CA1162917A - System for recovering heat from a first liquid and using it to heat second liquid - Google Patents
System for recovering heat from a first liquid and using it to heat second liquidInfo
- Publication number
- CA1162917A CA1162917A CA000422836A CA422836A CA1162917A CA 1162917 A CA1162917 A CA 1162917A CA 000422836 A CA000422836 A CA 000422836A CA 422836 A CA422836 A CA 422836A CA 1162917 A CA1162917 A CA 1162917A
- Authority
- CA
- Canada
- Prior art keywords
- tank
- liquid
- outlet
- inlet
- heat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D17/00—Domestic hot-water supply systems
- F24D17/02—Domestic hot-water supply systems using heat pumps
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A system holds waste or process water (or other liquid) that possesses readily recoverabl heat, removes the heat by means of a heat pump and transfers it to another liquid, e.g., water to be heated for domestic use. The holding tank is shaped to permit it to be cleaned readily periodically, and thermal stratification in the tank containing the liquid being heated is promoted by a separator plate.
A system holds waste or process water (or other liquid) that possesses readily recoverabl heat, removes the heat by means of a heat pump and transfers it to another liquid, e.g., water to be heated for domestic use. The holding tank is shaped to permit it to be cleaned readily periodically, and thermal stratification in the tank containing the liquid being heated is promoted by a separator plate.
Description
SYSTEM FOR RECOVEP~ING HEAT FROM A FI~ST
_ _ _ . _ _ LIQUID AND IJS ING IT TO HEAT A SECOND LIQUID
BACKGROUND OF THE INVENTION
~ t the present time it is not common practice to recover the heat that is pxesent in domestic waste hot water. Hot water from bath tubs, showers and sinks simply is sewered resulting in a great deal of recoverable energy literally "going down the drain". In accordance wi-th this invention, there is provided a system for the recovery of this energy. While the system will be hereinafter described as one in which heat is recovered ~rom waste water in a house and used to heat water for domestic operations, it is to be understood that this is exemplary only. The liquid containing heat to be recovered may be other than water and may be derived from other than a domestic operation. For example, it may be industrial liquid waste. Likewise, the liquid to be heated may be other than water and may be for other than domestic use. However, the system hereinafter described was conceived for use in a domestic environment for recovering heat from waste water and using the same to heat water, and the invention thus will be so described~
SUMMARY OF THE INVENTION
Various aspec-ts of this invention are as follows:
_ _ _ . _ _ LIQUID AND IJS ING IT TO HEAT A SECOND LIQUID
BACKGROUND OF THE INVENTION
~ t the present time it is not common practice to recover the heat that is pxesent in domestic waste hot water. Hot water from bath tubs, showers and sinks simply is sewered resulting in a great deal of recoverable energy literally "going down the drain". In accordance wi-th this invention, there is provided a system for the recovery of this energy. While the system will be hereinafter described as one in which heat is recovered ~rom waste water in a house and used to heat water for domestic operations, it is to be understood that this is exemplary only. The liquid containing heat to be recovered may be other than water and may be derived from other than a domestic operation. For example, it may be industrial liquid waste. Likewise, the liquid to be heated may be other than water and may be for other than domestic use. However, the system hereinafter described was conceived for use in a domestic environment for recovering heat from waste water and using the same to heat water, and the invention thus will be so described~
SUMMARY OF THE INVENTION
Various aspec-ts of this invention are as follows:
2~ ~ ~
A system for recovering heat from a first liquid and using the heat recovered to heat a second liquid comprising: a first storage tank for said first liquid, said first tank having a top, a bottom and side walls, an overflow weir located within said first tank adjacent said top thereof, a first outlet from said first tank for said first liquid, said first outlet being located nearer said top than said bottom of said first tank but below the level of said overflow weix, a riser channel connecting said first outlet and a part of said first tank adjacent said bottom thereof in liquid-flow relationship to permit relatively cold first liquid at the bottom of said first tank to be displaced and to discharge from said first tank via said first outlet upon introduction of frech first lîquid intc said first tank, means for introducing said first liquid into said first tank via a first inlet at a location above said botto~ of said first tank but below the level of said first liquid established in said first tank b~7 said first outlet, a second outlet from said first tank for said first liquid and a second inlet i.nto said first tank for said first liquid, said seccnd outlet being clGser to said top than to said bottom of said first tank and said second inlet being closer to said bottom than said top of said first tank; a second storage tank for said second liquid, said second tank having a top, a bottom and side walls, means including a first inlet for introducing said second liquid to be heated into said second tank adjacent said bottom thereof, ~lectrical heating means for heating said second liquid located in the upper part of said second tank, a first outlet from said second tank for said second liquid, and a second inlet into ~aid second tank 1 g. ~
for said second liquid, said second inlet being located below said electrical heating means and above said first outlet, sa.id first outlet being located between said second inlet and said bottom of said second tank, a second outlet from said second tank for said second liquid, said second outlet being located above said electrical heating means, and means for assisting the thermal stratificaticn of said second liquid in said second tank, the last-mentioned means comprising a separator located within said second tank below said electrical heating means and above said second inlet of said second tank, said separator inhibiting substantial movement of said second liquid from below said separator to above said separator but permitting a sufficient flow of said second liquid from said second tank via said second outlet of said second tank in response to demand;
and a heat pump including a condenser and an evaporator, means for circulating said first liquid from said first tank via said secolld outlet of said first tank in heat exchange relationship with said evapora~or and back to said first tank via said second inlet of said first tank, whereby heat in said first liquid so circulated is given up to a heat exchange fluid in said evaporator, and means for circulating said second liquid from said second tank via said first outlet of said second tan~ in heat exchange relationship with said condenser and back to said second tank via said second inlet of said second tank, whereby heat in said heat exchange fluid in said condenser is given up to said second liquid.
A system for recovering heat from a first liquid and using the heat recovered to heat a second liquid comprising: a first storage tank for said first liquid, said first tank having a top, a bottom and side walls, an overflow weir located within said first tank adjacent said top thereof, a first outlet from said first tank for said first liquid, said first outlet being located nearer said top than said bottom of said first tank but below the level of said overflow weix, a riser channel connecting said first outlet and a part of said first tank adjacent said bottom thereof in liquid-flow relationship to permit relatively cold first liquid at the bottom of said first tank to be displaced and to discharge from said first tank via said first outlet upon introduction of frech first lîquid intc said first tank, means for introducing said first liquid into said first tank via a first inlet at a location above said botto~ of said first tank but below the level of said first liquid established in said first tank b~7 said first outlet, a second outlet from said first tank for said first liquid and a second inlet i.nto said first tank for said first liquid, said seccnd outlet being clGser to said top than to said bottom of said first tank and said second inlet being closer to said bottom than said top of said first tank; a second storage tank for said second liquid, said second tank having a top, a bottom and side walls, means including a first inlet for introducing said second liquid to be heated into said second tank adjacent said bottom thereof, ~lectrical heating means for heating said second liquid located in the upper part of said second tank, a first outlet from said second tank for said second liquid, and a second inlet into ~aid second tank 1 g. ~
for said second liquid, said second inlet being located below said electrical heating means and above said first outlet, sa.id first outlet being located between said second inlet and said bottom of said second tank, a second outlet from said second tank for said second liquid, said second outlet being located above said electrical heating means, and means for assisting the thermal stratificaticn of said second liquid in said second tank, the last-mentioned means comprising a separator located within said second tank below said electrical heating means and above said second inlet of said second tank, said separator inhibiting substantial movement of said second liquid from below said separator to above said separator but permitting a sufficient flow of said second liquid from said second tank via said second outlet of said second tank in response to demand;
and a heat pump including a condenser and an evaporator, means for circulating said first liquid from said first tank via said secolld outlet of said first tank in heat exchange relationship with said evapora~or and back to said first tank via said second inlet of said first tank, whereby heat in said first liquid so circulated is given up to a heat exchange fluid in said evaporator, and means for circulating said second liquid from said second tank via said first outlet of said second tan~ in heat exchange relationship with said condenser and back to said second tank via said second inlet of said second tank, whereby heat in said heat exchange fluid in said condenser is given up to said second liquid.
3 ~ ~
4/5 A storage tank 'or liquid, said tank having a top, a bottom and side walls, means including a first inlet for introducing liquid to be heated into said tank adjacent said bottom thereof, electrical heating means for heating said liquid located in the upper part of said tank, a first outlet from said tank for said liquid, a second inlet into said tank for said liquid, said second inlet being located below said electrical heating means and above said first outlet, said first outlet being located between said second inlet and said bottom of said tank r a second outlet from said tank for said liquid, said second outlet being located above said electrical heating means, and means for assisting the thermal - stratification of said liquid in said tank, the last-mentioned means comprising a separator located within said tank below said electrical heating means and above said second inlet, said se~arator inhibitiny substantial r.lcvemert or liquid frcm below said separator to above said separator but permitting a sufficient flow of liquid from said tank via said second outlet in respcnse to demand.
g ~ 7 BRIEF DESCRIPTION OF THE DRAWI~GS
.. . ... _ _ This invention will become more apparent from the following detailed description, taken in conjunction with the appended drawing, which i5 a schematic representation of a complete waste water recovery and utilization system constituting an aspect of this invention.
DETAILED DESCRIPTION OF THE INVENTION INCLUDING
THE PR~FERRED EMBODIMENT
Referring to the drawing, the system is composed of a waste water holding tank 10, a heat pump 11, a hot water tank 12 and various controls including controls l3.
Tank 10, which should be well thermally insulated (thermal insulation not shown) and appropriately constructed to resist corrosion, has a top 14, a kottom 15 and side walls 16. The tank is generally cylindrical in cross-section, but adjacent top 14 side walls 16 slope inwardly, as seen at 17, for a purpose that will be outlined in greater detail hereafter.
An outlet 18 is located in bottom 15 of tank 10, it being noted that bottom 15 is of conical configuration sloping towards outlet 18 so that all of the water in tank 10 can be drained therefrom via outlet 18. A valve 19 for opening and closing outlet 18 is provided.
Within tank 10 is an overflow weir 20. It is located ad~acent top 14 and, in an emergency, functions to permit excess water in tank 10 to overflow from the tank and to discharge to waste via a waste pipe 21.
9 ~ ~
There is a second outlet 22 for water in tank lO. It is located nearer top l~ than bottom 15 but helow the level of overflow weir 20 and is connected in liquid-flow relationshlp with the lower part of tank 10 via a riser channel 23. In this manner relatively cold water fron~ the lower part of tank lO can be displaced by waste water entering the tank. The displaced water overflows from outlet 22 and discharges into waste pipe 21. It will be seen than the level of outlet 22 determines the level 24 of water in tank 10. Riser channel 23 preferably is thermally insulated from waste water in tank 10 by thermal insulation 25. This also may be accomplished by making riser channel 23 a separate , pipe that is kept well away from side wall 16 of tank lO.
15Waste water is introduced into tank 10 from a pipe 26 via an inlet 27. Inlet 27 preferably is located at a point about /3 of the depth of tank lO. It must be noted, in this connection, that the waste water introduced into tank lO is not always hot. For example, if cold water were being run in a sink, the waste water going into tank 10 would be cold. Therefore the location of inlet 27 relative to thermal stratification within tank 10 must take this into consideration.
An outlet 28 and an inlet 29 for waste water r~ 25 from tank 10 that is recirculated are provided in side wall 16, the former being closer to the top of tank lO
(where the water is hotter) and the latter being closer to the bo~tom of tank lO (where the water is colder).
A rinsing device 30, which may be like the 30 rotating arm of a dishwasher or a tubular ring provided with spaced apart openings therearound through which water can spray, is provided for rinsing the interior surface of tank lO. It is arranged so as to direct its spray against inwardly sloping section 17 and weir 20, 35 these components being at substantially the same level, namely the level 24 of water in tank 10. Because of this, scum and solid waste material accumulate thereon, and the inward slope of section 17 and weir 20 assists in J
the removal of such scum by the rinsing action and under the influence of gravity.
Hot water tank 12 also is cylindrical in cross-section, should be thermally well insulated and should be constructed to be corrosion resistant. It has a top 30, bottom 31 and side walls 32. Water to be heated is introduced, e.g., from city mains, from a pipe 33 via an inlet 34 located adjacent bottom 31 (the coldest water always should be introduced into the lowest point of a hot water tank).
A conventional electrical resistance heater 35 is located in the upper part of tank 12 along with a thermostat 35a that controls the supply of power to heater 35.
In the lower part of tank 12 there are provided an outlet 36 and an inlet 37, the latter being located below heater 35, and above outlet 36 and preferably about one-half way along the depth of the lower part of tank 12, the former being located adjacent bottom 31. A
thermostat 39 also is provided.
~ n outlet 40 for hot water frcm tank 10 is provided in top 30 above heater 35.
A sacrificial corrosion anode 60 is provided, as is conventional, to reduce corrosive attack on the c- 25 tank welds or any other exposed metal surfaces.
~ An important feature o~ tank 12 is the provision of a separator 61 that- assists in the thermal stratification of the water in tank 12. Separator 61, which may be a circular plate that spring fits into 30 glazed over lugs 62 on the inner wall of tank 12, is located below heater 35 and well above inlet 37.
Separator 61 divides tank 12 into an upper resistance heater section and a lower preheater section and prevents bulk circulation between the two sections. However, it 35 is provided with a small opening 63 suf~icient to permit water to flow from the lower section to the upper section and out of tank 12 via outlet 40 in response to demand.
Heat pump 11 is essentially conventional in nature and includes a compressor 41, condenser 42 and --- J ~62~7 g evaporator 43. Refrigerant vapour from compressor 41 flows past a manual-reset high pressure circuit breaker 44 into condenser 42. Condensed refrlgerant exits condenser 42 and flows through a liquid line filter-drier 45 and a thermostatic controi valve 46. Now at reduced pressure, the refrigerant traverses evaporator 43 and the refrigerant vapour from evaporator 43 is returned to compressor 41 via an optional low pressure cut-out 47.
A dual head magnetically driven purnp employing one head 48 to circulate waste water from tank 10 over evaporator 43 in heat exchange relationship therewith and the other head 49 to circulate water f`rom tank 12 to be heated over condenser 42 in heat exchange relationship therewith is provided. With this arrangement the w~ter '~ 15 in each pump head is isolated from the motor by magnetic coupling, and hence the waters are ,isolated and cannot contaminate each other.
Optionally, the condensing refrigerant in condenser 42 may be isolated from the water being heated by a double-walled con~enser optional]y 'having an indicator dye between the double walls. The indicator dye would colour the hot water in the event of a rupture in the dye/water interface indicating possible contamination of the hot water by the refrigerant.
( 25 In operation, waste water flows into tank 10 -'` via pipe 26 and inlet 27 displasing cold water from the bottom of tank 10 via riser channel 23, outlet 22 and waste pipe 21. In the event that channel 23 should become plugged or should be unable to accommodate the 30 volume of water being displaced by waste, water coming into tank 10, overflow over weir 20 will occur, but operation in this mode is not desirable, of course, since the hottest water in tank 10 will be at the top of the tank.
Water from tank 10, if sufficiently warm, is circulated by pump 48 and gives up heat to the refrigerant in evaporator 43, the warmest water from the top of tank 10 being used for this purpose. The resulting cold water is returned to tank 10 via lower lo ~ ~29l7 inlet 29, which is below inlet 27. The extracted heat from this water is transferred in condenser 42 to water from tank 12 being circulated by pump 49. In this manner the water in the lower (preheater) section of tank 12 is heated to a temperature that is determined by the setting of thermostat 39. This thermostat usually will be set to the same temperature, e.g., 130F, as that of thermostat 35a. When the desired temperature is reached, thermostat 39 inhibits operation of heat pump 11.
Turning now to the controls, a timing device 70 controls the opening and closing of valve 19 by operation of a valve actuator 71 and holds valve 19 open until the entire contents of tank 10 have drained followed by an f automated spray rinse controlled by a controller 72.
15 Valve 19 is closed by timing device 70 and actuator 71 after the rinse water has drained away. As previously noted, the hot water rinse removes surface rim and bottom deposits from the interior of tank 10 prevent their accumulation.
A level sensor 73 inhibits operation of heat pump 11 if tank 10 is not full, while a th~rmostatic control 74 shuts off heat pump 11 if the surface waste water is too cool for worthwhile heat recovery.
While preferred embodiments of the invention have been disclosed herein, those skilled in the art will appreciate that changes and modifications may be made therein without departing from the spirit and scope of this invention as defined in the appended claims.
g ~ 7 BRIEF DESCRIPTION OF THE DRAWI~GS
.. . ... _ _ This invention will become more apparent from the following detailed description, taken in conjunction with the appended drawing, which i5 a schematic representation of a complete waste water recovery and utilization system constituting an aspect of this invention.
DETAILED DESCRIPTION OF THE INVENTION INCLUDING
THE PR~FERRED EMBODIMENT
Referring to the drawing, the system is composed of a waste water holding tank 10, a heat pump 11, a hot water tank 12 and various controls including controls l3.
Tank 10, which should be well thermally insulated (thermal insulation not shown) and appropriately constructed to resist corrosion, has a top 14, a kottom 15 and side walls 16. The tank is generally cylindrical in cross-section, but adjacent top 14 side walls 16 slope inwardly, as seen at 17, for a purpose that will be outlined in greater detail hereafter.
An outlet 18 is located in bottom 15 of tank 10, it being noted that bottom 15 is of conical configuration sloping towards outlet 18 so that all of the water in tank 10 can be drained therefrom via outlet 18. A valve 19 for opening and closing outlet 18 is provided.
Within tank 10 is an overflow weir 20. It is located ad~acent top 14 and, in an emergency, functions to permit excess water in tank 10 to overflow from the tank and to discharge to waste via a waste pipe 21.
9 ~ ~
There is a second outlet 22 for water in tank lO. It is located nearer top l~ than bottom 15 but helow the level of overflow weir 20 and is connected in liquid-flow relationshlp with the lower part of tank 10 via a riser channel 23. In this manner relatively cold water fron~ the lower part of tank lO can be displaced by waste water entering the tank. The displaced water overflows from outlet 22 and discharges into waste pipe 21. It will be seen than the level of outlet 22 determines the level 24 of water in tank 10. Riser channel 23 preferably is thermally insulated from waste water in tank 10 by thermal insulation 25. This also may be accomplished by making riser channel 23 a separate , pipe that is kept well away from side wall 16 of tank lO.
15Waste water is introduced into tank 10 from a pipe 26 via an inlet 27. Inlet 27 preferably is located at a point about /3 of the depth of tank lO. It must be noted, in this connection, that the waste water introduced into tank lO is not always hot. For example, if cold water were being run in a sink, the waste water going into tank 10 would be cold. Therefore the location of inlet 27 relative to thermal stratification within tank 10 must take this into consideration.
An outlet 28 and an inlet 29 for waste water r~ 25 from tank 10 that is recirculated are provided in side wall 16, the former being closer to the top of tank lO
(where the water is hotter) and the latter being closer to the bo~tom of tank lO (where the water is colder).
A rinsing device 30, which may be like the 30 rotating arm of a dishwasher or a tubular ring provided with spaced apart openings therearound through which water can spray, is provided for rinsing the interior surface of tank lO. It is arranged so as to direct its spray against inwardly sloping section 17 and weir 20, 35 these components being at substantially the same level, namely the level 24 of water in tank 10. Because of this, scum and solid waste material accumulate thereon, and the inward slope of section 17 and weir 20 assists in J
the removal of such scum by the rinsing action and under the influence of gravity.
Hot water tank 12 also is cylindrical in cross-section, should be thermally well insulated and should be constructed to be corrosion resistant. It has a top 30, bottom 31 and side walls 32. Water to be heated is introduced, e.g., from city mains, from a pipe 33 via an inlet 34 located adjacent bottom 31 (the coldest water always should be introduced into the lowest point of a hot water tank).
A conventional electrical resistance heater 35 is located in the upper part of tank 12 along with a thermostat 35a that controls the supply of power to heater 35.
In the lower part of tank 12 there are provided an outlet 36 and an inlet 37, the latter being located below heater 35, and above outlet 36 and preferably about one-half way along the depth of the lower part of tank 12, the former being located adjacent bottom 31. A
thermostat 39 also is provided.
~ n outlet 40 for hot water frcm tank 10 is provided in top 30 above heater 35.
A sacrificial corrosion anode 60 is provided, as is conventional, to reduce corrosive attack on the c- 25 tank welds or any other exposed metal surfaces.
~ An important feature o~ tank 12 is the provision of a separator 61 that- assists in the thermal stratification of the water in tank 12. Separator 61, which may be a circular plate that spring fits into 30 glazed over lugs 62 on the inner wall of tank 12, is located below heater 35 and well above inlet 37.
Separator 61 divides tank 12 into an upper resistance heater section and a lower preheater section and prevents bulk circulation between the two sections. However, it 35 is provided with a small opening 63 suf~icient to permit water to flow from the lower section to the upper section and out of tank 12 via outlet 40 in response to demand.
Heat pump 11 is essentially conventional in nature and includes a compressor 41, condenser 42 and --- J ~62~7 g evaporator 43. Refrigerant vapour from compressor 41 flows past a manual-reset high pressure circuit breaker 44 into condenser 42. Condensed refrlgerant exits condenser 42 and flows through a liquid line filter-drier 45 and a thermostatic controi valve 46. Now at reduced pressure, the refrigerant traverses evaporator 43 and the refrigerant vapour from evaporator 43 is returned to compressor 41 via an optional low pressure cut-out 47.
A dual head magnetically driven purnp employing one head 48 to circulate waste water from tank 10 over evaporator 43 in heat exchange relationship therewith and the other head 49 to circulate water f`rom tank 12 to be heated over condenser 42 in heat exchange relationship therewith is provided. With this arrangement the w~ter '~ 15 in each pump head is isolated from the motor by magnetic coupling, and hence the waters are ,isolated and cannot contaminate each other.
Optionally, the condensing refrigerant in condenser 42 may be isolated from the water being heated by a double-walled con~enser optional]y 'having an indicator dye between the double walls. The indicator dye would colour the hot water in the event of a rupture in the dye/water interface indicating possible contamination of the hot water by the refrigerant.
( 25 In operation, waste water flows into tank 10 -'` via pipe 26 and inlet 27 displasing cold water from the bottom of tank 10 via riser channel 23, outlet 22 and waste pipe 21. In the event that channel 23 should become plugged or should be unable to accommodate the 30 volume of water being displaced by waste, water coming into tank 10, overflow over weir 20 will occur, but operation in this mode is not desirable, of course, since the hottest water in tank 10 will be at the top of the tank.
Water from tank 10, if sufficiently warm, is circulated by pump 48 and gives up heat to the refrigerant in evaporator 43, the warmest water from the top of tank 10 being used for this purpose. The resulting cold water is returned to tank 10 via lower lo ~ ~29l7 inlet 29, which is below inlet 27. The extracted heat from this water is transferred in condenser 42 to water from tank 12 being circulated by pump 49. In this manner the water in the lower (preheater) section of tank 12 is heated to a temperature that is determined by the setting of thermostat 39. This thermostat usually will be set to the same temperature, e.g., 130F, as that of thermostat 35a. When the desired temperature is reached, thermostat 39 inhibits operation of heat pump 11.
Turning now to the controls, a timing device 70 controls the opening and closing of valve 19 by operation of a valve actuator 71 and holds valve 19 open until the entire contents of tank 10 have drained followed by an f automated spray rinse controlled by a controller 72.
15 Valve 19 is closed by timing device 70 and actuator 71 after the rinse water has drained away. As previously noted, the hot water rinse removes surface rim and bottom deposits from the interior of tank 10 prevent their accumulation.
A level sensor 73 inhibits operation of heat pump 11 if tank 10 is not full, while a th~rmostatic control 74 shuts off heat pump 11 if the surface waste water is too cool for worthwhile heat recovery.
While preferred embodiments of the invention have been disclosed herein, those skilled in the art will appreciate that changes and modifications may be made therein without departing from the spirit and scope of this invention as defined in the appended claims.
Claims (6)
1. A system for recovering heat from a first liquid and using the heat recovered to heat a second liquid comprising: a first storage tank for said first liquid, said first tank having a top, a bottom and side walls, an overflow weir located within said first tank adjacent said top thereof, a first outlet from said first tank for said first liquid, said first outlet being located nearer said top than said bottom of said first tank but below the level of said overflow weir, a riser channel connecting said first outlet and a part of said first tank adjacent said bottom thereof in liquid-flow relationship to permit relatively cold first liquid at the bottom of said first tank to be displaced and to discharge from said first tank via said first outlet upon introduction of fresh first liquid into said first tank, means for introducing said first liquid into said first tank via a first inlet at a location above said bottom of said first tank but below the level of said first liquid established in said first tank by said first outlet, a second outlet from said first tank for said first liquid and a second inlet into said first tank for said first liquid, said second outlet being closer to said top than to said bottom of said first tank and said second inlet being closer to said bottom than said top of said first tank; a second storage tank for said second liquid, said second tank having a top, a bottom and side walls, means including a first inlet for introducing said second liquid to be heated into said second tank adjacent said bottom thereof, electrical heating means for heating said second liquid located in the upper part of said second tank, a first outlet from said second tank for said second liquid, and a second inlet into said second tank .11.
for said second liquid, said second inlet being located below said electrical heating means and above said first outlet, said first outlet being located between said second inlet and said bottom of said second tank., a second outlet from said second tank for said second liquid, said second outlet being located above said electrical heating means, and means for assisting the thermal stratification of said second liquid in said second tank, the last-mentioned means comprising a separator located within said second tank below said electrical heating means and above said second inlet of said second tank, said separator inhibiting substantial movement of said second liquid from below said separator to above said separator but permitting a sufficient flow of said second liquid from said second tank via said second outlet of said second tank in response to demand;
and a heat pump including a condenser and an evaporator, means for circulating said first liquid from said first tank via said second outlet of said first tank in heat exchange relationship with said evaporator and back to said first tank via said second inlet of said first tank, whereby heat in said first liquid so circulated is given up to a heat exchange fluid in said evaporator, and means for circulating said second liquid from said second tank via said first outlet of said second tank in heat exchange relationship with said condenser and back to said second tank via said second inlet of said second tank, whereby heat in said heat exchange fluid in said condenser is given up to said second liquid.
for said second liquid, said second inlet being located below said electrical heating means and above said first outlet, said first outlet being located between said second inlet and said bottom of said second tank., a second outlet from said second tank for said second liquid, said second outlet being located above said electrical heating means, and means for assisting the thermal stratification of said second liquid in said second tank, the last-mentioned means comprising a separator located within said second tank below said electrical heating means and above said second inlet of said second tank, said separator inhibiting substantial movement of said second liquid from below said separator to above said separator but permitting a sufficient flow of said second liquid from said second tank via said second outlet of said second tank in response to demand;
and a heat pump including a condenser and an evaporator, means for circulating said first liquid from said first tank via said second outlet of said first tank in heat exchange relationship with said evaporator and back to said first tank via said second inlet of said first tank, whereby heat in said first liquid so circulated is given up to a heat exchange fluid in said evaporator, and means for circulating said second liquid from said second tank via said first outlet of said second tank in heat exchange relationship with said condenser and back to said second tank via said second inlet of said second tank, whereby heat in said heat exchange fluid in said condenser is given up to said second liquid.
2. A system according to claim 1, wherein said separator comprises a plate having an opening therein.
3. A system according to claim 2, wherein the opening in said plate is centrally located.
4. A system according to claim 2, wherein said plate is snapped into position within said second tank.
5. A system according to claim 1 including means for thermally insulating said first liquid in said riser channel from said first liquid in said first tank.
.12.
.12.
6. A storage tank for liquid, said tank having a top, a bottom and side walls, means including a first inlet for introducing liquid to be heated into said tank adjacent said bottom thereof, electrical heating means for heating said liquid located in the upper part of said tank, a first outlet from said tank for said liquid, a second inlet into said tank for said liquid, said second inlet being located below said electrical heating means and above said first outlet, said first outlet being located between said second inlet and said bottom of said tank, a second outlet from said tank for said liquid, said second outlet being located above said electrical heating means, and means for assisting the thermal stratification of said liquid in said tank, the last-mentioned means comprising a separator located within said tank below said electrical heating means and above said second inlet, said separator inhibiting substantial movement of liquid from below said separator to above said separator but permitting a sufficient flow of liquid from said tank via said second cutlet in response to demand.
.13.
.13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000422836A CA1162917A (en) | 1983-03-03 | 1983-03-03 | System for recovering heat from a first liquid and using it to heat second liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000422836A CA1162917A (en) | 1983-03-03 | 1983-03-03 | System for recovering heat from a first liquid and using it to heat second liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1162917A true CA1162917A (en) | 1984-02-28 |
Family
ID=4124702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000422836A Expired CA1162917A (en) | 1983-03-03 | 1983-03-03 | System for recovering heat from a first liquid and using it to heat second liquid |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1162917A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5473907A (en) * | 1994-11-22 | 1995-12-12 | Briggs; Floyd | Heat pump with supplementary heat |
| AT406082B (en) * | 1996-01-30 | 2000-02-25 | Vaillant Gmbh | Layer accumulator device with cold water feed issuing in lowermost area - has cold water outlet and hot water feed issuing in uppermost area from which user water conduit leads away |
| WO2012061945A1 (en) * | 2010-11-10 | 2012-05-18 | Ambercore Software Inc. | System and method for object searching using spatial data |
| US20130228309A1 (en) * | 2010-11-09 | 2013-09-05 | Thomas Wood | Process and Apparatus for Recovering Energy from Wastewater |
-
1983
- 1983-03-03 CA CA000422836A patent/CA1162917A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5473907A (en) * | 1994-11-22 | 1995-12-12 | Briggs; Floyd | Heat pump with supplementary heat |
| AT406082B (en) * | 1996-01-30 | 2000-02-25 | Vaillant Gmbh | Layer accumulator device with cold water feed issuing in lowermost area - has cold water outlet and hot water feed issuing in uppermost area from which user water conduit leads away |
| US20130228309A1 (en) * | 2010-11-09 | 2013-09-05 | Thomas Wood | Process and Apparatus for Recovering Energy from Wastewater |
| WO2012061945A1 (en) * | 2010-11-10 | 2012-05-18 | Ambercore Software Inc. | System and method for object searching using spatial data |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3055810A (en) | Method and apparatus for purifying water | |
| US5286351A (en) | Water distilling method | |
| US4341263A (en) | Waste water heat recovery apparatus | |
| US7726263B2 (en) | Water heating and storage system | |
| US4550771A (en) | Waste water heat recovery apparatus | |
| US4207752A (en) | Method and apparatus for recovering heat from waste water | |
| US6837303B2 (en) | Internal water tank solar heat exchanger | |
| WO1985005575A1 (en) | Method of and unit for recovery of waste energy | |
| CA1162917A (en) | System for recovering heat from a first liquid and using it to heat second liquid | |
| GB2060864A (en) | Method and plant for heat recovery from sewage water | |
| CA1168226A (en) | System for recovering heat from a first liquid and using it to heat a second liquid | |
| CN2218505Y (en) | Energy saving type multipurpose electric heating machine for drinking water | |
| JPS628695B2 (en) | ||
| JPS57127745A (en) | Solar water heater | |
| US2223595A (en) | Degreasing means | |
| JP2548667B2 (en) | Heat exchange device between dirty hot waste water and fresh water | |
| KR101041608B1 (en) | Electric power saving type water purifier using waste heat | |
| RU2725403C1 (en) | System for water purification by recrystallisation and sectional heat exchange device for its implementation (versions) | |
| GB2304877A (en) | Water supply with heat recovery | |
| CN1502559A (en) | Hot vapour heating, heat siphon circulation submerged pipe type multi-effect evaporation desalting apparatus | |
| JPH0658624A (en) | Heat recovery device for waste water of bathroom | |
| EP0088055A1 (en) | Device for recovering heat from domestic water | |
| CN208155094U (en) | Gaseous phase deposition stove spiral tar-removing device | |
| JP3666266B2 (en) | Hot water system | |
| JPS59229139A (en) | Solar heat-utilizing hot-water supply device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |