CN205048616U - Fluorine pump dual cycle cooling water set cold -storage system - Google Patents

Abstract

The utility model discloses a cold storage system of a fluorine pump double-circulation chiller, which comprises a cold storage heat exchanger and a condensing heat pipe array placed in the external environment. The evaporation heat pipe array; the evaporation heat pipe array in the airtight water tank is used as the evaporation section of the heat pipe, and the steam outlet on the top is connected with the condensation heat pipe array of the external environment through the evaporation pipe. The heat pipes are arranged vertically, and each column of spiral heat pipes is wound by two spiral heat pipes, and the inner wall of the spiral heat pipes is provided with a liquid-absorbing core layer; A pump and a control valve; the evaporating tubes of the evaporating heat pipe array are also connected in parallel with a refrigeration compressor. The utility model has a small volume, uses the high-efficiency heat transfer performance of the gravity heat pipe to store the natural cooling source of the external environment in the phase-change refrigerant, and effectively utilizes the latent heat of the refrigerant.

Description

A cold storage system of a fluorine pump double-circulation chiller

technical field

The utility model belongs to the refrigeration technical field of air-conditioning units, in particular to a data center machine room refrigeration storage system utilizing a natural cold source.

Background technique

Data centers have high requirements on the continuous cooling capacity of refrigeration equipment. When the external power supply is cut off, UPS can be used to supply power to IT equipment, but it is usually not enough to supply power to air conditioning equipment that also consumes a lot of power. It can only supply power to fans, water pumps, etc. Devices that consume less power. Therefore, when the data center is powered off, the temperature of the cold source delivered by the air conditioner in the computer room will quickly rise to about 40°C within 2 to 3 minutes, which cannot provide enough cold source for the computer room, which may easily cause downtime or damage to the electronic equipment in the computer room . At present, the power-off relay of the air conditioner in the computer room adopts a large water system cold storage tank, which is bulky and takes up a lot of space, which brings trouble to the heat preservation work and causes low energy-saving efficiency of the system.

Contents of the invention

Purpose of the invention: In view of the existing problems and deficiencies mentioned above, the purpose of this utility model is to provide a gravity heat pipe type water-cooled unit cold storage system, which has a small volume and utilizes the high-efficiency heat transfer performance of the gravity heat pipe to store the natural cold source of the external environment In the phase-change refrigerant, the latent heat of the refrigerant is effectively utilized.

Technical solution: In order to achieve the purpose of the above invention, the technical solution adopted by the utility model is: a cold storage system of a fluorine pump double-circulation chiller, the chiller is provided with a cold water pipeline for cold water, including a cold storage heat exchanger and An array of condensing heat pipes for the environment, the cold storage heat exchanger includes a closed water tank storing refrigerant and an array of evaporative heat pipes inside the closed water tank, the closed water tank is provided with an inlet and an outlet, and the inlet and outlet pass through the pipeline and the chiller The cold water pipes are connected in parallel, and the incorporation of the cold storage heat exchanger is controlled by the valve on the pipe; the evaporation heat pipe array in the closed water tank is used as the evaporation section of the heat pipe, and the steam outlet on the top passes through the condensation of the evaporation pipe and the external environment The heat pipe array is connected; the condensation heat pipe array is used as the condensation section of the heat pipe, and the bottom is connected to the evaporation heat pipe array through the liquid return pipe to form a circulation, and the condensation heat pipe array is also equipped with spray water washing and/or cooling fan for cooling; Both the evaporating heat pipe array and the condensing heat pipe array are composed of multiple rows of spiral heat pipes arranged vertically, and each row of spiral heat pipes is formed by winding two spiral heat pipes, and the inner wall of the spiral heat pipes is provided with a liquid-absorbing core layer; the evaporating heat pipe array A refrigeration compressor is also connected in parallel on the vapor pipe, and the integration or disconnection of the refrigeration compressor is realized through a control valve. The liquid return pipe is also connected in parallel with a refrigerant pump, and the integration or disconnection of the refrigerant pump is realized through a control valve. disconnect.

As a further improvement, the airtight water tank is also connected with a refrigerant buffer container, so as to prevent the refrigerant from freezing, expanding and overflowing.

As a further improvement, the outer wall of the airtight water tank is provided with a coil layer, and the periphery of the coil layer is provided with an insulation layer. When the refrigerant in the water tank freezes excessively, the hot air from the machine room or other heat sources can be circulated in the coil in the coil layer for heat exchange; Play the role of thermal insulation.

As a further improvement, the outer wall of the 1/2-2/3 part of the upper end of the evaporating heat pipe array is smooth, and the outer wall of the remaining part is provided with annular fins. Since the heat pipe in the utility model adopts two coiled spiral heat pipes and is immersed in the refrigerant to absorb heat to evaporate the working medium, and the length of the pipe is about 1m, the evaporation heat absorption section is at the upper part of the pipe during this process, so the outer wall of the heat pipe first starts to form from the middle and upper parts. For ice, the annular fins are only provided in the lower section, which is beneficial for the freezing speed of the lower section to catch up with the middle and upper parts, so as to achieve uniform icing. In addition, it is more important to maintain a larger distance between the two heat pipes in the middle and upper sections, which is beneficial to heat transfer.

As a further improvement, the distance between the heat pipes in the evaporating heat pipe array and the condensing heat pipe array is 8-30 cm, preferably 15 cm.

Further improvement, the refrigerant is water, ethylene glycol aqueous solution, 30% to 45% calcium chloride aqueous solution, or an aqueous solution containing 20% to 40% sodium sulfate decahydrate and 15% to 25% sodium acetate trihydrate, Or an aqueous solution containing 20% to 40% sodium sulfate decahydrate and 15% to 30% calcium chloride.

As a further improvement, the spiral heat pipe adopts a copper tube, and the liquid-absorbing core layer on the inner wall is a porous copper foam layer, which has microporous capillary action, efficiently absorbs and collects the working medium condensate, reflows it, evaporates and absorbs heat again, and has low sintering cost .

As a further improvement, a three-way valve is provided at the connection between the closed water tank and the cold water pipe of the chiller, so as to control whether the cold storage system is connected to the chiller, or both.

Further, the outer diameter of each row of spiral heat pipes is 14-45cm, the diameter of each spiral heat pipe is 5-15cm, and the lead is 5-12cm; the winding directions of the two rows of spiral heat pipes in each row of spiral heat pipes are the same or the other way around. When the two spiral heat pipes are reversely wound, there is a larger gap, heat transfer area and heat transfer space between the two pipes, which is conducive to the uniform flow of the refrigerant.

Beneficial effects: compared with the prior art, the utility model has the following advantages: through the cold storage system, only the fan and the auxiliary equipment of the water pump are turned on when the power is cut off, and combined with the advantages of the heat pipe type and fluorine pump compression refrigeration, it can also continue to serve as The data room provides cooling capacity for 10 to 15 minutes, so that there is enough time to start the backup power supply of the data room; the fluorine pump double-cycle cold storage technology combines the advantages of heat pipe and compression refrigeration to ensure the safety of the data center and achieve the purpose of energy saving .

Description of drawings

Fig. 1 is the structural representation of the cold storage system described in the utility model;

Fig. 2 is the schematic diagram of the principle of the cold storage system described in the utility model;

Fig. 3 is a structural schematic diagram of the spiral heat pipe of the present invention.

Among them, chiller 1, cold storage heat exchanger 2, condensing heat pipe array 3, closed water tank 4, evaporating heat pipe array 5, cold water pipe 6, refrigerant buffer tank 7, valve 8, spiral heat pipe 9, refrigeration compressor 10, refrigerant pump 11. Fan 12.

detailed description

Below in conjunction with accompanying drawing and specific embodiment, further set forth the utility model, should be understood that these embodiments are only used for illustrating the utility model and are not intended to limit the scope of the utility model, after having read the utility model, those skilled in the art will understand this utility model The modifications of various equivalent forms of the utility model all fall within the scope defined by the appended claims of the present application.

As shown in Figure 1, the cold storage system of the fluorine pump double-circulation chiller of the present utility model mainly includes: a cold storage heat exchanger and a condensing heat pipe array placed in the external environment, and the cold storage heat exchanger includes a closed water tank storing refrigerant and An array of evaporative heat pipes located inside the closed water tank, the inlet and outlet of the closed water tank are connected in parallel with the cold water pipeline of the chiller through the pipeline, and the incorporation of the cold storage heat exchanger is controlled through the valve on the pipeline, and the water tank is also connected There is a refrigerant buffer tank to buffer the expansion of the refrigerant as it freezes. The evaporation heat pipe array in the airtight water tank is used as the evaporation section of the heat pipe, and the steam outlet at the top communicates with the condensation heat pipe array of the external environment through the evaporation pipe; It is connected with the evaporating heat pipe array to form a circulation, and the condensing heat pipe array is also equipped with spray water washing and/or cooling fan for cooling, and the condensing heat pipe array is higher than the evaporating heat pipe array to form a gravity difference; the evaporating heat pipe array and the condensing heat pipe The arrays are all composed of multiple rows of spiral heat pipes arranged vertically, and each row of spiral heat pipes is formed by winding two spiral heat pipes with an inner diameter of 3-8 cm, and the inner wall of the spiral heat pipes is provided with a liquid-absorbing core layer. The stroke of the spiral tube is longer than that of the straight tube, and it has a larger heat exchange area and working medium capacity. Especially when the double tubes are arranged in a spiral coil, a smaller space can be exchanged for a larger heat exchange area.

When the environment is in a high temperature environment such as summer, when the environment cannot provide enough cold sources for the cold storage equipment, in the above scheme, a fluorine pump double-circulation cold storage device can also be introduced, that is, a cooling system is installed on the liquid return pipe of the evaporative heat pipe array. The agent pump and the control valve force the condensate of the working medium to return. At the same time, the evaporation tube of the evaporation heat pipe array is also connected in parallel with a refrigeration compressor (ie, a fluorine pump). The refrigeration compressor can be in various forms such as scroll, screw, centrifugal and magnetic levitation. When the load changes suddenly, the cold storage water tank and the air-cooled water unit operate at the same time to increase the cooling capacity of the unit; if some of the multiple chillers on site fail, the cold storage mode is turned on to release the cooling capacity to ensure continuous supply of cooling capacity.

There are two modes of cold storage in the cold storage pool: when the outdoor cold source can be used, it is preferable to use the fluorine pump circulation natural cold source type for cold storage; when the outdoor natural cold source is not available, the compressor mode is used for cold storage. When the fluorine pump double-circulation cold storage type air-cooled chiller is used in the data center, it can not only improve the safety of the data center, but also make the data center still have cold supply when the power is cut off or the host equipment fails, reducing the downtime of the data center It can also make full use of the outdoor low temperature environment and store cold in the mode of natural cold source, so as to achieve the effect of energy saving.

In addition, the heat release side of the fluorine pump double-circulation cold storage type can be air-cooled, or it can be a cooling method using cooling water. When cooling water is used as a cold source, not only the cold storage function can be realized, but also continuous cooling can be realized. Because the power consumption of the cooling tower is not large, the operation can still be guaranteed by the UPS. When the outdoor temperature is low, the cooling tower can continue to provide cooling capacity to further improve the safety of the data center.

In the above scheme, the refrigerant can be directly water, or an aqueous solution of calcium chloride with a large latent heat. As a preferred option, an aqueous solution containing 20% to 40% sodium sulfate decahydrate and 15% to 25% sodium acetate trihydrate, or 20% to 40% sodium sulfate decahydrate and 15% to 30% calcium chloride Because the freezing phase transition temperature of the above-mentioned mixed refrigerant can reach 5-27°C, it can effectively use the external ambient temperature through its latent heat of phase transition in summer when the temperature is relatively high, especially the spray water washing outside the matching condensing heat pipe The air cooler can effectively utilize the ambient cold source.

As a preferred solution, the outer wall of the upper end of the evaporating heat pipe array is 1/2 to 2/3 smooth, and the outer wall of the rest is provided with annular fins. Since the heat pipe in the utility model adopts two coiled spiral heat pipes and is immersed in the refrigerant to absorb heat to evaporate the working medium, and the length of the pipe is about 1m, the evaporation heat absorption section is at the upper part of the pipe during this process, so the outer wall of the heat pipe first starts to form from the middle and upper parts. For ice, the annular fins are only provided in the lower section, which is beneficial for the freezing speed of the lower section to catch up with the middle and upper parts, so as to achieve uniform icing. In addition, it is more important to maintain a larger distance between the two heat pipes in the middle and upper sections, which is beneficial to heat transfer. Further, the distance between the heat pipes in the evaporating heat pipe array and the condensing heat pipe array is 8-30 cm, preferably 15 cm, so as to prevent the water tank from completely freezing under the premise of ensuring a certain cooling density.

Further, the spiral heat pipe adopts a copper tube, and the liquid-absorbing core layer on the inner wall is a porous copper foam layer, which has a microporous capillary action to efficiently absorb and collect the condensate of the working medium, return it to evaporate and absorb heat again. During production, sodium chloride and electrolytic copper powder can be sintered under protective gas to form a microporous copper foam layer with a mesh structure, which is conducive to the reflux of condensed water.

Claims (9)

1. A fluorine pump double-circulation chiller cold storage system, said chiller is provided with a cold water pipeline for cold water, characterized in that it includes a cold storage heat exchanger and a condensing heat pipe array placed in the external environment, said cold storage heat exchanger It includes a closed water tank storing refrigerant and an array of evaporative heat pipes inside the closed water tank. The closed water tank is provided with an inlet and an outlet. The valve controls the incorporation of the cold storage heat exchanger; the evaporation heat pipe array in the closed water tank is used as the evaporation section of the heat pipe, and the steam outlet at the top communicates with the condensation heat pipe array of the external environment through the evaporation pipe; the condensation heat pipe array is used as the heat pipe's Condensation section, and the bottom is connected to the evaporation heat pipe array through the liquid return pipe to form a circulation; the steam pipe of the evaporation heat pipe array is also connected in parallel with a refrigeration compressor, and the integration or disconnection of the refrigeration compressor is realized through the control valve. The liquid return pipe is also connected in parallel with a refrigerant pump, and the connection or disconnection of the refrigerant pump is realized through a control valve. 2. The cold storage system of the fluorine pump double-circulation chiller according to claim 1, characterized in that: the condensing heat pipe array is also equipped with spray water washing and/or cooling fan for cooling; the evaporating heat pipe array and the condensing heat pipe array are both It consists of multiple rows of spiral heat pipes arranged vertically, each row of spiral heat pipes is formed by winding two spiral heat pipes, and the inner wall of the spiral heat pipes is provided with a liquid-absorbing core layer. 3. The cold storage system of the fluorine pump double-circulation chiller according to claim 1, characterized in that: the airtight water tank is also connected with a refrigerant buffer container. 4. The cold storage system of the fluorine pump double-circulation chiller according to claim 1, characterized in that the outer wall of the airtight water tank is provided with a coil layer, and the periphery of the coil layer is provided with an insulation layer. 5. The cold storage system of the fluorine pump double-circulation chiller according to claim 4, characterized in that: the outer wall of the upper end of the evaporating heat pipe array is smooth, and the outer wall of the remaining part is provided with annular fins . 6. The cold storage system of the fluorine pump double-circulation chiller according to claim 1, characterized in that: the distance between the heat pipes in the evaporating heat pipe array and the condensing heat pipe array is 8-30 cm. 7. The cold storage system of a fluorine pump double-circulation chiller according to claim 2, wherein the spiral heat pipe is made of copper, and the liquid-absorbing core layer on the inner wall is a porous foam copper layer. 8. The cold storage system of the fluorine pump double-circulation chiller according to claim 1, characterized in that: a three-way valve is provided at the connection between the closed water tank and the cold water pipeline of the chiller. 9. The cold storage system of the fluorine pump double-circulation chiller according to claim 2, characterized in that: the outer diameter of each row of spiral heat pipes is 14-45 cm, the diameter of each spiral heat pipe is 5-15 cm, and the lead is 5-12cm; the winding directions of the two rows of spiral heat pipes in each row of spiral heat pipes are the same or opposite.