Combined air conditioning system for machine room and control method thereof

Abstract

The invention discloses a combined air conditioning system for a machine room and a control method thereof. The system comprises a refrigerating system, a heat tube unit and a three-way valve, wherein the refrigerating unit comprises one or a plurality of compressors, a refrigerating condenser, a throttling device and a low-pressure liquid storing device; the heat tube unit comprises the low-pressure liquid storing device, an evaporator, a refrigerant pump and a heat tube condenser; the refrigerating unit and the heat tube unit are coupled through the low-pressure liquid storing device. The combined air conditioning system for the machine room is characterized in that the temperature of a refrigerant in the low-pressure liquid storing device can be controlled and treated as the precise control parameter of system cold output; the three-way valve can be controlled to switch to correspondingly perform refrigerating circulating, combined circulating and heat tube circulating according to the outdoor environmental temperature, so as to meet the refrigerating demands of the machine room and a base station on all-weather air conditioning; the natural cold sources from day to night, transition season and winter can be utilized to the maximum. The system is compact in structure design, high in reliability, energy-saving, environmentally-friendly, high in thermal efficiency, high in stability, and high in adjusting accuracy.

Description

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

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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