Efficient and stable magnetic suspension water chilling unit and control method and device

Abstract

The invention discloses an efficient and stable magnetic suspension water chilling unit and a control method and device. The water chilling unit can effectively increase the supercooling degree of a refrigerant in a mode of taking liquid later, thereby reducing the flash evaporation of the refrigerant, and improving the energy efficiency ratio of the whole water chilling unit. According to the control method, load calculation is carried out based on the actual water outlet temperature, and target temperature of water is set; by comparing the actual water outlet temperature with the target temperature, and combining the difference between the actual water outlet temperature and the target temperature with the starting temperature difference or the stopping temperature difference, the working state of a compressor of the water chilling unit is adjusted to make the working states of the water chilling unit divided into four working states of loading the corresponding load in each period,increasing the starting number of the compressors, unloading the corresponding load in each period and reducing the starting number of the compressors, so that the control precision of the water chilling unit is improved, the starting and stopping frequency of the compressor is reduced, and the operation of the system is more stable and reliable.

Description

technical field [0001] The invention relates to the field of air-conditioning and refrigeration devices and their control, in particular to an efficient and stable magnetic levitation chiller, a control method and a device. Background technique [0002] The magnetic levitation chiller has the advantages of energy saving and high efficiency, low operating noise and vibration, high efficiency and no friction loss, low starting current, low daily maintenance costs, green environmental protection and high system sustainability, and has become an important role in central air conditioning. [0003] Existing maglev chillers generally use the inlet temperature or outlet temperature of chilled water as a reference temperature to adjust the operating status of each component to achieve the required current temperature. [0004] If the chiller adjusts the operating state of each component of the chiller with the goal of keeping the chilled water outlet temperature constant within the ...

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Problems solved by technology

[0006] In view of the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a highly efficient and stable magnetic levitation c

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