CN106765916B - Temperature control system and temperature control method - Google Patents
Temperature control system and temperature control method Download PDFInfo
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- CN106765916B CN106765916B CN201611115804.1A CN201611115804A CN106765916B CN 106765916 B CN106765916 B CN 106765916B CN 201611115804 A CN201611115804 A CN 201611115804A CN 106765916 B CN106765916 B CN 106765916B
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- 238000000034 method Methods 0.000 title claims description 32
- 238000009825 accumulation Methods 0.000 claims abstract description 167
- 238000005338 heat storage Methods 0.000 claims abstract description 100
- 238000001816 cooling Methods 0.000 claims abstract description 80
- 238000005057 refrigeration Methods 0.000 claims abstract description 63
- 238000010438 heat treatment Methods 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 230000005494 condensation Effects 0.000 claims description 9
- 238000009833 condensation Methods 0.000 claims description 9
- 239000003507 refrigerant Substances 0.000 claims description 9
- 230000035939 shock Effects 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000004134 energy conservation Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 238000004904 shortening Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0017—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/24—Storage receiver heat
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Abstract
The present invention provides a temperature control system comprising: the system also comprises a power device connected with the temperature control device, and the temperature control device comprises a cooling heat exchanger of the cold storage device and a heating heat exchanger of the heat storage device; the cold accumulation device comprises a cold accumulation working medium container and a cold accumulation heat exchanger connected with the cold accumulation working medium container, the cold accumulation heat exchanger is connected with a cooling heat exchanger, the cooling heat exchanger is connected with the cold accumulation working medium container, and the cooling heat exchanger is connected with the power device; the heat storage device comprises a heat storage working medium container and a first exhaust end heat exchanger which is connected with the heat storage working medium container and the power device, and the heat storage working medium container is connected with the heating heat exchanger. The load of a cooling tower and the like is reduced, the temperature of the cold accumulation device is reduced by surplus refrigerating capacity during refrigeration, low-temperature energy is stored, and after the temperature of the cold accumulation device reaches the preset temperature, the refrigeration equipment is cooled, so that the aim of saving energy is fulfilled.
Description
Technical Field
The invention relates to the technical field of temperature control, in particular to a temperature control system and a temperature control method.
Background
So far, most refrigeration equipment adopts a compressor mechanical refrigeration mode. As the temperature approaches the set temperature, the main refrigeration circuit begins to open intermittently and the refrigerant begins to circulate through the thermal bypass. The closer to the set value, the shorter the refrigeration main circuit operation time. During the low temperature holding phase, the compressor is idling most of the time and the refrigerant is mostly circulated through the heat bypass loop, since only a small amount of cooling capacity is required to balance the heat gained by the temperature control system in heat exchange with the ambient environment. The number of revolutions of the compressor motor can be changed by the inverter, which can save energy, but is not popular for various reasons, especially for high-power compressor systems.
Therefore, how to provide a temperature control system with wider application range to save energy becomes a problem to be solved urgently.
Disclosure of Invention
The scheme provides a temperature control system with a wider application range so as to save energy.
The purpose of the scheme is realized by the following technical scheme:
a temperature control system, comprising: the temperature control system also comprises a power device connected with the temperature control device, and the temperature control device internally comprises a cooling heat exchanger of the cold storage device and a heating heat exchanger of the heat storage device; the cold accumulation device comprises a cold accumulation working medium container and a cold accumulation heat exchanger connected with the cold accumulation working medium container, the cold accumulation heat exchanger is connected with a cooling heat exchanger, the cooling heat exchanger is connected with the cold accumulation working medium container, and the cooling heat exchanger is connected with the power device; the heat storage device comprises a heat storage working medium container and a first exhaust end heat exchanger which is connected with the heat storage working medium container and the power device, and the heat storage working medium container is connected with the heating heat exchanger.
Preferably, the system further comprises a low-temperature refrigerating device, the low-temperature refrigerating device comprises a low-temperature condenser connected with the cooling heat exchanger, the low-temperature condenser is connected with the cold accumulation working medium container and the cold accumulation heat exchanger, and a low-temperature compressor is arranged between the cooling heat exchanger and the low-temperature condenser for connection. Therefore, the cooling heat exchanger in the temperature control device can be refrigerated by the low-temperature refrigerating device, and the working efficiency is higher.
Preferably, a humidifying water heat exchanger is further arranged between the heat storage working medium container and the heating heat exchanger for connection, and the humidifying water heat exchanger is used for preheating humidifying water. Therefore, the humidification can be carried out when the humidity in the temperature control device is insufficient.
Preferably, the cold accumulation working medium container comprises a cold accumulation front working medium container and a cold accumulation rear working medium container, the cold accumulation heat exchanger is connected with the cold accumulation rear working medium container, the cooling heat exchanger is connected with the cold accumulation front working medium container, and a cold accumulation working medium pump is arranged between the cold accumulation heat exchanger and the cold accumulation rear working medium container for connection; the system is also provided with a low-temperature condensation heat exchanger connected with the cold accumulation front working medium container. Therefore, the working medium before and after cold accumulation can be separately stored, the management is convenient, and the energy loss is reduced.
Preferably, the heat storage working medium container comprises a working medium container before heat storage and a working medium container after heat storage, the first exhaust end heat exchanger is connected with the working medium container after heat storage, and the heating heat exchanger is connected with the working medium container before heat storage. Therefore, the working medium before heat accumulation and the working medium after cold accumulation can be separately stored, the management is convenient, and the energy loss is reduced.
The temperature control method disclosed by the scheme comprises the following steps:
the cold accumulation device acquires low-temperature energy released by a compressor refrigerating system at the lowest temperature until the cold accumulation device reaches a preset temperature;
detecting the temperature of the temperature control device, and if the temperature of the temperature control device reaches a threshold value, releasing low-temperature energy to the temperature control device by the cold accumulation device through the cooling heat exchanger;
stopping the operation of the high-temperature stage compressor system, refrigerating the low-temperature stage compressor system by the cold accumulation device, and condensing the low-temperature stage refrigerant; or/and
the heat storage device obtains high-temperature energy released by the exhaust end of the compressor;
detecting the temperature in the heat storage device, and if the temperature in the heat storage device reaches the temperature of the exhaust end of the compressor or the temperature of the exhaust end of the compressor is lower than the temperature in the heat storage device, stopping obtaining high-temperature energy by the heat storage device;
and detecting the temperature of the temperature control device, and if the temperature of the temperature control device reaches a threshold value, releasing high-temperature energy to the temperature control device by the heat storage device through the heating heat exchanger.
Preferably, the method further comprises: detecting the humidity of the temperature control device, and if the humidity of the temperature control device reaches a threshold value, releasing low-temperature energy to the temperature control device by the cold accumulation device through the cooling heat exchanger; or/and
and detecting the humidity of the temperature control device, and if the humidity of the temperature control device reaches a threshold value, preheating the humidification water by the heat storage device through the humidification water heat exchanger.
Preferably, if the temperature of the temperature control device reaches the threshold value, the step of releasing the low-temperature energy from the cold storage device to the temperature control device through the cooling heat exchanger further comprises: and stopping the operation of all the compressor systems, and refrigerating the temperature control equipment only by the cold accumulation device.
Preferably, if the temperature of the temperature control device reaches the threshold value, the step of releasing the low-temperature energy from the cold storage device to the temperature control device through the cooling heat exchanger further comprises: and stopping the operation of the cascade compressor, refrigerating the condenser of the low-power compressor system by the cold accumulation device, and refrigerating the temperature control equipment by the evaporator of the low-power compressor system.
Preferably, the method is applied to a thermal shock test box, and the heating heat exchanger or/and the cooling heat exchanger are/is positioned at the inlet of the air duct.
The temperature control system in the scheme comprises: the system also comprises a power device connected with the temperature control device, and the temperature control device comprises a cooling heat exchanger and a heating heat exchanger; the cold accumulation device comprises a cold accumulation working medium container and a cold accumulation heat exchanger connected with the cold accumulation working medium container, the cold accumulation heat exchanger is connected with the cooling heat exchanger, the cooling heat exchanger is connected with the cold accumulation working medium container, and the cooling heat exchanger is connected with the power device; the heat storage device comprises a heat storage working medium container and a first exhaust end heat exchanger which is connected with the heat storage working medium container and the power device, and the heat storage working medium container is connected with the heating heat exchanger. By adopting the mode, the heat storage device can provide heat from the exhaust end of the refrigeration compressor, in the refrigeration operation process, the heat storage working medium absorbs and stores the heat of the exhaust end of the refrigeration compressor through the first exhaust end heat exchanger arranged on the power device, and then when the heat is required to be heated, the working medium in the heat storage device is used for heating, so that the loads of systems such as a cooling tower and the like are reduced, and the purpose of energy conservation is achieved; the cold accumulation device reduces the temperature by surplus refrigerating capacity during refrigeration, stores low-temperature energy, and can selectively cool the refrigeration equipment after the temperature of the cold accumulation device reaches the preset temperature, thereby achieving the purpose of energy conservation. The load of systems such as a cooling tower is reduced, the temperature of the cold accumulation device is reduced by surplus refrigerating capacity during refrigeration, the refrigeration system of the temperature control equipment can be started before the temperature control of the temperature control equipment is started, the cold accumulation system is cooled independently, low-temperature energy is stored, and after the temperature of the cold accumulation device reaches the preset temperature, the refrigeration equipment is cooled, so that the purpose of energy conservation is achieved.
Drawings
FIG. 1 is an exemplary diagram of a temperature control system provided by embodiments of the present invention;
FIG. 2 is an exemplary diagram of another temperature control system provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of yet another temperature control system provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of yet another temperature control system provided by an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a cold storage device provided by an embodiment of the invention;
FIG. 6 is a schematic configuration diagram of a thermal storage device provided by an embodiment of the invention;
fig. 7 is a schematic structural view of another cold storage device provided by the embodiment of the invention;
fig. 8 is a schematic view of a connection structure of a cold storage working medium container provided by an embodiment of the invention;
fig. 9 is a schematic diagram of a connection structure of a heat storage working medium container according to an embodiment of the present invention.
Wherein: 1-a cold accumulation working medium container, 2-a cold accumulation working medium temperature sensor, 3-a cooling loop valve, 4-a cold accumulation working medium pump, 5-a temperature control device loop valve, 6-a temperature control device, 7-a temperature reduction heat exchanger, 8-a temperature control device main refrigeration loop valve, 9-a cooling loop valve, 10-a first compressor, 11-a first condenser, 12-a first exhaust end heat exchanger, 13-a heat absorption loop valve, 14-a heat accumulation working medium pump, 15-a heat accumulation working medium container, 16-a heat accumulation working medium temperature sensor, 17-a heating loop valve, 18-a heating heat exchanger, 19-a main evaporator, 20-a cold accumulation heat exchanger, 21-a low temperature compressor, 22-a low temperature main loop valve, 23-a low temperature condenser, 24-a compressor loop valve, 25-low temperature level condensation heat exchanger, 26-high temperature level main refrigeration loop valve, 27-second compressor, 28-second exhaust end heat exchanger, 29-humidification loop valve, 30-humidification water heat exchanger, 31-second condenser, 33-cold accumulation rear working medium container, 34-cold accumulation front working medium container, 35-cold accumulation rear container valve, 36-cold accumulation front working medium container valve, 37-heat accumulation rear working medium container, 38-heat accumulation front working medium container, 39-heat accumulation rear container valve, 40-humidification heat exchanger loop valve, 41-heat accumulation front container valve.
Detailed Description
In the description of the present embodiment, it is to be understood that the terms "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present embodiment and simplifying the description, but do not indicate or imply that the device or element referred to has a specific orientation, is configured and operated in a specific orientation, and thus, is not to be construed as limiting the present embodiment. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present embodiment, "a plurality" means two or more unless otherwise specified. Furthermore, the term "comprises" and any variations thereof is intended to cover non-exclusive inclusions.
In the description of the present embodiment, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the present embodiment can be understood as specific cases by those of ordinary skill in the art.
The present embodiment will be further described with reference to the drawings and the preferred embodiments.
As shown in fig. 1, the present embodiment discloses a temperature control system, which includes: the system comprises a cold accumulation device, a heat accumulation device and a temperature control device 6, wherein the cold accumulation device and the heat accumulation device are both connected with the temperature control device 6, the system also comprises a power device connected with the temperature control device 6, and the temperature control device 6 comprises a cooling heat exchanger 7 and a heating heat exchanger 18; the cold accumulation device comprises a cold accumulation working medium container 1 and a cold accumulation heat exchanger 20 connected with the cold accumulation working medium container 1, the cold accumulation heat exchanger 20 is connected with a cooling heat exchanger 7, the cooling heat exchanger 7 is connected with the cold accumulation working medium container 1, and the cooling heat exchanger 7 is connected with the power device; the heat storage device comprises a heat storage working medium container 15 and a first exhaust end heat exchanger 12 connecting the heat storage working medium container 15 and the power device, wherein the heat storage working medium container 15 is connected with a heating heat exchanger 18.
By adopting the mode, the heat storage device can provide heat from the exhaust end of the refrigeration compressor, in the process of refrigeration operation, the heat storage working medium absorbs and stores the heat of the exhaust end of the refrigeration compressor through the first exhaust end heat exchanger 12 arranged on the power device, and then when the heat is needed to be heated, the working medium in the heat storage device is used for heating, so that the loads of systems such as a cooling tower and the like are reduced, and the purpose of energy conservation is achieved; the cold accumulation device reduces the temperature by surplus refrigerating capacity during refrigeration, stores low-temperature energy, and can selectively cool the refrigeration equipment after the temperature of the cold accumulation device reaches the preset temperature, thereby achieving the purpose of energy conservation.
In the embodiment, as shown in fig. 1, the temperature control device 6 further includes a main evaporator 19, the power device includes a first compressor 10, the main evaporator 19 is connected to the first compressor 10, the power device is further provided with a first condenser 11 connected to the first compressor 10, the first condenser 11 is connected to the main evaporator 19, and the cold storage heat exchanger 20 is connected to both the first condenser 11 and the main evaporator 19. The surplus refrigeration capacity during refrigeration can be stored in the cold storage device through the cold storage heat exchanger, so that the waste of energy during refrigeration is reduced, the cold storage device is used after being used, and the cold storage device is energy-saving and environment-friendly. For a single stage compressor refrigeration system, the method shown in fig. 2 may be employed.
Specifically, the temperature control system includes: the cold accumulation working medium comprises a cold accumulation working medium container 1, a cold accumulation working medium temperature sensor 2, a first cooling loop valve 3, a cold accumulation working medium pump 4, a temperature control device loop valve 5, a temperature control device 6, a cooling heat exchanger 7 in the temperature control device 6, a temperature control device main refrigeration loop valve 8, a second cooling loop valve 9, a first compressor 10, a first condenser 11, a first exhaust end heat exchanger 12, a heat absorption loop valve 13, a heat accumulation working medium pump 14, a heat accumulation working medium container 15, a heat accumulation working medium temperature sensor 16, a heating loop valve 17, a heating heat exchanger 18 in the temperature control device 6, a main evaporator 19 of a refrigeration loop and a cold accumulation heat exchanger 20, and the working mode can be that a multi-stage cascade compressor system is arranged, namely, the power device can comprise a plurality of compressors.
In the embodiment, as shown in fig. 3, 5 and 6, the power plant further includes a second compressor 27, the heat storage device includes a second exhaust heat exchanger 28 connecting the heat storage working medium container 15 and the second compressor 27, the second compressor 27 is connected to the first condenser 11, and the power plant is provided with a second condenser 31 connecting the second compressor 27 and the first condenser 11. The second compressor 27 and the second condenser 31 are added, so that the speed of storing energy by the heat storage device and the cold storage device can be increased, and the working efficiency can be improved. The power plant comprises a first compressor and a second compressor, namely the power plant is a cascade compressor system, the temperature can be reduced to a lower temperature, and the degree of the temperature can be reduced is determined by the characteristics of refrigerants, for example, the refrigerants have two categories of-40 ℃ and-70 ℃, but the refrigerant of-70 ℃ can be condensed into liquid only at about-20 ℃, so that the cascade system is invented, a high-temperature-stage system is made of the refrigerant capable of being condensed into liquid at normal temperature, the high-temperature-stage system cools a low-temperature-stage system, and finally the low-temperature-stage system cools temperature control equipment, so that which system is used is determined by the application of the temperature control equipment, and a low-power low-temperature-stage system can be added for the single-stage system.
A humidifying water heat exchanger 30 is arranged between the heat storage working medium container 15 and the heating heat exchanger 20 for connection, and a humidifying loop valve 29 is arranged between the humidifying water heat exchanger 30 and the heating heat exchanger 20 for connection, so that humidification can be performed when the humidity in the temperature control device 6 is insufficient. When there is a humidification system and humidification is required, the humidification heat exchanger loop valve 29 is opened to allow the high temperature working fluid to flow to the humidification water heat exchanger 30, preheating the humidification water to flow to the humidification heater.
Specifically, the temperature control system includes: a second exhaust end heat exchanger 28, a heat absorption loop valve 13, a heat storage working medium pump 14, a heat storage working medium temperature sensor 16, a heat storage working medium container 15, a heating loop valve 17, a first exhaust end heat exchanger 12 and a heating heat exchanger 18 in the temperature control device 6.
When the temperature control device 6 starts to cool, the heat absorption loop valve 13 is opened, the heat storage working medium pump 14 drives the working medium to the second exhaust end heat exchanger 28 and the first exhaust end heat exchanger 22 to absorb the heat of the exhaust temperature until the temperature measured by the heat storage working medium temperature sensor 16 in the heat storage working medium container 15 reaches the exhaust temperature or the exhaust temperature of the compressor starts to drop. Because the exhaust temperatures of the compressors of different stages are different, the cascade units can also be respectively controlled by adding valves in different heat absorption loops. When the temperature control device 6 needs to be heated, the heating loop valve 17 is opened, and the working medium pump drives the hot working medium to the heating heat exchanger 18 in the temperature control device 6 to heat the interior of the temperature control device 6.
The temperature control system further comprises: the system comprises a cold accumulation device container 1, a cold accumulation device working medium temperature sensor 2, a first cooling loop valve 3, a cold accumulation working medium pump 4, a temperature control device loop valve 5, a compressor loop valve 24, a cooling heat exchanger 7 in a temperature control device 6, a low-temperature level condensation heat exchanger 25 and a cold accumulation heat exchanger 20; and the temperature control device 6, the temperature control device main refrigeration loop valve 8, the second cooling loop valve 9, the first condenser 11, the high-temperature-stage main refrigeration loop valve 26, the second compressor 27, the second condenser 31, the first compressor 10 and the main evaporator 19. Wherein the first compressor 10 may be a low temperature stage compressor and the second compressor 27 may be a high temperature stage compressor.
No matter the refrigerating system of the system consists of several stages of systems, the heat exchanger of the cold accumulation device is cooled by the refrigerating system of the lowest temperature compressor, and the selection of the cold accumulation working medium is matched with the refrigerating capacity. And the cooling is performed by the surplus cooling capacity only under the condition that the cooling power in the temperature control device 6 is not full load cooling. When the temperature in the temperature control device 6 is close to the set temperature and the refrigeration power is adjusted, the second cooling loop valve 9 is opened only when the main refrigeration loop valve 8 of the temperature control device is closed, and the cold storage working medium is cooled until the temperature measured by the cold storage working medium temperature sensor 2 reaches the set value.
The refrigeration scheme of the cooling heat exchanger 7 in the temperature control device 6 or the refrigeration scheme of the low-temperature-level condensation heat exchanger 25 depends on the set temperature in the temperature control device 6. If the set temperature in thermostat 6 is close to the cryogenic temperature limit of thermostat 6, the latter is better used for the cooling scheme by cryogenic stage condensing heat exchanger 25. Although the whole refrigeration compressor system can be shut down by adopting the former, the lowest temperature of the cold accumulation device is also the low-temperature limit of the whole temperature control device 6, so that the temperature difference between the cold accumulation device and the set temperature is too small, the whole compressor system can be frequently started, and the whole compressor system is not used for refrigerating only a low-temperature stage condenser heat exchanger, and finally the low-temperature stage compressor system is used for refrigerating the temperature control device 6.
When the cold storage device reaches the cold storage device set temperature, the temperature control device 6 is also substantially stabilized at the set temperature, and at this time, a large cooling capacity is not required, but only a thermal balance is required to maintain the temperature. The cold storage device can be used to: 1) the refrigeration system of the temperature control device 6 can be stopped, then only the loop valve 5 of the temperature control device of the cold accumulation device is opened, and the cold accumulation working medium is driven by the cold accumulation working medium pump 4 to the heat exchanger 8 in the temperature control device to replace the refrigeration system of the temperature control device 6 to refrigerate. 2) Or the high-temperature compressor system is stopped, then a compressor loop valve 24 of the cold accumulation device system is opened, the cold accumulation working medium is driven by the working medium pump to the low-temperature condensation heat exchanger 25, and the cold accumulation device replaces the high-temperature compressor refrigeration system to work.
As shown in fig. 5, at the inlet of the cold box air duct, a heat exchanger is provided. After the experimental product enters the cold box from the hot box, the cooled cold accumulation working medium of the cold accumulation device enters the heat exchanger under the driving of the pump, and exchanges heat with the air in the cold box before the evaporator of the temperature control device 6 of the cold box, so that the heat brought from the hot box is absorbed, the refrigeration load of the temperature control device is reduced, and the purpose of shortening the recovery time is achieved. When the temperature of the cold accumulation working medium is the same as the temperature of the air in the cold box, the working medium pump of the cold accumulation device is stopped, and the evaporator of the cold box is used for refrigeration completely.
As shown in fig. 6, at the inlet of the hot box air duct, a heat exchanger is provided. If the set temperature of the hot box is higher than the temperature of the working medium of the heat storage device, when the experimental product is in the cold box, the working medium pump of the heat storage device is started, the working medium heated by the exhaust end of the compressor enters the heat exchanger 2 in the hot box, and the heating is continued by the heater of the hot box. After the experimental product enters the hot box from the cold box, the heat storage working medium of the heat storage device enters the heat exchanger under the driving of the pump, and exchanges heat with the air in the hot box in advance in the heater of the hot box, so that the cold energy brought by the cold box is absorbed, and the purpose of shortening the recovery time is achieved. When the temperature of the working medium of the heat storage device is the same as the temperature of the air in the hot box, the heat storage working medium pump 14 is stopped, and the heating is completely performed by the heater of the hot box.
In the embodiment, as shown in fig. 4, a method of adding a low-power low-temperature stage compressor system to a high-power stacked unit may also be adopted, the low-power compressor unit is only a power-reduced version of the stacked lowest-temperature stage system, and the compressor motor may be equipped with a frequency converter. The low power compressor system includes: a cooling heat exchanger 7, a low-temperature compressor 21, a low-temperature main loop valve 22 and a low-temperature condenser 23. The cold storage device accordingly reduces the circuit of the temperature control device valve 5 and the temperature reducing heat exchanger 7 of fig. 3. In other words, the heat exchanger in the temperature control device is not cooled by the cold accumulation working medium any more, but is cooled by the low-power compressor system. The compressor loop valve 24 of the cold storage device, the low temperature stage condensing heat exchanger 25, is modified to not refrigerate for the cascade low temperature stage compressor condenser, but for the low power compressor system.
For a high-power compressor unit, in the temperature maintaining stage, even if only a low-temperature stage compressor is started, the power consumption is high. At the moment, a method of replacing a high-power low-temperature stage compressor by a low-power compressor unit is adopted, so that the aim of saving energy is fulfilled.
In the embodiment, as shown in fig. 2, the system further includes a low-temperature refrigeration device, the low-temperature refrigeration device includes a low-temperature condenser 23 connected to the cooling heat exchanger 7, the low-temperature condenser 23 is connected to both the cold storage working medium container 1 and the cold storage heat exchanger 20, and a low-temperature compressor 21 is provided between the cooling heat exchanger 7 and the low-temperature condenser 23 for connection. Therefore, the cooling heat exchanger in the temperature control device 6 can be refrigerated by the low-temperature refrigerating device, and the working efficiency is higher.
For the temperature control system described above in fig. 1 that employs a single stage compressor system, it is desirable to employ the configuration shown in fig. 2 when operating near the low temperature limit for extended periods of time, adding a low capacity low temperature stage compressor system.
The low power low temperature stage refrigeration system includes: a cooling heat exchanger 7, a low-temperature compressor 21, a low-temperature main loop valve 22 and a low-temperature condenser 23 in the temperature control device 6. At this moment, the cold accumulation device does not refrigerate and cool the interior of the temperature control device 6 any more, but is used as a cold source of a condenser of the low-temperature stage compressor system, and at this moment, the temperature of the cold accumulation device is not suitable for cooling the temperature control device 6, but is suitable for cooling the low-temperature stage system to condense the low-temperature stage system because the refrigerating temperature of the low-temperature stage can be very low. The single-stage compressor system is used for refrigerating at the initial stage of the refrigeration of the temperature control device 6, and part of the refrigeration is started to refrigerate the cold accumulation device when the set value accessory is reached. When the temperature control device 6 is substantially stabilized at the set value, the cold storage device also substantially reaches the set value. At this point, the large single stage compressor is turned off and the low power, low temperature stage compressor is started to maintain the temperature inside thermostat 6.
The cold storage device and the heat storage device can also be used for multi-zone temperature control of different set temperatures inside the temperature control device 6. For example, when the temperature control device 6 has a plurality of regions therein and the temperature of each region is set to be different, cooling or heating can be performed by the cold storage device or the heat storage device. And multi-region different temperature control is realized.
For the thermal shock test chamber, when the cold and hot temperature conversion is carried out, the recovery time of the temperature is one of indexes for measuring the performance of the thermal shock test chamber. Now, the recovery time is shortened mainly by increasing the heating and cooling power. By introducing the cold accumulation device and the heat accumulation device, the purpose of shortening the recovery time can be achieved under the condition of not increasing the heating and refrigerating power.
In the present embodiment, as exemplified in connection with fig. 7, the cold storage working medium container 1 is in the same container as the cold storage heat exchanger 20. Therefore, the size of the system can be reduced, the space is saved, and the installation is convenient. The cold accumulation working medium container 1 can be combined with the cold accumulation heat exchanger 20, thus reducing one loop and achieving the purpose of saving cost. The cold accumulation heat exchanger 20 is positioned in the cold accumulator working medium container 1, and the temperature in the cold accumulator can be uniform by means of natural convection or forced circulation of an internal working medium pump. The system comprises a cold accumulation working medium pump 4, a temperature control device loop valve 5, a compressor loop valve 24, a low-temperature grade condensation heat exchanger 25, a cooling heat exchanger 7, a cold accumulation working medium temperature sensor 2, a cold accumulation heat exchanger 20 and a cold accumulation working medium container 1.
In the present embodiment, as shown in fig. 8, the cold storage working medium container 1 includes a cold storage front working medium container 34 and a cold storage rear working medium container 33, the cold storage heat exchanger 20 is connected to the cold storage rear working medium container 33, the cooling heat exchanger 7 is connected to the cold storage front working medium container 34, and a cold storage working medium pump 4 is arranged between the cold storage heat exchanger 20 and the cold storage rear working medium container 33 for connection; the system is also provided with a low-temperature condensation heat exchanger 25 connected with a cold accumulation front working medium container 34. Therefore, the working medium before and after cold accumulation can be separately stored, the management is convenient, and the energy loss is reduced. The cold storage working medium can be respectively placed into different containers before and after cold storage, so that the cold storage working medium with low temperature can be obtained as soon as possible, and the amount of the cold storage working medium can be selected according to subsequent cold load. If the cold accumulation is finished in a short time, only a small amount of cold accumulation working medium can be accumulated. The system specifically comprises a cold accumulation rear working medium container 33 (with a temperature sensor), a cold accumulation rear container valve 35, a cold accumulation working medium pump 4, a first cooling loop valve 3, a cold accumulation heat exchanger 20, a low-temperature level condensation heat exchanger 25, a cooling heat exchanger 7, a temperature control device loop valve 5, a compressor loop valve 24, a cold accumulation front working medium container valve 36 and a cold accumulation front working medium container 34.
In the cold accumulation process, the working medium container valve 36 before cold accumulation is opened, the first cooling loop valve 3 is opened, the cold accumulation working medium pump 4 sends the cold accumulation working medium of the working medium container 34 before cold accumulation to the cooling heat exchanger 7 for cooling, and the cooled cold accumulation working medium enters the cold accumulation after working medium container 33 for storage. When the cold accumulation device starts to perform refrigeration, the container valve 35 after cold accumulation and the corresponding temperature control equipment loop valve 5 or the compressor loop valve 24 are opened to perform corresponding refrigeration.
In the present embodiment, as exemplified in connection with fig. 9, the heat storage working medium container 15 includes a pre-heat-storage working medium container 38 and a post-heat-storage working medium container 37, the first exhaust-side heat exchanger 12 is connected to the post-heat-storage working medium container 37, and the heating heat exchanger 18 is connected to the pre-heat-storage working medium container 38. Therefore, the working medium before heat accumulation and the working medium after cold accumulation can be separately stored, the management is convenient, and the energy loss is reduced. The heat storage working medium can be placed in different containers before and after heat storage, so that the high-temperature heat storage working medium can be obtained as soon as possible. The method specifically comprises the following steps: a working medium container 37 (with a temperature sensor) after heat storage, a container valve 39 after heat storage, a heat storage working medium pump 14, a heat absorption loop valve 13, a first exhaust end heat exchanger 12, a heating heat exchanger 18, a humidifying water heat exchanger 30, a humidifying heat exchanger loop valve 40, a heating loop valve 17, a container valve 41 before heat storage and a working medium container 38 before heat storage.
In the heat storage process, the container valve 41 before heat storage and the heat absorption loop valve 13 are opened, the heat storage working medium is pumped to the first exhaust end heat exchanger 12 from the working medium container 38 before heat storage by the heat storage working medium pump 14 for heating, and the heated working medium is sent to the working medium container 37 after heat storage for storage. When the heat accumulator heats up, the container valve 39 after heat accumulation and the corresponding humidifying heat exchanger loop valve 40 or heating loop valve 17 are opened to perform heating work.
In the embodiment, the refrigeration efficiency of the compressor is improved, and by introducing the cold accumulator, when the temperature control device does not need full-power refrigeration, the compressor refrigeration system still carries out full-power refrigeration, and on the premise of ensuring the refrigeration of the temperature control device, redundant refrigeration capacity is used for refrigerating the cold accumulator. Therefore, when the cold accumulator reaches the set temperature, the temperature control equipment can be stabilized at the set temperature, and only the refrigeration system needs to refrigerate with small power at the moment. At this time, the temperature control equipment can be refrigerated only by the cold accumulator system by closing the compressor of the whole mechanical refrigeration system; or a part of compressors, such as a high-temperature stage compressor, is closed, and the cold accumulator system replaces the high-temperature stage compressor to refrigerate the condenser of the low-temperature stage refrigeration system, so that the aim of saving energy is fulfilled.
The regenerator can also be used in devices for controlling temperature and humidity. In the humidity maintaining and dehumidifying stage, the required refrigerating capacity can be controlled by the heat exchanger in the temperature control equipment according to the method.
Some temperature control devices need to switch between high temperature and low temperature, or stop the machine after the temperature is raised to normal temperature although the temperature is kept low. The exhaust temperature of the mechanical refrigeration compressor is relatively high, and the cooling water is required to carry away heat to be condensed. The heat accumulator is introduced to absorb and store part of heat of the exhaust gas of the compressor, and the part of stored heat is used for heating when the temperature control equipment needs to be heated. The temperature control equipment is heated to high temperature by an electric heating method, and the heat accumulator is firstly utilized for heating, so that electric energy is saved, and the refrigerating pressure of the cooling tower is also reduced.
According to one embodiment, the present embodiment discloses a temperature control method, including:
the cold accumulation device acquires low-temperature energy released by a compressor refrigeration system at the lowest temperature until the cold accumulation device reaches a preset temperature, wherein the compressor refrigeration system is operated at full power;
detecting the temperature of the temperature control device, and if the temperature of the temperature control device reaches a threshold value, releasing low-temperature energy to the temperature control device by the cold accumulation device through the cooling heat exchanger;
stopping the operation of the high-temperature stage compressor system, and refrigerating the low-temperature stage compressor system by the cold accumulation device to condense the low-temperature stage refrigerant; or/and
the heat storage device obtains high-temperature energy released by the exhaust end of the compressor;
detecting the temperature in the heat storage device, and if the temperature in the heat storage device reaches the temperature of the exhaust end of the compressor or the temperature of the exhaust end of the compressor is lower than the temperature in the heat storage device, stopping obtaining high-temperature energy by the heat storage device;
and detecting the temperature of the temperature control device, and if the temperature of the temperature control device reaches a threshold value, releasing high-temperature energy to the temperature control device by the heat storage device through the heating heat exchanger.
When the temperature control device reaches the preset temperature and the refrigeration system starts to adjust the refrigeration power, namely the refrigeration is carried out on the cold accumulation device when the valve of the main evaporator is closed, or the refrigeration is carried out on the cold accumulation device specially before the temperature control device operates, so that the compressor system can operate at full power as far as possible.
According to one example thereof, the method further comprises: detecting the humidity of the temperature control device, and if the humidity of the temperature control device reaches a threshold value, releasing low-temperature energy to the temperature control device by the cold accumulation device through the cooling heat exchanger; or/and
and detecting the humidity of the temperature control device, and if the humidity of the temperature control device reaches a threshold value, preheating the humidification water by the heat storage device through the humidification water heat exchanger.
According to one example, the step of releasing the low-temperature energy from the cold storage device to the temperature control device through the cooling heat exchanger if the temperature of the temperature control device reaches the threshold value further comprises: and stopping the operation of all the compressor systems, and refrigerating the temperature control equipment only by the cold accumulation device.
According to one example, the step of releasing the low-temperature energy from the cold storage device to the temperature control device through the cooling heat exchanger if the temperature of the temperature control device reaches the threshold value further comprises: and stopping the operation of the cascade compressor, refrigerating the condenser of the low-power compressor system by the cold accumulation device, and refrigerating the temperature control equipment by the evaporator of the low-power compressor system.
According to one example, the method is applied to a thermal shock test chamber, and the heating heat exchanger or/and the cooling heat exchanger are/is located at the inlet of an air duct.
For other descriptions of the method in this embodiment, reference may be made to the embodiment of the system described above, and details are not repeated.
The above description is a detailed description of the present embodiment with reference to specific preferred embodiments, and it should not be construed that the specific implementations of the present embodiment are limited to these descriptions. For those skilled in the art to which the embodiment belongs, a few simple deductions or substitutions can be made without departing from the concept of the embodiment, and all of them should be considered as belonging to the protection scope of the embodiment.
Claims (9)
1. A temperature control method which is a temperature control method of a temperature control system, characterized in that the temperature control system comprises: the temperature control system also comprises a power device connected with the temperature control device, and the temperature control device internally comprises a cooling heat exchanger of the cold storage device and a heating heat exchanger of the heat storage device; the cold accumulation device comprises a cold accumulation working medium container and a cold accumulation heat exchanger connected with the cold accumulation working medium container, the cold accumulation heat exchanger is connected with a cooling heat exchanger, the cooling heat exchanger is connected with the cold accumulation working medium container, and the cooling heat exchanger is connected with the power device; the heat storage device comprises a heat storage working medium container and a first exhaust end heat exchanger for connecting the heat storage working medium container and the power device, the heat storage working medium container is connected with the heating heat exchanger,
the temperature control method comprises the following steps: the cold accumulation device acquires low-temperature energy released by a compressor refrigeration system at the lowest temperature until the cold accumulation device reaches a preset temperature; detecting the temperature of the temperature control device, and if the temperature of the temperature control device reaches a threshold value, releasing low-temperature energy to the temperature control device by the cold accumulation device through the cooling heat exchanger; stopping the operation of the high-temperature stage compressor system, and refrigerating the low-temperature stage compressor system by the cold accumulation device to condense the low-temperature stage refrigerant; or/and the heat storage device obtains high-temperature energy released by the exhaust end of the compressor; detecting the temperature in the heat storage device, and if the temperature in the heat storage device reaches the temperature of the exhaust end of the compressor or the temperature of the exhaust end of the compressor is lower than the temperature in the heat storage device, stopping obtaining high-temperature energy by the heat storage device; and detecting the temperature of the temperature control device, and if the temperature of the temperature control device reaches a threshold value, releasing high-temperature energy to the temperature control device by the heat storage device through the heating heat exchanger.
2. The temperature control method according to claim 1, wherein the temperature control system further comprises a low-temperature refrigerating device, the low-temperature refrigerating device comprises a low-temperature condenser connected with a cooling heat exchanger, the low-temperature condenser is connected with both the cold storage working medium container and the cold storage heat exchanger, and a low-temperature compressor is arranged between the cooling heat exchanger and the low-temperature condenser.
3. The temperature control method according to claim 1, wherein a humidifying water heat exchanger is further arranged between the heat storage working medium container and the heating heat exchanger for preheating humidifying water.
4. The temperature control method according to claim 1, wherein the cold accumulation working medium container comprises a cold accumulation front working medium container and a cold accumulation rear working medium container, the cold accumulation heat exchanger is connected with the cold accumulation rear working medium container, the cooling heat exchanger is connected with the cold accumulation front working medium container, and a cold accumulation working medium pump connection is arranged between the cold accumulation heat exchanger and the cold accumulation rear working medium container; the system is also provided with a low-temperature condensation heat exchanger connected with the working medium container before cold accumulation.
5. The temperature control method according to claim 1, wherein the heat storage working medium container includes a pre-heat storage working medium container and a post-heat storage working medium container, the first exhaust-side heat exchanger is connected to the post-heat storage working medium container, and the heating heat exchanger is connected to the pre-heat storage working medium container.
6. The temperature control method according to claim 1, characterized in that the temperature control method further comprises: detecting the humidity of the temperature control device, and if the humidity of the temperature control device reaches a threshold value, releasing low-temperature energy to the temperature control device by the cold accumulation device through the cooling heat exchanger; or/and detecting the humidity of the temperature control device, and if the humidity of the temperature control device reaches a threshold value, preheating the humidifying water by the heat storage device through the humidifying water heat exchanger.
7. The temperature control method according to claim 1, wherein the step of releasing the low-temperature energy from the cold storage device to the temperature control device through the cooling heat exchanger if the temperature of the temperature control device reaches the threshold value further comprises: and stopping the operation of all the compressor systems, and refrigerating the temperature control equipment only by the cold accumulation device.
8. The temperature control method according to claim 1, wherein the step of releasing the low-temperature energy from the cold storage device to the temperature control device through the cooling heat exchanger if the temperature of the temperature control device reaches the threshold value further comprises: and stopping the operation of the cascade compressor, refrigerating the condenser of the low-power compressor system by the cold accumulation device, and refrigerating the temperature control equipment by the evaporator of the low-power compressor system.
9. The temperature control method according to claim 1, wherein the temperature control method is applied to a thermal shock test chamber, and the heating heat exchanger or/and the cooling heat exchanger is/are positioned at an inlet of an air duct.
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| JP3856572B2 (en) * | 1998-08-18 | 2006-12-13 | 株式会社ヤマト | Heat storage system |
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| EP1614980A2 (en) * | 2004-07-07 | 2006-01-11 | SANYO ELECTRIC Co., Ltd. | Refrigeration system |
| CN103807939A (en) * | 2012-11-14 | 2014-05-21 | 刘敏奇 | Four-season uninterrupted air conditioning equipment for user timing starting of cold storage and heat storage |
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