CN110657596A - Natural cooling multi-connected refrigeration system with built-in gravity heat pipe and control method - Google Patents
Natural cooling multi-connected refrigeration system with built-in gravity heat pipe and control method Download PDFInfo
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- CN110657596A CN110657596A CN201911060452.8A CN201911060452A CN110657596A CN 110657596 A CN110657596 A CN 110657596A CN 201911060452 A CN201911060452 A CN 201911060452A CN 110657596 A CN110657596 A CN 110657596A
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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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/0266—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers
Abstract
The invention discloses a natural cooling multi-connected refrigeration system with a built-in gravity heat pipe and a control method, wherein the system comprises: a plurality of centralized heat pipe cold source module and with a plurality of power loop module of centralized heat pipe cold source module thermal coupling connection, wherein, centralized heat pipe cold source module includes: the condenser, the first liquid storage tank and the heat exchanger are sequentially connected into a loop, and the first liquid storage tank is higher than the heat exchanger; the power loop module comprising: the second liquid storage tank, the heat pipe power pump and the heat pipe evaporator are sequentially connected into a loop; the inlets of the plurality of power loop modules are connected with the liquid pipe branches; outlets of the plurality of power loop modules are connected with the air pipe branch; the liquid pipe branch is communicated with the air pipe branch; and the pipeline between the liquid pipe branch and the air pipe branch is thermally coupled with the heat exchangers of the plurality of concentrated heat pipe cold source modules. By applying the embodiment of the invention, the energy consumption of the cooling system can be reduced.
Description
Technical Field
The invention relates to a refrigeration system and a control method, in particular to a natural cooling multi-connected refrigeration system with a built-in gravity heat pipe and a control method.
Background
With the rapid development of the data center industry, the proportion of the electric energy consumed by the data center in the total electric energy consumption is higher and higher. For a data center, how to reduce the energy consumption of the data center to reduce the cost is an urgent technical problem to be solved; likewise, it is a good choice for the country to realize a green data center with low energy consumption.
Currently, it is common to choose to reduce the energy consumption for cooling a data center in order to reduce the energy consumption of the data center. The existing low-energy consumption cooling mode comprises the following steps: an air-air indirect evaporative cooling scheme, a fresh air cooling scheme, an indirect evaporative cooling scheme taking water as a medium and the like. However, the current energy-saving cooling scheme mainly has the following defects: the air-air heat exchange cooling scheme has low heat exchange efficiency, and the size of the cooling equipment under the same cooling capacity is larger; the fresh air cleaning treatment and later maintenance cost in the fresh air cooling scheme is higher; the indirect evaporative cooling or direct evaporative cooling scheme using water as a medium has higher water treatment and air treatment cost.
Therefore, the technical problem of high cooling cost of the data center exists in the prior art.
Disclosure of Invention
The invention aims to solve the technical problem of providing a natural cooling multi-connected refrigeration system with a built-in gravity heat pipe and a control method thereof, so as to solve the problem in the prior art.
The invention solves the technical problems through the following technical scheme:
the embodiment of the invention provides a natural cooling multi-connected refrigeration system with a built-in gravity heat pipe, which comprises: a plurality of heat pipe cold source modules and a plurality of power loop modules thermally coupled with the heat pipe cold source modules, wherein,
the heat pipe cold source module comprises: the condenser, the first liquid storage tank and the heat exchanger are sequentially connected into a loop, and the first liquid storage tank is higher than the heat exchanger;
the power loop module comprising: the second liquid storage tank, the heat pipe power pump and the heat pipe evaporator are sequentially connected into a loop;
the inlets of the plurality of power loop modules are connected with the liquid pipe branches;
outlets of the plurality of power loop modules are connected with the air pipe branch;
the liquid pipe branch is communicated with the air pipe branch; and the pipeline between the liquid pipe branch and the air pipe branch is thermally coupled with the heat exchangers of the plurality of concentrated heat pipe cold source modules.
Optionally, a first filter and a first throttle valve are further connected in series between the first liquid storage tank and the heat exchanger.
Optionally, a first electromagnetic valve is further connected between the first liquid storage tank and the heat exchanger.
Optionally, a compressor and a second filter are further connected in series between the first liquid storage tank and the heat exchanger.
Optionally, a second electromagnetic valve is further connected between the first liquid storage tank and the heat exchanger.
Optionally, the heat pipe power pump is further connected in parallel with a check valve.
Optionally, a sprayer is further arranged above the condenser.
The embodiment of the invention provides a control method of a natural cooling multi-connected refrigeration system with a built-in gravity heat pipe, wherein the system comprises the following steps: a plurality of heat pipe cold source modules and a plurality of power loop modules thermally coupled with the heat pipe cold source modules, wherein,
the heat pipe cold source module comprises: the condenser, the first liquid storage tank and the heat exchanger are sequentially connected into a loop, and the first liquid storage tank is higher than the heat exchanger;
the power loop module comprising: the second liquid storage tank, the heat pipe power pump and the heat pipe evaporator are sequentially connected into a loop;
the inlets of the plurality of power loop modules are connected with the liquid pipe branches;
outlets of the plurality of power loop modules are connected with the air pipe branch;
the liquid pipe branch is communicated with the air pipe branch; and the pipeline between the liquid pipe branch and the gas pipe branch is thermally coupled with the heat exchangers of the plurality of concentrated heat pipe cold source modules;
a compressor and a second filter are also connected in series between the first liquid storage tank and the heat exchanger; a sprayer is also arranged above the condenser;
the method comprises the following steps:
1) judging whether the difference between the temperature of the environment where the heat pipe evaporator is located and the first preset threshold value is greater than or equal to the temperature of the environment where the condenser is located or not under the condition that the refrigeration system needs to be used for refrigeration; if yes, executing step 2); if not, executing the step 3);
2) keeping the compressor in a closed state;
3) judging whether the temperature of the environment where the condenser is located is greater than the difference between the temperature of the environment where the heat pipe evaporator is located and a first preset threshold value, and whether the temperature of the environment where the condenser is located is less than or equal to the difference between the temperature of the environment where the heat pipe evaporator is located and a second preset threshold value are both true, wherein the first preset threshold value is greater than the second preset threshold value; if yes, executing step 4); if not, executing the step 5);
4) when the preset condition of spraying is met, starting the sprayer until the temperature of the environment where the condenser is located is greater than the difference between the temperature of the environment where the heat pipe evaporator is located and a first preset threshold value;
5) judging whether the temperature of the environment where the condenser is located is greater than the difference between the temperature of the environment where the heat pipe evaporator is located and a second preset threshold value, and whether the temperature of the environment where the condenser is located is less than or equal to the difference between the temperature of the environment where the heat pipe evaporator is located and a third preset threshold value is true, wherein the second preset threshold value is greater than the third preset threshold value; if yes, executing step 6); if not, executing step 7);
6) starting the compressor and additionally starting at least one power loop module; and starting the sprayer under the condition of meeting the spraying condition;
7) and starting the compressor.
Compared with the prior art, the invention has the following advantages:
(1) by applying the embodiment of the invention, the first liquid storage tank in the centralized heat pipe cold source module is arranged at a position higher than the heat exchanger, so that the power circulation is formed by fully utilizing the fall of the system, and the energy consumption is reduced compared with the forced power circulation in the prior art.
(2) The cold source is integrated with the cold source module of the centralized heat pipe, so that the modularization degree of the equipment is improved, the installation cost can be reduced, and the capacity expansion is easy.
(3) Because a plurality of power loop modules of the heat dissipation end are constructed by being divided into a plurality of modules, the power loop modules can be arranged at different positions to be dispersedly arranged, and the space adaptability of the equipment is improved.
Drawings
Fig. 1 is a schematic structural diagram of a natural cooling multiple refrigeration system with a built-in gravity heat pipe according to an embodiment of the present invention;
fig. 2 is another schematic structural diagram of a natural cooling multiple refrigeration system with a built-in gravity heat pipe according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a control method of a natural cooling multiple refrigeration system with a built-in gravity heat pipe according to an embodiment of the present invention.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
Fig. 1 is a schematic structural diagram of a natural cooling multiple refrigeration system with built-in gravity heat pipes according to an embodiment of the present invention, and fig. 2 is another schematic structural diagram of a natural cooling multiple refrigeration system with built-in gravity heat pipes according to an embodiment of the present invention, as shown in fig. 1 and fig. 2, the system includes: a plurality of concentrated heat pipe cold source modules 10 and a plurality of power loop modules 20 thermally coupled to the concentrated heat pipe cold source modules 10, wherein,
the centralized heat pipe cold source module 10 includes: the condenser 101, the first liquid storage tank 103 and the heat exchanger 105 are sequentially connected into a loop, and the first liquid storage tank 103 is arranged at a position higher than the heat exchanger 105;
the power loop module 20 includes: a second liquid storage tank 201, a heat pipe power pump 203 and a heat pipe evaporator 205 which are connected into a loop in sequence;
the inlets of the plurality of power loop modules 20 are connected with the liquid pipe branch 207;
the outlets of the plurality of power loop modules 20 are connected with the air pipe branch 209;
the liquid pipe branch 207 is communicated with the air pipe branch 209; and the pipeline between the liquid pipe branch 207 and the gas pipe branch 209 is thermally coupled to the heat exchangers 105 of the plurality of concentrated heat pipe cold source modules 10.
As shown in fig. 1, the apparatus of embodiment 1 of the present invention may be provided with two concentrated heat pipe cold source modules 10, and 4 power loop modules 20. In practical applications, the number of the concentrated heat pipe cold source modules 10 and the number of the power loop modules 20 may be adjusted according to practical requirements, and the embodiment of the present invention is not limited thereto.
The liquid heat dissipation medium R410A is stored in the second liquid storage tank 201, flows into the tail end of the power loop module 20, absorbs heat at the tail end in the data center machine room, and the heat dissipation medium R410A becomes gaseous heat absorption and then flows into the air path manifold to enter the plate heat exchanger 105 to exchange heat with the concentrated heat pipe cold source module 10. The heat dissipation medium in the power loop module 20 flowing out of the plate heat exchanger 105 transfers heat to the heat dissipation medium in the loop of the concentrated heat pipe cold source module 10, and then the heat dissipation medium in the power loop module 20 becomes liquid and flows back to the second liquid storage tank 201 in the power loop module 20. According to the embodiment of the invention, the power cycle is formed by the fall of the system and the gas-liquid density difference, so that the energy efficiency ratio of the whole system can be improved.
The liquid heat dissipation medium R410A is stored in the first reservoir 103, the heat dissipation medium R410A flows into the plate heat exchanger 105 through the solenoid valve under the action of gravity to change into a gas state, flows out of the plate heat exchanger 105 to return to the condenser 101, dissipates heat in the condenser 101 to recover into a liquid state, and then the purpose of dissipating heat is achieved.
Further, in order to avoid impurities entering the plate heat exchanger 105, a first filter 107 is connected in series between the first liquid storage tank 103 and the heat exchanger 105; in order to regulate the flow of the heat-dissipating medium flowing into the plate heat exchanger 105 from the first reservoir 103, a first throttle valve 109 is also provided between the first reservoir 103 and the heat exchanger 105.
Further, a first solenoid valve 1011 is connected between the first reservoir 103 and the heat exchanger 105 so that the flow rate between the first reservoir 103 and the heat exchanger 105 is insufficient when the opening degree of the first throttle valve 109 is maximized.
As shown in fig. 1, the pipeline of the first solenoid valve 1011 is connected in parallel with the pipeline where the first filter 107 and the first throttle valve 109 are located; and two ends of the pipeline of the first electromagnetic valve 1011 are respectively communicated with the first liquid storage tank 103 and the heat exchanger 105.
Further, in order to improve the heat exchange efficiency of the concentrated heat pipe cold source module 10, a compressor 1013 and a second filter 1015 are also connected in series between the condenser 101 and the heat exchanger 105.
Specifically, when the compressor 1013 is started, the compressor 1013 may force the gaseous heat exchange medium flowing out of the plate heat exchanger 105 to flow to the condenser 101, and then force the gaseous heat exchange medium to be compressed into a liquid state in the condenser 101, so as to dissipate heat through the condenser 101.
Further, in order to increase the flow rate of the heat radiation medium flowing back between the condenser 101 and the heat exchanger 105, a second electromagnetic valve 1017 is connected between the condenser 101 and the heat exchanger 105.
Specifically, when the second electromagnetic valve 1017 is opened, the heat dissipation medium flowing out of the plate heat exchanger 105 may flow into the condenser 101 through the second electromagnetic valve 1017 and the pipeline in which the compressor 1013 is located.
Further, in order to promote the heat dissipation of the condenser 101 and further improve the heat exchange efficiency of the concentrated heat pipe cold source module 10, a sprayer 1019 is further disposed above the condenser 101.
Further, a bypass solenoid valve 2011 is connected between the inlet conduit and the outlet conduit of the power loop module 20.
In order to ensure the fluidity of the heat dissipation medium in the power loop module 20 without the heat exchange requirement, the bypass solenoid valve 2011 may be opened, so that the heat dissipation medium circulates inside the power loop module 20.
Further, in order to avoid the backflow of the heat dissipation medium in the power loop module 20 when the heat pipe power pump 203 is turned off, the heat pipe power pump 203 of the power loop module 20 is also connected in parallel with a check valve 2013.
In practice, several parallel heat pipe evaporators 205 may be included in a power loop module 20. The inlets of the plurality of power loop modules 20 are connected with the liquid pipe branch 207; when the outlets of the plurality of power loop modules 20 are connected to the air pipe branch 209, the power loop modules 20 are connected in parallel.
Further, in order to control the on/off of the heat medium in the heat pipe evaporator 205, a solenoid valve may be provided on the liquid inlet pipe of each heat pipe evaporator 205.
Further, a control heat exchanger 105 is arranged in each loop of the concentrated heat pipe cold source module 10, is thermally coupled to the heat exchanger 105, and an outlet of a pipe connected to the power loop module 20 is connected to a liquid manifold of the power loop module 20 through a solenoid valve, and an inlet of a pipe connected to the power loop module 20 is thermally coupled to the heat exchanger 105 and is connected to a gas manifold of the power loop module 20 through a solenoid valve.
In a specific implementation manner of the embodiment of the present invention, a cold water pipeline 1019 is further coupled in the heat exchanger 105, so that the power loop module 20 is cooled by using cold water when the centralized heat pipe cold source module 10 does not work.
By applying the embodiment of the invention, the heat exchanger 105 can be arranged outdoors, cooling water is not introduced into a machine room, and the reliability of the data center machine room is improved.
In the embodiment of the invention, the used heat exchanger 105 is a phase change heat exchanger, so that the heat exchange efficiency is high and the equipment size is small. The cold source host adopts a modular packaging design, and the engineering installation is simple; the cold source module is matched with the cold source module, so that the construction cost is low, and the expansion is simple and easy.
Example 2
Fig. 3 is a schematic flow chart of a control method of a natural cooling multiple refrigeration system with built-in gravity heat pipes according to an embodiment of the present invention, and as shown in fig. 3, the control method of the natural cooling multiple refrigeration system with built-in gravity heat pipes is applied to a natural cooling multiple refrigeration system with built-in gravity heat pipes, and the system includes: a plurality of centralized heat pipe cold source module 10 and a plurality of power loop module 20 with centralized heat pipe cold source module 10 thermal coupling connection, wherein, centralized heat pipe cold source module 10 includes: the condenser 101, the first liquid storage tank 103 and the heat exchanger 105 are sequentially connected into a loop, and the liquid storage tank is arranged at a position higher than the heat exchanger 105; the power loop module 20 includes: a second liquid storage tank 201, a heat pipe power pump 203 and a heat pipe evaporator 205 which are connected into a loop in sequence; the inlets of the plurality of power loop modules 20 are connected with the liquid pipe branch 207; the outlets of the plurality of power loop modules 20 are connected with the air pipe branch 209; the liquid pipe branch 207 is communicated with the air pipe branch 209; and the pipeline between the liquid pipe branch 207 and the gas pipe branch 209 is thermally coupled with the heat exchangers 105 of the plurality of concentrated heat pipe cold source modules 10; a compressor 1013 and a second filter 1015 are also connected in series between the first liquid storage tank 103 and the heat exchanger 105; a sprayer 1019 is also arranged above the condenser 101; the method comprises the following steps:
1) when the refrigeration system is required to be used for refrigeration, namely the temperature of the environment where the heat pipe evaporator 205 is located is higher than a set value, whether the difference between the temperature of the environment where the heat pipe evaporator 205 is located and a first preset threshold value is larger than or equal to the temperature of the environment where the condenser 101 is located is judged; if yes, executing step 2); if not, executing the step 3);
2) and keeps the compressor 1013 in a closed state.
3) Judging whether the temperature of the environment where the condenser 101 is located is greater than the difference between the temperature of the environment where the heat pipe evaporator 205 is located and a first preset threshold value, and whether the temperature of the environment where the condenser 101 is located is less than or equal to the difference between the temperature of the environment where the heat pipe evaporator 205 is located and a second preset threshold value, wherein the first preset threshold value is greater than the second preset threshold value; if yes, executing step 4); if not, executing step 5).
4) And when the preset condition of spraying is met, starting the sprayer 1019 until the temperature of the environment where the condenser 101 is located is greater than the difference between the temperature of the environment where the heat pipe evaporator 205 is located and the first preset threshold value.
5) Judging whether the temperature of the environment where the condenser 101 is located is greater than the difference between the temperature of the environment where the heat pipe evaporator 205 is located and a second preset threshold value, and whether the temperature of the environment where the condenser 101 is located is less than or equal to the difference between the temperature of the environment where the heat pipe evaporator 205 is located and a third preset threshold value is true, wherein the second preset threshold value is greater than the third preset threshold value; if yes, executing step 6); if not, go to step 7).
6) Starting the compressor 1013 and additionally starting at least one power loop module 20; and starts the sprayer 1019 when the spraying condition is satisfied.
7) And starting the compressor 1013.
Specifically, the method comprises the following steps: the temperature of the environment in which the heat pipe evaporator 205 is located is 30 degrees celsius, the first preset threshold is 5 degrees celsius, the second preset threshold is 4 degrees celsius, and the third preset threshold is 3 degrees celsius.
A: when the temperature of the environment where the condenser 101 is located is 24 degrees celsius, the difference between the temperature of the environment where the heat pipe evaporator 205 is located and the first preset threshold is greater than the temperature of the environment where the condenser 101 is located, and step 2) is executed.
The compressor 1013 is kept in a closed state, that is, the liquid heat dissipation medium R410A is stored in the first reservoir 103, the heat dissipation medium R410A flows into the plate heat exchanger 105 through the electromagnetic valve under the action of gravity to become a gas state, flows out from the plate heat exchanger 105 to return to the condenser 101, dissipates heat in the condenser 101 to return to a liquid state, and thus, the purpose of dissipating heat is achieved.
B: when the temperature of the environment where the condenser 101 is located is 26 ℃, the difference between the temperature of the environment where the heat pipe evaporator 205 is located and the first preset threshold value is smaller than the temperature of the environment where the condenser 101 is located; the difference between the temperature of the environment in which the heat pipe evaporator 205 is located and the second preset threshold value is equal to the temperature of the environment in which the condenser 101 is located.
In this step, if the temperature of the condenser 101 is higher than the set value, the sprayer 1019 is activated until the temperature of the environment in which the hot tube evaporator 205 is located is reduced to 25 degrees celsius.
If the temperature of the condenser 101 is not higher than the set value, an additional concentrated heat pipe cold source module 10 is activated to dissipate heat.
C: when the ambient temperature of the condenser 101 is 27 ℃, the difference between the ambient temperature of the heat pipe evaporator 205 and the second preset threshold is less than the ambient temperature of the condenser 101; and the difference between the temperature of the environment in which the heat pipe evaporator 205 is located and the third preset threshold value is equal to the temperature of the environment in which the condenser 101 is located.
In this step, an additional centralized heat pipe cold source module 10 is started to dissipate heat.
D: if the temperature of the environment where the condenser 101 is located is 27 ℃, the difference between the temperature of the environment where the heat pipe evaporator 205 is located and the second preset threshold value is smaller than the temperature of the environment where the condenser 101 is located; and the condition that the difference between the temperature of the environment where the heat pipe evaporator 205 is located and the third preset threshold is equal to the temperature of the environment where the condenser 101 is located is not satisfied, that is, the temperature of the environment where the condenser 101 is located is too high, the compressor 1013 in the centralized heat pipe cold source module 10 is started to perform forced heat dissipation.
By applying the embodiment of the invention, when the temperature of the environment where the condenser 101 is located is lower, the gravity circulation can be used for cooling without starting the compressor 1013, so that the energy consumption is reduced compared with the case of cooling by using the compressor 1013.
In addition, the embodiment of the invention can use different refrigeration strategies according to different temperatures of the environment where the condenser 101 is located, thereby reducing energy consumption.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A built-in gravity heat pipe natural cooling multi-connected refrigeration system is characterized by comprising: a plurality of heat pipe cold source modules and a plurality of power loop modules thermally coupled with the heat pipe cold source modules, wherein,
the heat pipe cold source module comprises: the condenser, the first liquid storage tank and the heat exchanger are sequentially connected into a loop, and the first liquid storage tank is higher than the heat exchanger;
the power loop module comprising: the second liquid storage tank, the heat pipe power pump and the heat pipe evaporator are sequentially connected into a loop;
the inlets of the plurality of power loop modules are connected with the liquid pipe branches;
outlets of the plurality of power loop modules are connected with the air pipe branch;
the liquid pipe branch is communicated with the air pipe branch; and the pipeline between the liquid pipe branch and the air pipe branch is thermally coupled with the heat exchangers of the plurality of concentrated heat pipe cold source modules.
2. The natural cooling multi-connected refrigeration system with the built-in gravity heat pipe as recited in claim 1, wherein a first filter and a first throttle valve are further connected in series between the first liquid storage tank and the heat exchanger.
3. The natural cooling multi-connected refrigeration system with the built-in gravity heat pipe as recited in claim 2, wherein a first solenoid valve is further connected between the first liquid storage tank and the heat exchanger.
4. The natural cooling multi-connected refrigerating system with the built-in gravity heat pipe as recited in claim 1, wherein a compressor and a second filter are further connected in series between the condenser and the heat exchanger.
5. The natural cooling multi-connected refrigerating system with the built-in gravity heat pipe as recited in claim 4, wherein a second electromagnetic valve is further connected between the condenser and the heat exchanger.
6. The natural cooling multi-connected refrigerating system with the built-in gravity heat pipe as recited in claim 1, wherein the heat pipe power pump is further connected with a check valve in parallel.
7. The natural cooling multi-connected refrigerating system with the built-in gravity heat pipe as recited in claim 1, wherein a sprayer is further arranged above the condenser.
8. The natural cooling multi-connected refrigeration system with the built-in gravity heat pipe as recited in claim 1, wherein a bypass solenoid valve is further connected between the inlet pipeline and the outlet pipeline of the power loop module.
9. A control method of a natural cooling multi-connected refrigeration system with a built-in gravity heat pipe is characterized in that the system comprises the following steps: a plurality of heat pipe cold source modules and a plurality of power loop modules thermally coupled with the heat pipe cold source modules, wherein,
the heat pipe cold source module comprises: the condenser, the first liquid storage tank and the heat exchanger are sequentially connected into a loop, and the first liquid storage tank is higher than the heat exchanger;
the power loop module comprising: the second liquid storage tank, the heat pipe power pump and the heat pipe evaporator are sequentially connected into a loop;
the inlets of the plurality of power loop modules are connected with the liquid pipe branches;
outlets of the plurality of power loop modules are connected with the air pipe branch;
the liquid pipe branch is communicated with the air pipe branch; and the pipeline between the liquid pipe branch and the gas pipe branch is thermally coupled with the heat exchangers of the plurality of concentrated heat pipe cold source modules;
a compressor and a second filter are also connected in series between the first liquid storage tank and the heat exchanger; a sprayer is also arranged above the condenser;
the method comprises the following steps:
1) judging whether the difference between the temperature of the environment where the heat pipe evaporator is located and the first preset threshold value is greater than or equal to the temperature of the environment where the condenser is located or not under the condition that the refrigeration system needs to be used for refrigeration; if yes, executing step 2); if not, executing the step 3);
2) keeping the compressor in a closed state;
3) judging whether the temperature of the environment where the condenser is located is greater than the difference between the temperature of the environment where the heat pipe evaporator is located and a first preset threshold value, and whether the temperature of the environment where the condenser is located is less than or equal to the difference between the temperature of the environment where the heat pipe evaporator is located and a second preset threshold value are both true, wherein the first preset threshold value is greater than the second preset threshold value; if yes, executing step 4); if not, executing the step 5);
4) when the preset condition of spraying is met, starting the sprayer until the temperature of the environment where the condenser is located is greater than the difference between the temperature of the environment where the heat pipe evaporator is located and a first preset threshold value;
5) judging whether the temperature of the environment where the condenser is located is greater than the difference between the temperature of the environment where the heat pipe evaporator is located and a second preset threshold value, and whether the temperature of the environment where the condenser is located is less than or equal to the difference between the temperature of the environment where the heat pipe evaporator is located and a third preset threshold value is true, wherein the second preset threshold value is greater than the third preset threshold value; if yes, executing step 6); if not, executing step 7);
6) starting the compressor and additionally starting at least one power loop module; and starting the sprayer under the condition of meeting the spraying condition;
7) and starting the compressor.
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