A control method for a composite computer room air conditioning system

Abstract

The invention discloses a composite computer room air-conditioning system and a control method thereof, comprising a refrigeration unit, a heat pipe unit and a three-way valve; the refrigeration unit comprises one or more compressors, a refrigeration condenser, a throttling device and a low-pressure liquid accumulator; The heat pipe unit includes a low-pressure accumulator, evaporator, refrigerant pump and heat pipe condenser; the refrigeration unit and the heat pipe unit are coupled at the low-pressure accumulator; a composite computer room air-conditioning system controls the flow of refrigerant inside the low-pressure accumulator Temperature is used as the precise control parameter of the cooling output of the system; a compound computer room air conditioning system controls the switching of the three-way valve according to the outdoor ambient temperature, and runs the refrigeration cycle, compound cycle and heat pipe cycle respectively, which is suitable for the cooling needs of all-weather air conditioners such as computer rooms and base stations , to maximize the use of natural cold sources in day and night, transitional seasons and winter; the system design is compact, reliable, energy-saving and environmentally friendly, and has high thermal efficiency, good stability, and high adjustment accuracy.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a control method for a composite machine room air conditioning system. Background technique [0002] The rapid development of information industry and digital construction has promoted the number of computer rooms and base stations, and the construction scale has increased rapidly. According to statistics, the energy consumption of air conditioners in computer rooms and base stations accounts for 40% to 50% of the total energy consumption. The sensible heat load ratio of the computer room and the base station is large, and it needs to be continuously operated throughout the year. In the season when the indoor temperature is lower than the outdoor temperature, the conventional air conditioning system still needs to continue to operate the compression refrigeration system. The refrigeration system has low efficiency and is prone to accidents. Failure, when the indoor and o...

AI Technical Summary

Problems solved by technology

This system makes up for the deficiencies of the previous two systems in terms of utilizing the cooling capacity of outdoor low-temperature air and ensuring indoor air quality. However, if the two working modes of compression refrigeration and heat pipe circulation refrigeration are switched at a certain temperature point, can the cooling capacity of the system be stable? Connection and reliable work, etc., are worthy of consideration; at the same time, the upper limit temperature of the heat pipe circulation is too low, which is not conducive to maximizing the use of the cooling capacity of the low-temperature outdoor air

[0004] Invention patent CN01278831.7 discloses an energy-saving refrigeration cycle device with a circulation pump. The use of the circulation pump in the heat pipe cycle is conducive to improving the work efficiency of the heat pipe cycle, and also simplifies the installation of the heat pipe system. Requirements for the relative position of the evaporator, but CN01278831.7 is similar to CN201010528027.X in terms of maximizing the use of the cooling capacity of outdoor low-temperature air, that is, the upper limit temperature of the heat pipe cycle must be lower to smoothly connect with the refrigeration cycle

For high ambient temperature, two suction ports with different evaporating temperatures are used to realize the supercooling function, and no one has proposed an air conditioning system that ensures stable cooling output of the system under high ambient temperature conditions.

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