Ventilation wall type double-cold-source coil pipe air conditioning system

Abstract

According to the ventilation wall type double-cold-source coil pipe air conditioning system, the space structure advantages of a ventilation wall air conditioner are combined, the size and the position of the double-cold-source coil pipe are adjusted, the refrigeration effect of the air conditioner is improved, a draught fan is located on one side of the double-cold-source coil pipe to form a ventilation wall type structure, the air speed of an air outlet is reduced, and the lower the resistance of the air side of the whole machine is. The power consumption of the fan is reduced, and the annual operation energy efficiency ratio of the unit can be improved. The air conditioning system comprises three refrigeration modes including a natural cold source mode, a mixed refrigeration mode and a mechanical refrigeration mode. Wherein the natural cold source mode adopts a dry cooler to carry out temperature control on an indoor thermal load, the mixed refrigeration mode carries out heat exchange on a refrigerant generated by a compressor and cold water from the dry cooler through a plate heat exchanger, further refrigeration is carried out on the indoor temperature, and the two modes do not completely depend on mechanical refrigeration of the compressor. And a certain energy-saving effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to a wind wall type double cold source coil air conditioning system. Background Art

[0002] With the rapid development of information technology, the heat dissipation in data centers is increasing, and servers in the rooms need better heat dissipation conditions. The heat dissipation problem of servers is related to the stability and safety of equipment operation. Poor heat dissipation will lead to a serious decline in computer performance and affect the reliability of server operation. In serious cases, it will also affect the use and life of other computer components.

[0003] In response to the above problems, people are committed to developing air conditioning systems that can efficiently dissipate heat for data centers. At the same time, in order to improve the safety of air conditioning systems, dual-cold source air conditioners are being chosen by more and more users. However, with the rapid growth of the heat generation power of electronic components, the disadvantage of ordinary dual-cold source air conditioners in the same framework is gradually magnified. In traditional refrigeration equipment, the fan is generally placed on the top, with the dual-cold source coil below and the compressor at the bottom. This structure limits the size of the coil and the air supply area of ​​the fan is also greatly reduced, resulting in the overall cooling capacity being limited to a certain range and the space utilization rate being reduced. In addition, traditional dual-cold source air conditioners only use mechanical refrigeration, the compressor is always in the starting state, the refrigeration method is single and the energy consumption is serious. Utility Model Content

[0004] The utility model provides a wind wall type double cold source coil air conditioning system, which is used to solve the technical problems raised in the background technology.

[0005] The technical solution adopted by the utility model to solve the above technical problems is:

[0006] A wind wall type double cold source coil air conditioning system, comprising: a compressor, a gas-liquid separator, a mechanical refrigeration evaporator, a fan, an electronic expansion valve, a drying filter, a solenoid valve, a plate heat exchanger, a cooling water valve, a dry cooler, a natural cold source water valve and a natural cold source heat exchanger, wherein at least one fan is provided and is located on one side of the mechanical refrigeration evaporator, and the natural cold source heat exchanger is located on the side of the mechanical refrigeration evaporator away from the fan.

[0007] The outlet end of the mechanical refrigeration evaporator is connected in sequence to the first port and the second port of the gas-liquid separator, the first port and the second port of the compressor, the first port and the second port of the plate heat exchanger, the solenoid valve, the drying filter, the electronic expansion valve, and the inlet end of the mechanical refrigeration evaporator; the outlet end of the natural cold source heat exchanger is connected in sequence to the natural cold source water valve, the dry cooler, the third port and the fourth port of the plate heat exchanger, the cooling water valve, and the inlet end of the natural cold source heat exchanger.

[0008] As a further preference of the present invention, the air-conditioning system includes a natural cold source mode; in the natural cold source mode, the solenoid valve is closed, the cooling water valve is closed, the natural cold source water valve is opened, and a natural cold circulation passage is formed between the outlet of the natural cold source heat exchanger, the dry cooler, and the inlet of the natural cold source heat exchanger.

[0009] As a further preference of the utility model, the air-conditioning system includes a hybrid refrigeration mode; in the hybrid refrigeration mode, the solenoid valve is opened, the cooling water valve is opened, the natural cold source water valve is opened, and a first refrigeration cycle is formed between the outlet of the mechanical refrigeration evaporator, the first port and the second port of the gas-liquid separator, the inlet port and the second port of the compressor, the first port and the second port of the plate heat exchanger, the drying filter, the electronic expansion valve, and the inlet of the mechanical refrigeration evaporator; a second refrigeration cycle is formed between the outlet of the natural cold source heat exchanger, the dry cooler, and the inlet of the natural cold source heat exchanger; in this mode, the refrigerant generated by the compressor is heat exchanged with the cold water from the dry cooler through the plate heat exchanger.

[0010] As a further preference of the utility model, the air-conditioning system also includes a mechanical refrigeration mode; in the mechanical refrigeration mode, the solenoid valve is opened, the cooling water valve is opened, the natural cold source water valve is closed, and a mechanical refrigeration circulation passage is formed between the outlet of the mechanical refrigeration evaporator, the first port and the second port of the gas-liquid separator, the inlet port and the second port of the compressor, the first port and the second port of the plate heat exchanger, the dry filter, the electronic expansion valve, and the inlet of the mechanical refrigeration evaporator; in this mode, the refrigerant generated by the compressor is heat exchanged with the cold water from the dry cooler through the plate heat exchanger.

[0011] As a further preferred embodiment of the present invention, the fan is an EC fan.

[0012] As a further preferred embodiment of the present invention, a sight glass is provided between the second port of the plate heat exchanger and the drying filter.

[0013] As a further preferred embodiment of the present invention, the gas-liquid separator has a gas inlet, a gas outlet and a liquid outlet, the gas inlet and gas outlet are located at the top and on different sides, and the liquid outlet is located at the bottom; the first port is the gas inlet, and the second port is the gas outlet.

[0014] As a further preferred embodiment of the present invention, the coolant in the dry cooler is ethylene glycol solution.

[0015] Compared with the prior art, the utility model has the following advantages or technical effects:

[0016] The utility model combines the spatial structural advantages of the wind wall air conditioner and adjusts the size and position of the dual cold source coil (mechanical refrigeration evaporator and natural cold source heat exchanger). The coil size is not limited, and the larger the size, the better the cooling capacity of the air conditioner. The fan is placed on one side of the dual cold source coil to form a wind wall structure. The air outlet wind speed is optimized due to the structural adjustment of the dual coil: the air outlet wind speed of the traditional dual cold source air conditioner is as high as 5~6m / s, and the air outlet wind speed of the wind wall air conditioner is within 2.5m / s. The lower the air outlet wind speed, the lower the air side resistance of the whole machine, the lower the power consumption of the fan, and the energy efficiency ratio of the unit can be improved throughout the year.

[0017] The wind wall type natural cold source air conditioning system provided by the utility model includes: natural cold source mode, mixed cooling mode and mechanical cooling mode. When the system enters the natural cold source mode, the cold water from the dry cooler enters the natural cold source heat exchanger of the indoor unit to achieve temperature control of the indoor heat load. In this mode, the compressor is in a closed state, thereby achieving the purpose of energy saving and environmental protection. When the system enters the mixed cooling mode, the natural cold source heat exchanger still has a certain cooling capacity. When its capacity is insufficient, the refrigerant generated by the compressor is heat exchanged with the cold water from the dry cooler through the plate heat exchanger to further cool and cool the indoor temperature, thereby meeting the air supply temperature requirements of the machine room. This mode belongs to the mixed operation mode, and compared with the mechanical cooling that completely relies on the compressor, it still has a certain energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention and its features, appearance and advantages will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings. The same reference numerals indicate the same parts in all the drawings. The drawings are not drawn to scale, but the emphasis is on illustrating the subject matter of the present invention.

[0019] Figure 1 It is a schematic diagram of the system structure of the utility model;

[0020] In the figure, 1. compressor, 2. gas-liquid separator, 3. mechanical refrigeration evaporator, 4. fan, 5. electronic expansion valve, 6. dry filter, 7. sight glass, 8. solenoid valve, 9. plate heat exchanger, 10. cooling water valve, 11. dry cooler, 12. natural cooling source water valve, 13. natural cooling source heat exchanger. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention are described below in conjunction with the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the protection scope of the present invention. Example

[0022] Please refer to the attached Figure 1 The utility model provides a wind wall type double cold source coil air conditioning system, including a compressor 1, a gas-liquid separator 2, a mechanical refrigeration evaporator 3, a fan 4, an electronic expansion valve 5, a filter dryer 6, a solenoid valve 8, a plate heat exchanger 9, a cooling water valve 10, a dry cooler 11, a natural cold source water valve 12 and a natural cold source heat exchanger 13. At least one fan is provided, which is located on one side of the mechanical refrigeration evaporator 3, and the natural cold source heat exchanger 13 is located on the side of the mechanical refrigeration evaporator 3 away from the fan 4. Preferably, the fan 4 adopts a centrifugal fan. The utility model combines the spatial structure advantage of the wind wall air conditioner, adjusts the size and position of the double cold source coil, and the coil size is not limited. The larger the size, the better the cooling capacity of the air conditioner. The fan is placed on one side of the double cold source coil to form a wind wall structure. Compared with the traditional machine room air conditioner, it has lower air side resistance, thereby reducing the operating power of the fan and improving the annual energy efficiency ratio of the unit.

[0023] The outlet end of the mechanical refrigeration evaporator 3 is connected in sequence to the first port and the second port of the gas-liquid separator 2, the first port and the second port of the compressor 1, the first port and the second port of the plate heat exchanger 9, the solenoid valve 8, the dry filter 6, the electronic expansion valve 5, and the inlet end of the mechanical refrigeration evaporator 3. The outlet end of the natural cold source heat exchanger 13 is connected in sequence to the natural cold source water valve 12, the dry cooler 11, the third port and the fourth port of the plate heat exchanger 9, the cooling water valve 10, and the inlet end of the natural cold source heat exchanger 13.

[0024] Further explanation, a sight glass 7 is provided between the second port of the plate heat exchanger 9 and the filter drier 6, through which the liquid level and flow of the compressor refrigerant are observed to ensure the normal operation of the air conditioning system. The gas-liquid separator 2 has a gas inlet, a gas outlet and a liquid outlet. The gas inlet and the gas outlet are located at the top and on different sides, and the liquid outlet is located at the bottom. Figure 1 The first port is a gas inlet, and the second port is a gas outlet. The coolant in the dry cooler 11 is an ethylene glycol solution, which is used to perform heat exchange on the liquid in the tube.

[0025] Compared with the traditional air conditioning system with only single mechanical refrigeration, the wind wall type dual cold source coil air conditioning system can provide natural cold source mode, mixed cooling mode and mechanical cooling mode.

[0026] When the ambient temperature is low, the system enters the natural cooling source mode. At this time, the solenoid valve 8 is closed, the cooling water valve 10 is closed, the natural cooling source water valve 12 is opened, and a natural cooling circulation path is formed between the outlet of the natural cooling source heat exchanger 13, the dry cooler 11, and the inlet of the natural cooling source heat exchanger 13. The cold water from the dry cooler enters the natural cooling source heat exchanger 13 of the indoor unit to achieve temperature control of the indoor heat load. In this mode, the compressor is in a closed state, thereby achieving the significance of energy saving and environmental protection.

[0027] As the indoor temperature rises, when the cold water from the dry cooler 11 can no longer fully bear the heat load generated by the data center, the compressor is started and the system enters the mixed cooling mode. At this time, the solenoid valve 8 is opened, the cooling water valve 10 is opened, and the natural cold source water valve 12 is opened. The outlet of the mechanical refrigeration evaporator 3, the first port and the second port of the gas-liquid separator 2, the first port and the second port of the compressor 1, the first port and the second port of the plate heat exchanger 9, the drying filter 6, the electronic expansion valve 5, and the inlet of the mechanical refrigeration evaporator 3 form a first refrigeration cycle path; the outlet of the natural cold source heat exchanger 13, the dry cooler 11, and the inlet of the natural cold source heat exchanger 13 form a second refrigeration cycle path. The refrigerant generated by the compressor 1 is cooled by the cold water from the dry cooler 11 when passing through the plate heat exchanger 9 to form a refrigeration compression cycle. In this mode, the natural cold source heat exchanger 13 still has some cooling capacity. When its capacity is insufficient, the refrigerant generated by the compressor 1 is exchanged with the cold water from the dry cooler 11 through the plate heat exchanger 9 to further cool the indoor temperature, thereby meeting the air supply temperature requirement of the machine room. This mode belongs to the mixed operation mode. Compared with the mechanical refrigeration that completely relies on the compressor, this mode still has a certain energy-saving effect.

[0028] When the water temperature in the dry cooler 11 further increases and cannot provide cooling capacity to the natural cold source heat exchanger 13, the system enters the mechanical refrigeration mode. At this time, the solenoid valve 8 is opened, the cooling water valve 10 is opened, and the natural cold source water valve 12 is closed. A mechanical refrigeration circulation path is formed between the outlet of the mechanical refrigeration evaporator 3, the first port and the second port of the gas-liquid separator 2, the first port and the second port of the compressor 1, the first port and the second port of the plate heat exchanger 9, the drying filter 6, the electronic expansion valve 5, and the inlet of the mechanical refrigeration evaporator 3. The refrigerant generated by the compressor 1 is cooled by the cold water from the dry cooler 11 when passing through the plate heat exchanger 9 to form a refrigeration compression cycle. In this mode, the refrigeration demand from the data center is completely provided by the compressor with 100% mechanical refrigeration. The compressor refrigeration cycle system is a conventional water cooling system. Compared with the mixed operation mode and the natural cold source mode, the unit input power in this mode is the largest and the energy efficiency ratio is the lowest.

[0029] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present invention.

Claims

1. A wind wall type double cold source coil air conditioning system, characterized in that: include: A compressor (1), a gas-liquid separator (2), a mechanical refrigeration evaporator (3), a fan (4), an electronic expansion valve (5), a filter dryer (6), a solenoid valve (8), a plate heat exchanger (9), a cooling water valve (10), a dry cooler (11), a natural cold source water valve (12) and a natural cold source heat exchanger (13), wherein at least one fan is provided and is located on one side of the mechanical refrigeration evaporator (3), and the natural cold source heat exchanger (13) is located on a side of the mechanical refrigeration evaporator (3) away from the fan (4); The outlet end of the mechanical refrigeration evaporator (3) is sequentially connected to the first port and the second port of the gas-liquid separator (2), the first port and the second port of the compressor (1), the first port and the second port of the plate heat exchanger (9), the solenoid valve (8), the filter dryer (6), the electronic expansion valve (5), and the inlet end of the mechanical refrigeration evaporator (3); the outlet end of the natural cold source heat exchanger (13) is sequentially connected to the natural cold source water valve (12), the dry cooler (11), the third port and the fourth port of the plate heat exchanger (9), the cooling water valve (10), and the inlet end of the natural cold source heat exchanger (13).

2. The wind wall type double cold source coil air conditioning system according to claim 1, characterized in that: The air conditioning system includes a natural cooling source mode; In the natural cooling source mode, the solenoid valve (8) is closed, the cooling water valve (10) is closed, the natural cooling source water valve (12) is opened, and a natural cooling circulation path is formed between the outlet of the natural cooling source heat exchanger (13), the dry cooler (11), and the inlet of the natural cooling source heat exchanger (13).

3. The wind wall type double cold source coil air conditioning system according to claim 1, characterized in that: The air conditioning system includes a hybrid cooling mode; In the mixed refrigeration mode, the solenoid valve (8) is opened, the cooling water valve (10) is opened, the natural cold source water valve (12) is opened, and a first refrigeration cycle path is formed between the outlet of the mechanical refrigeration evaporator (3), the first port and the second port of the gas-liquid separator (2), the first port and the second port of the compressor (1), the first port and the second port of the plate heat exchanger (9), the drying filter (6), the electronic expansion valve (5), and the inlet of the mechanical refrigeration evaporator (3); and a second refrigeration cycle path is formed between the outlet of the natural cold source heat exchanger (13), the dry cooler (11), and the inlet of the natural cold source heat exchanger (13). In this mode, the refrigerant generated by the compressor (1) is heat exchanged with cold water from the dry cooler (11) through the plate heat exchanger (9).

4. The wind wall type double cold source coil air conditioning system according to claim 1, characterized in that: The air conditioning system also includes a mechanical refrigeration mode; In the mechanical refrigeration mode, the solenoid valve (8) is opened, the cooling water valve (10) is opened, the natural cooling source water valve (12) is closed, and a mechanical refrigeration circulation path is formed between the outlet of the mechanical refrigeration evaporator (3), the first port and the second port of the gas-liquid separator (2), the first port and the second port of the compressor (1), the first port and the second port of the plate heat exchanger (9), the dry filter (6), the electronic expansion valve (5), and the inlet of the mechanical refrigeration evaporator (3); in this mode, the refrigerant generated by the compressor (1) is heat exchanged with cold water from the dry cooler (11) through the plate heat exchanger (9).

5. The wind wall type double cold source coil air conditioning system according to claim 1, characterized in that: The fan (4) is an EC fan.

6. The wind wall type double cold source coil air conditioning system according to claim 1, characterized in that: A sight glass (7) is provided between the second port of the plate heat exchanger (9) and the filter drier (6).

7. The wind wall type double cold source coil air conditioning system according to claim 1, characterized in that: The gas-liquid separator (2) has a gas inlet, a gas outlet and a liquid outlet, the gas inlet and the gas outlet are located at the top and on different sides, and the liquid outlet is located at the bottom; the first port is the gas inlet, and the second port is the gas outlet.

8. The wind wall type double cold source coil air conditioning system according to claim 1, characterized in that: The coolant in the dry cooler (11) is ethylene glycol solution.

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