CN103344016A - Energy-saving air conditioner for machine room - Google Patents

Abstract

The invention provides an energy-saving air conditioner for a machine room, which comprises an evaporator arranged in the machine room, a first condenser, a second condenser, a compressor and an intermediate heat exchanger arranged outside the machine room. According to the temperature difference inside and outside the machine room, the energy-saving air conditioner for the machine room of the present invention can flexibly select three operating modes: "heat pipe heat exchange cycle mode", "compressor refrigeration cycle mode", or "heat pipe heat exchange cycle and compressor cooling at the same time". During the process, there is no action of any mechanical valve, which can effectively solve the problem of heat dissipation in the computer room, and has low energy consumption, high reliability and long service life.

Description

A machine room energy-saving air conditioner

technical field

The invention relates to the field of energy-saving air conditioners for computer rooms, in particular to an energy-saving air conditioner for computer rooms.

Background technique

Due to the high heat generated by the equipment in the computer room, special air-conditioning equipment is required to maintain the temperature in the computer room. At present, the existing computer room generally adopts the continuous operation of the comfort air conditioner to regulate the indoor temperature. Although this temperature control method can meet the temperature control requirements of the computer room, it consumes a lot of energy, resulting in high operating costs.

At present, there are two main energy-saving technologies for computer room air conditioners:

One is to introduce outdoor fresh air to cool the equipment in the equipment room during the transitional season or when the outdoor temperature is relatively cool in winter. This kind of equipment can directly use the outdoor natural cold source, but it is difficult to meet the air cleanliness and humidity control requirements in the computer room, and it will cause great damage to the maintenance structure of the computer room. When the fresh air system stops working, there is a hidden danger of air leakage, which will lead to the loss of indoor cooling capacity when the weather is relatively hot. Filters need to be installed at the air inlet and outlet of the fresh air system, and the filters not only increase the wind resistance of the system, but also need to be replaced frequently, requiring a lot of maintenance.

The other is to use a plate air heat exchanger to introduce the coldness of the outdoor air into the room during the transition season or when the outdoor temperature is relatively cool in winter. This technology realizes the isolation of indoor and outdoor air, and avoids the problems of air cleanliness and humidity control caused by direct introduction of outdoor air. However, due to the small heat transfer per unit area and large volume, it is necessary to open an air duct to connect with the heat exchanger, which will cause great damage to the wall. Since the heat exchanger adopts a honeycomb structure, the air flow channel is easily blocked by dust, so filters need to be installed at the inlet and outlet of the outdoor air flow channel, and the maintenance is relatively large.

Contents of the invention

Aiming at the shortcomings and deficiencies of the prior art, the present invention provides an energy-saving air conditioner for a computer room, which can flexibly select "heat pipe heat exchange cycle mode", "compressor refrigeration cycle mode" or "heat pipe heat exchange cycle mode" according to the temperature difference inside and outside the machine room. Mode and Compression Refrigeration Cycle Simultaneous Refrigeration Cycle Mode" three operating modes. During the selection process of the operating mode, there is no action of any mechanical valve, which can effectively solve the problem of heat dissipation in the machine room, and it has low energy consumption, high reliability and long service life. long.

The technical solution adopted by the present invention to solve its technical problems is:

An energy-saving air conditioner for a machine room, characterized in that it includes an evaporator, a first condenser, a second condenser, a compressor, a throttling component, and an intermediate heat exchanger, and the evaporator is placed in the machine room;

The intermediate heat exchanger is a partitioned wall heat exchanger with a first inlet, a first outlet, a second inlet, and a second outlet;

The outlet of the evaporator communicates with the inlet of the tee I through a connecting pipe, and the first outlet and the second outlet of the tee I communicate with the first inlet of the intermediate heat exchanger and the inlet of the first condenser respectively;

The inlet of the evaporator communicates with the outlet of the tee II through a connecting pipe, and the first inlet and the second inlet of the tee II communicate with the outlet of the first condenser and the first outlet of the intermediate heat exchanger respectively;

The second outlet of the intermediate heat exchanger communicates with the suction port of the compressor through a connecting pipe;

The exhaust port of the compressor communicates with the inlet of the second condenser through a connecting pipe;

The outlet of the second condenser communicates with the inlet of the throttling component through a connecting pipe;

The outlet of the throttling component communicates with the second inlet of the intermediate heat exchanger through a connecting pipe;

The position of the first condenser is higher than that of the evaporator;

The position of the intermediate heat exchanger is higher than that of the evaporator.

Preferably, both the evaporator and the first and second condensers have fans.

Preferably, the outlet of the evaporator is arranged at its upper part, and its inlet is arranged at its bottom.

Preferably, the inlet of the first condenser is arranged at its upper part, and its inlet is arranged at its bottom.

Preferably, it further includes a sensor for measuring the temperature inside and outside the machine room, and a controller for controlling the operation of the air conditioner, and the controller controls the operation mode of the air conditioner according to the temperature information measured by the sensor.

Preferably, after the equipment is started, the fan of the evaporator runs normally, and when the temperature in the machine room - the outdoor temperature of the machine room > the first preset value, and the indoor temperature is further greater than or equal to the preset value of the air conditioner temperature control, the controller controls the priority to start the The first condenser fan is described, and the second condenser fan and compressor are turned off. At this time, the air conditioner operates in the heat pipe heat exchange cycle mode.

Further, when the indoor temperature of the machine room - the outdoor of the machine room < the first preset value, and the indoor temperature is further greater than or equal to the sum of the air conditioner temperature control preset value and the delayed start temperature of the compressor, the controller controls to start the second condenser fan and the compressor, the first condenser fan is turned off, and the air conditioner operates in the compression refrigeration cycle mode at this time.

Further, when the indoor temperature of the machine room - the outdoor temperature of the machine room>the first preset value, and the temperature in the machine room exceeds the sum of the temperature control preset value of the air conditioner and the delayed start temperature of the compressor, the controller controls to start the evaporator The fan and the first and second condenser fans and compressors. At this time, the air conditioner operates in the cooling mode of the heat pipe heat exchange cycle mode and the compression refrigeration cycle at the same time.

Further, the delayed start temperature of the compressor is adjustable from 0°C to 5°C, and the preset temperature control value of the air conditioner is 23°C.

Further, the first preset value is 3°C.

Preferably, the intermediate heat exchanger is a sleeve-and-tube heat exchanger, a plate heat exchanger, or a shell-and-tube heat exchanger.

Preferably, the refrigerant of the air conditioner is any one of R22, R134a or R410A.

From the above technical solutions, it can be known that the energy-saving air conditioner for computer rooms of the present invention has two heat exchange modes: heat pipe cycle heat exchange and compression refrigeration cycle heat exchange. The heat pipe heat exchange cycle is completely isolated from the refrigerant in the compression refrigeration cycle, and only two intermediate exchanges The heat exchanger performs heat exchange without mixing, which can effectively solve the problem of difficult flow adjustment caused by the two cycles sharing refrigerant and the problem that the refrigeration oil reduces the heat pipe cycle efficiency. This technical solution flexibly selects the "heat pipe cycle Mode operation", "compressor refrigeration cycle mode operation", "or heat pipe circulation mode and compressor refrigeration cycle mode simultaneous operation", there is no mechanical action of any valve during the operation mode switching process, which can effectively solve the heat discharge problem of the machine room, And low energy consumption, high reliability, long service life.

Description of drawings

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

Fig. 2 is a schematic diagram of the working fluid cycle of the energy-saving air conditioner for a computer room in the "heat pipe heat exchange cycle mode" of the present invention.

Fig. 3 is a schematic diagram of the working fluid cycle of the energy-saving air conditioner for a computer room in the "compression refrigeration cycle mode" of the present invention.

Fig. 4 is a schematic diagram of the working medium cycle when the energy-saving air conditioner for a computer room of the present invention is in "simultaneous operation of the heat pipe cycle mode and the compression refrigeration cycle mode".

Detailed ways

The invention provides an energy-saving air conditioner for a machine room, which has low energy consumption, high reliability and long service life.

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

Fig. 1 is a structural schematic diagram of an energy-saving air conditioner for a computer room according to the present invention. As shown in Figure 1, the energy-saving air conditioner for a machine room of the present invention includes an evaporator 1 arranged in the machine room 19, a first condenser 12 and a second condenser 13 arranged outside the machine room 19, and a compressor 9 and a tee 5 And 17, intermediate heat exchanger 4 and throttling part 8.

Wherein, the tee 5 includes an inlet, a first outlet and a second outlet, and the tee 17 includes a first inlet, a second inlet and an outlet.

The outlet of the evaporator 1 communicates with the inlet of the tee 5 through the connecting pipe 2 ; the inlet of the first condenser 12 communicates with the first outlet of the tee 5 through the connecting pipe 10 .

The inlet of the evaporator 1 communicates with the outlet of the tee 17 through the connecting pipe 18 ; the outlet of the first condenser 12 communicates with the first inlet of the tee 17 through the connecting pipe 14 .

The first inlet of the intermediate heat exchanger 4 communicates with the second outlet of the tee 5 through a connecting pipe 6 .

The first outlet of the intermediate heat exchanger 4 communicates with the second inlet of the tee 17 through the connecting pipe 16 .

The second outlet of the intermediate heat exchanger 4 communicates with the suction port of the compressor 9 through the connecting pipe 7 .

The second inlet of the intermediate heat exchanger 4 communicates with the low-pressure end of the throttling component 8 through the connecting pipe 3 .

The exhaust port of the compressor 9 communicates with the inlet of the second condenser 13 through a connecting pipe 11 .

The outlet of the second condenser 13 communicates with the high-pressure end of the throttling component 8 through the drill pipe 15 .

Wherein, the overall position of the first condenser 12 should be higher than the evaporator 1 . The overall position of the intermediate heat exchanger 4 should be higher than that of the evaporator 1. Therefore, it is ensured that the liquid refrigerant condensed in the first condenser 12 or the intermediate heat exchanger 4 can return to the evaporator 1 under the action of gravity without adding a driving device such as a circulation pump.

Preferably, the evaporator 1 and the first condenser 12 and the second condenser 13 all have fans. Wherein the first condenser 12 and the second condenser 13 can use the same fan.

Preferably, the energy-saving air conditioner for a computer room of the present invention further includes a sensor (not shown) for measuring the temperature inside and outside the computer room and a controller (not shown) for controlling the operation of the air conditioner according to the signal from the sensor.

After the energy-saving air conditioner is started, the evaporator fan runs normally, when the temperature outside the machine room 19 is lower than the temperature inside the machine room 19, and the temperature difference is greater than a certain preset value, and the indoor temperature of the machine room 19 is further greater than the preset value of the air conditioner temperature control When, for example, the temperature control preset value of the air conditioner is 23°C, the temperature outside the machine room 19 is lower than the temperature inside the machine room 19 by more than 3°C, and when the indoor temperature of the machine room 19 is greater than 23°C, the controller can start the first condenser 12 fans. The air conditioner adopts the cycle mode of heat pipe heat exchange.

That is, in the circulation mode of heat pipe heat exchange as shown in FIG. 2 , the evaporator 1 inside the machine room 19 and the first condenser 12 outside the machine room 19 form a separate heat pipe system. The inside of the machine room 19 is the heat absorbing end of the heat pipe, and the outside of the machine room 19 is the heat exhausting end of the heat pipe. The upper part of the evaporator 1 communicates with the upper part of the first condenser 12 through the connecting pipe 2, the tee 5 and the connecting pipe 10. Both the evaporator 1 and the first condenser 12 are equipped with fans, and the heat exchange of heat pipes is adopted to make the machine room The heat in the 19 is discharged to the outside of the machine room 19.

When using heat pipe heat exchange cycle mode, the compression refrigeration system is closed. The fan of the evaporator 1 starts, and the hot air in the machine room 19 flows through the evaporator 1 to heat the refrigerant in the evaporator 1. When the temperature exceeds the boiling point of the working medium, the working medium in the evaporator 1 boils, and at the same time, the air is cooled. The gaseous refrigerant generated by boiling in the evaporator 1, the gaseous refrigerant flows in the direction of arrow A as shown in Figure 2, and flows into the first condenser 12 through the connecting pipe 2, the tee 5, and the connecting pipe 10, and the first condenser 12 has The fan is in the form of forced convection. The gaseous refrigerant in the first condenser 12 is cooled by the air flowing through the first condenser 12 and condensed into a liquid state. The liquid refrigerant is shown in the direction of arrow A in Figure 2. Under the action of gravity, the liquid refrigerant The refrigerant flows back into the evaporator 1 from the connecting pipe 14, the tee 17 and the connecting pipe 18 at the bottom of the first condenser 12 to complete the cycle.

That is, when the circulation mode of heat pipe heat exchange is adopted, the heat pipe heat exchange is composed of evaporator 1, connecting pipe 2, tee 5, connecting pipe 10, first condenser 12, connecting pipe 14, tee 17, and connecting pipe 18. circulation path.

When the temperature difference between the temperature outside the machine room 19 and the temperature inside the machine room 19 is less than the preset value, and the temperature inside the machine room 19 exceeds the sum of the preset value of the air conditioner temperature control and the delayed start temperature of the air conditioner compressor, the air conditioner starts the compression refrigeration cycle mode. The controller starts the fan of the second condenser 13, the compressor 9, and the throttling part 8.

In the cycle mode of compression refrigeration shown in Figure 3, when the compression refrigeration cycle is running, the refrigerant cycle between the evaporator 1 and the intermediate heat exchanger 4 is shown in the direction of arrow B in Figure 3, and the refrigerant in the evaporator 1 It is heated and evaporated by the indoor air, becomes steam, and flows to the first inlet of the intermediate heat exchanger 4 through the connecting pipe 2, the tee 5, and the connecting pipe 6, and is condensed into liquid in the intermediate heat exchanger 4, and the heat is exchanged from the intermediate The first outlet of device 4 flows out and flows back to evaporator 1. The heat released by the condensation of the refrigerant flowing from the evaporator 1 into the intermediate heat exchanger 4 in the 4 intermediate heat exchanger 4 is transferred to the refrigerant in the compression refrigeration cycle, so that the refrigerant in the compression refrigeration cycle evaporates into steam , the refrigerant flow direction in the compression refrigeration cycle is shown in the arrow C direction in Figure 3, the refrigerant vapor flows out from the second outlet of the intermediate heat exchanger 4, and is sucked into the compressor 9 through the connecting pipe 7 for compression. The refrigerant coming out of the compressor 9 becomes superheated steam, and the superheated steam flows into the second condenser 13 through the connecting pipe 11 for condensation, and the condensed refrigerant flows to the throttling part 8 through the connecting pipe 15, and the throttling refrigerant The vapor-liquid mixture, which becomes a low temperature and low pressure, flows back to the intermediate heat exchanger 4 from the second inlet of the intermediate heat exchanger through the connecting pipe 3, and continues to evaporate and absorb heat.

When the temperature difference between the temperature outside the machine room 19 and the temperature inside the machine room 19 is greater than the preset value, and the temperature in the machine room 19 exceeds the sum of the air conditioner temperature control preset value and the compressor delay start temperature, for example, the air conditioner temperature control preset value is 23 ℃, the delayed start temperature of the compressor is 1 ℃, and when the temperature difference between the inside and outside of the machine room 19 is greater than 3 ℃, although the circulation mode of the heat pipe heat exchange can be enabled, the heat exchange cycle mode of the heat pipe cannot meet the heat removal demand of the machine room, and the indoor temperature rises to 23 When ℃+1℃, the air conditioner starts the mode of "simultaneous operation of heat pipe heat exchange cycle mode and compression refrigeration cycle". The controller starts the fan of the first condenser 12 , the fan of the second condenser 13 , the compressor 9 , and the throttling component 8 .

As shown in Figure 4, in the mode of "simultaneous operation of the heat pipe heat exchange cycle and the compression refrigeration cycle", the refrigerant cycle of the heat pipe heat exchange cycle is shown by the D arrow in Figure 4. The fan of the evaporator 1 starts, and the hot air in the machine room 19 flows through the evaporator 1 to heat the refrigerant in the evaporator 1. When the temperature exceeds the boiling point of the working medium, the working medium in the evaporator 1 boils, and at the same time, the air is cooled.

The gaseous refrigerant generated by boiling in the evaporator 1, the gaseous refrigerant flows in the direction of the arrow D as shown in Figure 4, after passing through the connecting pipe 2 and the tee 5:

Part of the gaseous refrigerant flows into the first condenser 12 from the connecting pipe 10 along the direction of D1. The first condenser 12 has a fan, which is in the form of forced convection. The gaseous refrigerant in the first condenser 12 is passed through the first condenser 12. The air is cooled and condensed into a liquid state. The liquid refrigerant is in the direction of the arrow D1 in Figure 4. Under the action of gravity, the liquid refrigerant flows back to the evaporator from the connecting pipe 14, the tee 17, and the connecting pipe 18 at the bottom of the first condenser 12. 1, complete the heat pipe heat exchange cycle;

The other part of the gaseous refrigerant flows into the first inlet of the intermediate heat exchanger 4 from the connecting pipe 6 along the direction of D2. In the intermediate heat exchanger 4, the working medium of the compressed refrigeration cycle is condensed into a liquid working medium. There is a second intermediate heat exchanger. One outlet flows out and flows back into the evaporator. The heat released by this part of the refrigerant is absorbed by the refrigerant of the compression refrigeration cycle in the intermediate heat exchanger 4, and the refrigerant cycle of the compression refrigeration cycle is shown as C in FIG. 4 .

Preferably, the intermediate heat exchanger 4 may be a sleeve-and-tube heat exchanger, a plate heat exchanger, or a shell-and-tube heat exchanger.

Preferably, the refrigerant of the air conditioner is any one of R22, R134a or R410A, and one of the refrigerants can be selected for single use, or mixed for use. The heat pipe heat exchange cycle mode is completely isolated from the refrigerant used in the compression refrigeration cycle mode, and only two intermediate heat exchangers are used for heat exchange without mixing, so it can effectively solve the flow adjustment caused by the two cycles sharing refrigerant difficult question.

From the above technical solutions, it can be seen that the energy-saving air conditioner for a computer room of the present invention has two heat exchange modes: heat pipe heat exchange and compression refrigeration cycle heat exchange. By flexibly selecting one of the heat exchange modes according to the temperature difference inside and outside the computer room, it can effectively solve the problem of the computer room. Heat dissipation problem, and low energy consumption, high reliability, long service life.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims (10)

1. An energy-saving air conditioner for a machine room, characterized in that it includes an evaporator, a first condenser, a second condenser, a compressor, a throttling component, and an intermediate heat exchanger, and the evaporator is placed in the machine room; The intermediate heat exchanger is a partitioned wall heat exchanger with a first inlet, a first outlet, a second inlet, and a second outlet; The outlet of the evaporator communicates with the inlet of the tee I through a connecting pipe, and the first outlet and the second outlet of the tee I communicate with the first inlet of the intermediate heat exchanger and the inlet of the first condenser respectively; The inlet of the evaporator communicates with the outlet of the tee II through a connecting pipe, and the first inlet and the second inlet of the tee II communicate with the outlet of the first condenser and the first outlet of the intermediate heat exchanger respectively; The second outlet of the intermediate heat exchanger communicates with the suction port of the compressor through a connecting pipe; The exhaust port of the compressor communicates with the inlet of the second condenser through a connecting pipe; The outlet of the second condenser communicates with the inlet of the throttling component through a connecting pipe; The outlet of the throttling component communicates with the second inlet of the intermediate heat exchanger through a connecting pipe; The position of the first condenser is higher than that of the evaporator; The position of the intermediate heat exchanger is higher than that of the evaporator. 2. The energy-saving air conditioner for a computer room according to claim 1, wherein the evaporator and the first and second condensers both have fans. 3. The energy-saving air conditioner for a computer room according to claim 1, wherein the outlet of the evaporator is arranged at its upper part, and its inlet is arranged at its bottom. 4. The energy-saving air conditioner for a computer room according to claim 1, wherein the inlet of the first condenser is arranged at its upper part, and its inlet is arranged at its bottom. 5. The energy-saving air conditioner for a computer room according to any one of claims 1 to 4, characterized in that it further comprises a sensor for measuring the temperature inside and outside the computer room, and a controller for controlling the operation of the air conditioner, and the controller is based on the temperature measured by the sensor. The obtained temperature information controls the operation mode of the air conditioner. 6. The energy-saving air conditioner for a computer room according to claim 5, characterized in that, after the equipment is started, the evaporator fan runs continuously, the temperature in the computer room - the outdoor temperature of the computer room > the first preset value, and the indoor temperature is further greater than or equal to the temperature of the air conditioner. When the preset value is controlled, the controller controls to preferentially start the first condenser fan and turn off the second condenser fan and compressor. At this time, the air conditioner operates in the heat pipe heat exchange cycle mode. 7. The energy-saving air conditioner for a computer room according to claim 6, characterized in that when the indoor temperature of the computer room - the outdoor of the computer room < the first preset value, and the indoor temperature is further greater than or equal to the difference between the preset temperature control value of the air conditioner and the delayed start temperature of the compressor At the same time, the controller controls to start the second condenser fan and the compressor, and turns off the first condenser fan. At this time, the air conditioner operates in the compression refrigeration cycle mode. 8. The energy-saving air conditioner for a computer room according to claim 7, wherein the indoor temperature of the computer room - the outdoor temperature of the computer room > the first preset value, and the temperature in the computer room exceeds the temperature control preset value of the air conditioner and the delayed start temperature of the compressor When summed, the controller controls to start the evaporator fan and the first and second condenser fans and compressors, and the air conditioner operates in the heat pipe heat exchange cycle mode and the compression refrigeration cycle cooling mode at the same time. 9. The energy-saving air conditioner for a computer room according to claim 8, wherein the delayed start temperature of the compressor is adjustable from 0 to 5°C, and the preset temperature control value of the air conditioner is 23°C. 10. The energy-saving air conditioner for a computer room according to any one of claims 6 to 9, wherein the first preset value is 3°C.

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