0068] One connected in (10), the software starts looping with a counter which is set to zero initially and subsequently incremented in (11). On each loop, the software reads the temperature sensor data in (12) and sends this data to the collection and analysis software (13) again depicted as ThingsBoard in this example. In FIG. 7, the counter is then compared to a fixed value (14) which has been set to five in the example flow. If less than, it means we have not taken five readings and we will loop back to (11) until having done so.

[0069] Once five readings have been obtained in (14) the software goes into a deep sleep (15) which is a battery saving function. In the example five minutes is used, however, one of skill in the art will recognize that virtually an interval can be configured and set as appropriate for the test scenario. The circuit comes out of deep sleep after the predetermined interval and goes back to the start (1) of the cycle. Note that the deep sleep will not wipe any of the configuration data, so the rerunning of setup would only be initiated by depressing the setup button on startup or reset.

[0070] FIG. 8 depicts a sample schematic diagram of an exemplary sensor 130. The processor 134 depicted here as an ESP8266-12E manufactured by Ai-Thinker and is wired with power circuit 131 driving the module through a power source of two AA batteries. A sample display 133 is shown to highlight results and complement the LEDs that are showed elsewhere in the schematic. A temperature sensor 132 is connected to the processor 134 and is used to gather the raw temperature data. Finally, a reset circuit 135 is shown which forces the module back into setup mode.

[0071] A discussion will now be presented with respect to the measurement and analysis of a room or space for determining an energy transfer rate of the space. In particular, when considering the thermal efficiency of a particular space or room there are a number of factors that have a direct correlation on the thermal efficiency of the room.

[0072] The room volume is a measure of how much air is in a particular space, and as the temperature varies in that space and the volume of air dissipates heat or gains heat as the case may be. Note that for the purposes of this description, cooling and heating will be discussed in the same manner and consideration will only be made of the temperature variation along with the functioning of the HVAC system to control and change the temperature in the space.

[0073] The surface area of the room, including the walls, floor and ceiling make up the envelope that contains the volume of air in the room. The temperature change is correlated to the amount of heat or air that passes through or is in contact with these surfaces. In such a scenario, two rooms of the same size can be compared with the rate at which they change temperature. The one that is better sealed or has walls made of more efficient materials will dissipate less heat than the other. Examples may include solariums or rooms with large windows which would allow more heat to escape than rooms with thick walls made of stone or brick.

[0074] The outside temperature and in particular the A (delta) between the inside and outside temperatures affects the amount of dissipation of heat in or out of the space that is being measured.

[0075] Additional variables can have an impact on thermal efficiency including sunlight, wind, humidity, and such. While these can be factored in and correlated, for simplification a static constant will be applied to differentiate between various classes of spaces. For example, a stand-alone building with all walls and ceiling exposed to the outside elements would be considered one class, while another space that is part of a larger building (e.g., a multi-story strip mall) may have only two walls exposed to the outside and would form a separate distinct class of building. Other distinct classifications include facilities that are inside shopping centers (e.g., a food court), and spaces with many windows or solarium type and open terraces. While it may be possible to accurately factor in each of these variables and types specifically, in most cases, results will be compared in the same space (before and after some renovation or change), or between two comparable spaces (where the external factors will play a similar role for spaces in the same class).

[0076] While the room size including the volume and surface area are constant and straight forward to measure, the temperature reading is an important variable that requires accurate and consistent measurement using both instrumentation and technique in placing such instrumentation to obtain consistent and unhampered test results for the space(s) in question.

[0077] In order to perform this assessment across an enterprise it would generally be necessary to have a group of connected temperature sensors distributed throughout an enterprise that will report time stamped temperature data to a centralized database. That data can be analyzed and assessed to determine the locations throughout the organization where the room envelope could benefit from additional energy performance improvements. Further, when making any updates that may affect energy performance, such a system can be used to measure and compare results to evaluate the effectiveness of these improvements with before and after values.

[0078] The sensors 130, 130, 130 that have been previously discussed would need to meet the following requirements: [0079] Wireless operationthe ability to transmit temperature information wirelessly via Wi-Fi network. The sensors should be capable of working with 802.11 b/g/n networks or equivalent. [0080] Real-time temperature updatesThe sensor should be capable of publishing temperature updates at intervals of 5 seconds or less. [0081] Battery operationThe sensor should be capable of operating for the length of a multi-day test and would ideally employ rechargeable batteries, or even incorporate solar charging capabilities. In some longer-term measurement applications, the operating time should reach 1 year or more. [0082] ConfigurableThe sensor should be configurable so that it may allow for different Wi-Fi SSIDs and network passwords as it is used in a variety of locations. The sensor should also accommodate the ability to add physical location details to the device configuration. [0083] Range and AccuracyThe accuracy of the temperature sensor should be accurate to +/0.5 C from 10 C to 85 C. [0084] Securitythe design of the sensor should prevent intrusion into the sensor network and any attempts to navigate through the network to other connected hosts should be prevented. As an option support for the WPA2 Enterprise wireless network security protocol or better should be available. [0085] Standalone operationthe sensor should also be equipped with an optional display that can show results of independent tests in the form of blinking multicolor LEDs to show status such as: test started, in progress, complete, error etc. Values can also be shown on the display. [0086] CapacityThe device must also employ a processor such as an ESP8266-12E system on chip (SoC) or equivalent and also include a temperature sensor capable of delivering real-time temperature readings such as a DS18620 single wire temperature sensor manufactured by Dallas Semiconductor.

[0087] The access point provides the Wi-Fi network connectivity for the sensor network. For this application, either the customer network can be used, or a temporary network can be brought in for the purpose of collecting data during the period of time when the room envelope integrity evaluation is underway.

[0088] A temporary network infrastructure to accommodate the network of IoT devices (room sensors) will simplify the process of deploying the network and gathering fine grained room level temperature data. A standalone cellular based router providing access to the devices and a laptop to gather the data can be used or the equivalent.

[0089] Data from the sensor is read and put into a table for subsequent analysis and display using a database and can be read by visualization software to deliver and display the results in an easy to read and see format. Analytics can be performed on the data using any number of analytics and predictive analytics platforms.

[0090] The following example table defines static data and time series sensor data used in preliminary testing:

TABLE-US-00001 TABLE 1 Static Data Data Element Name Description Remarks Building Address for Building Location Floor Floor of the building Room Location Location of the room Room ID Room identifier Unique identifier associated with a room Room Geo coordinates of the Coordinates room Room Type Type of room e.g., individual office, conference room, corridor, storage room, etc. Room exterior Number of exterior walls walls Room Interior Number of interior walls walls Room wall Description of the wall material material being used Room Ceiling The ceiling height of the Height room Room Ceiling The type of ceiling used Type in the room Room Floor They type of floor of the Type room Room Sq ft The square footage of the room Other Room Description of other room A basic description of the Attributes attributes room attributes, such as glass walls, open concept, etc. Outside Air Temperature of the outside Taken at the time of the Temp air temperature test Adjacent space Temperature in adjacent Taken at the time of the temperature spaces test -this may be an array of multiple temperature readings Ceiling Plenum Temperature in the air Taken at the time of the air temperature space above the ceiling test

[0091] The test process used is such that the sensors are placed in a location within the room that is temperature stable, for example, a location that is out of direct sunlight and away from surfaces that may conduct temperature. The sensor may, for example, be suspended from the ceiling using a small diameter wire so that the sensor remains at a height equidistant from the floor and ceiling in an area in the middle of the room.

[0092] The sensor should be placed in a location providing a reasonable representation of the average temperature of the room. Where possible, this placement must be consistent for multiple rooms when doing comparisons. i.e. distance from floor and ceiling and the distance from openings should be consistent across rooms.

[0093] In one configuration, the system may utilize a two-part testing approach as a means to gather the data necessary to assess the environment under test. Part one is a room envelope test, and this test attempts to eliminate the impact of the HVAC system from the room environment. The second part of the test is a room temperature monitoring test and will monitor the temperature of the room environment for anywhere between two and seven days. The first part of the test assesses the ability of the space to resist temperature change, the second part of the test will provide data to determine how well the HVAC system performs for that particular room location. Although both tests provide valuable data on their own, the combination of these two tests provides valuable insights into the performance of both the building envelope and HVAC system at the room level.

[0094] For the Room Envelope Test, once the sensor has been placed in the room and the temperature in the room has stabilized (this period of time depends on the size of the room, but for a 1010 office, the period of time should be about 15 to 20 minutes) the HVAC system will be disabled. Ideally the return air vent will be blocked, and the temperature sensor will be started. The computer will begin gathering data within 30 seconds and the sensor will be programmed to take a temperature reading every 5 minutes for the next hour.

[0095] In order to be minimally disruptive to the working environment, the duration of the test period for the Room Envelope test may be kept to one hour. It is possible to conduct other longer tests after working hours, but it is found that the test results are consistent between the shorter and longer tests and this is unnecessary in most cases. Cases where smaller variations in highly efficient rooms are to be measured may be an exception. After a field test of the room sensors a determination is made to decide whether a single one-hour test is sufficient for assessing the room envelope.

[0096] The Room Temperature Monitoring test is the second part of the test and is intended to monitor the temperature of the room over several days. Monitoring the temperature of the room 24 hours a day over a multi-day period will provide valuable insights into the ability of the HVAC system to maintain a comfortable room environment during periods of time when the room is occupied as well as identify potential problems related to the HVAC setbacks. Improperly configured setbacks can be a contributing major factor for excess energy consumption.

[0097] The time series data gathered by these tests is the data gathered by the individual temperature sensors. Although the ESP8266-12E/DS18620 temperature sensor used in the prototyping is capable of delivering a temperature reading per second, for the purpose of this analysis that data frequency is not believed to be necessary. In order to maximize battery life in the remote sensor, the temperature sensor is configured to deliver twelve (12) temperature readings per hour or one reading every five (5) minutes. This variation of sensor reading timing is simply an example, and should not be viewed as limiting. Data can be gathered in a variety of timing increments and generally speaking, the more frequently it is measured the more accurate and granular the results will be.

[0098] An example of the data reported at the sensor level is depicted in the following table:

TABLE-US-00002 TABLE 2 Data Element Name Description Sensor ID information Sensor ID to correlate with placement. Timestamp Timestamp for each measure Temp Temperature Humidity Percentage of humidity

[0099] The objective of the data analysis is to identify and isolate areas of the building that do not maintain temperature as well as others. The analysis will allow those poor performing areas to be targeted for building envelope improvements. The following outlines the process and lists the variables to be analyzed.

[0100] As a means for providing a consistent measure for the rate that a room warms or cools, the data gathered in the course of the testing can be used to gather the essential input data to calculate the cooling constant of the room. This cooling constant can be derived from Newtown's law of cooling that states that the rate of change of the temperature of an object is proportional to the difference between its own temperature and the ambient temperature (i.e., the temperature of its surroundings). By understanding the rate of change in each area being evaluated it is possible to produce an objective score that us useful for assessing the envelope properties of a room.

[0101] Simple Temperature over Time. The temperature sensor will gather 12 readings per hour in the default setting of five-minute data gathering windows. This data will be characterized in a table with the parameters listed in the example sensor data over time.

[0102] A thermal efficiency metric is determined using [0103] a. Temperature variation over time [0104] b. External temperature [0105] c. Volume of the room/space [0106] d. Surface area of the room/space

[0107] Mathematically, the Thermal Efficiency is calculated as follows:

[00001]$\mathrm{Thermal}.Math..Math.\mathrm{Efficiency}=\left\{\frac{20}{\mathrm{LN}.Math.\left\{\frac{\left(\mathrm{Inside}.Math..Math.\mathrm{Start}.Math..Math.\mathrm{Temperature}-\mathrm{Outside}.Math..Math.\mathrm{Temperature}\right)}{\left(\mathrm{Inside}.Math..Math.\mathrm{End}.Math..Math.\mathrm{Temperature}-\mathrm{Outside}.Math..Math.\mathrm{Temperature}\right)}\right\}}\right\}\frac{\mathrm{Volume}}{\mathrm{Surface}.Math..Math.\mathrm{Area}}$

*Note that a value of 20 is used to smooth out the values, however this is illustrative and depending on the application and target range this constant can be modified or omitted.

[0108] Although the invention has been described with reference to a particular arrangement of parts, features and the like, these are not intended to exhaust all possible arrangements or features, and indeed many other modifications and variations will be ascertainable to those of skill in the art.