Modular machine room cooling system and method

Abstract

The invention discloses a modular machine room cooling system and method.The system comprises a power mechanical module and a machine room module, and the power mechanical module and the machine room module exchange heat through a heat exchanger; the power mechanical module comprises a carbon dioxide storage tank, a compressor, a condenser and an evaporator, a first inlet of the heat exchanger is connected with a first outlet of the condenser, a first outlet of the heat exchanger is connected with a first inlet of the evaporator, and a second outlet of the evaporator is connected with the carbon dioxide storage tank; the machine room module comprises a CO2 secondary refrigerant storage tank, a secondary refrigerant side circulating pump and a machine room module which are connected in sequence, an outlet of the machine room module is connected with a second inlet of the heat exchanger, and a second outlet of the heat exchanger is connected with the CO2 secondary refrigerant storage tank. The method comprises the following steps: step 1, carbon dioxide refrigeration of a machine room module; and 2, controlling the temperature of the machine room module. The system is reasonable in design and is divided into the matched power machine module and the machine room module, and the carbon dioxide secondary refrigerant is effectively utilized for heat exchange and refrigeration of the machine room module.

Description

Technical Field

[0001] The invention belongs to the technical field of machine room module refrigeration, and in particular relates to a modular machine room cooling system. Background Art

[0002] Since the 21st century, with the rapid development of the economy and society, data center construction has blossomed all over the world. In the future social development, data will be an irreplaceable strategic resource, as important as natural resources and human resources. Data plays a vital role in the lifeline fields such as military, science and technology, and medical education. The computer rooms of existing data centers are mostly traditional buildings, which are difficult to adapt to the further development requirements of high power and high density. The modular data center is born to respond to the development trends of cloud computing, virtualization, centralization, and high density servers. It adopts modular design to minimize the coupling of infrastructure to the computer room environment. In addition, the computer rooms of data centers currently use evaporative cooling air-conditioning technology, which uses water as the cooling medium. Waterproof measures need to be taken to prevent water leakage from affecting the equipment in the computer room.

[0003] Therefore, a reasonably designed modular computer room cooling system is needed, which is divided into a supporting power machinery module and a computer room module, can be constructed in a split manner, and effectively utilizes carbon dioxide refrigerant to perform heat exchange and cooling on the computer room modules, thereby realizing water-free construction of the computer room modules. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a modular computer room cooling system in view of the deficiencies in the above-mentioned prior art. The system is reasonably designed and is divided into a supporting power machinery module and a computer room module. It can be constructed in a split manner and effectively utilizes carbon dioxide refrigerant to perform heat exchange and cooling on the computer room module, thereby realizing water-free construction of the computer room module.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a modular machine room cooling system, characterized in that: it comprises a power machinery module and a machine room module, and the power machinery module and the machine room module exchange heat through a heat exchanger;

[0006] The power machinery module includes a carbon dioxide gas storage tank, a compressor, a condenser and an evaporator, the first inlet of the heat exchanger is connected to the first outlet of the condenser, the first outlet of the heat exchanger is connected to the first inlet of the evaporator, and the second outlet of the evaporator is connected to the carbon dioxide gas storage tank;

[0007] The machine room module comprises a CO2 refrigerant storage tank, a refrigerant side circulation pump and a machine room which are connected in sequence. The outlet of the machine room is connected to the second inlet of the heat exchanger, and the second outlet of the heat exchanger is connected to the CO2 refrigerant storage tank.

[0008] In the above-mentioned modular computer room cooling system, the second inlet of the condenser is connected to the cold medium storage tank, the second outlet of the condenser is connected to the hot medium storage tank, a circulating pump is arranged between the second outlet of the condenser and the hot medium storage tank, the hot medium storage tank is connected to the first inlet of the evaporator, and the first outlet of the evaporator is connected to the cold medium storage tank.

[0009] In the above-mentioned modular machine room cooling system, the second outlet of the evaporator is connected to the second compressor through the fifth pipeline, the second compressor is connected to the drying filter through the sixth pipeline, the drying filter is connected to the carbon dioxide storage tank through the seventh pipeline, and the fifth pipeline is provided with a third regulating valve.

[0010] In the modular machine room cooling system described above, the carbon dioxide gas storage tank is connected to the compressor through a first pipeline, the compressor outlet is connected to the first inlet of the condenser through a second pipeline, the first outlet of the condenser is connected to the first inlet of the heat exchanger through a third pipeline, and the third pipeline is provided with a first regulating valve;

[0011] The first outlet of the heat exchanger is connected to the first inlet of the evaporator through a fourth pipeline, and a second regulating valve is arranged on the fourth pipeline.

[0012] In the above-mentioned modular computer room cooling system, a delivery pipeline is provided between the refrigerant side circulation pump and the computer room, a refrigerant regulating valve is provided on the delivery pipeline, an internal temperature sensor is provided inside the computer room, and the internal temperature sensor is connected to a computer.

[0013] A modular computer room cooling method is also provided, characterized in that the method comprises the following steps:

[0014] Step 1: CO2 cooling of computer room modules:

[0015] Step 101, the CO2 coolant in the CO2 coolant storage tank is input into the carbon dioxide air cooler in the machine room under the action of the coolant side circulation pump, and the carbon dioxide air cooler cools the machine room;

[0016] At the same time, the carbon dioxide gas in the carbon dioxide storage tank enters the compressor for compression through the first pipeline, and the compressed carbon dioxide gas enters the first inlet of the condenser through the second pipeline, and outputs the liquid carbon dioxide on the left through the heat exchange of the condenser. The liquid carbon dioxide on the left enters the first inlet of the heat exchanger through the third pipeline, and the right-side gaseous carbon dioxide output from the machine room enters the second inlet of the heat exchanger. The left-side liquid carbon dioxide exchanges heat with the right-side gaseous carbon dioxide, and the right-side gaseous carbon dioxide outputs the cooled liquid carbon dioxide through the second outlet of the heat exchanger. The cooled liquid carbon dioxide enters the CO2 refrigerant storage tank for storage and recycling, and the left-side liquid carbon dioxide outputs the gas-liquid mixed carbon dioxide through the first outlet of the heat exchanger; wherein, the cold medium in the cold medium storage tank enters the second inlet of the condenser to perform heat exchange with the compressed carbon dioxide gas, and the compressed carbon dioxide gas is cooled to form the liquid carbon dioxide on the left. At the same time, the cold medium absorbs heat through the condenser to become a hot medium, and the hot medium enters the hot medium storage tank for storage under the action of the circulating pump;

[0017] Step 102: The gas-liquid mixed carbon dioxide outputted from the first outlet of the heat exchanger enters the second inlet of the evaporator through the fourth pipeline, and the heat medium in the heat medium storage tank enters the first inlet of the evaporator. The heat medium and the gas-liquid mixed carbon dioxide undergo secondary heat exchange. The heat medium passes through the evaporator to become cold medium and is stored in the cold medium storage tank. The gas-liquid mixed carbon dioxide passes through the evaporator to become gaseous carbon dioxide after heat exchange.

[0018] Step 103, the gaseous carbon dioxide after heat exchange enters the second compressor through the fifth pipeline for pressurization, and the pressurized gaseous carbon dioxide is filtered through a drying filter to obtain filtered carbon dioxide gas;

[0019] Step 104, the filtered carbon dioxide gas enters the carbon dioxide gas storage tank through the seventh pipeline for collection and recirculation;

[0020] Step 2: Temperature control of the computer room module:

[0021] Step 201: When the carbon dioxide cooling fan cools the air inside the computer room, the internal temperature sensor detects the temperature inside the computer room in real time according to the set sampling time Δt, obtains the internal temperature detection value at each sampling time and sends it to the computer;

[0022] Step 202: The computer determines the internal temperature according to the detected internal temperature value and the internal temperature setting value T set , obtain the temperature deviation value e at the kth moment, the temperature deviation value e at the k-1th moment, and the temperature deviation value e at the k-2th moment; wherein k is a positive integer greater than 2;

[0023] Step 203: According to Δe=ee and Δe=ee, obtain the deviation change Δe at the kth moment and the deviation change Δe at the k-1th moment;

[0024] Step 204, setting parameters to be optimized in the expert PID controller; wherein the parameters to be optimized include gain amplification coefficient k1, gain suppression coefficient k2, proportional adjustment coefficient kp, integral adjustment coefficient ki, differential adjustment coefficient kd, maximum absolute deviation value Mmax, minimum absolute deviation value Mmin and intermediate absolute deviation value Mmid;

[0025] Step 205: The computer takes the parameter to be optimized as the optimization target, adopts the particle swarm optimization algorithm, sets the particle swarm size to 50-80, the particle dimension to 8, the maximum number of iterations to 60-90, the inertia weight ω to 0.4-0.9, the individual learning factor C1 to 1-2, the group learning factor C2 to 1-2, sets the first random number r1 and the second random number r2 to 0-1, sets the parameter to be optimized as the position of each particle, sets the search range of the parameter to be optimized, and randomly initializes the position and speed of each particle;

[0026] Step 206: Input the parameters to be optimized in the position of each particle into Matlab software and simulate based on the expert PID controller to obtain the system rise time T r , overshoot O s and steady-state error SSE;

[0027] Construct fitness function J = ω1 × T r +ω2×O s +ω3×|SSE|; where J represents fitness, ω1 represents the first weight, and ω1=0.2; ω2 represents the second weight, and ω2=0.3; ω3 represents the third weight, and ω3=0.5;

[0028] Step 207, using the fitness function as the objective function, iteratively updating the particle position until the maximum number of iterations is met, and then returning to the optimal particle position after the iterative process is completed, and the optimal particle position is the optimal value of the parameter to be optimized;

[0029] Step 208: assign the optimal values ​​of the gain amplification coefficient k1, the gain suppression coefficient k2, the proportional adjustment coefficient kp, the integral adjustment coefficient ki, the differential adjustment coefficient kd, the maximum absolute value of the deviation Mmax, the minimum absolute value of the deviation Mmin, and the intermediate absolute value of the deviation Mmid to the expert PID controller, and input the deviation change Δe at the kth moment and the deviation change Δe at the k-1th moment to obtain the control amount of the refrigerant regulating valve until the internal temperature detection value is close to the internal temperature setting value T set .

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] 1. Carbon dioxide is set as the refrigeration coolant in the computer room module of the present invention. It has low viscosity and large cooling capacity. It is an environmentally friendly coolant. It adopts a phase change heat transfer method. The system pipeline and supporting equipment are easy to miniaturize and compact, and are suitable for modular layout.

[0032] 2. The right side gaseous carbon dioxide output by the computer room module of the present invention enters the heat exchanger, and the heat exchange output is cooled liquid carbon dioxide, which enters the CO2 refrigerant storage tank for storage and recycling after cooling, which can further save the amount of carbon dioxide refrigerant used in the main system of the computer room module. The computer room side directly enters the computer room for heat exchange through the carbon dioxide cooling fan, and there is no water system involved on the computer room side, which is conducive to the water-free construction of the computer room module.

[0033] 3. In the present invention, the gas-liquid mixed carbon dioxide after passing through the heat exchanger enters the evaporator for secondary evaporation and heat exchange, and the gaseous carbon dioxide after heat exchange enters the carbon dioxide gas storage tank for collection and recirculation; a hot medium storage tank and a cold medium storage tank are arranged between the condenser and the evaporator, which can realize energy and heat storage, further utilize waste heat resources, and improve energy utilization.

[0034] 4. The present invention adopts a modular design, dividing the data center module into a supporting power machinery module and a computer room module, which can be constructed in a split and streamlined manner, which is conducive to its rapid construction and has better engineering applicability and economic benefits.

[0035] 5. In the temperature control process of the computer room module, the present invention adopts an expert PID controller and a particle swarm optimization algorithm. The particle swarm optimization algorithm is first used to optimize the parameters to be optimized in the expert PID controller, and then the optimal values ​​of the parameters to be optimized are input into the expert PID controller to obtain the control amount of the refrigerant regulating valve until the internal temperature detection value is close to the internal temperature setting value, which can achieve the advantages of fast response, precise tracking, and strong adaptability.

[0036] In summary, the present invention is reasonably designed and is divided into a supporting power machinery module and a computer room module, which can be constructed in a split manner. It can also effectively utilize carbon dioxide coolant to perform heat exchange and cooling on the computer room module, thereby realizing water-free construction of the computer room module.

[0037] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of the present invention.

[0039] Description of reference numerals:

[0040] 1—CO2 gas storage tank; 2—Compressor; 3—Condenser;

[0041] 4—first regulating valve; 5—heat exchanger; 6—second regulating valve;

[0042] 7—evaporator; 8—third regulating valve; 9—second compressor;

[0043] 10—drying filter; 11—CO2 coolant storage tank; 12—coolant side circulation pump;

[0044] 13—machine room; 13-1—refrigerant regulating valve; 14—circulating pump;

[0045] 15—hot medium storage tank; 17—cold medium storage tank. DETAILED DESCRIPTION

[0046] like Figure 1 As shown, a modular machine room cooling system of the present invention includes a power machinery module and a machine room module, and the power machinery module and the machine room module exchange heat through a heat exchanger 5;

[0047] The power mechanical module includes a carbon dioxide gas storage tank 1, a compressor 2, a condenser 3 and an evaporator 7, the first inlet of the heat exchanger 5 is connected to the first outlet of the condenser 3, the first outlet of the heat exchanger 5 is connected to the first inlet of the evaporator 7, and the second outlet of the evaporator 7 is connected to the carbon dioxide gas storage tank 1;

[0048] The machine room module includes a CO2 refrigerant storage tank 11, a refrigerant side circulation pump 12 and a machine room 13 which are connected in sequence. The outlet of the machine room 13 is connected to the second inlet of the heat exchanger 5, and the second outlet of the heat exchanger 5 is connected to the CO2 refrigerant storage tank 11.

[0049] In this embodiment, the second inlet of the condenser 3 is connected to the cold medium storage tank 17, the second outlet of the condenser 3 is connected to the hot medium storage tank 15, a circulating pump 14 is arranged between the second outlet of the condenser 3 and the hot medium storage tank 15, the hot medium storage tank 15 is connected to the first inlet of the evaporator 7, and the first outlet of the evaporator 7 is connected to the cold medium storage tank 17.

[0050] In this embodiment, the second outlet of the evaporator 7 is connected to the second compressor 9 through the fifth pipeline, the second compressor 9 is connected to the drying filter 10 through the sixth pipeline, the drying filter 10 is connected to the carbon dioxide storage tank 1 through the seventh pipeline, and the third regulating valve 8 is provided on the fifth pipeline.

[0051] In this embodiment, the carbon dioxide gas storage tank 1 is connected to the compressor 2 through a first pipeline, the outlet of the compressor 2 is connected to the first inlet of the condenser 3 through a second pipeline, the first outlet of the condenser 3 is connected to the first inlet of the heat exchanger 5 through a third pipeline, and the third pipeline is provided with a first regulating valve 4;

[0052] The first outlet of the heat exchanger 5 is connected to the first inlet of the evaporator 7 through a fourth pipeline, and a second regulating valve 6 is arranged on the fourth pipeline.

[0053] In this embodiment, a delivery pipeline is provided between the refrigerant side circulation pump 12 and the machine room 13, a refrigerant regulating valve 13-1 is provided on the delivery pipeline, an internal temperature sensor is provided inside the machine room 13, and the internal temperature sensor is connected to a computer.

[0054] In this embodiment, during the specific implementation, the power machinery module and the computer room module are prefabricated independently, connected front to back during operation, and connected through pipelines for heat and cold transmission. The power machinery module uses a carbon dioxide cooling system for refrigeration, and the computer room module also adopts a modular design. The internal air cooler does not contain other refrigeration equipment, and uses carbon dioxide cooling agent for direct cooling and heat exchange;

[0055] In this embodiment, during specific implementation, the outlet of the carbon dioxide storage tank 1 is connected to the inlet of the compressor 2. The compressor 2 adopts a magnetic levitation oil-free variable frequency centrifugal compressor with an oil-free design, which solves the problem of thermal resistance of the lubricating oil film and improves the heat exchange efficiency of the two devices; there is no need to regularly replace the lubricating oil, which reduces maintenance costs; there is no need to consider the oil return problem of the compressor, which simplifies the system pipeline design.

[0056] In this embodiment, during the specific implementation, a condenser 3 is provided, and a first regulating valve 4 is connected to the condenser 3. The first regulating valve 4 is provided on the output pipeline of the condenser 3, and the throttling control of the valve is used to ensure that the refrigerant flow of the liquid carbon dioxide on the left side matches the load of the condenser 3;

[0057] In this embodiment, during specific implementation, the first regulating valve 4 is connected to a heat exchanger 5 for performing the first evaporation heat exchange with the cooling circuit;

[0058] The heat exchanger 5 is connected to the first outlet of the condenser 3. The heat exchanger 5 performs condensation heat exchange on the refrigerant side. After the heat exchange is completed, the liquid carbon dioxide is cooled and flows back to the CO2 refrigerant storage tank 11. The refrigerant side circulation pump 12 provides circulation power. The refrigerant side does not require a compressor, thereby avoiding the influence of the oil film on the heat transfer of the computer room module and reducing the energy consumption level.

[0059] In this embodiment, during specific implementation, the heat exchanger 5 is connected to the third regulating valve 6, and the flow rate of the gas-liquid mixed carbon dioxide is ensured to match the load of the heat exchanger 5 through valve throttling control; the third regulating valve 6 is connected to the evaporator 7 for secondary evaporation heat exchange of the system;

[0060] At the same time, an energy storage circuit can be provided between the evaporator 7 and the condenser 3 to store the waste heat through the hot medium storage tank 15 and to transmit the power through the circulating pump 14; the cold medium after passing through the evaporator 7 is stored through the cold medium storage tank 17, which can realize both condensation and evaporation, thus saving energy.

[0061] In this embodiment, during the specific implementation, under the computer room module, since the volume and scale of the computer room are smaller than those of the traditional computer room module, the volume of waste heat resources generated is smaller.

[0062] In this embodiment, during the specific implementation, a drying filter 10 is provided to perform moisture adsorption and impurity filtering, so that the filtered carbon dioxide gas can be collected and recycled in the carbon dioxide storage tank 1 .

[0063] In this embodiment, during specific implementation, the CO2 refrigerant storage tank 11 is composed of an inner tank, an outer shell, a shock absorbing device, a pressure gauge, a safety valve, an exhaust valve, etc.; the material is preferably glass fiber reinforced plastics or stainless steel, etc.; and it has inlet and outlet ports on both sides.

[0064] A control method for a modular computer room cooling system, the method comprising the following steps:

[0065] Step 1: CO2 cooling of computer room modules:

[0066] Step 101, the CO2 coolant in the CO2 coolant storage tank 11 is input into the carbon dioxide air cooler in the machine room 13 under the action of the coolant side circulation pump 12, and the carbon dioxide air cooler cools the machine room 13;

[0067] At the same time, the carbon dioxide gas in the carbon dioxide storage tank 1 enters the compressor 2 for compression through the first pipeline, and the compressed carbon dioxide gas enters the first inlet of the condenser 3 through the second pipeline, and outputs the left liquid carbon dioxide through the heat exchange of the condenser 3. The left liquid carbon dioxide enters the first inlet of the heat exchanger 5 through the third pipeline, and the right gaseous carbon dioxide output from the machine room 13 enters the second inlet of the heat exchanger 5. The left liquid carbon dioxide exchanges heat with the right gaseous carbon dioxide, and the right gaseous carbon dioxide outputs the cooled liquid carbon dioxide through the second outlet of the heat exchanger 5. The cooled liquid carbon dioxide enters the CO2 refrigerant storage tank 11 for storage and recycling, and the left liquid carbon dioxide outputs gas-liquid mixed carbon dioxide through the first outlet of the heat exchanger 5; wherein, the cold medium in the cold medium storage tank 17 enters the second inlet of the condenser 3 to perform heat exchange with the compressed carbon dioxide gas, and the compressed carbon dioxide gas is cooled to form the left liquid carbon dioxide. At the same time, the cold medium absorbs heat through the condenser 3 to become a hot medium, and the hot medium enters the hot medium storage tank 15 for storage under the action of the circulating pump 14;

[0068] Step 102: the gas-liquid mixed carbon dioxide outputted from the first outlet of the heat exchanger 5 enters the second inlet of the evaporator 7 through the fourth pipeline, the heat medium in the heat medium storage tank 15 enters the first inlet of the evaporator 7, the heat medium and the gas-liquid mixed carbon dioxide exchange heat twice, the heat medium passes through the evaporator 7 to become cold medium stored in the cold medium storage tank 17, and the gas-liquid mixed carbon dioxide passes through the evaporator 7 to become gaseous carbon dioxide after heat exchange;

[0069] Step 103, the gaseous carbon dioxide after heat exchange enters the second compressor 9 through the fifth pipeline for pressurization, and the pressurized gaseous carbon dioxide is filtered through the drying filter 10 to obtain filtered carbon dioxide gas;

[0070] Step 104, the filtered carbon dioxide gas enters the carbon dioxide gas storage tank 1 through the seventh pipeline for collection and recirculation;

[0071] Step 2: Temperature control of the computer room module:

[0072] Step 201: When the carbon dioxide cooling fan cools the air inside the computer room 13, the internal temperature sensor detects the temperature inside the computer room 13 in real time according to the set sampling time Δt, obtains the internal temperature detection value at each sampling time and sends it to the computer;

[0073] Step 202: The computer determines the internal temperature according to the detected internal temperature value and the internal temperature setting value T set , obtain the temperature deviation value ek at the kth moment, the temperature deviation value ek-1 at the k-1th moment, and the temperature deviation value ek-2 at the k-2th moment; wherein k is a positive integer greater than 2;

[0074] Step 203, according to Δek=ek-ek-1 and Δek-1=ek-1-ek-2, obtain the deviation change Δek at the kth moment and the deviation change Δek-1 at the k-1th moment;

[0075] Step 204, setting parameters to be optimized in the expert PID controller; wherein the parameters to be optimized include gain amplification coefficient k1, gain suppression coefficient k2, proportional adjustment coefficient kp, integral adjustment coefficient ki, differential adjustment coefficient kd, maximum absolute deviation value Mmax, minimum absolute deviation value Mmin and intermediate absolute deviation value Mmid;

[0076] Step 205: The computer takes the parameter to be optimized as the optimization target, adopts the particle swarm optimization algorithm, sets the particle swarm size to 50-80, the particle dimension to 8, the maximum number of iterations to 60-90, the inertia weight ω to 0.4-0.9, the individual learning factor C1 to 1-2, the group learning factor C2 to 1-2, sets the first random number r1 and the second random number r2 to 0-1, sets the parameter to be optimized as the position of each particle, sets the search range of the parameter to be optimized, and randomly initializes the position and speed of each particle;

[0077] Step 206: Input the parameters to be optimized in the position of each particle into Matlab software and simulate based on the expert PID controller to obtain the system rise time T r , overshoot O s and steady-state error SSE;

[0078] Construct fitness function J = ω1 × T r +ω2×O s +ω3×|SSE|; where J represents fitness, ω1 represents the first weight, and ω1=0.2; ω2 represents the second weight, and ω2=0.3; ω3 represents the third weight, and ω3=0.5;

[0079] Step 207, using the fitness function as the objective function, iteratively updating the particle position until the maximum number of iterations is met, and then returning to the optimal position of the particle after the iterative process is completed, and the optimal position of the particle is the optimal value of the parameter to be optimized;

[0080] Step 208, assign the optimal values ​​of the gain amplification coefficient k1, the gain suppression coefficient k2, the proportional adjustment coefficient kp, the integral adjustment coefficient ki, the differential adjustment coefficient kd, the maximum absolute value Mmax, the minimum absolute value Mmin and the intermediate absolute value Mmid to the expert PID controller, and input the deviation change Δek at the kth moment and the deviation change Δek-1 at the k-1th moment to obtain the control amount of the brine regulating valve 13-1 until the internal temperature detection value is close to the internal temperature setting value T set .

[0081] In this embodiment, during specific implementation, the sampling time Δt and the internal temperature setting value T set It is set according to actual requirements and is not specifically limited.

[0082] In this embodiment, the expert PID controller may refer to an expert PID controller known in the art.

[0083] In this embodiment, during specific implementation, the inertia weight ω is 0.6, the individual learning factor C1 is 2, the group learning factor C2 is 2, and the first random number r1 and the second random number r2 are set to be 0-1.

[0084] In this embodiment, during specific implementation, the search range of the parameters to be optimized is as follows:

[0085] The search range of the gain amplification coefficient k1 is 1 to 10, the search range of the gain suppression coefficient k2 is 0.1 to 1, the search range of the proportional adjustment coefficient kp is 0.01 to 100, the search range of the integral adjustment coefficient ki is 0.01 to 10, the search range of the differential adjustment coefficient kd is 0.01 to 10, the search range of the maximum absolute value of the deviation Mmax is 5 to 10, the search range of the minimum absolute value of the deviation Mmin is 0 to 0.5, and the search range of the middle absolute value of the deviation Mmid is 0.5 to 6.

[0086] In this embodiment, during specific implementation, the maximum number of iterations is 200 to 500.

[0087] In this embodiment, when the internal temperature detection value is close to the internal temperature setting value T set That is, the internal temperature detection value and the internal temperature setting value T set The deviation is minimal.

[0088] In summary, the present invention is reasonably designed and is divided into a supporting power machinery module and a computer room module, which can be constructed in a split manner. It can also effectively utilize carbon dioxide coolant to perform heat exchange and cooling on the computer room module, thereby realizing water-free construction of the computer room module.

[0089] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A modular computer room cooling system, characterized in that: It comprises a power machinery module and a machine room module, wherein the power machinery module and the machine room module exchange heat via a heat exchanger (5); The power machinery module comprises a carbon dioxide gas storage tank (1), a compressor (2), a condenser (3) and an evaporator (7); a first inlet of the heat exchanger (5) is connected to a first outlet of the condenser (3); a first outlet of the heat exchanger (5) is connected to a first inlet of the evaporator (7); and a second outlet of the evaporator (7) is connected to the carbon dioxide gas storage tank (1); The machine room module comprises a CO2 coolant storage tank (11), a coolant side circulation pump (12) and a machine room (13) which are connected in sequence, the outlet of the machine room (13) is connected to the second inlet of the heat exchanger (5), and the second outlet of the heat exchanger (5) is connected to the CO2 coolant storage tank (11).

2. A modular computer room cooling system according to claim 1, characterized in that: The second inlet of the condenser (3) is connected to a cold medium storage tank (17), the second outlet of the condenser (3) is connected to a hot medium storage tank (15), a circulation pump (14) is provided between the second outlet of the condenser (3) and the hot medium storage tank (15), the hot medium storage tank (15) is connected to a first inlet of the evaporator (7), and the first outlet of the evaporator (7) is connected to the cold medium storage tank (17).

3. A modular computer room cooling system according to claim 1, characterized in that: The second outlet of the evaporator (7) is connected to the second compressor (9) via a fifth pipeline, the second compressor (9) is connected to the drying filter (10) via a sixth pipeline, the drying filter (10) is connected to the carbon dioxide storage tank (1) via a seventh pipeline, and a third regulating valve (8) is provided on the fifth pipeline.

4. A modular computer room cooling system according to claim 1, characterized in that: The carbon dioxide storage tank (1) is connected to the compressor (2) via a first pipeline, the outlet of the compressor (2) is connected to the first inlet of the condenser (3) via a second pipeline, the first outlet of the condenser (3) is connected to the first inlet of the heat exchanger (5) via a third pipeline, and the third pipeline is provided with a first regulating valve (4); The first outlet of the heat exchanger (5) is connected to the first inlet of the evaporator (7) via a fourth pipeline, and a second regulating valve (6) is provided on the fourth pipeline.

5. A modular computer room cooling system according to claim 1, characterized in that: A delivery pipeline is provided between the refrigerant side circulation pump (12) and the machine room (13), a refrigerant regulating valve (13-1) is provided on the delivery pipeline, an internal temperature sensor is provided inside the machine room (13), and the internal temperature sensor is connected to a computer.

6. A method for cooling the modular computer room cooling system according to claim 5, characterized in that: The method comprises the following steps: Step 1: CO2 cooling of computer room modules: Step 101, the CO2 coolant in the CO2 coolant storage tank (11) is input into the carbon dioxide air cooler in the machine room (13) under the action of the coolant side circulation pump (12), and the carbon dioxide air cooler cools the machine room (13); At the same time, the carbon dioxide gas in the carbon dioxide storage tank (1) enters the compressor (2) through the first pipeline for compression, and the compressed carbon dioxide gas enters the first inlet of the condenser (3) through the second pipeline, and is output as liquid carbon dioxide on the left side through heat exchange in the condenser (3). The liquid carbon dioxide on the left side enters the first inlet of the heat exchanger (5) through the third pipeline, and the gaseous carbon dioxide on the right side output from the machine room (13) enters the second inlet of the heat exchanger (5). The liquid carbon dioxide on the left side exchanges heat with the gaseous carbon dioxide on the right side, and the gaseous carbon dioxide on the right side is output through the second outlet of the heat exchanger (5). The liquid carbon dioxide after cooling enters the CO2 refrigerant storage tank (11) for storage and recycling, and the left liquid carbon dioxide outputs gas-liquid mixed carbon dioxide through the first outlet of the heat exchanger (5); wherein the cold medium in the cold medium storage tank (17) enters the second inlet of the condenser (3) to perform heat exchange with the compressed carbon dioxide gas, and the compressed carbon dioxide gas is cooled to form the left liquid carbon dioxide. At the same time, the cold medium absorbs heat through the condenser (3) to become a hot medium, and the hot medium enters the hot medium storage tank (15) for storage under the action of the circulating pump (14); Step 102: the gas-liquid mixed carbon dioxide outputted from the first outlet of the heat exchanger (5) enters the second inlet of the evaporator (7) through the fourth pipeline, the heat medium in the heat medium storage tank (15) enters the first inlet of the evaporator (7), the heat medium and the gas-liquid mixed carbon dioxide undergo secondary heat exchange, the heat medium passes through the evaporator (7) to become cold medium and is stored in the cold medium storage tank (17), and the gas-liquid mixed carbon dioxide passes through the evaporator (7) to become gaseous carbon dioxide after heat exchange; Step 103, the gaseous carbon dioxide after heat exchange enters the second compressor (9) through the fifth pipeline for pressurization, and the pressurized gaseous carbon dioxide is filtered through a drying filter (10) to obtain filtered carbon dioxide gas; Step 104, the filtered carbon dioxide gas enters the carbon dioxide gas storage tank (1) through the seventh pipeline for collection and recirculation; Step 2: Temperature control of the computer room module: Step 201: When the carbon dioxide cooling fan cools the air inside the machine room (13), the internal temperature sensor detects the temperature inside the machine room (13) in real time according to the set sampling time Δt, obtains the internal temperature detection value at each sampling time and sends it to the computer; Step 202: The computer determines the internal temperature according to the detected internal temperature value and the internal temperature setting value T set , obtain the temperature deviation value e(k) at the kth moment, the temperature deviation value e(k-1) at the k-1th moment, and the temperature deviation value e(k-2) at the k-2th moment; wherein k is a positive integer greater than 2; Step 203: According to Δe(k)=e(k)-e(k-1) and Δe(k-1)=e(k-1)-e(k-2), obtain the deviation change Δe(k) at the kth moment and the deviation change Δe(k-1) at the k-1th moment; Step 204, setting parameters to be optimized in the expert PID controller; wherein the parameters to be optimized include gain amplification coefficient k1, gain suppression coefficient k2, proportional adjustment coefficient kp, integral adjustment coefficient ki, differential adjustment coefficient kd, maximum absolute deviation value Mmax, minimum absolute deviation value Mmin and intermediate absolute deviation value Mmid; Step 205: The computer takes the parameter to be optimized as the optimization target, adopts the particle swarm optimization algorithm, sets the particle swarm size to 50-80, the particle dimension to 8, the maximum number of iterations to 60-90, the inertia weight ω to 0.4-0.9, the individual learning factor C1 to 1-2, the group learning factor C2 to 1-2, sets the first random number r1 and the second random number r2 to 0-1, sets the parameter to be optimized as the position of each particle, sets the search range of the parameter to be optimized, and randomly initializes the position and speed of each particle; Step 206: Input the parameters to be optimized in the position of each particle into Matlab software and simulate based on the expert PID controller to obtain the system rise time T r , overshoot O s and steady-state error SSE; Construct fitness function J = ω1 × T r +ω2×O s +ω3×|SSE|; where J represents fitness, ω1 represents the first weight, and ω1=0.2; ω2 represents the second weight, and ω2=0.3; ω3 represents the third weight, and ω3=0.5; Step 207, using the fitness function as the objective function, iteratively updating the particle position until the maximum number of iterations is met, and then returning to the optimal particle position after the iterative process is completed, and the optimal particle position is the optimal value of the parameter to be optimized; Step 208, assign the optimal values ​​of the gain amplification coefficient k1, the gain suppression coefficient k2, the proportional adjustment coefficient kp, the integral adjustment coefficient ki, the differential adjustment coefficient kd, the maximum absolute value Mmax, the minimum absolute value Mmin and the intermediate absolute value Mmid to the expert PID controller, and input the deviation change Δe(k) at the kth moment and the deviation change Δe(k-1) at the k-1th moment to obtain the control amount of the refrigerant regulating valve (13-1), until the internal temperature detection value approaches the internal temperature setting value T set .

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