CN112965547A - Temperature control system and temperature control method - Google Patents
Temperature control system and temperature control method Download PDFInfo
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Abstract
The invention relates to the technical field of heat exchange, and provides a temperature control system and a temperature control method. A temperature control system, comprising: the refrigerating system comprises a first refrigerating system and a circulating system, the first refrigerating system comprises a first compressor, a heat release side of a third heat exchanger, a first throttling part and a heat absorption side of the first heat exchanger which are connected to form a cycle, the second refrigerating system comprises a second compressor, a heat release side of a fourth heat exchanger, a throttling device and a heat absorption side of a fifth heat exchanger which are connected to form a first cycle branch, and the second refrigerating system comprises a second compressor, a heat release side of a fourth heat exchanger, a throttling device and a heat absorption side of a third heat exchanger which form a second cycle branch; the circulating system comprises a water tank and a heater arranged in the water tank, and the heat release side of the water tank, the load device and the first heat exchanger is connected with the heat release side of the fifth heat exchanger to form circulation. The temperature control system provided by the invention has the advantages that the structure is simple, the stability of the system is improved, and the temperature regulation and control effect is good.
Description
Technical Field
The invention relates to the technical field of heat exchange, in particular to a temperature control system and a temperature control method.
Background
With the increasing complexity of semiconductor technology and the decreasing temperature requirement, the semiconductor temperature control system can realize the requirement of ultralow temperature (such as-80 ℃) through a cascade system. In order to better control the temperature and save energy, the temperature interval is divided into a high-temperature section and a low-temperature section according to the temperature control requirement of the circulating liquid. Only a high-temperature-level refrigerating system is operated in the high-temperature section, and a high-temperature-level and low-temperature-level refrigerating system, namely a cascade system, is required to be operated in the low-temperature section. In the related art, the structure of the cascade system is complex, and the operation of the system is not stable enough, so that the problem needs to be solved urgently.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the temperature control system provided by the invention has the advantages that the structure is simple, the energy consumption of equipment is reduced, the stability of the system is improved, and the temperature control effect is good.
The invention also provides a temperature control method.
A temperature control system according to an embodiment of the first aspect of the present invention includes:
the refrigerating system comprises a first refrigerating system and a second refrigerating system, wherein the first refrigerating system comprises a first compressor, a heat release side of a third heat exchanger, a first throttling part and a heat absorption side of the first heat exchanger which are connected to form a cycle, the second refrigerating system comprises a second compressor, a heat release side of a fourth heat exchanger, a throttling device and a heat absorption side of a fifth heat exchanger which are connected to form a first cycle branch, and the second refrigerating system also comprises a second compressor, a heat release side of a fourth heat exchanger, a throttling device and a heat absorption side of a third heat exchanger which form a second cycle branch;
and the circulating system comprises a water tank and a heater arranged in the water tank, and the water tank, the load device and the heat release side of the first heat exchanger are connected with the heat release side of the fifth heat exchanger to form circulation.
According to one embodiment of the invention, the first refrigeration system further comprises a second heat exchanger, and the heat-releasing side of the third heat exchanger is connected between the heat-releasing side of the second heat exchanger and the heat-absorbing side of the first heat exchanger.
According to one embodiment of the invention, a first valve is arranged between the heat radiation side of the fourth heat exchanger and the heat absorption side of the third heat exchanger, and a second valve is arranged between the heat radiation side of the fourth heat exchanger and the heat absorption side of the fifth heat exchanger.
According to one embodiment of the invention, the throttling means comprises a second throttling element provided between the first valve and the heat absorption side of the third heat exchanger and a third throttling element provided between the second valve and the heat absorption side of the fifth heat exchanger.
According to one embodiment of the invention, the heat absorption side of the second heat exchanger is in communication with the plant side; and/or the heat absorption side of the fourth heat exchanger is communicated with the plant side.
According to one embodiment of the present invention, a first pressure sensor is connected to an inlet end of the second compressor; and the outlet end of the second compressor is connected with a second pressure sensor.
According to one embodiment of the invention, a first temperature sensor is connected to the outlet end of the water tank;
the inlet end of the water tank is connected with a third temperature sensor;
the inlet end of the heat-releasing side of the fifth heat exchanger is connected with a second temperature sensor;
and/or the inlet end of the heat absorption side of the first heat exchanger is connected with a fourth temperature sensor.
The temperature control method according to the embodiment of the second aspect of the invention is applied to the temperature control system, and comprises the following steps:
the temperature of circulating liquid in the circulating system is a first temperature, and second circulating branches of the first refrigerating system and the second refrigerating system are both opened;
the method comprises the steps that the circulating liquid is increased from a first temperature to a second temperature, the first refrigeration system and the second refrigeration system are both closed, the heater is started until the temperature of the circulating liquid reaches a third temperature, and a first circulating branch of the second refrigeration system is started, wherein the temperature of the circulating liquid reaches the third temperature, and the suction pressure and the exhaust pressure of the second compressor both reach the working pressure of the second compressor.
According to an embodiment of the invention, the first temperature, the second temperature and the third temperature are all temperatures of the circulating liquid at the outlet end of the water tank.
According to an embodiment of the present invention, the temperature of the circulating liquid reaches a third temperature, the second valve of the first circulating branch is opened, the third throttling element is opened, and the first valve of the second circulating branch is closed, and the second throttling element is closed.
One or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:
the temperature control system comprises a refrigeration system and a circulating system, wherein the refrigeration system comprises a first refrigeration system and a second refrigeration system, the second refrigeration system comprises a first circulating branch and a second circulating branch, and a fifth heat exchanger of the first circulating branch is used as an evaporator and used for exchanging heat with circulating liquid and is a high-temperature refrigeration system; a third heat exchanger of a second circulation branch of the second refrigeration system is used as an evaporator of the second refrigeration system and a condenser of the first refrigeration system, the third heat exchanger is used for exchanging heat for a refrigerant of the first refrigeration system, and the first heat exchanger of the first refrigeration system is used as an evaporator for exchanging heat with a circulation liquid and is a low-temperature refrigeration system; the temperature control system is simple in structure and convenient to regulate and control, and is beneficial to accurately regulating the temperature of the circulating liquid.
Further, according to the temperature control method of the embodiment of the present invention, when the circulating liquid is increased from the first temperature to the second temperature, that is, the operation of the low-temperature-stage refrigeration system is switched to the operation of the high-temperature-stage refrigeration system, at this time, both the suction pressure and the discharge pressure of the second compressor in the second refrigeration system cannot meet the requirement of the working pressure thereof, and the stable operation of the second compressor is affected; at the moment, the second compressor is closed, the heater in the water tank is opened, the temperature of the circulating liquid is increased to the third temperature, the temperature of the circulating liquid is increased, and the refrigerant in the heat absorption side of the third heat exchanger is facilitated to be rapidly evaporated, so that the suction pressure of the second compressor of the second refrigeration system is improved, the second compressor is prevented from being damaged due to low suction pressure, the energy consumption of equipment is reduced, the stability of the system is improved, and the temperature regulation and control effect is good.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a temperature control system according to an embodiment of the present invention;
reference numerals:
COMP 1: a first compressor; COMP 2: a second compressor;
p1: a first pressure sensor; p2: a second pressure sensor; p3: a third pressure sensor;
t1: a first temperature sensor; t2: a second temperature sensor; t3: a third temperature sensor; t4: a fourth temperature sensor;
HE 1: a first heat exchanger; HE 2: a second heat exchanger; HE 3: a third heat exchanger; HE 4: a fourth heat exchanger; HE 5: a fifth heat exchanger;
EEV 1: a first orifice member; EEV 2: a second orifice member; EEV 3: a third throttling element;
SV 1: a first valve; SV 2: a second valve; v1: a third valve;
TANK 1: a water tank; HT 1: a heater; PUMP 1: a pump body; LG: a liquid level sensor; FS 1: an outlet flow sensor;
PCW: a plant side; a: an inlet end; b: an outlet end;
loading: a load device.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Embodiments of the first aspect of the present invention, as illustrated in fig. 1, provide a temperature control system, including: the refrigeration system comprises a first refrigeration system and a second refrigeration system, the first refrigeration system comprises a first compressor COMP1, a heat release side of a third heat exchanger HE3, a first throttling piece EEV1 and a heat absorption side of a first heat exchanger HE1 which are connected to form a cycle, the second refrigeration system comprises a second compressor COMP2, a heat release side of a fourth heat exchanger HE4, a throttling device and a heat absorption side of a fifth heat exchanger HE5 which are connected to form a first cycle branch, and the second refrigeration system further comprises a second compressor COMP2, a heat release side of a fourth heat exchanger HE4, a throttling device and a heat absorption side of a third heat exchanger HE3 which are connected to form a second cycle branch; the circulating system comprises a water TANK TANK1 and a heater HT1 arranged in the water TANK TANK1, wherein the water TANK TANK1, a Loading device and the heat release side of the first heat exchanger HE1 are connected with the heat release side of the fifth heat exchanger HE5 to form a circulation.
The refrigerant in the refrigeration system exchanges heat with circulating liquid in a circulating system through at least one of a first heat exchanger HE1 and a fifth heat exchanger HE5, a load device Loading connected with the circulating system exchanges heat with the circulating liquid, the temperature of the circulating liquid at the outlet end of the load device Loading is increased, so that the temperature of the inlet end of a water TANK TANK1 is increased, the refrigeration system adjusts the temperature of the circulating liquid after exchanging heat with the load device Loading (the circulating liquid releases heat in at least one of the first heat exchanger HE1 and the fifth heat exchanger HE 5) to reduce the temperature of the inlet end of the water TANK TANK1, namely, the temperature of the inlet end of the water TANK TANK1 is controlled to fluctuate within a certain temperature range, the refrigeration system controls the temperature of the outlet end of the water TANK TANK1 to fluctuate within a certain temperature range, and controls the temperature of the outlet end of the water TANK TANK1 to stabilize at a given target temperature by combining a heater 1 in the water TANK TANK1, the temperature control precision of the outlet end temperature of the water TANK TANK1 is ensured.
The first refrigeration system and the second refrigeration system have different refrigerating capacities, the first refrigeration system has a larger refrigerating capacity under general conditions and can be called as a low-temperature-level refrigeration system, and the second refrigeration system has a smaller refrigerating capacity than the first refrigeration system and can be called as a high-temperature-level refrigeration system.
According to the temperature control requirement of the circulating liquid, the temperature interval is divided into a high temperature section and a low temperature section. When the circulating liquid is in a high-temperature section, only the high-temperature-level refrigerating system is operated, namely a first circulating branch of a second refrigerating system is operated, the first refrigerating system stops operating, a second circulating branch of the second refrigerating system also stops operating, at the moment, a first compressor COMP1 is closed, a second compressor COMP2 is started, at the moment, a second compressor COMP2, the heat release side of a fourth heat exchanger HE4, a throttling device and the heat absorption side of a fifth heat exchanger HE5 are connected to form a circulating loop, circulating liquid at the Loading outlet end flows into the heat release side of the fifth heat exchanger HE5 and exchanges heat with refrigerant at the heat absorption side of the fifth heat exchanger HE5, before or after the circulating liquid exchanges heat in the fifth heat exchanger HE5, the circulating liquid flows through the heat release side (does not exchange heat) of the first heat exchanger HE1 and then flows back to the inlet end of a water TANK TANK1, and the circulating liquid adjusts the temperature of the circulating liquid through the first circulating branch, so that the inlet end temperature of the water TANK1 meets the requirements.
When the circulating liquid is in the low-temperature section, the high-temperature-level refrigeration system and the low-temperature-level refrigeration system need to operate, namely, the second circulating branches of the first refrigeration system and the second refrigeration system both operate, and at the moment, the operation mode of the first circulating branch of the second refrigeration system is not limited (generally stops operating). That is, the first compressor COMP1 and the second compressor COMP2 are both started, the heat release side of the first compressor COMP1 and the third heat exchanger HE3, the heat absorption side of the first throttling element EEV1 and the heat absorption side of the first heat exchanger HE1 are connected to form a circulation loop, the heat release side of the second compressor COMP2 and the fourth heat exchanger HE4, the throttling device and the heat absorption side of the third heat exchanger HE3 are connected to form a circulation loop, the heat absorption side of the third heat exchanger HE3 exchanges heat with the heat release side thereof, that is, the heat absorption side of the third heat exchanger HE3 cools the refrigerant in the first refrigeration system (the third heat exchanger HE3 serves as a condenser in the first refrigeration system), the temperature of the refrigerant in the first refrigeration system is sufficiently reduced, so that the heat absorption side of the first heat exchanger HE1 is sufficiently separated into circulation liquid to cool, the circulation liquid flows into the heat release side of the first heat exchanger HE1 and exchanges heat with the heat absorption side HE1 to return to the water TANK of the TANK1, the circulating liquid is matched with a second circulating branch of the first refrigerating system and the second refrigerating system to adjust the temperature of the circulating liquid, so that the temperature of the outlet end of the water TANK TANK1 meets the requirement. In the process, the circulating liquid at the outlet end of the Loading device flows through the heat release side of the fifth heat exchanger HE5, whether the circulating liquid exchanges heat in the fifth heat exchanger HE5 is not limited, and the circulating liquid does not exchange heat in the fifth heat exchanger HE5 generally.
The heater HT1 in the water TANK TANK1 can be used for heating circulating liquid, and the heater HT1 is matched with the first refrigeration system and the second refrigeration system, so that the temperature of the outlet end of the water TANK TANK1 can be accurately controlled.
And because the capacity of the refrigerant in the second refrigeration system is constant, when the circulating liquid is switched from a low-temperature stage to a high-temperature stage, the first refrigeration system needs to be closed, the second circulation branch of the second refrigeration system is closed, only the first circulation branch of the second refrigeration system is operated, and because the temperature of the circulating liquid is low during switching, the refrigerant in the second refrigeration system stays in the heat absorption side of the third heat exchanger HE3 of the second circulation branch due to low temperature, so that the refrigerant circulating in the first circulation branch is less and substantially in a liquid state, and the refrigerant in the first circulation branch is difficult to evaporate rapidly, at this time, during operation of the second compressor COMP2, the suction pressure and the discharge pressure are both lower than the working pressure allowed by the second compressor COMP2 and last for a certain time, so that the stability of the second refrigeration system is affected, which may damage the second compressor COMP 2.
At this time, the first circulation branch of the second refrigeration system may also be closed, the heater HT1 may be turned on until the temperature of the circulation liquid reaches the third temperature, and then the first circulation branch of the second refrigeration system may be turned on, where the temperature of the circulation liquid reaches the third temperature, and the heat release amount of the heat release side of the fifth heat exchanger HE5 may satisfy the refrigerant circulation requirement of the second compressor COMP2, and it may be understood that both the suction pressure and the discharge pressure of the second compressor COMP2 may reach the working pressure of the second compressor COMP 2.
The temperature control system of the embodiment can be understood as a temperature control system of a low-temperature cascade semiconductor, which not only can accurately regulate and control the temperature of the outlet end circulating liquid of the TANK TANK1, but also can ensure the stable operation of a refrigeration system; in the process of heating the circulating liquid from the low-temperature stage to the high-temperature stage, along with the temperature rise of the circulating liquid, the refrigerant of the second refrigeration system exchanging heat with the fifth heat exchanger HE5 is rapidly evaporated by the heater HT1 to improve the suction pressure of the second compressor COMP2 of the second refrigeration system, so that the second compressor COMP2 is prevented from being damaged due to low suction pressure, the energy consumption of equipment is reduced, the stability of the system is improved, and the control effect is good.
It will be appreciated with reference to fig. 1 that the first refrigeration system also includes a second heat exchanger HE2, with the heat rejection side of the third heat exchanger HE3 connected between the heat rejection side of the second heat exchanger HE2 and the heat absorption side of the first heat exchanger HE 1. The second heat exchanger HE2 is equivalent to a precooler and used for carrying out pre-heat exchange on the refrigerant discharged by the first compressor COMP1, and the second heat exchanger HE2 is matched with the third heat exchanger HE3 to carry out two-stage temperature reduction on the refrigerant.
The heat absorption side of the second heat exchanger HE2 is communicated with the plant side PCW, and the second heat exchanger HE2 exchanges heat with the cold fluid of the plant side PCW to reduce the temperature, so that the structure is simple, and the heat of the refrigeration system is fully utilized. The inlet end a of the plant PCW and the outlet end B of the plant PCW communicate with each other through the heat absorption side of the second heat exchanger HE 2.
It can be understood that, referring to fig. 1, a first valve SV1 is provided between the heat releasing side of the fourth heat exchanger HE4 and the heat absorbing side of the third heat exchanger HE3, and a second valve SV2 is provided between the heat releasing side of the fourth heat exchanger HE4 and the heat absorbing side of the fifth heat exchanger HE 5. The on-off of the first circulation branch and the second circulation branch is adjusted through the opening and closing of the first valve SV1 and the second valve SV2, the structure is simple, and the adjustment is simple and convenient. Wherein, the first valve SV1 and the second valve SV2 can both adopt electromagnetic valves.
It is to be understood that, referring to fig. 1, the throttle apparatus includes a second throttle EEV2 and a third throttle EEV3, the second throttle EEV2 being provided between the first valve SV1 and the heat absorption side of the third heat exchanger HE3, and the third throttle EEV3 being provided between the second valve SV2 and the heat absorption side of the fifth heat exchanger HE 5. Namely, the first circulation branch is provided with the third throttling element EEV3, and the second circulation branch is provided with the second throttling element EEV2, so that each circulation branch can independently perform expansion and pressure reduction, and the heat exchange efficiency of the refrigerant of each circulation branch is ensured.
It will be appreciated that, as shown with reference to fig. 1, the heat absorption side of the fourth heat exchanger HE4 communicates with the plant side PCW. The fourth heat exchanger HE4 exchanges heat with the cold fluid of the plant side PCW to reduce the temperature, has a simple structure, and makes full use of the heat of the refrigeration system. The inlet end a of the plant PCW and the outlet end B of the plant PCW communicate with each other through the heat absorption side of the fourth heat exchanger HE 4.
As can be appreciated, a first pressure sensor P1 is connected to the inlet end of the second compressor COMP 2; the outlet end of the second compressor COMP2 is connected with a second pressure sensor P2. The first pressure sensor P1 is used to measure the suction pressure of the second compressor COMP2, and the second pressure sensor P2 is used to measure the discharge pressure of the second compressor COMP2, so as to monitor whether the suction pressure and the discharge pressure of the second compressor COMP2 meet the working pressure. When at least one of the suction pressure and the discharge pressure of the second compressor COMP2 does not meet the requirement of working pressure, the circulating liquid can be heated and regulated by a heater HT 1.
It will be appreciated that, with reference to FIG. 1, a first temperature sensor T1 is connected to the outlet end of TANK TANK1 and a third temperature sensor T3 is connected to the inlet end of TANK TANK 1. The first temperature sensor T1 is used to measure the temperature of the circulating liquid to facilitate the adjustment of the operation state of the refrigeration system and the operation state of the heater HT 1. The third temperature sensor T3 measures the temperature at the inlet end of the TANK1, and also monitors the heat exchange between the circulating liquid and the refrigeration system, so as to adjust the operating state of the heater HT1 according to the temperature at the inlet end of the TANK1 measured by the third temperature sensor T3.
As can be understood, the inlet end of the heat release side of the fifth heat exchanger HE5 is connected with a second temperature sensor T2; it can also be understood that the outlet end of the load device Loading is connected with a second temperature sensor T2, which facilitates determining the operating state of the second compressor COMP2 according to the temperature of the circulating liquid entering the heat-discharging side of the fifth heat exchanger HE5, and also facilitates determining the operating state of the first compressor COMP1 according to the temperature of the circulating liquid entering the heat-discharging side of the first heat exchanger HE 1.
It can be understood that the inlet end of the heat absorption side of the first heat exchanger HE1 is connected with the fourth temperature sensor T4, and it can also be understood that the temperature of the refrigerant at the heat release side of the third heat exchanger HE3 is monitored, and the heat exchange effect between the refrigerant of the first refrigeration system and the circulation liquid can be conveniently monitored according to the temperature of the refrigerant after the heat release of the first refrigeration system, which is measured by the fourth temperature sensor T4.
It will be appreciated that a level sensor LG is connected to the TANK1 to facilitate monitoring of the level of the TANK 1. The water TANK TANK1 is connected with a first water outlet pipeline and a second water outlet pipeline, the first water outlet pipeline is connected with a PUMP body PUMP1 to ensure water outlet power, the second water outlet pipeline is connected with a third valve V1, the third valve V1 is opened and closed to adjust the second water outlet pipeline in an on-off mode, the first water outlet pipeline and the second water outlet pipeline are converged on a main pipeline, and the main pipeline is connected with a first temperature sensor T1 and an outlet flow sensor FS1 to monitor the water outlet temperature and the water outlet quantity of the water TANK TANK 1; the main pipeline is also connected with a third pressure sensor P3 for monitoring the water outlet pressure. And a Loading device is connected between the main pipeline and the refrigerating system.
Wherein, the heater HT1 in the water TANK TANK1 can be a heating pipe, a heating rod or a heating belt.
In an embodiment of the second aspect of the present invention, there is provided a temperature control method applied to the temperature control system of one or more embodiments above, including:
the temperature of circulating liquid in the circulating system is a first temperature, and second circulating branches of the first refrigerating system and the second refrigerating system are both opened;
when the temperature of the circulating liquid is increased to a second temperature from a first temperature, the first refrigeration system and the second refrigeration system are both closed, the heater HT1 is turned on until the temperature of the circulating liquid reaches a third temperature, and the second refrigeration system is turned on, wherein the temperature of the circulating liquid reaches the third temperature, and the suction pressure and the discharge pressure of the second compressor COMP2 both reach the working pressure of the second compressor COMP 2.
Since the capacity of the refrigerant in the second refrigeration system is constant, when the circulating liquid is warmed from the first temperature to the second temperature, the first refrigeration system is required to be closed, the second circulation branch of the second refrigeration system is closed, only the first circulation branch of the second refrigeration system is operated, since the temperature of the circulating liquid (first temperature) is low at the time of switching, the refrigerant in the second refrigeration system stays in the heat absorption side of the third heat exchanger HE3 of the second circulation branch due to the low temperature, therefore, the refrigerant circulating in the first circulation branch is less and substantially in a liquid state, and the refrigerant in the first circulation branch is difficult to evaporate rapidly, and at this time, the second compressor COMP2 is in operation, the suction pressure and the discharge pressure are both lower than the working pressure allowed by the second compressor COMP2 and last for a certain time, affecting the stability of the second refrigeration system, which will cause damages to the second compressor COMP 2.
At this time, the first circulation branch of the second refrigeration system may also be closed, the heater HT1 may be turned on until the temperature of the circulation liquid reaches a third temperature, and then the second refrigeration system may be turned on, where the temperature of the circulation liquid reaches the third temperature, and the heat release amount of the heat release side of the fifth heat exchanger HE5 may meet the refrigerant circulation requirement of the second compressor COMP2, and it may be understood that both the suction pressure and the discharge pressure of the second compressor COMP2 may reach the working pressure of the second compressor COMP 2.
The third temperature is generally between the first temperature and the second temperature, but is not limited to the range of the third temperature, and can be set as required. The third temperature can be obtained through experiments, that is, the first compressor COMP1 and the second compressor COMP2 are stopped, the heater HT1 is operated until the suction pressure and the discharge pressure of the second compressor COMP2 both meet the requirement of the working pressure, and the temperature of the outlet-end circulating liquid of the TANK1 is recorded as the third temperature.
The temperature control method of the embodiment can not only accurately regulate and control the temperature of the outlet end circulating liquid of the TANK TANK1, but also ensure the stable operation of the refrigeration system; in the process of heating the circulating liquid, by means of heating the circulating liquid by the heater HT1, along with the temperature rise of the circulating liquid, refrigerant of the second refrigeration system exchanging heat with the fifth heat exchanger HE5 is rapidly evaporated, so that the suction pressure of the second compressor COMP2 of the second refrigeration system is improved, the second compressor COMP2 is prevented from being damaged due to low suction pressure, the energy consumption of equipment is reduced, the stability of the system is improved, and the control effect is good.
Wherein, the first refrigeration system and the second refrigeration system are both closed, it can be understood that the first compressor COMP1 is closed, the second compressor COMP2 is closed, the first throttle EEV1, the second throttle EEV2 and the third throttle EEV3 are all closed.
It will be appreciated that the first temperature, the second temperature and the third temperature are the temperatures of the circulating liquid at the outlet end of TANK 1. First temperature, second temperature are the target temperature of circulating fluid, regard the temperature of water TANK TANK 1's exit end as target temperature, help the temperature of accurate regulation and control circulating fluid, satisfy load device Loading's heat transfer demand.
Referring to fig. 1, the first temperature, the second temperature and the third temperature are measured by a first temperature sensor T1 at the outlet end of the TANK 1.
It can be understood that the temperature of the circulating liquid reaches the third temperature, the second valve SV2 of the first circulating branch is opened, the third throttle EEV3 is opened, the first circulating branch is operated, and the refrigerant of the fifth heat exchanger HE5 exchanges heat with the circulating liquid of the circulating system; the first valve SV1 of the second circulation branch is closed, the second throttle EEV2 is closed, the first refrigeration system is also closed, the circulation liquid flows only through the first heat exchanger HE1, and the circulation liquid does not exchange heat with the refrigerant of the first refrigeration system.
The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.
Claims (10)
1. A temperature control system, comprising:
the refrigerating system comprises a first refrigerating system and a second refrigerating system, wherein the first refrigerating system comprises a first compressor, a heat release side of a third heat exchanger, a first throttling part and a heat absorption side of the first heat exchanger which are connected to form a cycle, the second refrigerating system comprises a second compressor, a heat release side of a fourth heat exchanger, a throttling device and a heat absorption side of a fifth heat exchanger which are connected to form a first cycle branch, and the second refrigerating system also comprises a second compressor, a heat release side of a fourth heat exchanger, a throttling device and a heat absorption side of a third heat exchanger which form a second cycle branch;
and the circulating system comprises a water tank and a heater arranged in the water tank, and the water tank, the load device and the heat release side of the first heat exchanger are connected with the heat release side of the fifth heat exchanger to form circulation.
2. The temperature control system of claim 1, wherein the first refrigeration system further comprises a second heat exchanger, and wherein a heat rejection side of the third heat exchanger is connected between a heat rejection side of the second heat exchanger and a heat absorption side of the first heat exchanger.
3. The temperature control system according to claim 1, wherein a first valve is arranged between the heat-releasing side of the fourth heat exchanger and the heat-absorbing side of the third heat exchanger, and a second valve is arranged between the heat-releasing side of the fourth heat exchanger and the heat-absorbing side of the fifth heat exchanger.
4. The temperature control system of claim 3, wherein the throttling arrangement comprises a second throttling element disposed between the first valve and the heat absorption side of the third heat exchanger and a third throttling element disposed between the second valve and the heat absorption side of the fifth heat exchanger.
5. The temperature control system of claim 2, wherein the heat absorption side of the second heat exchanger is in communication with a plant side; and/or the heat absorption side of the fourth heat exchanger is communicated with the plant side.
6. The temperature control system of claim 1, wherein a first pressure sensor is connected to an inlet end of the second compressor; and the outlet end of the second compressor is connected with a second pressure sensor.
7. The temperature control system according to any one of claims 1 to 6, wherein a first temperature sensor is connected to an outlet end of the water tank;
the inlet end of the water tank is connected with a third temperature sensor;
the inlet end of the heat-releasing side of the fifth heat exchanger is connected with a second temperature sensor;
and/or the inlet end of the heat absorption side of the first heat exchanger is connected with a fourth temperature sensor.
8. A temperature control method applied to the temperature control system according to any one of claims 1 to 7, comprising:
the temperature of circulating liquid in the circulating system is a first temperature, and second circulating branches of the first refrigerating system and the second refrigerating system are both opened;
the method comprises the steps that the circulating liquid is increased from a first temperature to a second temperature, the first refrigeration system and the second refrigeration system are both closed, the heater is started until the temperature of the circulating liquid reaches a third temperature, and a first circulating branch of the second refrigeration system is started, wherein the temperature of the circulating liquid reaches the third temperature, and the suction pressure and the exhaust pressure of the second compressor both reach the working pressure of the second compressor.
9. The temperature control method according to claim 8, wherein the first temperature, the second temperature, and the third temperature are temperatures of circulating liquid at an outlet end of the water tank.
10. The temperature control method according to claim 8, wherein the temperature of the circulating fluid reaches a third temperature, the second valve of the first circulating branch is opened, the third throttling element is opened, and the first valve of the second circulating branch is closed, and the second throttling element is closed.
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| CN114610091A (en) * | 2022-01-26 | 2022-06-10 | 北京京仪自动化装备技术股份有限公司 | Temperature control equipment and temperature control method |
| CN114815927A (en) * | 2022-05-24 | 2022-07-29 | 国网江苏省电力有限公司泰州供电分公司 | Large power supply temperature control system of power distribution station |
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| CN114815927B (en) * | 2022-05-24 | 2024-01-09 | 国网江苏省电力有限公司泰州供电分公司 | Large-scale power supply temperature control system of power distribution station |
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