FEED WATER SUPPLEMENTARY THERMAL EXCHANGE APPARATUS, SYSTEM AND METHOD

Abstract

A heat exchange system for transferring heat energy to control the temperature of a building comprising: a first heat exchanger having a first and second inlet and a first and second outlet wherein waste water flows through said first inlet of said first heat exchanger and out said first outlet while a water supply flows through said second inlet through said first heat exchanger and out said second outlet so as to transfer heat energy between said waste water and said water supply; and a second heat exchanger having a first and second inlet and a first and second outlet wherein domestic water flows through said first inlet, through said second heat exchanger and out said first outlet while said water supply from said second outlet of said first heat exchanger flows through said second inlet, through said second heat exchanger and out said second outlet so as to further transfer heat energy between said domestic water and said water supply from said second outlet of said second heat exchanger and control the temperature of said building.

Claims

1. Apparatus for transferring heat energy comprising: a first heat exchanger for transferring thermal energy between waste water fluid and a first fluid; a second heat exchanger connected to the first heat exchanger for transferring heat energy between the first fluid and a domestic water supply.

2. Apparatus as claimed in claim 1 wherein said waste water fluid is cooler than said first fluid so that said first heat exchanger cools said first fluid.

3. Apparatus as claimed in claim 2 wherein said domestic water supply is cooler than said cooled first fluid so that said second heat exchanger further cools said cooled first fluid.

4. Apparatus as claimed in claim 3 further including a heat pump connected to said first and second heat exchangers.

5. Apparatus as claimed in claim 4 wherein said first heat exchanger comprises a Huber Rowin heat exchanger having a first waste water inlet and a first waste water outlet and a second fluid inlet and a second fluid outlet wherein: waste water flows through said first waste water inlet to said first waste water outlet; while said first fluid flows through said second fluid inlet to said second fluid outlet for transferring heat energy between said waste water fluid and said first fluid.

6. Apparatus as claimed in claim 5 wherein said second heat exchanger comprises a plate frame heat exchanger.

7. A heat exchange system for transferring heat energy to control the temperature of a building comprising: a first heat exchanger having a first and second inlet and a first and second outlet wherein waste water flows through said first inlet of said first heat exchanger and out said first outlet while a water supply flows through said second inlet through said first heat exchanger and out said second outlet so as to transfer heat energy between said waste water and said water supply; a second heat exchanger having a first and second inlet and a first and second outlet wherein domestic water flows through said first inlet, through said second heat exchanger and out said first outlet while said water supply from said second outlet of said first heat exchanger flows through said second inlet, through said second heat exchanger and out said second outlet so as to further transfer heat energy between said domestic water and said water supply from said second outlet of said second heat exchanger and control the temperature of said building.

8. A heat exchange system as claimed in claim 7 further including valve means and pump means for selectively delivering at least a first circuit for cooling the temperature of said building wherein the temperature of said waste water is cooler than said water supply for cooling said water supply through said first heat exchanger, and for further cooling said water supply through said second heat exchanger so as to cool said building.

9. A heat exchange system as claimed in claim 7 wherein said valve means and pump means selectively deliver at least a second circuit for heating the temperature of said building wherein the temperature of said waste water is warmer than said water supply for heating said water supply through said first heat exchanger and said second heat exchanger is bypassed so as to heat said building.

10. A heat exchange system as claimed in claim 8 and 9 wherein said first heat exchanger comprises a Huber Rowin heat exchanger.

11. A heat exchange system as claimed in claim 10 wherein said second heat exchanger comprises a plate frame heat exchanger.

12. A heat exchange system as claimed in claim 11 further including temperature sensor for controlling the temperature of said building.

13. A heat exchange system as claimed in claim 12 wherein said building is selected from the group of hospital buildings, multi-unit residential buildings, office buildings and industrial facilities.

14. A method of controlling the temperature of a building comprising the steps of: (a) introducing waste water from a sewer into a first heat exchanger; (b) introducing a water supply into the first heat exchanger so as to transfer heat energy between said water supply and waste water so as to: i) produce thermally treated water supply, and ii) produce thermally treated waste water returned to the sewer; (c) introducing the thermally treated water supply to a second heat exchanger, (d) introducing domestic water into the second heat exchanger so as to transfer thermal energy between said thermally treated water supply and said domestic water so as to: i) produced a supplemented thermally treated water supply, and ii) produce thermally treated domestic water (e) introducing said thermally treated domestic water to said building; and (f) selectively returning said supplemented thermally treated water supply to a heat pump or said second heat exchanger.

15. A method of controlling the temperature of a building as claimed in claim 14 the first heat exchanger has a first and second inlet and a first and second outlet and said second heat exchanger has a first and second inlet and a first and second outlet, and: (a) wherein said waste water is introduced at said first inlet of said first heat exchanger at a first waste water temperature and exits said first outlet of said first heat exchanger as said thermally treated waste water at a second waste water temperature; and (b) said water supply is introduced at said second inlet of said first heat exchanger at a second inlet water supply temperature and exits said second outlet of said first heat exchanger as said thermally treated water supply at a second temperature; and (c) wherein said domestic water is introduced at said first inlet of said second heat exchanger at a first domestic water temperature and exists said first outlet of said second heat exchanger at a second domestic water temperature; and (d) said thermally treated water supply at said second temperature is introduced at said second inlet of said second heat exchanger and exits said second heat exchanger at a supplemented thermally treated water supply at a supplemented thermally treated water supply temperature.

16. A method of controlling the temperature of a building as claimed in claim 15 including the step of selectively diverting a portion of said domestic water at said first domestic water temperature between said first inlet of said second heat and said building.

17. A method of controlling the temperature of a building as claimed in claim 16 including sensing the temperature of said domestic water temperature at said second domestic water temperature to control the temperature at a selected level by activating a diverter valve to divert a portion of said domestic water at said first domestic water temperature between said first inlet of said second heat exchanger and said building.

18. A method of controlling the temperature of a building as claimed in claim 16 including the step of cooling the said building by selectively activating valve means and pump means to deliver a first circuit wherein: (i) said waste water at said first waste water temperature is lower than said second waste water temperature; (ii) said water supply at said second inlet temperature is higher than said thermally treated water supply at said second temperature; (iii) said domestic water at said first domestic water temperature is lower than said second domestic water temperature; (iv) said thermally treated water supply at said second temperature is higher than said supplemented thermally treated water supply.

19. A method of controlling the temperature of a building as claimed in claim 18 wherein a heat pump heats the water supply to said second inlet temperature.

20. A method of controlling the temperature of a building as claimed in claim 16 including the step of heating the said building by selectively activating valve means and pump means to deliver a second circuit wherein: the temperature of said waste water is warmer than said water supply for heating said water supply through said first heat exchanger and said second heat exchanger is bypassed so as to heat said building.

Description

IN THE DRAWINGS

[0028] FIG. 1 is a schematic drawing of one embodiment of the domestic feed water supplementary cooling system (DFSC) showing the first and second heat exchangers

[0029] FIG. 2 is another schematic drawing of one embodiment of the domestic feed water supplementary cooling system showing the first and second heat exchangers in a cooling circuit.

[0030] FIG. 3 is yet another schematic drawing of one embodiment of the domestic feed water supplementary cooling system showing the first and second heat exchangers where the second heat exchanger is in a bypass mode when heating or heating circuit.

DETAILED DESCRIPTION OF THE INVENTION

[0031] Like parts are given like numbers throughout the figures.

[0032] FIG. 1 generally illustrates a schematic drawing of the apparatus, system and method of this invention generally shown as 200. In particular the invention includes a first heat exchanger means 10, a second heat exchanger means 30, a heat pump 50 and a building 70.

[0033] Waste water 20 is pumped through the first heat exchanger 10 at the same time as a first fluid 22 is introduced through the first heat exchanger 10 to transfer thermal energy between the waste water 20 and the first fluid or water supply 22. Generally speaking the waste water 20 is used to reduce the temperature of the first fluid or water supply 22 as it passes through the first heat exchanger 10.

[0034] In one embodiment the first heat exchanger 10 can comprise a Huber Rowin (trademark) heat exchanger, although the invention comprises other types of first heat exchangers. A Huber Rowin heat exchanger can comprise an arrangement for reclaiming heat energy from wastewater associated with a sewer line, having an intermediate storage (not shown) connected to the sewer line (not shown) by means of at least one inlet 12 and having a heat exchanger 10 associated with the intermediate storage (not shown), the arrangement further comprising a pump device 11 associated with the intermediate storage (not shown) for transporting wastewater 20 into the heat exchanger 10, and the arrangement comprising a discharge 16 connected to the sewer line (not shown) and through which the wastewater 20 can flow back into the sewer line (not shown) after passing through the heat exchanger 10. The Huber Rowin (trademark) heat exchanger can have the inlet 12 comprising a filter device (not shown) having a cleaning device, characterized in that the cleaning device (not shown) comprises a conveyor screw (not shown) but described and illustrated in EP1970660B1.

[0035] The first heat exchanger 10 has a first inlet 12, a second inlet 14, a first outlet 16 and a second outlet 18. Waste water 20 is pumped through pump 11 to first heat exchanger 10 through first heat exchanger inlet 12 through the first heat exchanger 10 and out the first heat exchanger outlet 16. The waste water at the first heat exchanger first inlet 12 is at a first waste water temperature 13, and exits the first heat exchanger first outlet 16 at a second waste water temperature 17.

[0036] In one embodiment the waste water 20 at the first heat exchanger inlet 12 is at a first waste water inlet temperature 13 that is lower that the waste water temperature at the first heat exchanger outlet temperature 17.

[0037] Generally speaking the heat pump shown in FIG. 1 is connected to a building. The heat pump has a first circuit where chilled water is supplied to a building 70 through the evaporator side so as to extract heat from the building. In one example the heat pump supplies chilled water at for example 5.6 degrees centigrade and is returned at 12.2 degrees centigrade. This is by way of example only, where the heat pump is used in a cooling circuit to be described herein. The heat pump also has a second circuit where hot water is supplied to a building 70 through the condenser loop where for example hot water is supplied to the building at 50-60 degrees centigrade and returned 40-50 degrees centigrade. This is by way of example only where the heat pump is used in a heating circuit to be described herein

[0038] A heat pump 50 can be used for drawing heat energy from a building 70. In one embodiment the heat pump 50 is connected to the building 70 through the evaporator loop as previously described so as to deliver a first fluid 22 at a first fluid inlet 14 temperature 15. Once the first fluid or water supply passes through the second inlet 14 of the first heat exchanger 10 it exits the first heat exchanger 10 at the second outlet 18 at a thermally treated first water supply (or first fluid) temperature 19.

[0039] In one embodiment the water supply or first fluid 22 at the first heat exchanger second inlet 14 is at a first water supply temperature 15 that is higher that the thermally treated first water supply (or first fluid) at the first heat exchanger 10 second outlet 18 temperature 19.

[0040] The apparatus, system and method of this invention includes a second heat exchanger means 30 having a first inlet 32, a first outlet 38 and a second inlet 36 and a second outlet 34.

[0041] A domestic water supply 40 is introduced at the first inlet 32 of the second heat exchanger means 30 at a first domestic water temperature 33, through the second heat exchanger means 30 and exits the first outlet 38 of the second heat exchanger means 30 at a second domestic water temperature 39. At the same time in one embodiment the thermally treated water supply 18 at the thermally treated water supply temperature 19 is introduced at the second inlet 36 at temperature 37 and exits the second heat exchanger 30 at the second outlet 34 as a supplemented thermally treated water supply at a supplemented thermally treated temperature 35.

[0042] Generally speaking the thermally treated first water supply (or first fluid) temperature 19 is the same as temperature 37 or close thereto as there could be some slight temperature change due to the length of travel between outlet 18 and inlet 36.

[0043] The second heat exchanger 30 in one embodiment comprises a plate frame heat exchanger, although the invention comprises other typical heat exchangers as described herein having domestic feed water supplementary cooling systems. Generally speaking the supplemented thermally treated water supply at the second outlet of the second heat exchanger is at supplemented thermally treated temperature 35. In one embodiment the supplemented thermally treated temperature 35 is lower than the thermally treated water supply temperature 19 that is introduced at the second inlet 36 at temperature 37. In other words it is cooled.

[0044] The apparatus and system includes the fluid conduits shown as well as the valves 1, 2,3,4,5,6,7 shown. The apparatus and system also includes the pumps 11, 80, 82 and 84.

[0045] FIG. 2 generally describes the system and method of FIG. 1 in a cooling mode where the system and method are operated in a first circuit. The apparatus and system comprise of the components as shown in FIG. 1 where valves 7 are open and valves 2,3, and 5 are normally open and valve 1 is normally closed. Valve 4 (for example a 3 way diverter valve) is operated based on the suitable domestic supply temperature to the building. In particular the embodiment shown in FIG. 2 includes a temperature sensor T connected to the valve 4. The temperature sensor T may be selected to control the temperature of the blended domestic water supply that is actually supplied to the building. For example cold water being supplied to the building should generally not be above 15 degrees centigrade as bacteria and other pathogens develop at warmer temperatures. Furthermore many people do not enjoy drinking water above 15 degrees centigrade. Accordingly if temperature sensor T senses an elevated temperature of the blended temperature approaching a selected level such as 15 degrees centigrade the valve 4 diverts a portion of the domestic water from the city to blend with the supplemental thermally treated water supply 38 at temperature 39 so as to reduce the temperature of the domestic water supply 40.

[0046] The diverter valve 4 can divert anywhere from greater than zero to 100 percent of the domestic water 40 to second heat exchanger 30.

[0047] FIG. 2 illustrates a method of controlling or cooling the temperature of a building 70 by selectively activating valves 2,3,5 and 7 in an open position (normally open position NO) valve 1 is in a closed (normally closed position NC) and valve 4 is operated based on a suitable domestic supply temperature to the building 70 as described above through temperature sensor T, so that the pumps 11, 80, and 82 with the valves are activated to define a first circuit (or cooling circuit to the building 70) wherein: [0048] (i) the waste water 20 at said first waste water temperature 13 is lower than said second waste water temperature 17; [0049] (ii) said water supply at said second inlet temperature 15 is higher than said thermally treated water supply at said second temperature 19; [0050] (iii) said domestic water at said first domestic water temperature 32 is lower than said second domestic water temperature 39; [0051] (iv) said thermally treated water supply at said second temperature 37 is higher than said supplemented thermally treated water supply temperature 35.

[0052] By way of example only: [0053] temperature 13 can be in the range of 5-15 degrees centigrade; [0054] temperature 17 can be in the range of 10-20 degrees centigrade; [0055] temperature 15 can be in the range of 35-40 degrees centigrade; [0056] temperature 19 can be in the range of 25-30 degrees centigrade; [0057] temperature 37 can be in the range of 25-30 degrees centigrade; [0058] temperature 39 can be in the range of 15-20 degrees centigrade; [0059] temperature 33 can be in the range of 4-8 degrees centigrade; [0060] temperature 35 can be in the range of 15-20 degrees centigrade [0061] the domestic water from the city can be in the range of 4-8 degrees centigrade; the domestic water supply to the building can be 8-15 degrees centigrade.

[0062] In the cooling mode of FIG. 2 the valves 7 are open and the valves 6 (shown in FIG. 1 are closed. The temperature ranges described above are for illustration purposes only and the actual temperatures may change based on the domestic feed water supplementary cooling system sizing. Furthermore the domestic feed water supplementary cooling system is only in operation during the cooling mode.

[0063] In the heating mode illustrated in FIG. 3 the valves and pumps are selectively activated to deliver a second circuit wherein the temperature of the waste water is warmer than the water supply for heating the water supply through the first heat exchanger and the second heat exchanger 30 is bypassed so as to heat the building 70.

[0064] FIG. 3 generally illustrates the heating circuit where the domestic feed water supplementary cooling system is in by-pass operation and valve 1 is open valves 2,3 and 5 are closed and valve 4 is locked in by pass mode.