Control method of multimode machine room air conditioning system

Abstract

The invention discloses a control method of a multimode machine room air conditioning system. Outdoor temperatures fall into three different functional zones, and a cold source system is correspondingly switched to run in a refrigeration cycle mode, a gas pump cycle mode and a natural cycle mode according to the functional zone into which the outdoor temperature falls. According to the control method, the running states of a compressor, an air pump, a throttling device and a condenser can be adjusted according to the outdoor temperature and an indoor load, an outdoor natural cold source is employed in a low-temperature season by replacing a compression refrigerating cycle with the gas pump cycle mode and the natural cycle mode, the unit cost of an existing compound-type air conditioning system is lowered, the system structure is simplified, and the maintenance difficulty is lowered; in addition, running energy consumption is lowered substantially by effectively employing outdoor natural cold sources at day and night, in transition seasons and in winter, and the control method has the excellent effects of energy conservation and emission reduction.

Description

technical field [0001] The invention relates to a control method of a multi-mode computer 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 run continuously 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, and the refrigeration system has low working efficiency and It is prone to failure. If the temperature difference between indoor and outdoor can be used to transport ...

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] The utility model patent CN01278831.7 discloses an energy-saving refrigeration cycle device with a circulation pump. The use of the circulation pump in the heat pipe circulation system is conducive to improving the work efficiency of the heat pipe circulation, and also simplifies the installation of the circulation system for the condenser and liquid storage. However, the deficiency of the patent CN01278831.7 in maximizing the use of the cooling capacity of the outdoor low-temperature air is similar to that of 201010528027.X, that is, the upper limit temperature of the heat pipe circulation must be low to smoothly connect with the refrigeration cycle

[0005] Chinese invention patent application 201710818872.2 discloses a compound year-round cooling system with switchable working modes. The system includes an air pump, a compressor and multiple switching valves. Although it can realize separate circulation mode, air pump circulation mode and mechanical refrigeration mode, However, there are too many switching valves in the system, which greatly increases the product cost and increases the difficulty of control, and does not provide multiple mode switching control methods

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