CN216924818U - Refrigeration and heating integrated system based on waste heat recovery - Google Patents
Refrigeration and heating integrated system based on waste heat recovery Download PDFInfo
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- CN216924818U CN216924818U CN202220678790.9U CN202220678790U CN216924818U CN 216924818 U CN216924818 U CN 216924818U CN 202220678790 U CN202220678790 U CN 202220678790U CN 216924818 U CN216924818 U CN 216924818U
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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Abstract
本实用新型公开了一种基于余热回收的制冷制热一体化系统，包括由蒸发器、压缩机、冷凝器、膨胀阀、闪蒸罐组成的供冷循环回路，以及由储热水罐、空气处理装置组成的供热循环回路，于压缩机和冷凝器之间设有与高温高压制冷剂换热的余热回收换热器，余热回收换热器通过管道与储热水罐连通形成回路，于储热水罐上设有对其供热的空气源热泵机组以及太阳能集热机组。本实用新型利用余热回收换热器回收供冷循环回路中产生的余热，并对供热循环回路中的储热水罐进行供热，实现制冷制热的一体化，同时，在储热水罐上增加空气源热泵机组以及太阳能集热机组对其供热，可以弥补空气源在低温环境下换热不足的缺点。
The utility model discloses a refrigeration and heating integrated system based on waste heat recovery, which comprises a cooling circulation loop composed of an evaporator, a compressor, a condenser, an expansion valve and a flash tank, and a cooling circulation loop composed of an evaporator, a compressor, a condenser, an expansion valve and a flash tank; The heat supply circulation loop composed of the treatment device is provided with a waste heat recovery heat exchanger for exchanging heat with the high temperature and high pressure refrigerant between the compressor and the condenser. The waste heat recovery heat exchanger is connected with the hot water storage tank through pipes to form a loop. The hot water storage tank is provided with an air source heat pump unit and a solar collector unit for supplying heat to it. The utility model utilizes the waste heat recovery heat exchanger to recover the waste heat generated in the cooling circulation loop, and supplies heat to the hot water storage tank in the heating circulation loop, so as to realize the integration of refrigeration and heating. The air source heat pump unit and the solar collector unit are added to supply heat to it, which can make up for the shortcoming of insufficient heat exchange of the air source in the low temperature environment.
Description
Technical Field
The utility model relates to a refrigeration and heating integrated system based on waste heat recovery, in particular to a process system capable of realizing integration of waste heat recovery, heat storage, refrigeration and heat supply, and belongs to the technical field of comprehensive utilization of energy.
Background
China is wide in region, large in population, huge in scale of house buildings, and in the rapid development stage of house construction; meanwhile, energy is in short supply in China, heating energy is huge, the current heating energy accounts for about 10% of the total energy consumption of commodities in China, and high energy consumption of heating not only causes resource consumption, but also becomes an important factor of air pollution.
The air source heat pump is an energy-saving device which can flow energy from low-level heat source air into a high-level heat source mainly by means of high level, and is one of common heat pump forms, so that low-level heat energy which is difficult to directly utilize, such as heat contained in air, is converted into high-level heat energy, and therefore part of high-level energy can be saved, especially high-level energy such as coal, gas, oil, electric energy and the like. However, when the outdoor environment temperature is low in winter, the efficiency of the air source heat pump is reduced, the exhaust temperature of the compressor is high, the air source heat pump is easy to frost, the heating amount is reduced, the heating requirement of a user is difficult to meet, and the optimization of the heating mode is urgently needed.
In the prior art, the utility model patent with the publication number of CN111141063A discloses a heat accumulating type waste heat recovery system based on an air source heat pump and a process thereof, wherein cold energy or waste heat generated by the existing refrigeration and heating equipment is recovered and stored by a cold accumulation recovery device and a heat accumulation recovery device respectively. However, in the practical application process, the amount of cold or the waste heat generated by the system is limited, and especially when the outdoor environment temperature is low in winter, the recovered heat source cannot fully meet the heating demand of the user, so that the waste heat recovery system based on the air heat source pump needs to be further improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a refrigerating and heating integrated system based on waste heat recovery, which utilizes a waste heat recovery heat exchanger to recover waste heat generated in a cooling circulation loop and supply heat to a hot water storage tank in a heating circulation loop to realize the integration of refrigerating and heating, and meanwhile, an air source heat pump unit and a solar energy heat pump unit which are coupled are added on the hot water storage tank to supply heat to the hot water storage tank, so that the defect that the air source has insufficient heat exchange in a low-temperature environment can be overcome.
The utility model is realized by the following technical scheme: the utility model provides a refrigeration and heating integration system based on waste heat recovery, includes the cooling circulation circuit of constituteing by evaporimeter, compressor, condenser, expansion valve, flash tank to and by the heat supply circulation circuit that heat storage water tank, air treatment device constitute, be equipped with the waste heat recovery heat exchanger with the heat transfer of high temperature high pressure refrigerant between compressor and condenser, the waste heat recovery heat exchanger forms the return circuit through pipeline and heat storage water tank intercommunication, be equipped with air source heat pump set and solar energy collection machine group to its heat supply on heat storage water tank.
The air source heat pump circulating unit comprises double-heat-source composite heat exchange equipment, a heat pump compressor and a heat pump throttling valve, wherein the double-heat-source composite heat exchange equipment, the heat pump compressor, a hot water storage tank and the heat pump throttling valve are sequentially communicated to form a loop; the solar heat collection unit comprises a solar heat collector and a heat storage water tank, the solar heat collector and the heat storage water tank are communicated to form a loop, and the double-heat-source composite heat exchange equipment and the heat storage water tank are communicated to form a loop.
The air source heat pump circulating unit also comprises a four-way reversing valve and a gas-liquid separator, the double-heat source composite heat exchange equipment is connected with the gas-liquid separator through the four-way reversing valve, the gas-liquid separator is communicated with a heat pump compressor, and the heat pump compressor is communicated with a hot water storage tank through the four-way reversing valve.
The heat storage water tank is communicated with the heat storage water tank to form a loop.
The evaporimeter includes low temperature evaporimeter, medium temperature evaporimeter and waste heat load evaporimeter, the compressor includes low pressure compressor and high pressure compressor, the liquid refrigerant export of flash tank communicates low temperature evaporimeter, medium temperature evaporimeter and waste heat load evaporimeter respectively, the gaseous refrigerant export intercommunication high pressure compressor of flash tank, medium temperature evaporimeter and waste heat load evaporimeter, the gaseous refrigerant export of low temperature evaporimeter communicates high pressure compressor through low pressure compressor.
Compared with the prior art, the utility model mainly has the following advantages and beneficial effects:
(1) the utility model recovers the waste heat generated by the refrigerating part (namely, the cooling circulation loop) based on the waste heat recovery heat exchanger, and then the waste heat is used for heating by the heating part (namely, the heating circulation loop) so as to realize the integration of refrigeration and heating of the system.
(2) The refrigeration part involved in the utility model adopts CO2Transcritical two-stage compression refrigerationCirculation (including low-pressure compression and high-pressure compression), and pure natural working medium CO can be selected2The refrigerant is nontoxic and nonflammable, has ODP (ozone destruction index) of 0, extremely low GWP (greenhouse effect index), good low-temperature fluidity and heat exchange performance, and adopts CO2The transcritical double-stage compression refrigeration cycle can greatly increase the waste heat recovery amount, effectively reduce the optimal exhaust pressure and the corresponding exhaust temperature of the cycle, provide guarantee for the safety of the system and is suitable for being used at a lower environmental temperature.
(3) The solar energy heat supply system can respectively supply heat to the hot water storage tank through the air source heat pump unit and the solar energy heat collection unit, wherein the solar energy heat supply part can directly supply heat through solar energy, so that the heat supply energy consumption is greatly saved.
(4) The double-heat-source composite heat exchange equipment is adopted in the air source heat pump unit, heat in outdoor environment air and heat converted from solar energy can be absorbed simultaneously, the heat collected by the solar energy is supplied to a system for demand, and the defect that the air source is insufficient in heat exchange in a low-temperature environment can be overcome.
In summary, the utility model aims to provide a refrigeration and heating integrated system with a heat storage water tank for supplying heat by coupling waste heat recovery with a solar air source heat pump, which can solve the defect of insufficient heat exchange of the air source heat pump at a lower ambient temperature, can realize waste heat recovery of a refrigeration part, and has the purposes of energy conservation and consumption reduction.
Drawings
FIG. 1 is a schematic flow chart of the system of the present invention.
The system comprises a low-temperature evaporator, a low-pressure compressor, a medium-temperature evaporator, a waste heat load evaporator, a gas valve, a high-pressure compressor, a first three-way valve, a waste heat recovery heat exchanger, a 9-second three-way valve, a condenser, an 11-expansion valve, a flash tank, a 13-first throttling device, a 14-second throttling device, a 15-third throttling device, a 16-first water pump, a 17-hot water storage tank, a 18-double-heat-source compound heat exchange device, a 19-four-way reversing valve, a 20-gas-liquid separator, a 21-heat pump compressor, a 22-heat pump throttling valve, a 23-second water pump, a 24-third water pump, a 25-heat storage water tank, a 26-fourth water pump, a 27-solar heat collector, a 28-fifth water pump and an air treatment device, wherein the 1-low-temperature evaporator, the 2-low-pressure compressor, the 3-medium-temperature evaporator, the 4-waste heat load evaporator, the gas valve, the 6-high-pressure compressor, the 17-first throttling device, the 15-third water pump, the 16-heat pump, the 16-second throttling device, the 16-heat pump, the heat storage water tank, the heat storage tank, the 18-double-heat exchange device, the heat-source compound heat-heat.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example (b):
the utility model relates to a refrigerating and heating integrated system based on waste heat recovery, in particular to a refrigerating and heating integrated system with a heat storage water tank and adopting waste heat recovery and solar air source heat pump for heat supply. As shown in fig. 1, the system mainly consists of two parts, a refrigerating part and a heating part.
In the refrigeration part, a refrigeration circulation loop mainly comprises an evaporator, a compressor, a condenser 10, a waste heat recovery heat exchanger 8, an expansion valve 11 and a flash tank 12, wherein the evaporator comprises a low-temperature evaporator 1, a medium-temperature evaporator 3 and a waste heat load evaporator 4, and the compressor comprises a low-pressure compressor 2 and a high-pressure compressor 6. When the refrigeration compressor is used, a refrigerant absorbs heat in the low-temperature evaporator 1 and is evaporated to refrigerate a refrigeration environment, and then a gaseous refrigerant enters the low-pressure compressor 2 and is compressed to a medium-temperature pressure; meanwhile, the refrigerant of the medium-temperature evaporator 3 absorbs heat and evaporates to refrigerate the refrigeration environment, and the refrigerant is changed into a gaseous refrigerant; the refrigerant in the waste heat load evaporator 4 absorbs heat and evaporates into gaseous refrigerant to increase the load on the evaporator, thereby increasing the refrigerant mass flow rate in the high pressure part of the system and generating more heat in the waste heat recovery heat exchanger 8. As shown in fig. 1, after passing through the low-pressure compressor 2, the gaseous refrigerant sent from the gaseous refrigerant outlet of the low-temperature evaporator 1 is mixed with the gaseous refrigerant sent from the gaseous refrigerant outlets of the intermediate-temperature evaporator 3 and the waste heat load evaporator 4, (also including the gaseous refrigerant sent from the gaseous refrigerant outlet of the flash tank 12 and adjusted by the gas valve 5), and then enters the high-pressure compressor 6 to be compressed into the high-temperature high-pressure gaseous refrigerant, the high-temperature high-pressure refrigerant passes through the first three-way valve 7 to reach the waste heat recovery heat exchanger 8 to exchange heat with the circulating water in the waste heat recovery heat exchanger 8 to heat the circulating water, the refrigerant leaving the waste heat recovery heat exchanger 8 passes through the second three-way valve 9 to enter the condenser 10 to release heat, and discharge the heat to the outdoor ambient atmosphere, and then enters the expansion valve 11 to reduce the pressure to become a gas-liquid mixture, and the gas-liquid mixture is separated in the flash tank 12, the liquid refrigerant flows into the first throttling device 13, the second throttling device 14 and the third throttling device 15 from the flash tank 12 respectively for pressure reduction, and the refrigerant after pressure reduction returns to the low-temperature evaporator 1, the medium-temperature evaporator 3 and the waste heat load evaporator 4 to enter the next cycle. In this embodiment, the first throttling device 13, the second throttling device 14, and the third throttling device 15 may be electronic expansion valves.
In the heating part, a heat storage water tank 17 and an air processing device 29 mainly form a heat supply circulation loop, and a waste heat recovery heat exchanger 8 in the cold supply circulation loop is communicated with the heat storage water tank 17 through a pipeline to form a loop, so that refrigeration and heating integration is realized while refrigeration waste heat recovery is realized. When the waste heat is recovered, the waste heat recovery heat exchanger 8, the first water pump 16 and the hot water storage tank 17 are sequentially connected to form a refrigeration waste heat recovery circulation loop, the circulating water absorbs heat from a refrigerant in a refrigeration part in the waste heat recovery heat exchanger 8, the circulating water enters the hot water storage tank 17 through the first water pump 16 to release heat so as to heat water stored in the hot water storage tank 17, and the circulating water after heat release returns to the waste heat recovery heat exchanger 8 to enter the next circulation. Meanwhile, the hot water storage tank 17, the fifth water pump 28 and the air processing device 29 are connected to form a heat supply circulation loop. When a user needs heating, the fifth water pump 28 is turned on, the hot water stored in the hot water storage tank 17 flows into the heat exchange device in the air processing device 29 through the fifth water pump 28, heat is transferred to the air, the air processing device 29 sends the air with heat absorbed to the user, so that the thermal comfort of the user is improved, and the hot water stored in the heat exchange device in the air processing device 29 flows back to the hot water storage tank 17 to enter the next circulation.
When the heat recovered by the waste heat recovery system is insufficient, in order to meet the heating requirement of a user, the air source heat pump unit and the solar heat collection unit are further arranged on the hot water storage tank 17 in the embodiment. The air source heat pump circulating unit can utilize an air source heat pump to assist heat supply, and a double-heat-source composite heat exchange device 18, a four-way reversing valve 19, a gas-liquid separator 20, a heat pump compressor 21 and a heat pump throttle valve 22 (an expansion valve, a throttle valve or a capillary tube can be adopted) are connected with a hot water storage tank 17 to form an air source heat pump circulating loop. The refrigerant in the double-double heat source composite heat exchange device 19 absorbs heat in outdoor ambient air and evaporates to become a gaseous refrigerant, then the gaseous refrigerant enters the gas-liquid separator 20 through the four-way reversing valve 19 to separate liquid in the gaseous refrigerant, liquid impact is prevented from being caused in the heat pump compressor 21, then the gaseous refrigerant enters the heat pump compressor 21 to be compressed into a high-temperature high-pressure refrigerant, then the high-temperature high-pressure refrigerant reaches the hot water storage tank 17 from the four-way reversing valve 19, the high-temperature high-pressure refrigerant releases heat and liquefies, heat is transferred to water stored in the hot water storage tank 17, the water temperature in the hot water storage tank 17 is increased, and the liquefied refrigerant is depressurized through the heat pump throttling valve 22 and then enters the double-heat source composite heat exchange device 19 to enter the next cycle.
The solar heat collection machine set comprises a solar heat collector 27 and a heat storage water tank 25, when the outdoor environment temperature is low, the efficiency of a pure air source heat pump is low, the heat supply requirement is difficult to meet, solar energy is required to supplement heat for a heat source of the air source heat pump, and a solar energy coupling air source heat pump system is formed, so that the heat absorption capacity is increased, the energy consumption is reduced, and the heat pump system efficiency is improved. The heat storage water tank 25, the fourth water pump 26, and the solar heat collector 27 are connected in sequence to form a solar heat collection circuit. When the outdoor solar energy is sufficient, the fourth water pump 26 is turned on, the water in the hot water storage tank 25 enters the solar heat collector 27 through the fourth water pump 26 to absorb the heat energy converted from the solar energy, and then the water absorbing the heat energy flows into the hot water storage tank 25 to store the heat energy from the solar energy for use when needed. The solar direct heat supply circulation loop is formed by connecting the hot water storage tank 17, the third water pump 24 and the heat storage water tank 25, so that heat can be directly supplied to the hot water storage tank 17 through solar energy. When the third water pump 24 is turned on, the water stored in the thermal storage water tank 25 reaches the thermal storage water tank 17 through the third water pump 24, heat is released, the heat is transferred to the water in the thermal storage water tank 17, and the thermal storage water after heat exchange flows into the thermal storage water tank 25 and enters the next cycle.
Further, the double-heat-source composite heat exchange device 19, the second water pump 23 and the heat storage water tank 25 are connected to form a solar energy coupling air source heat pump heat supplementing circulation loop. When the second water pump 23 is turned on, the water with heat stored in the heat storage water tank 25 reaches the double-heat-source composite heat exchange device 19 through the second water pump 23, the heat storage water exchanges heat with the refrigerant in the heat pump loop, at the moment, the refrigerant in the heat pump loop absorbs the heat from the solar energy and the heat in the outdoor ambient air in the heat storage water at the same time, and the heat storage water after heat exchange enters the heat storage water tank 25 and enters the next cycle.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115200242A (en) * | 2022-08-08 | 2022-10-18 | 上海燃气工程设计研究有限公司 | A constant temperature chiller |
| CN115653734A (en) * | 2022-11-07 | 2023-01-31 | 上海航天智慧能源技术有限公司 | Gas engine heat pump hot water system capable of efficiently operating in low-temperature environment |
| CN116085855A (en) * | 2022-10-13 | 2023-05-09 | 广东支点建筑科技有限公司 | Energy storage system combining PVT (physical vapor transport) with heat exchange circulation module and control method thereof |
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2022
- 2022-03-24 CN CN202220678790.9U patent/CN216924818U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115200242A (en) * | 2022-08-08 | 2022-10-18 | 上海燃气工程设计研究有限公司 | A constant temperature chiller |
| CN116085855A (en) * | 2022-10-13 | 2023-05-09 | 广东支点建筑科技有限公司 | Energy storage system combining PVT (physical vapor transport) with heat exchange circulation module and control method thereof |
| CN115653734A (en) * | 2022-11-07 | 2023-01-31 | 上海航天智慧能源技术有限公司 | Gas engine heat pump hot water system capable of efficiently operating in low-temperature environment |
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