CN105352211A - Direct-expansion type energy-saving air-conditioning system of machine room and control method thereof - Google Patents

Abstract

The present invention provides a direct expansion energy-saving air-conditioning system for a computer room, including a compressor installed in the computer room, a first throttle valve, a liquid storage tank, a second throttle valve, an evaporator, a gas storage tank, a sensor, a controller, The first valve, the second valve, the third valve, the temperature sensing probe, the liquid level sensing device and the condenser arranged outside the machine room, and the evaporator is arranged in the corresponding server cabinet; the compressor, the condenser, the first section The flow valve, the first valve, the liquid storage tank, the second valve, the second throttle valve, the evaporator, the gas storage tank and the third valve are connected end to end in sequence, the temperature sensing probe is set in the server cabinet, and the liquid level sensing device is set in the In the liquid storage tank, the temperature sensing probe and the liquid level sensing device are connected to the sensor; the controller is respectively connected to the compressor, the first valve, the second valve, the third valve and the sensor. The invention also provides a control method for the energy-saving air conditioner of the direct expansion machine room, which solves the problem of heat discharge in the machine room, reduces energy consumption, and reduces costs.

Description

A direct expansion energy-saving air-conditioning system for a computer room and its control method

technical field

The invention relates to the field of an energy-saving air conditioner for a machine room, in particular to a direct expansion energy-saving air-conditioner system for a machine room and a control method thereof.

Background technique

With the rapid development of network technology, the number and energy consumption of data equipment rooms and communication base stations are increasing day by day. At present, the existing computer room air conditioners are generally direct expansion computer room air conditioners. The direct expansion computer room air conditioners refer to the air conditioners that absorb heat from the room and transfer it to the outdoor air through the condenser. The best way is to blow cold air from the bottom of the server cabinet through the space under the floor under the action of the fan to take away the heat in the server cabinet. Although this temperature control method can meet the temperature control requirements of the equipment room, it causes some problems:

1) The air conditioner in the computer room adopts the continuous operation of vapor compression refrigeration to control the indoor temperature, which consumes a lot of energy and results in high operating costs;

2) The air conditioner in the computer room is mostly an all-air system. The air supply pipe of the fan is connected to the bottom of the server cabinet through the floor. Circulation; in this way, the refrigeration unit and the server cabinet cannot be effectively separated, resulting in a lot of noise; at the same time, this way of blowing down the air puts forward higher requirements for the height of the building;

3) The load borne by the conventional computer room air conditioner includes not only the load of equipment such as server cabinets, but also the load of the building envelope of the machine room; in order to reduce the load of the building envelope of the machine room, the insulation and sealing of the building envelope Sexuality puts forward higher demands.

Existing energy-saving technologies for computer room air conditioners mainly use the cooling capacity of outdoor fresh air to eliminate the heat in the computer room during transitional seasons or when the outdoor temperature is relatively cool in winter. Chinese patents CN200820123459.0, CN200910088535.8, and CN201010221372.9 all adopt heat pipe technology, and use the cooling capacity of outdoor fresh air to eliminate the heat in the machine room. Although these measures solve the problem of normal operation of air-conditioning equipment, they are limited in some fully enclosed machine room applications.

Contents of the invention

One of the technical problems to be solved by the present invention is to provide a direct expansion energy-saving air-conditioning system for computer rooms. Using the principle of the direct expansion heat pump system, the evaporator is directly placed in the corresponding server cabinet, and the sensor is based on the temperature in the server cabinet. The liquid level sensing device senses the liquid level change in the liquid storage tank, cooperates with the controller, and selects "compressor refrigeration cycle mode", "non-compressor refrigeration cycle mode" and "semi-compressor refrigeration cycle mode", which can Effectively reduce the air-conditioning load, solve the problem of heat dissipation in the computer room, and greatly reduce the running time of the compressor and reduce energy consumption.

One of the technical problems to be solved in the present invention is achieved in this way:

A direct expansion energy-saving air-conditioning system for a computer room, the energy-saving air-conditioning system for a computer room includes a compressor installed in the computer room, a first throttle valve, a liquid storage tank, a second throttle valve, an evaporator, an air storage tank, a sensor, A controller, a first valve, a second valve, a third valve, a temperature sensing probe, a liquid level sensing device, and a condenser arranged outside the machine room, and the evaporator is arranged in a corresponding server cabinet;

The inlet pipe of the compressor is connected to one end of the third valve, the exhaust pipe of the compressor is connected to the inlet of the condenser; one end of the first throttle valve is connected to the outlet of the condenser connected, the other end of the first throttle valve is connected to one end of the first valve; the inlet of the liquid storage tank is connected to the other end of the first valve, and the outlet of the liquid storage tank is connected to the One end of the second valve is connected; one end of the second throttle valve is connected with the other end of the second valve, and the other end of the second throttle valve is connected with the inlet of the evaporator; the outlet of the evaporator connected to the inlet of the gas storage tank; the outlet of the gas storage tank is connected to the other end of the third valve; the temperature sensing probe is set in the server cabinet, and the liquid level sensing device is set in the The liquid storage tank, and the temperature probe and the liquid level sensing device are connected to the sensor; the controller is connected with the compressor, the first valve, the second valve, the The third valve is connected to the sensor.

Further, the first valve, the second valve and the third valve are all electromagnetic valves.

The second technical problem to be solved by the present invention is to provide a control method for direct expansion energy-saving air-conditioning in computer rooms. Using the principle of direct expansion heat pump system, the evaporator is directly placed in the corresponding server cabinet. The temperature change and the liquid level sensing device senses the liquid level change in the liquid storage tank, and cooperates with the controller to select "compressor refrigeration cycle mode", "non-compressor refrigeration cycle mode" and "semi-compressor refrigeration cycle mode" , can effectively solve the problem of heat dissipation in the computer room, and greatly reduce the running time of the compressor and reduce energy consumption.

Two of problem of the present invention is realized like this:

A control method of a direct expansion energy-saving air conditioner for a computer room, the method needs to provide the above-mentioned direct expansion energy-saving air conditioner for a computer room, and the method specifically includes the following steps:

Step 10. Set the boundary value T _o of the temperature T _{in in} the server cabinet; set the boundary value V _l1 and threshold V _l2 of the liquid level V _{in in} the liquid storage tank; set the energy-saving air-conditioning system in the computer room There are three refrigeration cycle modes, namely compressor refrigeration cycle mode, non-compressor refrigeration cycle mode and semi-compressor refrigeration cycle mode;

Step 20, the sensor continuously detects the temperature T _{in in} the server cabinet and the liquid level V _{in in} the liquid storage tank, and when T _in >T _o , enters the refrigeration cycle mode of the compressor, and the sensor Give the controller a signal command, the controller opens the compressor, the first valve, the second valve and the third valve, and the compressor absorbs the low temperature in the gas storage tank After the low-pressure refrigerant vapor is compressed into high-temperature and high-pressure refrigerant vapor, it is cooled and condensed into high-temperature and high-pressure refrigerant liquid by the condenser outside the machine room, and then throttled by the first throttle valve into low-temperature and low-pressure refrigerant After the liquid enters the liquid storage tank, after being throttled by the second throttle valve, the low-temperature and low-pressure refrigerant liquid enters the evaporator to absorb heat and vaporize into low-temperature and low-pressure refrigerant vapor, and then enters the gas storage tank, is sucked by the compressor again, and circulates repeatedly; at this time, the temperature T _{in in} the server cabinet keeps dropping, and as the temperature in the server cabinet drops, the refrigerant liquid in the liquid storage tank The less the amount used for the evaporation of the server cabinet, the more the amount stored in the liquid storage tank, so that the liquid level V _{in in} the liquid storage tank continues to rise until the sensor detects the When the temperature T _{in in} the server cabinet ≤ T _o and the liquid level V _{in in} the liquid storage tank satisfies the range V _l1 <V _in <V _l2 , enter step 30;

Step 30, enter the non-compressor refrigeration cycle mode, the sensor sends a signal instruction to the controller, the controller closes the compressor, the first valve and the third valve, and opens the The second valve, after the low-temperature and low-pressure refrigerant liquid in the liquid storage tank is throttled by the second throttle valve, it enters the evaporator to absorb heat and vaporize into low-temperature and low-pressure refrigerant vapor, and then enters the gas storage tank. Tank, repeated circulation; at this time, the temperature T _{in in} the server cabinet is constantly rising, and as the temperature in the server cabinet rises, the refrigerant liquid in the liquid storage tank that is used for the evaporation of the server cabinet The greater the amount, the less the amount stored in the liquid storage tank, so that the liquid level V _{in in} the liquid storage tank continues to drop, when the sensor detects the temperature T _in the server cabinet ≤T _o and the liquid level V _{in in} the liquid storage tank satisfies the range 0<V _in ≤V _l1 , go to step 40; otherwise, go to step 20;

Step 40, enter the semi-compressor refrigeration cycle mode, the sensor sends a signal command to the controller, the controller turns on the compressor, the first valve, and the third valve, and turns down the The second valve opening, the compressor absorbs the low-temperature and low-pressure refrigerant vapor in the gas storage tank, compresses it into high-temperature and high-pressure refrigerant vapor, and condenses it into high-temperature and high-pressure refrigeration through the condenser outside the machine room. After being throttled by the first throttling valve, it becomes a low-temperature and low-pressure refrigerant liquid, and then enters the liquid storage tank. Part of the low-temperature and low-pressure refrigerant liquid stays in the liquid storage tank, and the other part of the low-temperature and low-pressure refrigerant liquid stays in the liquid storage tank. After the refrigerant liquid is throttled by the second throttle valve, this part of the low-temperature and low-pressure refrigerant liquid enters the evaporator to absorb heat and vaporize into low-temperature and low-pressure refrigerant vapor, and then enters the gas storage tank. The refrigerant vapor in the air storage tank is inhaled by the compressor again, and circulates repeatedly; at this time, the temperature T _{in in} the server cabinet keeps dropping, and as the temperature in the server cabinet drops, the liquid storage tank The less the amount of the refrigerant liquid in the refrigerant liquid used for evaporation of the server cabinet, the more the amount stored in the liquid storage tank, so that the liquid level V _{in in} the liquid storage tank continues to rise, when When the sensor detects that the temperature T _in ≤ T _o in the server cabinet and the liquid level V _{in in} the liquid storage tank satisfies the range V _in =V _l2 , enter step 30; otherwise, enter step 20.

Further, the control mode of the first valve, the second valve and the third valve is electric or hydraulic transmission.

The present invention has the following advantages:

1. The direct expansion type computer room energy-saving air-conditioning system and its control method of the present invention are reliable, reduce the running time of the compressor, and can ensure the normal and efficient operation of the computer room air conditioner;

2. The operation is simple. According to the change of the liquid level in the liquid storage tank and the setting of the operating conditions, the corresponding pipeline system can be switched by adjusting the switch of the valve;

3. The installation and construction are simple, and the operation cost is low after installation and commissioning;

4. The control method of the present invention can be controlled manually or automatically, and has strong applicability;

5. In the present invention, the evaporator is directly placed in the corresponding server cabinet, and its load only includes the load of the server cabinet, which reduces the strict requirements on the building envelope of the machine room;

6. The present invention has strong pertinence, and the service object of the air conditioner is aimed at the server cabinet.

Description of drawings

The present invention will be further described below in conjunction with the embodiments with reference to the accompanying drawings.

FIG. 1 is a structural schematic diagram of a direct expansion energy-saving air-conditioning system for a computer room according to the present invention.

Fig. 2 is an execution flow chart of a control method for a direct expansion energy-saving air conditioner in a computer room according to the present invention.

In the figure: 1-compressor, 2-condenser, 3-first throttle valve, 4-liquid storage tank, 5-second throttle valve, 6-evaporator, 7-gas storage tank, 8-sensor, 9-controller, 10-first valve, 11-second valve, 12-third valve, 13-temperature probe, 14-liquid level sensing device, 15-server cabinet.

detailed description

Please refer to Figure 1 and Figure 2, a direct expansion energy-saving air-conditioning system for a machine room according to the present invention, the energy-saving air-conditioning system for a machine room includes a compressor 1, a first throttle valve 3, and a liquid storage tank 4 arranged in the machine room , the second throttle valve 5, the evaporator 6, the gas tank 7, the sensor 8, the controller 9, the first valve 10, the second valve 11, the third valve 12, the temperature probe 13 and the liquid level sensing device 14 and The condenser 2 is arranged outside the machine room, and the evaporator 6 is arranged in the corresponding server cabinet 15;

The intake pipe of the compressor 1 is connected to one end of the third valve 12, the exhaust pipe of the compressor 1 is connected to the inlet of the condenser 2; one end of the first throttle valve 3 is connected to the The outlet of the condenser 2 is connected, the other end of the first throttle valve 3 is connected with one end of the first valve 10; the inlet of the liquid storage tank 4 is connected with the other end of the first valve 10, The outlet of the liquid storage tank 4 is connected to one end of the second valve 11; one end of the second throttle valve 5 is connected to the other end of the second valve 10, and the other end of the second throttle valve 5 It is connected with the inlet of the evaporator 6; the outlet of the evaporator 6 is connected with the inlet of the gas storage tank 7; the outlet of the gas storage tank 7 is connected with the other end of the third valve 12; the The temperature sensing probe 13 is located in the server cabinet 15, the liquid level sensing device 14 is located in the liquid storage tank 4, and the temperature sensing probe 13 and the liquid level sensing device 14 are connected to the The sensor 8 and the controller 9 are respectively connected with the first valve 10 , the second valve 11 , the third valve 12 and the sensor 8 .

Further, the first valve 10, the second valve 11 and the third valve 12 are all electromagnetic valves.

A control method of a direct expansion energy-saving air conditioner for a computer room according to the present invention, the method needs to provide the above-mentioned direct expansion energy-saving air conditioner for a computer room, and the method specifically includes the following steps:

Step 10, setting the temperature boundary value T _o in the server cabinet 15; setting the boundary value V _l1 and the threshold value V _l2 of the liquid level V _{in in} the liquid storage tank 4; setting the energy-saving air-conditioning system of the computer room There are three refrigeration cycle modes, namely compressor refrigeration cycle mode, non-compressor refrigeration cycle mode and semi-compressor refrigeration cycle mode;

Step 20, the sensor 8 continuously detects the temperature T _{in in} the server cabinet 15 and the liquid level V _{in in} the liquid storage tank 4, and when T _in >T _o , enters the compressor refrigeration cycle mode, The sensor 8 gives a signal instruction to the controller 9, and the controller 9 opens the compressor 1, the first valve 10, the second valve 11 and the third valve 12, and the compressor Machine 1 absorbs the low-temperature and low-pressure refrigerant vapor in the gas storage tank 7, compresses it into high-temperature and high-pressure refrigerant vapor, and condenses it into high-temperature and high-pressure refrigerant liquid through the condenser 2 outside the machine room. After the first throttling valve 3 throttles the low-temperature and low-pressure refrigerant liquid, it enters the liquid storage tank 4, and after being throttled by the second throttle valve 5, the low-temperature and low-pressure refrigerant liquid enters the evaporator 6 absorb heat and vaporize into low-temperature and low-pressure refrigerant vapor, enter the gas storage tank 7, be sucked by the compressor 1, and repeat the cycle; at this time, the temperature T _{in in} the server cabinet 15 continues to drop, As the temperature in the server cabinet 15 drops, the amount of the refrigerant liquid in the liquid storage tank 4 used for the evaporation of the server cabinet 15 decreases, and the amount stored in the liquid storage tank 4 decreases. so that the liquid level V _{in in} the liquid storage tank 4 keeps rising until the sensor 8 detects that the temperature T _in ≤ T _o in the server cabinet 15 and the liquid level V in the liquid storage tank 4 When _in satisfies the range V _l1 <V _in <V _l2 , go to step 30;

Step 30, enter the non-compressor refrigeration cycle mode, the sensor 8 gives a signal instruction to the controller 9, and the controller 9 closes the compressor 1, the first valve 10 and the third The valve 12 opens the second valve 11, and the low-temperature and low-pressure refrigerant liquid in the liquid storage tank 4 is throttled by the second throttle valve 5, and then enters the evaporator 6 to absorb heat and vaporize into a low-temperature and low-pressure refrigerant liquid. The refrigerant steam enters the air storage tank 7 and circulates repeatedly; at this time, the temperature T _{in in} the server cabinet 15 continues to rise, and as the temperature in the server cabinet 15 rises, the liquid storage tank 4 The more the amount of the refrigerant liquid in the refrigerant liquid used for the evaporation of the server cabinet 15 is, the less the amount stored in the liquid storage tank 4 is, so that the liquid level V _{in in} the liquid storage tank 4 is constantly When the sensor 8 detects that the temperature T _in ≤ T _o in the server cabinet 15 and the liquid level V _{in in} the liquid storage tank 4 satisfies the range 0<V _in ≤ V _l1 , enter step 40; Otherwise, go to step 20;

Step 40, enter the semi-compressor refrigeration cycle mode, the sensor 8 gives a signal instruction to the controller 9, and the controller 9 turns on the compressor 1, the first valve 10, the third Valve 12, the opening degree of the second valve 11 is reduced, the compressor 1 absorbs the low-temperature and low-pressure refrigerant vapor in the gas storage tank 7, compresses it into high-temperature and high-pressure refrigerant vapor, and passes through all the refrigerant vapors outside the machine room. After the condenser 2 dissipates heat and condenses into a high-temperature and high-pressure refrigerant liquid, it is throttled by the first throttle valve 3 to become a low-temperature and low-pressure refrigerant liquid, and then enters the liquid storage tank 4, and a part of the low-temperature and low-pressure refrigerant liquid After remaining in the liquid storage tank 4, another part of the low-temperature and low-pressure refrigerant liquid is throttled by the second throttle valve 5, and this part of the low-temperature and low-pressure refrigerant liquid enters the evaporator 6 to absorb heat and vaporize into a low-temperature The low-pressure refrigerant vapor enters the air storage tank 7, and the refrigerant vapor in the air storage tank 7 is sucked by the compressor 1 again, and the cycle is repeated; at this time, the temperature T _in the server cabinet 15 is As the temperature in the server cabinet 15 drops, the amount of the refrigerant liquid in the liquid storage tank 4 used for the evaporation of the server cabinet 15 is less, and the amount stored in the liquid storage tank 4 The more the amount inside, so that the liquid level V _{in in} the liquid storage tank 4 continues to rise, when the sensor 8 detects that the temperature T _in ≤ T _o in the server cabinet 15 and the liquid storage tank 4 When the internal liquid level V _in satisfies the range V _in =V _l2 , go to step 30; otherwise, go to step 20.

Further, the control mode of the first valve 10, the second valve 11 and the third valve 12 is electric or hydraulic transmission.

A control method of a direct expansion energy-saving air conditioner for a machine room of the present invention will be further described in detail below in conjunction with an embodiment.

Taking the energy-saving air conditioner in a computer room with a cooling capacity of 2000kW as a specific example, the refrigerant uses R134a.

The method needs to provide the above-mentioned direct expansion energy-saving air-conditioning system for a computer room, and the method specifically includes the following steps:

Step S1, setting the temperature boundary value T _o in the server cabinet 15 to 26°C; setting the boundary value V _l1 of the liquid level V _{in in} the liquid storage tank 4 to 0.2L and the threshold V _l2 to 0.9L (The maximum capacity of the liquid storage tank 4 is 0.9L); set three refrigeration cycle modes of the energy-saving air-conditioning system in the machine room, namely compressor refrigeration cycle mode, non-compressor refrigeration cycle mode and semi-compressor refrigeration cycle mode ;

Step S2, the sensor 8 continuously detects the temperature T _{in in} the server cabinet 15 and the liquid level V _{in in} the liquid storage tank 4, and when T _in >26°C, enters the compressor refrigeration cycle mode, The sensor 8 gives a signal instruction to the controller 9, and the controller 9 opens the compressor 1, the first valve 10, the second valve 11 and the third valve 12, and the compressor Machine 1 absorbs the low-temperature and low-pressure refrigerant vapor in the gas storage tank 7, compresses it into high-temperature and high-pressure refrigerant vapor, and condenses it into high-temperature and high-pressure refrigerant liquid through the condenser 2 outside the machine room. After the first throttling valve 3 throttles the low-temperature and low-pressure refrigerant liquid, it enters the liquid storage tank 4, and after being throttled by the second throttle valve 5, the low-temperature and low-pressure refrigerant liquid enters the evaporator 6 absorb heat and vaporize into low-temperature and low-pressure refrigerant vapor, enter the gas storage tank 7, be sucked by the compressor 1, and repeat the cycle; at this time, the temperature T _{in in} the server cabinet 15 continues to drop, As the temperature in the server cabinet 15 drops, the amount of the refrigerant liquid in the liquid storage tank 4 used for the evaporation of the server cabinet 15 decreases, and the amount stored in the liquid storage tank 4 decreases. so that the liquid level V _{in in} the liquid storage tank 4 continues to rise until the sensor 8 detects that the temperature T _{in in} the server cabinet 15 is ≤26°C and the liquid level V in the liquid storage tank 4 When _in satisfies the range of 0.2L<V _in <0.9L, enter step S3;

Step S3, enter the non-compressor refrigeration cycle mode, the sensor 8 gives a signal instruction to the controller 9, and the controller 9 closes the compressor 1, the first valve 10 and the third The valve 12 opens the second valve 11, and the low-temperature and low-pressure refrigerant liquid in the liquid storage tank 4 is throttled by the second throttle valve 5, and then enters the evaporator 6 to absorb heat and vaporize into a low-temperature and low-pressure refrigerant liquid. The refrigerant steam enters the air storage tank 7 and circulates repeatedly; at this time, the temperature T _{in in} the server cabinet 15 continues to rise, and as the temperature in the server cabinet 15 rises, the liquid storage tank 4 The more the amount of the refrigerant liquid in the refrigerant liquid used for the evaporation of the server cabinet 15 is, the less the amount stored in the liquid storage tank 4 is, so that the liquid level V _{in in} the liquid storage tank 4 is constantly When the sensor 8 detects that the temperature T _{in in} the server cabinet 15 is ≤26°C and the liquid level V _{in in} the liquid storage tank 4 satisfies the range 0<V _in ≤0.2L, enter step S4; Otherwise, go to step S2;

Step S4, enter the semi-compressor refrigeration cycle mode, the sensor 8 gives a signal instruction to the controller 9, and the controller 9 turns on the compressor 1, the first valve 10, the third Valve 12, reduce the opening degree of the second valve 11 (the degree of reduction is related to the temperature in the server cabinet 15, the lower the temperature, the smaller the adjustment, the tighter the second valve 11 is closed, so The more the amount of refrigerant liquid left in the liquid storage tank 4, the less the amount entering the evaporator 6; the higher the temperature, the greater the adjustment, the smaller the second valve 11 is closed, and the storage The less the amount of refrigerant liquid left in the liquid tank 4, the more the amount entering the evaporator 6), the compressor 1 absorbs the low-temperature and low-pressure refrigerant vapor in the gas storage tank 7, and compresses it into a high-temperature After the high-pressure refrigerant vapor is radiated and condensed into a high-temperature and high-pressure refrigerant liquid by the condenser 2 outside the machine room, it is throttled by the first throttle valve 3 to become a low-temperature and low-pressure refrigerant liquid, and then enters the storage tank. The liquid tank 4, wherein part of the low-temperature and low-pressure refrigerant liquid remains in the liquid storage tank 4, and the other part of the low-temperature and low-pressure refrigerant liquid is throttled by the second throttle valve 5, and this part of the low-temperature and low-pressure refrigerant liquid The liquid enters the evaporator 6 to absorb heat and vaporize into low-temperature and low-pressure refrigerant vapor, then enters the gas storage tank 7, and the refrigerant vapor in the gas storage tank 7 is sucked by the compressor 1 again, and the cycle is repeated; At this time, the temperature T _{in in} the server cabinet 15 keeps dropping, and as the temperature in the server cabinet 15 drops, the amount of the refrigerant liquid in the liquid storage tank 4 used for the evaporation of the server cabinet 15 will be The less, the more the amount stored in the liquid storage tank 4, so that the liquid level Vin _in the liquid storage tank 4 continues to rise, when the sensor 8 detects the temperature in the server cabinet 15 When T _in ≤ T _o and the liquid level V _{in in} the liquid storage tank 4 satisfies the range V _in =V _l2 , go to step S3; otherwise, go to step S2.

Further, the control mode of the first valve 10, the second valve 11 and the third valve 12 is electric or hydraulic transmission.

The compressor refrigerating cycle mode, the non-compressor refrigerating cycle mode and the semi-compressor refrigerating cycle mode are direct-expansion liquid supply cooling, and the high-pressure liquid directly supplies liquid cooling to the evaporator 6, absorbs heat and vaporizes Afterwards, it is directly inhaled by the compressor 1, thereby reducing the temperature in the server cabinet 15, and passing the cold air in the server cabinet 15 into the machine room, thereby generating a cooling effect in the machine room.

Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments we have described are only illustrative, rather than used to limit the scope of the present invention. Equivalent modifications and changes made by skilled personnel in accordance with the spirit of the present invention shall fall within the protection scope of the claims of the present invention.

Claims (4)

1. A direct expansion energy-saving air-conditioning system for a computer room, characterized in that: the energy-saving air-conditioning system for a computer room includes a compressor, a first throttle valve, a liquid storage tank, a second throttle valve, an evaporator, A gas storage tank, a sensor, a controller, a first valve, a second valve, a third valve, a temperature sensing probe, a liquid level sensing device, and a condenser arranged outside the machine room, and the evaporator is arranged in a corresponding server cabinet; The inlet pipe of the compressor is connected to one end of the third valve, the exhaust pipe of the compressor is connected to the inlet of the condenser; one end of the first throttle valve is connected to the outlet of the condenser connected, the other end of the first throttle valve is connected to one end of the first valve; the inlet of the liquid storage tank is connected to the other end of the first valve, and the outlet of the liquid storage tank is connected to the One end of the second valve is connected; one end of the second throttle valve is connected with the other end of the second valve, and the other end of the second throttle valve is connected with the inlet of the evaporator; the outlet of the evaporator connected to the inlet of the gas storage tank; the outlet of the gas storage tank is connected to the other end of the third valve; the temperature sensing probe is set in the server cabinet, and the liquid level sensing device is set in the The liquid storage tank, and the temperature probe and the liquid level sensing device are connected to the sensor; the controller is connected with the compressor, the first valve, the second valve, the The third valve is connected to the sensor. 2. A direct expansion energy-saving air-conditioning system for computer rooms according to claim 1, wherein the first valve, the second valve and the third valve are all electromagnetic valves. 3. A control method for a direct expansion energy-saving air conditioner in a computer room, the method needs to provide a direct expansion energy-saving air-conditioning system for a computer room as claimed in claim 1, wherein the method specifically includes the following steps: Step 10. Set the boundary value T _o of the temperature T _{in in} the server cabinet; set the boundary value V _l1 and threshold V _l2 of the liquid level V _{in in} the liquid storage tank; set the energy-saving air-conditioning system in the computer room There are three refrigeration cycle modes, namely compressor refrigeration cycle mode, non-compressor refrigeration cycle mode and semi-compressor refrigeration cycle mode; Step 20, the sensor continuously detects the temperature T _{in in} the server cabinet and the liquid level V _{in in} the liquid storage tank, and when T _in >T _o , enters the refrigeration cycle mode of the compressor, and the sensor Give the controller a signal command, the controller opens the compressor, the first valve, the second valve and the third valve, and the compressor absorbs the low temperature in the gas storage tank After the low-pressure refrigerant vapor is compressed into high-temperature and high-pressure refrigerant vapor, it is cooled and condensed into high-temperature and high-pressure refrigerant liquid by the condenser outside the machine room, and then throttled by the first throttle valve into low-temperature and low-pressure refrigerant After the liquid enters the liquid storage tank, after being throttled by the second throttle valve, the low-temperature and low-pressure refrigerant liquid enters the evaporator to absorb heat and vaporize into low-temperature and low-pressure refrigerant vapor, and then enters the gas storage tank, is sucked by the compressor again, and circulates repeatedly; at this time, the temperature T _{in in} the server cabinet keeps dropping, and as the temperature in the server cabinet drops, the refrigerant liquid in the liquid storage tank The less the amount used for the evaporation of the server cabinet, the more the amount stored in the liquid storage tank, so that the liquid level V _{in in} the liquid storage tank continues to rise until the sensor detects the When the temperature T _{in in} the server cabinet ≤ T _o and the liquid level V _{in in} the liquid storage tank satisfies the range V _l1 <V _in <V _l2 , enter step 30; Step 30, enter the non-compressor refrigeration cycle mode, the sensor sends a signal instruction to the controller, the controller closes the compressor, the first valve and the third valve, and opens the The second valve, after the low-temperature and low-pressure refrigerant liquid in the liquid storage tank is throttled by the second throttle valve, it enters the evaporator to absorb heat and vaporize into low-temperature and low-pressure refrigerant vapor, and then enters the gas storage tank. Tank, repeated circulation; at this time, the temperature T _{in in} the server cabinet is constantly rising, and as the temperature in the server cabinet rises, the refrigerant liquid in the liquid storage tank that is used for the evaporation of the server cabinet The greater the amount, the less the amount stored in the liquid storage tank, so that the liquid level V _{in in} the liquid storage tank continues to drop, when the sensor detects the temperature T _in the server cabinet ≤T _o and the liquid level V _{in in} the liquid storage tank satisfies the range 0<V _in ≤V _l1 , go to step 40; otherwise, go to step 20; Step 40, enter the semi-compressor refrigeration cycle mode, the sensor sends a signal command to the controller, the controller turns on the compressor, the first valve, and the third valve, and turns down the The second valve opening, the compressor absorbs the low-temperature and low-pressure refrigerant vapor in the gas storage tank, compresses it into high-temperature and high-pressure refrigerant vapor, and condenses it into high-temperature and high-pressure refrigeration through the condenser outside the machine room. After being throttled by the first throttling valve, it becomes a low-temperature and low-pressure refrigerant liquid, and then enters the liquid storage tank. Part of the low-temperature and low-pressure refrigerant liquid stays in the liquid storage tank, and the other part of the low-temperature and low-pressure refrigerant liquid stays in the liquid storage tank. After the refrigerant liquid is throttled by the second throttle valve, this part of the low-temperature and low-pressure refrigerant liquid enters the evaporator to absorb heat and vaporize into low-temperature and low-pressure refrigerant vapor, and then enters the gas storage tank. The refrigerant vapor in the air storage tank is inhaled by the compressor again, and circulates repeatedly; at this time, the temperature T _{in in} the server cabinet keeps dropping, and as the temperature in the server cabinet drops, the liquid storage tank The less the amount of the refrigerant liquid in the refrigerant liquid used for evaporation of the server cabinet, the more the amount stored in the liquid storage tank, so that the liquid level V _{in in} the liquid storage tank continues to rise, when When the sensor detects that the temperature T _in ≤ T _o in the server cabinet and the liquid level V _{in in} the liquid storage tank satisfies the range V _in =V _l2 , enter step 30; otherwise, enter step 20. 4. The control method of a direct expansion energy-saving air conditioner for a computer room according to claim 3, characterized in that: the control mode of the first valve, the second valve and the third valve is electric or hydraulic transmission .