Air suspension fluorine pump heat pipe air conditioning system with auxiliary evaporator
By adding a direct tube microcontroller evaporator and flow control valve to the air -conditioning system of the computer room, optimizing the cooling work mode, the problem of high power consumption of compressor high -temperature compressor in the low -temperature seasons of the existing technologies, and realizing the annual high -energy efficiency -based air -conditioning system.
Patent Information
- Application Number
- CN202411736363.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-01-21
AI Technical Summary
The existing machine room air conditioning system is difficult to effectively reduce the power consumption of the compressor in the low temperature season, resulting in low energy saving efficiency and almost no energy saving effect in areas such as the central and southern regions with low low temperature climates.
An air-suspended fluorine pump heat pipe air conditioning system with an auxiliary evaporator is designed. By adding a straight-tube micro-channel evaporator and a flow control valve to the system, precise control of the refrigerant flow is achieved, the refrigeration working mode is optimized, and automatic adjustment is performed to improve Energy efficiency.
It achieves a high energy efficiency ratio throughout the year, reduces air conditioning power consumption, does not increase equipment costs, can operate intelligently and stably, and is suitable for various climate conditions.
Smart Images
Figure CN119342774A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of computer room air conditioning, and in particular to an air suspension fluorine pump heat pipe air conditioning system with an auxiliary evaporator. Background Art
[0002] With the development of global informatization, the number of data centers and information and communication rooms has increased rapidly. The use of computer room air conditioners to maintain room temperature control has increased, consuming more and more electricity, and has become the focus of attention of the whole society. Computer room air conditioners are composed of indoor evaporators, outdoor condensers, internal fans, external fans, compressors and other power components. The power consumption of the compressor accounts for more than 70% of the whole machine. Reducing the work and power consumption of the compressor is a key factor in air conditioning energy saving.
[0003] In order to reduce the power consumption of the compressor of the computer room air conditioner, there are currently dual-circuit heat pipe air conditioning technology and fluorine pump integrated air conditioning technology on the market. Dual-circuit heat pipe air conditioning adds a completely independent heat pipe heat exchange circuit on the basis of the existing compressor refrigeration circuit. When the outdoor temperature is low, the heat pipe heat exchange circuit will start, take away the indoor heat of the computer room, automatically reduce the start of the compressor, and thus reduce the power consumption of the compressor. The advantage of this solution is that it can make full use of the indoor and outdoor temperature difference for heat exchange and has high energy-saving efficiency. The disadvantage is that the indoor evaporator, outdoor condenser, and connecting pipes are all double those of traditional computer room air conditioners. The product cost is high, the space occupied is also large, and the use has certain limitations.
[0004] Fluorine pump air conditioner is to connect a liquid pump (referred to as fluorine pump) in series to the return liquid pipeline of the existing air conditioner. When the outdoor temperature is low, the compressor can be turned off and bypassed through the solenoid valve to let the fluorine pump run. The fluorine pump drives the liquid refrigerant into the evaporator, absorbs heat and vaporizes in the evaporator, then enters the outdoor condenser and encounters low temperature to condense into liquid, then returns to the fluorine pump and is driven into the evaporator, and the cycle takes away the indoor heat. The advantages of fluorine pump air conditioner are simple structure, low cost, and can reduce the use of compressors in low temperature seasons to reduce power consumption, which has a certain energy-saving effect. The obvious disadvantage is that the energy-saving efficiency is not high. Since the fluorine pump is connected in series in the compression refrigeration circuit, the fluorine pump and the compressor refrigeration use the same evaporator, and the evaporator adopts a coil structure, which is convenient for the flow of gaseous refrigerant. When the fluorine pump is working, it drives the liquid refrigerant into the evaporator, forming a gas-liquid mixed state in the evaporator, and the flow resistance is large, resulting in uneven heat exchange of the evaporator and a significant decrease in heat exchange capacity, which is far from the rated heat exchange capacity of the air conditioner; secondly, when the fluorine pump is working and the compressor stops in the low temperature season, the inner surface of the outdoor condenser is covered by the compressor refrigeration oil film, which reduces the heat exchange efficiency of the heat exchanger and causes a decrease in heat exchange. Therefore, the fluorine pump operation mode cannot generate enough cooling capacity to meet the needs of the computer room. It can only intervene at extremely low temperatures (generally below 0°C) to achieve a better cooling effect; compared with dual-circuit heat pipe air conditioners, the ambient temperature for the fluorine pump to intervene must be low enough, so the proportion of time it can operate throughout the year is relatively small, and the energy-saving efficiency generated throughout the year is not high, especially in areas such as the central and southern regions where the low temperature climate is not long, there is almost no energy-saving effect, which also leads to limitations in use. Summary of the invention
[0005] The object of the present invention is to provide an air suspension fluorine pump heat pipe air conditioning system with an auxiliary evaporator, which has the effects of automatically adjusting the refrigeration working mode, having a higher annual energy efficiency ratio, and not increasing the equipment cost.
[0006] The above technical objectives of the present invention are achieved through the following technical solutions: an air-suspended fluorine pump heat pipe air-conditioning system with an auxiliary evaporator, comprising a flow control valve, an air-conditioning evaporator, an auxiliary evaporator, a fluorine pump, a compressor, and a second solenoid valve, wherein the flow control valve is used to control the refrigerant flow to the air-conditioning evaporator and / or to control the refrigerant flow to the auxiliary evaporator, the auxiliary evaporator is a microchannel evaporator, the fluorine pump is arranged in series with the auxiliary evaporator, the fluorine pump, the auxiliary evaporator and the air-conditioning evaporator are arranged in parallel, the compressor is an air-suspended compressor or a magnetically suspended compressor, and the second solenoid valve is arranged in parallel with the compressor.
[0007] By adopting the above technical scheme, in order to further improve the energy efficiency level of the machine room air conditioning equipment, the compressor of the present invention is preferably an air suspension centrifugal compressor. The rotor of the air suspension centrifugal compressor is in a suspended state when working, without friction, so there is no need for traditional compressor refrigeration oil, and the entire refrigeration system is in an oil-free state, so that the heat exchange efficiency of the evaporator and the condenser will not be affected by the refrigeration oil and reduced, so the overall heat exchange efficiency is higher, which creates better conditions for using the fluorine pump to work under outdoor low temperature conditions, and gets rid of the dilemma of the compressor refrigeration oil reducing the heat exchange rate faced by the fluorine pump integrated air conditioner. However, the structure of the coil air conditioner evaporator is still not conducive to the evaporation and flow of the gas-liquid mixed refrigerant, and this problem has not been solved, and the air suspension centrifugal compressor is more sensitive to the liquid refrigerant entering the compressor. If the refrigerant is not completely evaporated in the evaporator and enters the air suspension compressor in liquid form, it will cause cavitation on the rotor surface and the air floating reed of the compressor, greatly reducing the service life of the compressor. Therefore, it is a more difficult technical problem for the air suspension compressor machine room air conditioner to work with the fluorine pump.
[0008] In this context, the inventor proposed an air suspension fluorine pump heat pipe air conditioning structure with an auxiliary evaporator through theoretical analysis and repeated actual experiments. This structure adds an auxiliary evaporator to the outside of the air conditioning evaporator of the existing air suspension compressor air conditioning. The auxiliary evaporator does not adopt a coil-type fin structure but a straight tube microchannel structure. The evaporator of this structure is composed of a large number of microtubes with capillary effect. The liquid refrigerant entering it can quickly absorb heat and evaporate, with high heat exchange efficiency and no resistance problem of coil-type evaporators.
[0009] In order to more reasonably distribute the amount of refrigerant entering the air-conditioning evaporator and the heat pipe evaporator, a flow control valve is added to the connecting pipeline of the air-conditioning evaporator and the auxiliary evaporator. The flow control valve accurately controls the refrigerant flow entering the expansion valve according to the opening of the expansion valve, so that the amount of refrigerant entering the air-conditioning evaporator remains appropriate and accurate; the remaining refrigerant flow automatically enters the auxiliary evaporator, and enters the compressor after being vaporized in the auxiliary evaporator.
[0010] It should be noted that, in the present invention, the fluorine pump and the auxiliary evaporator are arranged in series, and the fluorine pump, the auxiliary evaporator and the air-conditioning evaporator are arranged in parallel, which refers to a combination formed by the fluorine pump and the auxiliary evaporator being connected in series, and the combination is arranged in parallel with the air-conditioning evaporator. A microchannel evaporator refers to an evaporator with a microchannel structure, also known as a microchannel heat exchanger.
[0011] The present invention is further configured as follows: it also includes a solenoid valve 1, and the solenoid valve 1 is configured in parallel with the fluorine pump.
[0012] The present invention is further configured as follows: the auxiliary evaporator is a straight tube microchannel evaporator.
[0013] By adopting the above technical solution, the microtubes in the microchannel evaporator are straight tubes.
[0014] The present invention is further configured as follows: it includes a refrigerant pipeline and a first bypass pipeline, the air-conditioning condenser and the flow control valve are installed on the refrigerant pipeline, one end of the first bypass pipeline is connected to the flow control valve, and the other end is connected to the refrigerant pipeline, and the fluorine pump and the auxiliary evaporator are installed on the first bypass pipeline.
[0015] By adopting the above technical solution, the flow control valve can accurately control the refrigerant flow to the air-conditioning evaporator, so that the amount of refrigerant entering the air-conditioning evaporator is maintained at an appropriate amount.
[0016] The present invention is further configured as follows: along the flow direction of the refrigerant, the fluorine pump is located upstream of the auxiliary evaporator.
[0017] The present invention is further configured as follows: it also includes a second bypass pipeline, both ends of the second bypass pipeline are respectively connected to the refrigerant pipeline, and the second solenoid valve is installed on the second bypass pipeline.
[0018] By adopting the above technical solution, the second solenoid valve is arranged in parallel with the compressor.
[0019] The present invention is further configured to include: a third bypass pipeline, both ends of the third bypass pipeline are respectively connected to the first bypass pipeline, and the solenoid valve 1 is installed on the third bypass pipeline.
[0020] By adopting the above technical solution, the electromagnetic valve 1 and the fluorine pump are arranged in parallel.
[0021] The present invention is further configured as follows: it also includes a condenser, a liquid storage device, and an expansion valve, wherein the liquid storage device and the expansion valve are both installed on the refrigerant pipeline, and along the refrigerant flow direction, the liquid storage device is located upstream of the flow control valve, and the flow control valve is located upstream of the expansion valve.
[0022] The present invention is further configured as follows: the flow control valve is an electronic flow control valve.
[0023] The present invention is further configured as follows: the air-conditioning evaporator is a coil evaporator.
[0024] By adopting the above technical solution, the air-conditioning evaporator adopts a conventional coil fin structure.
[0025] The beneficial effects of the present invention are as follows: the present invention has four working modes: a compressor forced refrigeration mode, a mixed refrigeration mode in which the compressor and the fluorine pump work simultaneously, a refrigeration mode in which the compressor stops working and the fluorine pump works, and a gravity heat pipe refrigeration mode in which the compressor and the fluorine pump stop working. As the outdoor temperature changes, the way and speed of the refrigerant condensing outdoors change. The air conditioning system automatically adjusts the working mode according to the outdoor temperature and the refrigerant condensation speed, and preferentially operates in a mode with a relatively high energy efficiency, thereby achieving the goal of significantly reducing the power consumption of the air conditioner. This solution has a high annual energy efficiency ratio, does not increase the high equipment cost, and can operate intelligently and stably, and is a solution that is very worthy of promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a structural schematic diagram of Example 1.
[0027] In the figure, 1. air conditioning evaporator; 2. compressor; 3. condenser; 4. liquid storage device; 5. flow control valve; 6. expansion valve; 7. fluorine pump; 8. auxiliary evaporator; 9. solenoid valve 1; 10. solenoid valve 2; 11. first bypass pipeline; 12. second bypass pipeline; 13. third bypass pipeline; 14. refrigerant pipeline. DETAILED DESCRIPTION
[0028] Example 1: An air suspension fluorine pump heat pipe air conditioning system with an auxiliary evaporator, such as Figure 1 As shown, the air conditioner comprises an air conditioner evaporator 1, a compressor 2, a condenser 3, a liquid storage device 4, and an expansion valve 6, and these components are connected through a refrigerant pipeline 14. The air conditioner evaporator 1 adopts a coil fin structure, and the compressor 2 is an air suspension compressor 2. A flow control valve 5 is installed on the refrigerant pipeline 14 between the liquid storage device 4 and the expansion valve 6, and the flow control valve 5 is an electronic flow control valve 5. Along the refrigerant flow direction, the liquid storage device 4 is located upstream of the flow control valve 5, and the flow control valve 5 is located upstream of the expansion valve 6.
[0029] The flow control valve 5 is connected to a first bypass pipeline 11, and one end of the first bypass pipeline 11 away from the flow control valve 5 is connected to the refrigerant pipeline 14. A fluorine pump 7 and an auxiliary evaporator 8 are installed on the first bypass pipeline 11. The fluorine pump 7 and the auxiliary evaporator 8 are arranged in series. The combination formed by the fluorine pump 7 and the auxiliary evaporator 8 in series is arranged in parallel with the air conditioner evaporator 1. Along the refrigerant flow direction, the fluorine pump 7 is located upstream of the auxiliary evaporator 8. The auxiliary evaporator 8 is a straight tube microchannel heat exchanger, which includes a plurality of thin straight tubes.
[0030] The first bypass pipeline 11 is connected to a third bypass pipeline 13, and both ends of the third bypass pipeline 13 are respectively connected to the first bypass pipeline 11. The third bypass pipeline 13 is equipped with a solenoid valve 9, and the solenoid valve 9 is arranged in parallel with the fluorine pump 7. The air suspension fluorine pump heat pipe air conditioning system with an auxiliary evaporator also includes a second bypass pipeline 12, and both ends of the second bypass pipeline 12 are respectively connected to the refrigerant pipeline 14 upstream of the compressor 2 and the refrigerant pipeline 14 downstream. The second bypass pipeline 12 is equipped with a solenoid valve 10, and the solenoid valve 10 is arranged in parallel with the compressor 2.
[0031] Working principle: The air suspension fluorine pump heat pipe air conditioning system with auxiliary evaporator has four refrigeration working modes:
[0032] Mode 1: Compressor 2 forced cooling, at this time, solenoid valve 2 10 is closed, solenoid valve 1 9 is closed, and fluorine pump 7 does not work. The refrigerant absorbs heat and evaporates in the air conditioner evaporator 1, and the gaseous refrigerant is compressed by the air suspension compressor 2 and enters the outdoor condenser 3 for condensation and then returns to the room, completing the refrigeration cycle, which is called compressor 2 refrigeration mode.
[0033] Mode 2: Mixed refrigeration mode, in which the compressor 2 and the fluorine pump 7 work at the same time, the solenoid valve 2 10 is closed, and the solenoid valve 1 9 is closed. The refrigerant is divided into two by the flow control valve 5, one part enters the air-conditioning evaporator 1 to absorb heat and evaporate, and the other part enters the fluorine pump 7, driven by the fluorine pump 7 to enter the auxiliary evaporator 8 to evaporate, and the gaseous refrigerant enters the air suspension compressor 2, is compressed by the compressor 2, enters the outdoor condenser 3, and condenses and returns to the room, completing the refrigeration cycle. At this time, the compressor 2 and the fluorine pump 7 work at the same time, and the compressor 2 can work at a lower load, and the energy efficiency ratio is higher than that of mode 1, which is called the mixed mode.
[0034] Mode 3: Fluorine pump 7 works, compressor 2 stops working, solenoid valve 2 10 is open, solenoid valve 1 9 is closed, and expansion valve 6 is closed. All refrigerant enters fluorine pump 7 from flow control valve 5, and is driven by fluorine pump 7 to enter the heat pipe evaporator for evaporation. The gaseous refrigerant enters the outdoor condenser 3 for condensation and returns to the room, completing the refrigeration cycle. At this time, fluorine pump 7 works, compressor 2 stops, and the energy efficiency ratio is higher than mode 2, which is called fluorine pump 7 mode.
[0035] Mode 4: When the condensation rate of the refrigerant in the outdoor condenser 3 exceeds the evaporation rate of the refrigerant in the indoor evaporator, and the conditions for natural gravity reflux are met, the compressor 2 and the fluorine pump 7 stop working, at this time, the solenoid valve 2 10 is opened, the solenoid valve 1 9 is opened, and the refrigerant from the flow control valve 5 directly passes through the solenoid valve 1 9 into the auxiliary evaporator 8 for evaporation. Since the refrigerant in the auxiliary evaporator 8 absorbs heat and vaporizes, its temperature is higher than the temperature of the refrigerant in the outdoor condenser 3, so the pressure in the auxiliary evaporator 8 is higher than the pressure in the condenser 3. The gaseous refrigerant enters the outdoor condenser 3 from the auxiliary evaporator 8 under the promotion of the pressure difference, releases heat and condenses into liquid, and then flows back to the room by gravity, completing the refrigeration cycle. At this time, the fluorine pump 7 and the compressor 2 are both stopped, and the energy efficiency ratio is higher than that of mode 3, which is called the gravity heat pipe mode.
[0036] Embodiment 2: An air suspension fluorine pump heat pipe air conditioning system with an auxiliary evaporator, which differs from Embodiment 1 in that the compressor 2 is a magnetic suspension compressor 2.
Claims
1. An air suspension fluorine pump heat pipe air conditioning system with an auxiliary evaporator, characterized in that: The invention comprises a flow control valve (5), an air-conditioning evaporator (1), an auxiliary evaporator (8), a fluorine pump (7), a compressor (2), and a second solenoid valve (10). The flow control valve (5) is used to control the flow of refrigerant flowing to the air-conditioning evaporator (1) and / or to control the flow of refrigerant flowing to the auxiliary evaporator (8). The auxiliary evaporator (8) is a microchannel evaporator. The fluorine pump (7) is arranged in series with the auxiliary evaporator (8). The fluorine pump (7), the auxiliary evaporator (8) and the air-conditioning evaporator (1) are arranged in parallel. The compressor (2) is an air suspension compressor (2) or a magnetic suspension compressor (2). The second solenoid valve (10) is arranged in parallel with the compressor (2).
2. The air suspension fluorine pump heat pipe air conditioning system with an auxiliary evaporator according to claim 1, characterized in that: It also includes an electromagnetic valve (9), which is arranged in parallel with the fluorine pump (7).
3. The air suspension fluorine pump heat pipe air conditioning system with an auxiliary evaporator according to claim 1 or 2, characterized in that: The auxiliary evaporator (8) is a straight tube microchannel evaporator.
4. The air suspension fluorine pump heat pipe air conditioning system with an auxiliary evaporator according to claim 1 or 2, characterized in that: It comprises a refrigerant pipeline (14) and a first bypass pipeline (11); the air-conditioning evaporator (1) and the flow control valve (5) are installed on the refrigerant pipeline (14); one end of the first bypass pipeline (11) is connected to the flow control valve (5), and the other end is connected to the refrigerant pipeline (14); the fluorine pump (7) and the auxiliary evaporator (8) are installed on the first bypass pipeline (11).
5. The air suspension fluorine pump heat pipe air conditioning system with an auxiliary evaporator according to claim 4, characterized in that: Along the refrigerant flow direction, the fluorine pump (7) is located upstream of the auxiliary evaporator (8).
6. The air suspension fluorine pump heat pipe air conditioning system with an auxiliary evaporator according to claim 1 or 2, characterized in that: It also includes a second bypass pipeline (12), the two ends of which are respectively connected to the refrigerant pipeline (14), and the second solenoid valve (10) is installed on the second bypass pipeline (12).
7. The air suspension fluorine pump heat pipe air conditioning system with an auxiliary evaporator according to claim 4, characterized in that: It also includes a third bypass pipeline (13), the two ends of which are respectively connected to the first bypass pipeline (11), and the solenoid valve 1 (9) is installed on the third bypass pipeline (13).
8. The air suspension fluorine pump heat pipe air conditioning system with an auxiliary evaporator according to claim 1 or 2, characterized in that: It also includes a condenser (3), a liquid storage device (4), and an expansion valve (6). The liquid storage device (4) and the expansion valve (6) are both installed on the refrigerant pipeline (14). Along the refrigerant flow direction, the liquid storage device (4) is located upstream of the flow control valve (5), and the flow control valve (5) is located upstream of the expansion valve (6).
9. The air suspension fluorine pump heat pipe air conditioning system with an auxiliary evaporator according to claim 1 or 2, characterized in that: The flow control valve (5) is an electronic flow control valve (5).
10. The air suspension fluorine pump heat pipe air conditioning system with an auxiliary evaporator according to claim 1 or 2, characterized in that: The air-conditioning evaporator (1) is a coil-type evaporator.