Efficient and energy-saving indirect heat exchange unit with air-air heat exchanger

Abstract

The invention discloses an efficient and energy-saving indirect heat exchange unit with an air-air heat exchanger, and relates to the technical field of heat exchange units. The air-to-air heat exchanger comprises an air-to-air heat exchanger body, a water replenishing device and a condenser, the water replenishing device is connected with a water storage tank, the water storage tank is connected with an evaporator cold water pump and an evaporation cold drainage device, and the evaporator cold water pump is connected with an evaporation cold spraying device; the condenser is connected with a fluorine system throttle valve, the fluorine system throttle valve is connected with an evaporator, the evaporator is connected with a fluorine system compressor, and a branch pipe is connected between the fluorine system compressor and the condenser. The indoor bypass electric air valve is additionally arranged on the indirect evaporation cooling unit, under the conditions that the outdoor temperature is low and the rotating speed of the outdoor draught fan is not high, the indoor bypass electric air valve is opened, indoor return air is partially bypassed, the rotating speed of the outdoor draught fan is increased, the power of the indoor draught fan is reduced, the indoor draught fan and the outdoor draught fan operate in a balanced mode, and the operation efficiency of the draught fans is improved; and the annual operation energy efficiency of the whole machine is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat exchange units, and in particular relates to a high-efficiency and energy-saving indirect heat exchange unit with an air-to-air heat exchanger. Background Art

[0002] With the rapid development of data centers, the power density of servers is increasing, and the energy consumption requirements for data centers are also increasing. The refrigeration system accounts for about 40% of the energy consumption of the entire data center. It is urgent to reduce the energy consumption of the refrigeration system of the data center. Indirect evaporative cooling is currently used by most data centers due to its high efficiency and energy saving, integration of internal and external units, and rapid shortening of construction period. The indirect evaporative cooling equipment in the existing technology saves energy in the design of fluorine system, air-to-air heat exchanger design, and device selection, and reduces power consumption and energy saving design from energy-consuming devices such as compressors, water pumps, and outdoor fans, but it cannot be balanced in terms of cost and performance. Summary of the invention

[0003] Based on the above deficiencies in the prior art, the technical problem solved by the present invention is to provide an efficient and energy-saving indirect heat exchanger unit with an air-to-air heat exchanger, which partially bypasses the indoor return air, increases the speed of the outdoor fan, reduces the power of the indoor fan, makes the indoor and outdoor fans run in a balanced manner, improves the operating efficiency of the fan, and improves the energy efficiency of the whole machine throughout the year.

[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention provides an efficient and energy-saving indirect heat exchange unit with an air-to-air heat exchanger, comprising: an air-to-air heat exchanger body, a water replenishing device and a condenser; the water replenishing device is connected to a water storage tank, the water storage tank is connected to an evaporator cold water pump and an evaporative cold drainage device, and the evaporator cold water pump is connected to an evaporative cold spray device; the condenser is connected to a fluorine system throttle valve, the fluorine system throttle valve is connected to an evaporator, the evaporator is connected to a fluorine system compressor, and a branch pipe is connected between the fluorine system compressor and the condenser; a blower is provided on one side of the branch pipe, and a condensing fan is provided on one side of the condenser; indoor bypass electric air valves are provided on both sides of the air-to-air heat exchanger body.

[0005] Optionally, the water storage tank, evaporator and evaporative cooling spray device are arranged on the peripheral side of the air-to-air heat exchanger body.

[0006] Optionally, the water storage tank and the evaporative cooling spray device are arranged on opposite sides of the air-to-air heat exchanger body, and the evaporator is arranged on one side of the air-to-air heat exchanger body.

[0007] Optionally, the blower runs and generates indoor supply air on one side, and indoor return air is provided on one side of the air-to-air heat exchanger body.

[0008] Optionally, an outdoor air inlet is provided on a side of the air-to-air heat exchanger body close to the water tank.

[0009] Optionally, mixed air generated by mixing indoor return air and outdoor intake air is provided between the indoor bypass electric air valve and the evaporator.

[0010] The indoor bypass electric air valve of the present invention is provided with a control system, and the specific control method includes the following stages:

[0011] The first stage: detect the outdoor ambient temperature and the outdoor fan speed, and make a judgment. If the outdoor ambient temperature and the outdoor fan speed are less than the preset first threshold, it is determined that the operation state is uneconomical, and the outdoor fan speed is increased and the indoor fan speed is reduced to balance the indoor and outdoor fan power and improve energy efficiency, and open the indoor bypass electric air valve;

[0012] The second stage: after the indoor bypass electric air valve is opened, the indoor supply air temperature is detected and judged. If the indoor supply air temperature is lower than the preset second threshold, it is determined that the natural cooling provided by the outdoor fan is large. By bypassing part of the indoor return air, the resistance of the air-to-air heat exchanger is reduced, and the power of the indoor supply fan is reduced;

[0013] The third stage: detect the indoor air supply temperature and make a judgment. If the indoor air supply temperature is equal to the preset third threshold, maintain the current operating state.

[0014] Optionally, in the first stage, if the outdoor ambient temperature and the outdoor fan speed are greater than a preset first threshold, the closed state is maintained.

[0015] Optionally, in the second stage, if the indoor supply air temperature is greater than and / or equal to a preset second threshold value, the opening of the indoor bypass electric air valve is closed.

[0016] Optionally, in the third stage, if the indoor supply air temperature is not equal to a preset third threshold value, the second stage is re-entered.

[0017] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0018] The present invention adds an indoor bypass electric air valve to the indirect evaporative cooling unit. Under the conditions of low outdoor temperature and low outdoor fan speed, the indoor bypass electric air valve is opened to partially bypass the indoor return air, thereby increasing the outdoor fan speed and reducing the indoor fan power, so that the indoor and outdoor fans can operate in a balanced manner, thereby improving the operating efficiency of the fan and the energy efficiency of the entire machine throughout the year.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following is a detailed description in combination with the preferred embodiments and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0021] Figure 1 It is a structural schematic diagram of an air-to-air heat exchanger indirect heat exchange unit;

[0022] Figure 2 It is a top view structural schematic diagram of an air-to-air heat exchanger indirect heat exchange unit;

[0023] Figure 3 Schematic diagram of the control system.

[0024] Among them, 1-fluorine system throttle valve, 2-condensing fan, 3-condenser, 4-evaporative cooling spray device, 5-evaporative cooling water pump, 6-evaporative cooling drainage device, 7-water storage tank, 8-water replenishment device, 9-fluorine system compressor, 10-evaporator, 11-air supply fan, 12-air-to-air heat exchanger body, 13-indoor return air, 14-indoor supply air, 15-outdoor air intake, 16-indoor bypass electric air valve, 17-mixed air. DETAILED DESCRIPTION

[0025] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings, which is a part of this specification and illustrates the principles of the present invention through examples. Other aspects, features and advantages of the present invention will become clear from the detailed description. In the referenced drawings, the same or similar components in different figures are represented by the same reference numerals.

[0026] Refer to the following Figures 1 to 3 The specific structure of the high-efficiency and energy-saving indirect heat exchange unit with air-to-air heat exchanger of the present invention is described.

[0027] like Figures 1 to 3 As shown, the high-efficiency and energy-saving indirect heat exchange unit with an air-to-air heat exchanger of the present invention comprises: an air-to-air heat exchanger body 12 , a water replenishing device 8 and a condenser 3 .

[0028] The water replenishment device 8 is connected to a water storage tank 7 , the water storage tank 7 is connected to an evaporator cold water pump 5 and an evaporative cold water drainage device 6 , and the evaporator cold water pump 5 is connected to an evaporative cold spray device 4 .

[0029] The condenser 3 is connected to a fluorine system throttle valve 1, the fluorine system throttle valve 1 is connected to an evaporator 10, the evaporator 10 is connected to a fluorine system compressor 9, and a branch pipe is connected between the fluorine system compressor 9 and the condenser 3. A blower 11 is provided on one side of the branch pipe, and a condensing blower 2 is provided on one side of the condenser 3; indoor bypass electric air valves 16 are provided on both sides of the air-to-air heat exchanger body 12.

[0030] like Figure 1-2As shown, the water storage tank 7 , the evaporator 10 and the evaporative cooling spray device 4 of this embodiment are arranged on the peripheral side of the air-to-air heat exchanger body 12 .

[0031] like Figure 1-2 As shown, the water storage tank 7 and the evaporative cooling spray device 4 of this embodiment are arranged on opposite sides of the air-to-air heat exchanger body 12 , and the evaporator 10 is arranged on one side of the air-to-air heat exchanger body 12 .

[0032] like Figure 1-2 As shown, the blower 11 of this embodiment is running and generates indoor supply air 14 on one side, and indoor return air 13 is provided on one side of the air-to-air heat exchanger body 12.

[0033] like Figure 1-2 As shown, the air-to-air heat exchanger body 12 of this embodiment is provided with an outdoor air inlet 15 on the side close to the water storage tank 7 .

[0034] like Figure 1-2 As shown, in this embodiment, a mixed air 17 generated by mixing the indoor return air 13 and the outdoor intake air 15 is provided between the indoor bypass electric air valve 16 and the evaporator 10 .

[0035] like Figure 3 As shown, the indoor bypass electric air valve 16 of this embodiment is provided with a control system, and the specific control method includes the following stages:

[0036] The first stage: detect the outdoor ambient temperature and the outdoor fan speed, and make a judgment. If the outdoor ambient temperature and the outdoor fan speed are less than the preset first threshold, it is determined that the operation state is uneconomical, increase the outdoor fan, and reduce the indoor fan speed to balance the indoor and outdoor fan power to improve energy efficiency, and open the indoor bypass electric air valve 16; wherein, if the outdoor ambient temperature and the outdoor fan speed are greater than the preset first threshold, the closed state is maintained, and the first threshold includes 100% natural cooling temperature set to 16°C, and the outdoor fan speed is 50%;

[0037] The second stage: after the indoor bypass electric air valve 16 is opened, the temperature of the indoor supply air 14 is detected and judged. If the temperature of the indoor supply air 14 is less than the preset second threshold, it is determined that the natural cooling provided by the outdoor fan is large, and the resistance of the air-to-air heat exchanger body 12 is reduced by bypassing part of the indoor return air 13, thereby reducing the power of the indoor supply fan 11; wherein, if the temperature of the indoor supply air 14 is greater than and / or equal to the preset second threshold, the opening of the indoor bypass electric air valve 16 is closed, and the second threshold includes the indoor supply air temperature setting temperature of 24°C-3°C;

[0038] The third stage: detect the temperature of the indoor supply air 14 and make a judgment. If the temperature of the indoor supply air 14 is equal to the preset third threshold, maintain the current operating state; wherein, if the temperature of the indoor supply air 14 is not equal to the preset third threshold, re-enter the second stage, and the third threshold includes the indoor supply air temperature setting temperature of 24℃±1℃.

[0039] The present invention adds an indoor bypass electric air valve 16 to the indirect evaporative cooling unit. Under the conditions of low outdoor temperature and low outdoor fan speed, the indoor bypass electric air valve 16 is opened to partially bypass the indoor return air 13, thereby increasing the outdoor fan speed and reducing the indoor fan power, so that the indoor and outdoor fans can operate in a balanced manner, thereby improving the operating efficiency of the fan and the energy efficiency of the entire machine throughout the year.

[0040] The above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and changes can be made without departing from the principle of the present invention, and these improvements and changes are also regarded as the protection scope of the present invention.

Claims

1. A high-efficiency and energy-saving indirect heat exchange unit with air-to-air heat exchanger, characterized in that: include: An air-to-air heat exchanger body (12), a water replenishing device (8) and a condenser (3); The water replenishment device (8) is connected to a water storage tank (7), the water storage tank (7) is connected to an evaporator cold water pump (5) and an evaporative cold water drainage device (6), and the evaporator cold water pump (5) is connected to an evaporative cold spray device (4); The condenser (3) is connected to a fluorine system throttle valve (1), the fluorine system throttle valve (1) is connected to an evaporator (10), the evaporator (10) is connected to a fluorine system compressor (9), and a branch pipe is connected between the fluorine system compressor (9) and the condenser (3); A blower fan (11) is provided on one side of the branch pipe, and a condensing fan (2) is provided on one side of the condenser (3); Indoor bypass electric air valves (16) are arranged on both sides of the air-to-air heat exchanger body (12).

2. The high-efficiency and energy-saving indirect heat exchange unit with air-to-air heat exchanger according to claim 1, characterized in that: The water storage tank (7), the evaporator (10) and the evaporative cooling spray device (4) are arranged on the peripheral side of the air-to-air heat exchanger body (12).

3. The high-efficiency and energy-saving indirect heat exchange unit with air-to-air heat exchanger according to claim 2, characterized in that: The water storage tank (7) and the evaporative cooling spray device (4) are arranged on opposite sides of the air-to-air heat exchanger body (12), and the evaporator (10) is arranged on one side of the air-to-air heat exchanger body (12).

4. The high-efficiency and energy-saving indirect heat exchange unit with air-to-air heat exchanger according to claim 1, characterized in that: The air supply fan (11) operates to generate indoor supply air (14) on one side, and indoor return air (13) is provided on one side of the air-to-air heat exchanger body (12).

5. The high-efficiency and energy-saving indirect heat exchange unit with air-to-air heat exchanger according to claim 4, characterized in that: An outdoor air inlet (15) is provided on one side of the air-to-air heat exchanger body (12) close to the water storage tank (7).

6. The high-efficiency and energy-saving indirect heat exchange unit with air-to-air heat exchanger according to claim 4, characterized in that: A mixed air (17) generated by mixing the indoor return air (13) and the outdoor intake air (15) is provided between the indoor bypass electric air valve (16) and the evaporator (10).

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