Evaporative cooling type direct expansion unit and control method thereof

Abstract

The invention provides an evaporative cooling type direct expansion unit and a control method thereof. The evaporative cooling type direct expansion unit comprises a compressor, a condenser, a throttling device and an evaporator, the compressor, the condenser, the throttling device and the evaporator are sequentially connected to form a refrigerant refrigeration cycle, and the compressor is an airsuspension compressor. According to the evaporative cooling type direct expansion unit and the control method thereof, on one hand, the air suspension compressor is adopted, so that a corresponding cooling lubricating oil path does not need to be designed for the air suspension compressor, the system design of the unit is simpler, and adverse effects caused by over-high or over-low oil level in the system adopting the cooling lubricating oil path are effectively avoided; and on the other hand, space refrigeration is achieved through refrigerant direct expansion of the evaporator, a conventional cold water main machine and a tail end type in the prior art are not needed, the heat exchange efficiency of a unit system can be improved, the unit structure is more compact, and the occupied areais smaller.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to an evaporative cooling direct expansion unit and a control method thereof. Background technique [0002] Conventional water-cooled chillers use cooling towers and cooling pipelines to provide cooling water for the air conditioning system. The heat exchange efficiency of the system is low and the equipment is complicated. Conventional chillers usually use magnetic levitation centrifugal compressors, conventional centrifugal compressors, screw compressors or scroll compressors. Magnetic levitation compressors do not need to be equipped with lubricating oil, but they need to be equipped with electromagnetic bearings, position sensors, backup bearings and a series of At the same time, there are a series of problems in the maglev compressor in terms of post-maintenance, power loss, electrical failure and other issues. Other compressors need to be equipped with lu...

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Problems solved by technology

[0003] Therefore, the present invention provides an evaporative cooling direct expansion unit and its control method, which can overcome the shortcomings of conventional water-cooled chillers in the prior art that require oil circuit lubrication, etc., resulting in complex oil circuits and high operation and maintenance costs

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