CN103398503B - Comprehensive waste heat utilization system and outlet-water thermostatic control method thereof - Google Patents
Comprehensive waste heat utilization system and outlet-water thermostatic control method thereof Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 307
- 239000002918 waste heat Substances 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000010438 heat treatment Methods 0.000 claims abstract description 161
- 239000002351 wastewater Substances 0.000 claims abstract description 155
- 238000011084 recovery Methods 0.000 claims abstract description 69
- 238000004378 air conditioning Methods 0.000 claims abstract description 49
- 239000007788 liquid Substances 0.000 claims description 45
- 239000003507 refrigerant Substances 0.000 claims description 32
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 16
- 230000005611 electricity Effects 0.000 claims description 13
- 238000012544 monitoring process Methods 0.000 claims description 12
- 239000008236 heating water Substances 0.000 claims description 10
- 239000002826 coolant Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 230000009977 dual effect Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract description 3
- 238000004321 preservation Methods 0.000 abstract 2
- 230000004069 differentiation Effects 0.000 abstract 1
- 230000010354 integration Effects 0.000 abstract 1
- 230000007704 transition Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000004043 dyeing Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000007639 printing Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000010792 warming Methods 0.000 description 3
- 238000013475 authorization Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 239000003643 water by type Substances 0.000 description 2
- 238000003287 bathing Methods 0.000 description 1
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- 238000009835 boiling Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 238000005272 metallurgy Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
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Abstract
The invention relates to a fluid heater utilizing a heat pump and a controlling method of the fluid heater, in particular to a comprehensive waste heat utilization system and an outlet-water thermostatic control method thereof. The comprehensive waste heat utilization system comprises an instant waste heat recovery heating unit, a heat preservation water tank, a single chip microcomputer control unit, a wastewater pool and an air conditioning terminal. A cold water inlet pipeline is connected to a water/water heat exchanger through a water inlet solenoid valve and then connected to the heat preservation water tank through a thermostatic control valve and a condenser to form a hot water circulation loop of the comprehensive waste heat utilization system. The wastewater pool is connected to the water/water heat exchanger of the instant waste heat recovery heating unit through a first three-way valve and a heat source circulating pump and then connected to a water outlet through an evaporator and a third three-way valve to form a waste heat recovery heating loop of the comprehensive waste heat utilization system. The single chip microcomputer control unit executes a PID (proportion integration differentiation) algorithm through the thermostatic control valve according to the relation of the water temperature of the water tank, the wastewater temperature and the set water temperature to control opening of the thermostatic control valve and regulate water flow so as to guarantee that the water temperature of the water tank is kept in constant when the wastewater temperature fluctuates.
Description
Technical field
The present invention relates to a kind of fluid heater and the control method thereof that utilize heat pump, particularly relate to and a kind ofly adopt the used heat utilization system of heat pump and the water outlet constant-temperature control method for this system.
Background technology
The enterprises such as printing and dyeing, electronics, food processing, chemical industry, metallurgy all need to supply a large amount of hot water in process of production, produce again more spent hot water (30 ~ 70 DEG C) simultaneously, big-and-middle-sized collective bathroom also has a large amount of bathing spent hot waters (about 30 DEG C) to produce, the spent hot water that these modern industries are produced and discharged in life, usually can not reuse after generation, but be directly discharged in environment, or be discharged in environment after the purified treatment of corresponding requirements.These used heat are not only not used, and produce thermal pollution on the contrary to environment.Chinese invention patent " a kind of energy-saving printing and dyeing water utilization method of recycling waste heat and system " (Chinese invention patent ZL200610027350.2, Authorization Notice No. CN100586868C) disclose a kind of energy-saving printing and dyeing water utilization method and system of recycling waste heat, system comprises cold refrigerator, explained hereafter equipment, waste water mixing pit, waste water source source pump, hot-tub and biochemical treatment tank, feature is: because explained hereafter equipment enters the various waste heat clean waters produced in production process in waste water mixing pit, pump into waste water source source pump through waste water pump again to reclaim and be boiling hotly heated into hot water to the cold water in waste heat tank, through hot water transfer pump, hot water is pumped into explained hereafter equipment for production again, form the energy-saving printing and dyeing water utilization system of recycling waste heat, its method comprises: explained hereafter equipment is got rid of unholiness remaining hot water and takes in waste water mixing pit, use waste water source source pump to reclaim waste heat cold water, hot water is stored in hot-tub, hot water supply explained hereafter equipment use in hot-tub.This invention obviously can save energy consumption, and improves the temperature difference entering cold water one steam of explained hereafter equipment, and heating tube road junction is not damaged because of expansion.Chinese invention patent " wastewater source heat pump water heater of residential buildings " (Chinese invention patent ZL201010144858.7, Authorization Notice No. CN101818938B) disclose a kind of wastewater source heat pump water heater of residential buildings, it comprises refrigerant circulation loop, Waste Water Centralized pipe, wastewater discharge pipe, running water pipe, heat supply water pipe, waste water heat recovering heat exchanger, hot water transition conduit and waste water transition conduit, Waste Water Centralized pipe is communicated with waste water heat recovering heat exchanger, waste water heat recovering heat exchanger is communicated with waste water transition conduit, and waste water transition conduit is communicated with wastewater heat exchange device; Running water pipe is communicated with waste water heat recovering heat exchanger, and waste water heat recovering heat exchanger is communicated with hot water transition conduit, and hot water transition conduit is communicated with hot water heat exchanger.This heat pump water-heating machine Energy Efficiency Ratio is high and compressor can be avoided to damage because of overload operation.
But, because industrial trade waste water day discharge capacity is larger, the storage of waste water impossible long period, also there is the problem of waste water water temperature instability simultaneously, especially to damage or under the wastewater temperature change influence factor such as excessive at heat pump, there is the heat being difficult to fully recycle waste water in above-mentioned existing system, system is difficult to realize long-term safety, stable, Effec-tive Function.
Summary of the invention
The object of the invention is to provide a kind of used heat utilization system, industrial enterprise spent hot water day discharge capacity is larger for solving, waste water water temperature is unstable, waste water can not the storage of long period, the technical problem that the heat of waste water can not fully be recycled.
The present invention solves the problems of the technologies described above adopted technical scheme:
A kind of used heat utilization system, comprise Instant heating type Waste Heat Recovery heating unit, attemperater, single chip control unit, wastewater disposal basin and air conditioning terminal, is characterized in that:
Described Instant heating type Waste Heat Recovery heating unit comprises the first compressor, second compressor, first throttle valve, second throttle, evaporimeter, the first gas-liquid separator, the dual system heat pump of the second gas-liquid separator and condenser composition, and entering water electromagnetic valve, thermostatic control valve and the water/water-to-water heat exchanger for elementary recuperation of heat;
From the cold water inlet road of cold water booster pump, by being connected to the cold water inlet of water/water-to-water heat exchanger, the delivery port of water/water-to-water heat exchanger, by thermostatic control valve, is connected to the water inlet of condenser; Attemperater passes through Constant Temperature Circulator, be connected to the constant temperature water inlet of Instant heating type Waste Heat Recovery heating unit, the hot water of attemperater is transmitted back to the water inlet of condenser, the hot water outlet of condenser is connected to described attemperater, forms the hot water circulation loop of described used heat utilization system;
Wastewater disposal basin is connected to the entrance of the first triple valve, the B port of the first triple valve is by least one heat-source Cycles pump, be connected to the water intake of Instant heating type Waste Heat Recovery heating unit, spent hot water is transported to the waterwater entrance of water/water-to-water heat exchanger, the wastewater outlet of water/water-to-water heat exchanger is connected to the waterwater entrance of evaporimeter, the wastewater effluent mouth of evaporimeter is connected to the A port of the 3rd triple valve, be connected to discharge outlet by the C port of the 3rd triple valve again, form the Waste Heat Recovery heating circuit of described used heat utilization system;
The B port of the 3rd triple valve, air conditioning terminal is connected to by check valve, by the low-temperature wastewater that Instant heating type Waste Heat Recovery heating unit is discharged, be transported to air conditioning terminal and realize air conditioner refrigerating function, the wastewater outlet of air conditioning terminal is connected to the A port of the second triple valve, be connected to discharge outlet by the C port of the second triple valve, form the air conditioner refrigerating loop of described used heat utilization system;
The C port of the first triple valve is connected to air conditioning terminal, spent hot water is transported to air conditioning terminal and realizes air-conditioning heating function, the wastewater outlet of air conditioning terminal is connected to the A port of the second triple valve, be connected to discharge outlet by the C port of the second triple valve, form the used heat heating loop of described used heat utilization system; The B port of the second triple valve is connected to the entrance of described heat-source Cycles pump, and the waste water of air conditioning terminal is transported to described Waste Heat Recovery heating circuit again, realizes used heat heating water heating function simultaneously;
The sensing element for detecting cistern water level and water tank temperature is provided with in described attemperater; The input signal end of described single chip control unit is connected to described sensing element, the cistern water level arrived according to sensing element senses and water tank temperature produce control signal, are sent to the control input end of entering water electromagnetic valve, thermostatic control valve, heat-source Cycles pump and Constant Temperature Circulator;
The control signal output of described single chip control unit, be also connected to described first triple valve, the control input end of the second triple valve and the 3rd triple valve, according to the operational mode of selected used heat utilization system, can control the on-state of each triple valve.
The one preferably technical scheme of used heat utilization system of the present invention, it is characterized in that described evaporimeter and condenser include twinplex coolant channel, the first described compressor and the second compressor are respectively by a wherein road coolant channel, connect into independently two-way refrigerant circulation loop, form compressor two-shipper standby structure mutually; The running status of single chip control unit Real-Time Monitoring two compressor, if the compressor of two-shipper mutually in standby structure is stopped transport because of fault, then uses another compressor maintaining heat heat pump heating water function.
The better technical scheme of one of used heat utilization system of the present invention, is characterized in that the water intake of described Instant heating type Waste Heat Recovery heating unit is provided with wastewater temperature sensing element; Described heat-source Cycles pump comprises the first heat-source Cycles pump and Secondary Heat Source circulating pump, and two heat-source Cycles pumps connect and compose two-shipper standby structure mutually side by side; Described single chip control unit according to wastewater temperature, can control the first heat-source Cycles pump and Secondary Heat Source circulating pump opening respectively; The running status of single chip control unit 300 Real-Time Monitoring two heat-source Cycles pumps, if two-shipper is stopped transport for a heat-source Cycles failure of pump in structure mutually, then uses another heat-source Cycles pump to maintain waste water circulation function.
Another object of the present invention to provide a kind of water outlet constant-temperature control method for above-mentioned used heat utilization system.The present invention solves the problems of the technologies described above adopted technical scheme:
For a used heat utilization system water outlet constant-temperature control method for above-mentioned used heat utilization system, it is characterized in that comprising the following steps:
S100: obtain set water temperature, water temperature return difference setting value and preset running mode, by changing the powering state of the first triple valve, the second triple valve and the 3rd triple valve, selects the operational mode of used heat utilization system;
S200: the gentle cistern water level of Water in Water Tank detecting the wastewater temperature of wastewater disposal basin, attemperater in real time;
S300: under cistern water level is lower than water level in limited time, starts Instant heating type Waste Heat Recovery heating unit, opens entering water electromagnetic valve, start the first compressor, the second compressor and heat-source Cycles pump; Prescribe a time limit when cistern water level reaches on water level, Instant heating type Waste Heat Recovery heating unit is out of service;
S400: first influent waste water and the cold water water inlet of Instant heating type Waste Heat Recovery heating unit enter water/water-to-water heat exchanger, carry out elementary recuperation of heat;
S500: the waste water that water/water-to-water heat exchanger flows out, then enter evaporimeter and carry out secondary recuperation of heat;
S600: the cold water heated up through water/water-to-water heat exchanger heat exchange, then through thermostatic control valve, enter condenser and carry out post bake, make hot water and send into attemperater;
S700: according to the difference of water tank water temperature and set water temperature, single chip control unit calculates the aperture of thermostatic control valve, performs pid algorithm by thermostatic control valve and controls discharge, thus ensures that water tank water temperature reaches setting value;
Described step S100 comprises the operational mode of the following used heat utilization system that can select:
S120: water heating simultaneously cooling operation mode: the first triple valve be electricity condition, the second triple valve is power failure state, the 3rd triple valve be electricity condition; The waste water of wastewater disposal basin, via the first triple valve, by heat-source Cycles transport pump to Instant heating type Waste Heat Recovery heating unit, realizes two levels of thermal and reclaims hot water preparing function; The low-temperature wastewater of Instant heating type Waste Heat Recovery heating unit wastewater effluent mouth, then by the 3rd triple valve, flow into air-conditioning end via check valve and realize refrigerating function, then by the second triple valve discharge;
S140: a water heating operational mode: the first triple valve be electricity condition, the 3rd triple valve is power failure state; From the waste water that the wastewater effluent mouth of Instant heating type Waste Heat Recovery heating unit flows out, directly discharged by the 3rd triple valve.
S160: heating is water heating mode of operation simultaneously: the first triple valve is power failure state, the second triple valve be electricity condition, the 3rd triple valve is power failure state; The waste water of wastewater disposal basin, by the first triple valve, enters air-conditioning end and realizes heating function; The waste water that air-conditioning end flows out, via the second triple valve, by heat-source Cycles transport pump to Instant heating type Waste Heat Recovery heating unit, realizes two levels of thermal and reclaims hot water preparing function; The waste water of Instant heating type Waste Heat Recovery heating unit wastewater effluent mouth, is directly discharged by the 3rd triple valve;
S180: a heating mode of operation: the first triple valve is power failure state, the second triple valve is power failure state; The waste water of wastewater disposal basin, by the first triple valve, enters air-conditioning end and realizes heating function; The waste water that air-conditioning end flows out, directly discharges via the second triple valve.
The one preferably technical scheme of used heat utilization system water outlet constant-temperature control method of the present invention, characterized by further comprising the following step entering and exit constant temperature circulating running status:
S350: when cistern water level reaches the water level upper limit, after Instant heating type Waste Heat Recovery heating unit is out of service, if water tank temperature reduces and exceedes water temperature return difference setting value, then start Instant heating type Waste Heat Recovery heating unit according to preset running mode, open constant temperature water pump, and close entering water electromagnetic valve, system enters constant temperature circulating running status; After water tank temperature reaches set water temperature, system exits constant temperature circulating running status.
The better technical scheme of one of used heat utilization system water outlet constant-temperature control method of the present invention, is characterized in that described heat-source Cycles pump comprises the first heat-source Cycles pump and Secondary Heat Source circulating pump; If wastewater temperature is higher than 50 DEG C, then open the first heat-source Cycles pump or Secondary Heat Source circulating pump; If wastewater temperature is lower than 50 DEG C, then open the first heat-source Cycles pump and Secondary Heat Source circulating pump simultaneously, thus increase the internal circulating load of waste water.
The technical scheme of a kind of improvement of used heat utilization system water outlet constant-temperature control method of the present invention, is characterized in that the first heat-source Cycles pump and Secondary Heat Source circulating pump form two-shipper standby structure mutually; The running status of single chip control unit Real-Time Monitoring two heat-source Cycles pumps, when a heat-source Cycles failure of pump in two-shipper mutually standby structure is stopped transport, can use another heat-source Cycles pump to maintain waste water circulation function.
The technical scheme of a kind of further improvement of used heat utilization system water outlet constant-temperature control method of the present invention, is characterized in that the first compressor and the second compressor form two-shipper standby structure mutually; The running status of single chip control unit Real-Time Monitoring two compressor, when the compressor in two-shipper mutually standby structure is stopped transport because of fault, can use another compressor maintaining heat heat pump heating water function.
The invention has the beneficial effects as follows:
1, used heat utilization system of the present invention and water outlet constant-temperature control method thereof, by Multi-stage heat recovery technology, realize the large temperature difference and reclaim used heat, solve that larger, the waste water water temperature of industrial trade day wastewater discharge is unstable, waste water can not the problem of storage of long period, the heat major part of waste water can be made to be recycled, the water ejected no longer causes environmental thermal pollution, thus can save the construction investment of cooling tower and the operating cost in later stage.
2, used heat utilization system of the present invention adopts the method that SCM program controls, according to the relation between water tank water temperature, wastewater temperature, set water temperature, pid algorithm is performed by thermostatic control valve, control the aperture of thermostatic control valve, regulating water flow, thus ensure that when wastewater temperature fluctuates water tank water temperature keeps constant, and can at 40 DEG C of-65 DEG C of free settings.
3, the Instant heating type Waste Heat Recovery that used heat utilization system of the present invention adopts heats unit, utilize the special anticorrosion heat exchanger designed with enhanced heat exchange, realize twin-stage recuperation of heat and energy trasfer comprehensive utilization, product efficiency can reach 13, and to ensure when wastewater temperature changes can safely, stable, Effec-tive Function.
4, the present invention adopts two-way to go out water management and two-shipper standby structure mutually, ensure that product also can normally produce satisfactory hot water at single compressor and single heat-source Cycles pump state, can prevent from the compressor damage ring from affecting another compressor normally to run, when an equipment in two-shipper mutually standby structure breaks down out of service, another that can ensure source pump does not have out of order system can safety, stable, Effec-tive Function.
Accompanying drawing explanation
Fig. 1 is the systematic schematic diagram of used heat utilization system of the present invention;
Fig. 2 is the structural representation of Instant heating type Waste Heat Recovery heating unit;
Fig. 3 is the structural representation of the Instant heating type Waste Heat Recovery heating unit using band recuperation of heat gas to divide;
Fig. 4 is used heat utilization system water outlet constant-temperature control method flow chart of the present invention;
Fig. 5 is the structural representation of the gas-liquid separator of band recuperation of heat structure.
The label of each parts in above figure: 100-Instant heating type Waste Heat Recovery heating unit, 111-first compressor, 112-second compressor, 121-first throttle valve, 122-second throttle, 130-evaporimeter, 141-first gas-liquid separator, 142-second gas-liquid separator, 150-condenser, 160-water/water-to-water heat exchanger, 200-attemperater, 210-sensing element, 211-wastewater temperature sensing element, 220-cold water booster pump, 230-Constant Temperature Circulator, 240-drain valve, 300-single chip control unit, 310-first triple valve, 320-second triple valve, 330-the 3rd triple valve, 340-check valve, 350-entering water electromagnetic valve, 360-thermostatic control valve, 400-wastewater disposal basin, 411-first heat-source Cycles pump, 412-Secondary Heat Source circulating pump, 500-air conditioning terminal, A-liquid refrigerant inlet, B-liquid refrigerant outlet, C-gaseous refrigerant inlet, D-gaseous refrigerant exports, E-recuperation of heat heat exchanging chamber, F-gas-liquid separation chamber.
Detailed description of the invention
In order to technique scheme of the present invention can be understood better, describe in detail further below in conjunction with drawings and Examples.
Fig. 1 is an embodiment of monolithic processor controlled used heat utilization system, and described used heat utilization system comprises the heating of Instant heating type Waste Heat Recovery unit 100, attemperater 200, single chip control unit 300, wastewater disposal basin 400 and air conditioning terminal 500.
Fig. 2 illustrates an embodiment of the Instant heating type Waste Heat Recovery heating unit 100 of used heat utilization system of the present invention, described Instant heating type Waste Heat Recovery heating unit 100 comprises the first compressor 111, second compressor 112, first throttle valve 121, second throttle 122, evaporimeter 130, first gas-liquid separator 141, the dual system heat pump that second gas-liquid separator 142 and condenser 150 form, and entering water electromagnetic valve 350, thermostatic control valve 360 and the water/water-to-water heat exchanger 160 for elementary recuperation of heat; Instant heating type Waste Heat Recovery heating unit 100 represented by dashed line and the control connection between single chip control unit 300 and each sensing element is made in Fig. 2.
From the cold water inlet road of cold water booster pump 220, be connected to the cold water inlet of water/water-to-water heat exchanger 160 by entering water electromagnetic valve 350, the delivery port of water/water-to-water heat exchanger 160, by thermostatic control valve 360, is connected to the water inlet of condenser 150; Attemperater 200 is by Constant Temperature Circulator 230, be connected to the constant temperature water inlet of Instant heating type Waste Heat Recovery heating unit 100, the hot water of attemperater 200 is transmitted back to the water inlet of condenser 150, the hot water outlet of condenser 150 is connected to described attemperater 200, form the hot water circulation loop of described used heat utilization system, see Fig. 1 and Fig. 2.
Embodiment according to Fig. 1 and Fig. 2, wastewater disposal basin 400 is connected to the A port 31A of the first triple valve 310, the B port 31B of the first triple valve 310 is by least one heat-source Cycles pump, be connected to the water intake of Instant heating type Waste Heat Recovery heating unit 100, spent hot water is transported to the waterwater entrance of water/water-to-water heat exchanger 160, the wastewater outlet of water/water-to-water heat exchanger 160 is connected to the waterwater entrance of evaporimeter 130, the wastewater effluent mouth of evaporimeter 130 is connected to the A port 33A of the 3rd triple valve 330, discharge outlet is connected to again by the C port 33C of the 3rd triple valve 330, form the Waste Heat Recovery heating circuit of described used heat utilization system,
The B port 33B of the 3rd triple valve 330, air conditioning terminal 500 is connected to by check valve 340, by the low-temperature wastewater that Instant heating type Waste Heat Recovery heating unit 100 is discharged, be transported to air conditioning terminal 500 and realize air conditioner refrigerating function, the wastewater outlet of air conditioning terminal 500 is connected to the A port 32A of the second triple valve 320, be connected to discharge outlet by the C port 32C of the second triple valve 320, form the air conditioner refrigerating loop of described used heat utilization system;
The C port 31C of the first triple valve 310 is connected to air conditioning terminal 500, spent hot water is transported to air conditioning terminal 500 and realizes air-conditioning heating function, the wastewater outlet of air conditioning terminal 500 is connected to the A port 32A of the second triple valve 320, be connected to discharge outlet by the C port 32C of the second triple valve 320, form the used heat heating loop of described used heat utilization system; The B port 32B of the second triple valve 320 is connected to the entrance of described heat-source Cycles pump, and the waste water of air conditioning terminal 500 is transported to described Waste Heat Recovery heating circuit again, realizes used heat heating water heating function simultaneously;
The sensing element 210 for detecting cistern water level and water tank temperature is provided with in described attemperater 200; The input signal end of described single chip control unit 300 is connected to described sensing element 210, the cistern water level detected according to sensing element 210 and water tank temperature produce control signal, are sent to the control input end of entering water electromagnetic valve 350, thermostatic control valve 360, heat-source Cycles pump and Constant Temperature Circulator 230;
The control signal output of described single chip control unit 300, be also connected to described first triple valve 310, the control input end of the second triple valve 320 and the 3rd triple valve 330, according to the operational mode of selected used heat utilization system, can control the on-state of each triple valve.
The embodiment of the Instant heating type Waste Heat Recovery heating unit according to Fig. 2, described evaporimeter 130 and condenser 150 include twinplex coolant channel, the first described compressor 111 and the second compressor 112 are respectively by a wherein road coolant channel, connect into independently two-way refrigerant circulation loop, form compressor two-shipper standby structure mutually; The running status of single chip control unit 300 Real-Time Monitoring two compressor, if the compressor of two-shipper mutually in standby structure is stopped transport because of fault, then uses another compressor maintaining heat heat pump heating water function.
The embodiment of the used heat utilization system according to Fig. 1, the water intake of described Instant heating type Waste Heat Recovery heating unit 100 is provided with wastewater temperature sensing element 211; Described heat-source Cycles pump comprises the first heat-source Cycles pump 411 and Secondary Heat Source circulating pump 412, two heat-source Cycles pumps connect and compose two-shipper standby structure mutually side by side; Described single chip control unit 300 according to wastewater temperature, can control the first heat-source Cycles pump 411 and Secondary Heat Source circulating pump 412 opening respectively; The running status of single chip control unit 300 Real-Time Monitoring two heat-source Cycles pumps, if two-shipper is stopped transport for a heat-source Cycles failure of pump in structure mutually, then uses another heat-source Cycles pump to maintain waste water circulation function.
The embodiment of the Instant heating type Waste Heat Recovery heating unit that the band recuperation of heat gas according to Fig. 3 divides, first gas-liquid separator 141 and the second gas-liquid separator 142 of described Instant heating type Waste Heat Recovery heating unit 100, adopt the gas-liquid separator of band recuperation of heat structure (being called for short band recuperation of heat gas to divide), the gas-liquid separator of described band recuperation of heat structure as shown in Figure 5, comprises liquid refrigerant inlet A, liquid refrigerant outlet B, gaseous refrigerant inlet C, gaseous refrigerant outlet D, recuperation of heat heat exchanging chamber E and gas-liquid separation chamber F; The two-way refrigerant circulation flow process of described Instant heating type Waste Heat Recovery heating unit 100 is as follows:
The air entry of gaseous refrigerant outlet D-first compressor 111 of gas-liquid separation chamber F-first gas-liquid separator 141 of gaseous refrigerant inlet C-first gas-liquid separator 141 of liquid refrigerant outlet B-first throttle valve 121-evaporimeter 130-first gas-liquid separator 141 of recuperation of heat heat exchanging chamber E-first gas-liquid separator 141 of liquid refrigerant inlet A-first gas-liquid separator 141 of exhaust outlet-condenser 150-first gas-liquid separator 141 of the first compressor 111;
The air entry of gaseous refrigerant outlet D-second compressor 112 of gas-liquid separation chamber F-second gas-liquid separator 142 of gaseous refrigerant inlet C-second gas-liquid separator 142 of liquid refrigerant outlet B-second throttle 122-evaporimeter 130-second gas-liquid separator 142 of recuperation of heat heat exchanging chamber E-second gas-liquid separator 142 of liquid refrigerant inlet A-second gas-liquid separator 142 of exhaust outlet-condenser 150-second gas-liquid separator 142 of the second compressor 112.
Fig. 4 is the flow chart of an embodiment of used heat utilization system water outlet constant-temperature control method of the present invention, the flow chart of the present embodiment only contains the basic step realizing constant temperature flow rate adjusting method, eliminate those skilled in the art the well-known routines step needed for process such as the microsystem computer software and hardware power-up initializing be familiar with.
Used heat utilization system water outlet constant-temperature control method of the present invention shown in Fig. 4 comprises the following steps:
S100: obtain set water temperature, water temperature return difference setting value and preset running mode, by changing the powering state of the first triple valve 310, second triple valve 320 and the 3rd triple valve 330, selects the operational mode of used heat utilization system;
S200: the gentle cistern water level of Water in Water Tank detecting the wastewater temperature of wastewater disposal basin 400, attemperater 200 in real time;
S300: under cistern water level is lower than water level in limited time, starts Instant heating type Waste Heat Recovery heating unit 100, opens entering water electromagnetic valve 350, start the first compressor 111, second compressor 112 and heat-source Cycles pump; Prescribe a time limit when cistern water level reaches on water level, Instant heating type Waste Heat Recovery heating unit 100 is out of service;
S400: first influent waste water and the cold water water inlet of Instant heating type Waste Heat Recovery heating unit 100 enter water/water-to-water heat exchanger 160, carry out elementary recuperation of heat;
S500: the waste water that water/water-to-water heat exchanger 160 flows out, then enter evaporimeter 130 and carry out secondary recuperation of heat;
S600: the cold water heated up through water/water-to-water heat exchanger 160 heat exchange, then through thermostatic control valve 360, enter condenser 150 and carry out post bake, make hot water and send into attemperater 200;
S700: according to the difference of water tank water temperature and set water temperature, single chip control unit 300 calculates the aperture of thermostatic control valve 360, performs pid algorithm by thermostatic control valve 360 and controls discharge, thus ensures that water tank water temperature reaches setting value;
Described step S100 comprises the operational mode of the following used heat utilization system that can select:
S120: water heating simultaneously cooling operation mode: the first triple valve 310 be electricity condition, port 31A-31B connects, and port 31A-31C closes; Second triple valve 320 is power failure state, and port 32A-32B closes, and port 32A-32C connects; 3rd triple valve 330 be electricity condition, port 33A-33B connects, and port 33A-33C closes; The waste water of wastewater disposal basin 400, via the port 31A-31B of the first triple valve 310, by heat-source Cycles transport pump to Instant heating type Waste Heat Recovery heating unit 100, realizes two levels of thermal and reclaims hot water preparing function; The low-temperature wastewater of Instant heating type Waste Heat Recovery heating unit 100 wastewater effluent mouth, again by the port 33A-33B of the 3rd triple valve 330, flow into air-conditioning end 500 via check valve 340 and realize refrigerating function, then discharged by the port 32A-32C of the second triple valve 320;
S140: a water heating operational mode: first triple valve 310 be electricity condition, port 31A-31B connects, and port 31A-31C closes; 3rd triple valve 330 is power failure state, and port 33A-33B closes, and port 33A-33C connects; From the waste water that the wastewater effluent mouth of Instant heating type Waste Heat Recovery heating unit 100 flows out, directly discharged by the port 33A-33C of the 3rd triple valve 330.
S160: heating is water heating mode of operation simultaneously: the first triple valve 310 is power failure state, and port 31A-31B closes, and port 31A-31C connects; Second triple valve 320 be electricity condition, port 32A-32B connects, and port 32A-32C closes; 3rd triple valve 330 is power failure state, and port 33A-33B closes, and port 33A-33C connects; The waste water of wastewater disposal basin, by the port 31A-31C of the first triple valve 310, enters air-conditioning end 500 and realizes heating function; The waste water that air-conditioning end 500 flows out, via the port 32A-32B of the second triple valve 320, by heat-source Cycles transport pump to Instant heating type Waste Heat Recovery heating unit 100, realizes two levels of thermal and reclaims hot water preparing function; The waste water of Instant heating type Waste Heat Recovery heating unit 100 wastewater effluent mouth, is directly discharged by the port 33A-33C of the 3rd triple valve 330;
S180: a heating mode of operation: first triple valve 310 is power failure state, and port 31A-31B closes, and port 31A-31C connects; Second triple valve 320 is power failure state, and port 32A-32B closes, and port 32A-32C connects; The waste water of wastewater disposal basin, by the port 31A-31C of the first triple valve 310, enters air-conditioning end 500 and realizes heating function; The waste water that air-conditioning end 500 flows out, the port 32A-32C via the second triple valve 320 directly discharges.
The embodiment of the used heat utilization system water outlet constant-temperature control method according to Fig. 4, also comprises the following step entering and exit constant temperature circulating running status:
S350: when cistern water level reaches the water level upper limit, after Instant heating type Waste Heat Recovery heating unit 100 is out of service, if water tank temperature reduces and exceedes water temperature return difference setting value, then start Instant heating type Waste Heat Recovery heating unit 100 according to preset running mode, open constant temperature water pump 230, and close entering water electromagnetic valve 350, system enters constant temperature circulating running status; After water tank temperature reaches set water temperature, system exits constant temperature circulating running status.
When the Instant heating type Waste Heat Recovery heating unit divided when adopting the band recuperation of heat gas shown in Fig. 3 builds used heat utilization system, described water outlet constant-temperature control method, also comprises following refrigerant circulation flow process:
S810: the high temperature and high pressure gaseous refrigerant that compressor is discharged enters condenser, release heat is to by the cold water that heats, and gaseous refrigerant condenses be liquid state;
S820: be condensed into liquid cold-producing medium by liquid refrigerant inlet A, enters the heat in the recuperation of heat heat exchanging chamber E recovering liquid cold-producing medium being with recuperation of heat gas to divide;
S830: the sub-cooled liquid refrigerant in recuperation of heat heat exchanging chamber E, flows out via liquid refrigerant outlet B, after choke valve reducing pressure by regulating flow, enters in evaporimeter the heat absorbed in waste water, and vaporization becomes low-pressure gaseous refrigerant;
S840: low-pressure gaseous refrigerant is by gaseous refrigerant inlet C, enter gas-liquid separation chamber F, reclaim the heat of liquid refrigerant in recuperation of heat heat exchanging chamber E, compressor is sucked through exporting D by gaseous refrigerant after abundant vaporization, form closed-loop refrigeration agent circulation process, constantly by the transfer of heat in waste water to by the water that heats.
According to another embodiment of used heat utilization system water outlet constant-temperature control method of the present invention, described heat-source Cycles pump comprises the first heat-source Cycles pump 411 and Secondary Heat Source circulating pump 412; If wastewater temperature is higher than 50 DEG C, then open the first heat-source Cycles pump 411 or Secondary Heat Source circulating pump 412; If wastewater temperature is lower than 50 DEG C, then open the first heat-source Cycles pump 411 and Secondary Heat Source circulating pump 412 simultaneously, thus increase the internal circulating load of waste water.
According to the improvement project of above-described embodiment of used heat utilization system water outlet constant-temperature control method of the present invention, the first described heat-source Cycles pump 411 and Secondary Heat Source circulating pump 412 form two-shipper standby structure mutually; The running status of single chip control unit 300 Real-Time Monitoring two heat-source Cycles pumps, when a heat-source Cycles failure of pump in two-shipper mutually standby structure is stopped transport, can use another heat-source Cycles pump to maintain waste water circulation function.
According to a preferred embodiment of used heat utilization system water outlet constant-temperature control method of the present invention, the first described compressor 111 and the second compressor 112 form two-shipper standby structure mutually; The running status of single chip control unit 300 Real-Time Monitoring two compressor, when the compressor in two-shipper mutually standby structure is stopped transport because of fault, can use another compressor maintaining heat heat pump heating water function.
embodiment 1
Cooling and warming water running pattern: influent waste water 50 DEG C-70 DEG C and cold water intake 15 DEG C after water/water-to-water heat exchanger 160 carries out elementary recuperation of heat, between waste water Water in Water Tank temperature drop to 30 DEG C-40 DEG C, and cold water temperature rises to 25 DEG C-30 DEG C, then, waste water flows into evaporimeter 130 again and carries out secondary recuperation of heat, and the wastewater temperature of recuperation of heat is down to about 12 DEG C, from evaporimeter 130 12 DEG C of waste water out, via the 3rd triple valve 330, flow into air-conditioning end 500 by check valve 340 and freeze.Be warming up to the cold water of 25 DEG C-30 DEG C after thermostatic control valve 350, flow into condenser 150 and carry out post bake.Single chip control unit 300 in real time detects hot water water temperature, according to the difference of water tank water temperature with set water temperature, calculates the aperture of thermostatic control valve, performs pid algorithm control discharge by thermostatic control valve, thus guarantee water tank water temperature reaches setting value.
embodiment 2
Winter heating water heating mode of operation: from the wastewater disposal basin spent hot water of 50 DEG C-70 DEG C out, via the first triple valve 310, enter air-conditioning end 500 and realize heating function, the waste water that air-conditioning end 500 flows out is via the second triple valve 320, by the first heat-source Cycles pump 411 and/or Secondary Heat Source circulating pump 412, realize two levels of thermal and reclaim hot water preparing function; The water tank water temperature of air-conditioning end is between 35 DEG C-40 DEG C, enters water/water-to-water heat exchanger 160, carries out primary heat exchange with 5 DEG C of-10 DEG C of cold water from entering water electromagnetic valve 350, and between waste water Water in Water Tank temperature drop to 20 DEG C-30 DEG C, and cold water temperature rises to 15 DEG C-25 DEG C.The waste water that water/water-to-water heat exchanger 160 flows out flows into evaporimeter 130 again and carries out secondary recuperation of heat, wastewater temperature after secondary recuperation of heat is down to about 8 DEG C, be warming up to the cold water of 15 DEG C-25 DEG C after thermostatic control valve 360, flow into condenser 150 and carry out post bake, single chip control unit 300 detects hot water water temperature, according to the difference of water tank water temperature and set water temperature, calculate the aperture of thermostatic control valve, perform pid algorithm by thermostatic control valve and control discharge, thus ensure that water tank water temperature reaches setting value.From the evaporimeter waste water of about 8 DEG C out, directly discharged by the port 33A-33C of the 3rd triple valve 330.If when not needing water heating, the second triple valve 320 dead electricity, the waste water that air-conditioning end 500 flows out, the port 32A-32C via the second triple valve 320 directly discharges.
Those of ordinary skill in the art will be appreciated that; above embodiment is only used to technical scheme of the present invention is described; and be not used as limitation of the invention; any the above embodiment is done based on connotation of the present invention change, modification, all will drop in the protection domain of claim of the present invention.
Claims (8)
1. a used heat utilization system, comprise Instant heating type Waste Heat Recovery heating unit, attemperater, single chip control unit, wastewater disposal basin and air conditioning terminal, is characterized in that:
Described Instant heating type Waste Heat Recovery heating unit comprises the first compressor, second compressor, first throttle valve, second throttle, evaporimeter, the first gas-liquid separator, the dual system heat pump of the second gas-liquid separator and condenser composition, and entering water electromagnetic valve, thermostatic control valve and the water/water-to-water heat exchanger for elementary recuperation of heat;
From the cold water inlet road of cold water booster pump, be connected to the cold water inlet of water/water-to-water heat exchanger by entering water electromagnetic valve, the delivery port of water/water-to-water heat exchanger, by thermostatic control valve, is connected to the water inlet of condenser; Attemperater passes through Constant Temperature Circulator, be connected to the constant temperature water inlet of Instant heating type Waste Heat Recovery heating unit, the hot water of attemperater is transmitted back to the water inlet of condenser, the hot water outlet of condenser is connected to described attemperater, forms the hot water circulation loop of described used heat utilization system;
Wastewater disposal basin is connected to the entrance of the first triple valve, the B port of the first triple valve is by least one heat-source Cycles pump, be connected to the water intake of Instant heating type Waste Heat Recovery heating unit, spent hot water is transported to the waterwater entrance of water/water-to-water heat exchanger, the wastewater outlet of water/water-to-water heat exchanger is connected to the waterwater entrance of evaporimeter, the wastewater effluent mouth of evaporimeter is connected to the A port of the 3rd triple valve, be connected to discharge outlet by the C port of the 3rd triple valve again, form the Waste Heat Recovery heating circuit of described used heat utilization system;
The B port of the 3rd triple valve, air conditioning terminal is connected to by check valve, by the low-temperature wastewater that Instant heating type Waste Heat Recovery heating unit is discharged, be transported to air conditioning terminal and realize air conditioner refrigerating function, the wastewater outlet of air conditioning terminal is connected to the A port of the second triple valve, be connected to discharge outlet by the C port of the second triple valve, form the air conditioner refrigerating loop of described used heat utilization system;
The C port of the first triple valve is connected to air conditioning terminal, spent hot water is transported to air conditioning terminal and realizes air-conditioning heating function, the wastewater outlet of air conditioning terminal is connected to the A port of the second triple valve, be connected to discharge outlet by the C port of the second triple valve, form the used heat heating loop of described used heat utilization system; The B port of the second triple valve is connected to the entrance of described heat-source Cycles pump, and the waste water of air conditioning terminal is transported to described Waste Heat Recovery heating circuit again, realizes used heat heating water heating function simultaneously;
The sensing element for detecting cistern water level and water tank temperature is provided with in described attemperater; The input signal end of described single chip control unit is connected to described sensing element, the cistern water level arrived according to sensing element senses and water tank temperature produce control signal, are sent to the control input end of entering water electromagnetic valve, thermostatic control valve, heat-source Cycles pump and Constant Temperature Circulator;
The control signal output of described single chip control unit, be also connected to described first triple valve, the control input end of the second triple valve and the 3rd triple valve, according to the operational mode of selected used heat utilization system, can control the on-state of each triple valve.
2. used heat utilization system according to claim 1, it is characterized in that described evaporimeter and condenser include twinplex coolant channel, the first described compressor and the second compressor are respectively by a wherein road coolant channel, connect into independently two-way refrigerant circulation loop, form compressor two-shipper standby structure mutually; The running status of single chip control unit Real-Time Monitoring two compressor, if the compressor of two-shipper mutually in standby structure is stopped transport because of fault, then uses another compressor maintaining heat heat pump heating water function.
3. used heat utilization system according to claim 1 and 2, is characterized in that the water intake of described Instant heating type Waste Heat Recovery heating unit is provided with wastewater temperature sensing element; Described heat-source Cycles pump comprises the first heat-source Cycles pump and Secondary Heat Source circulating pump, and two heat-source Cycles pumps connect and compose two-shipper standby structure mutually side by side; Described single chip control unit according to wastewater temperature, can control the first heat-source Cycles pump and Secondary Heat Source circulating pump opening respectively; The running status of single chip control unit 300 Real-Time Monitoring two heat-source Cycles pumps, if two-shipper is stopped transport for a heat-source Cycles failure of pump in structure mutually, then uses another heat-source Cycles pump to maintain waste water circulation function.
4., for a used heat utilization system water outlet constant-temperature control method for the used heat utilization system described in claim 1,2 or 3, it is characterized in that comprising the following steps:
S100: obtain set water temperature, water temperature return difference setting value and preset running mode, by changing the powering state of the first triple valve, the second triple valve and the 3rd triple valve, selects the operational mode of used heat utilization system;
S200: the gentle cistern water level of Water in Water Tank detecting the wastewater temperature of wastewater disposal basin, attemperater in real time;
S300: under cistern water level is lower than water level in limited time, starts Instant heating type Waste Heat Recovery heating unit, opens entering water electromagnetic valve, start the first compressor, the second compressor and heat-source Cycles pump; Prescribe a time limit when cistern water level reaches on water level, Instant heating type Waste Heat Recovery heating unit is out of service;
S400: first influent waste water and the cold water water inlet of Instant heating type Waste Heat Recovery heating unit enter water/water-to-water heat exchanger, carry out elementary recuperation of heat;
S500: the waste water that water/water-to-water heat exchanger flows out, then enter evaporimeter and carry out secondary recuperation of heat;
S600: the cold water heated up through water/water-to-water heat exchanger heat exchange, then through thermostatic control valve, enter condenser and carry out post bake, make hot water and send into attemperater;
S700: according to the difference of water tank water temperature and set water temperature, single chip control unit calculates the aperture of thermostatic control valve, performs pid algorithm by thermostatic control valve and controls discharge, thus ensures that water tank water temperature reaches setting value;
Described step S100 comprises the operational mode of the following used heat utilization system that can select:
S120: water heating simultaneously cooling operation mode: the first triple valve be electricity condition, the second triple valve is power failure state, the 3rd triple valve be electricity condition; The waste water of wastewater disposal basin, via the first triple valve, by heat-source Cycles transport pump to Instant heating type Waste Heat Recovery heating unit, realizes two levels of thermal and reclaims hot water preparing function; The low-temperature wastewater of Instant heating type Waste Heat Recovery heating unit wastewater effluent mouth, then by the 3rd triple valve, flow into air-conditioning end via check valve and realize refrigerating function, then by the second triple valve discharge;
S140: a water heating operational mode: the first triple valve be electricity condition, the 3rd triple valve is power failure state; From the waste water that the wastewater effluent mouth of Instant heating type Waste Heat Recovery heating unit flows out, directly discharged by the 3rd triple valve;
S160: heating is water heating mode of operation simultaneously: the first triple valve is power failure state, the second triple valve be electricity condition, the 3rd triple valve is power failure state; The waste water of wastewater disposal basin, by the first triple valve, enters air-conditioning end and realizes heating function; The waste water that air-conditioning end flows out, via the second triple valve, by heat-source Cycles transport pump to Instant heating type Waste Heat Recovery heating unit, realizes two levels of thermal and reclaims hot water preparing function; The waste water of Instant heating type Waste Heat Recovery heating unit wastewater effluent mouth, is directly discharged by the 3rd triple valve;
S180: a heating mode of operation: the first triple valve is power failure state, the second triple valve is power failure state; The waste water of wastewater disposal basin, by the first triple valve, enters air-conditioning end and realizes heating function; The waste water that air-conditioning end flows out, directly discharges via the second triple valve.
5. used heat utilization system water outlet constant-temperature control method according to claim 4, characterized by further comprising the following step entering and exit constant temperature circulating running status:
S350: when cistern water level reaches the water level upper limit, after Instant heating type Waste Heat Recovery heating unit is out of service, if water tank temperature reduces and exceedes water temperature return difference setting value, then start Instant heating type Waste Heat Recovery heating unit according to preset running mode, open constant temperature water pump, and close entering water electromagnetic valve, system enters constant temperature circulating running status; After water tank temperature reaches set water temperature, system exits constant temperature circulating running status.
6. used heat utilization system water outlet constant-temperature control method according to claim 4, is characterized in that described heat-source Cycles pump comprises the first heat-source Cycles pump and Secondary Heat Source circulating pump; If wastewater temperature is higher than 50 DEG C, then open the first heat-source Cycles pump or Secondary Heat Source circulating pump; If wastewater temperature is lower than 50 DEG C, then open the first heat-source Cycles pump and Secondary Heat Source circulating pump simultaneously, thus increase the internal circulating load of waste water.
7. used heat utilization system water outlet constant-temperature control method according to claim 6, is characterized in that the first heat-source Cycles pump and Secondary Heat Source circulating pump form two-shipper standby structure mutually; The running status of single chip control unit Real-Time Monitoring two heat-source Cycles pumps, when a heat-source Cycles failure of pump in two-shipper mutually standby structure is stopped transport, can use another heat-source Cycles pump to maintain waste water circulation function.
8. the used heat utilization system water outlet constant-temperature control method according to arbitrary claim of claim 4 to 7, is characterized in that the first compressor and the second compressor form two-shipper standby structure mutually; The running status of single chip control unit Real-Time Monitoring two compressor, when the compressor in two-shipper mutually standby structure is stopped transport because of fault, can use another compressor maintaining heat heat pump heating water function.
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| CN2842290Y (en) * | 2005-07-28 | 2006-11-29 | 江苏天舒电器有限公司 | Waste-heat recovering heat-pump water-heater |
| CN101907355A (en) * | 2010-08-24 | 2010-12-08 | 江苏天舒电器有限公司 | Adaptive self-regulating energy-saving heat pump water heater and operation method thereof |
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| KR20120095232A (en) * | 2011-02-18 | 2012-08-28 | (주)이코노 | Central heating system for apartment |
| CN203443164U (en) * | 2013-07-16 | 2014-02-19 | 江苏天舒电器有限公司 | Waste heat comprehensive utilization system |
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| JP3632306B2 (en) * | 1996-07-05 | 2005-03-23 | 松下電器産業株式会社 | Heat pump bath water supply system |
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| CN2842290Y (en) * | 2005-07-28 | 2006-11-29 | 江苏天舒电器有限公司 | Waste-heat recovering heat-pump water-heater |
| CN101907355A (en) * | 2010-08-24 | 2010-12-08 | 江苏天舒电器有限公司 | Adaptive self-regulating energy-saving heat pump water heater and operation method thereof |
| KR20120095232A (en) * | 2011-02-18 | 2012-08-28 | (주)이코노 | Central heating system for apartment |
| CN202221156U (en) * | 2011-08-19 | 2012-05-16 | 东莞市蓝冠环保节能科技有限公司 | Waste-heat recovery double-source heat pump water heating system |
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