Low-temperature air-cooled water chiller unit and control method thereof

Abstract

The invention discloses a low-temperature air-cooled water chiller unit and a control method thereof. The low-temperature air-cooled water chiller unit comprises an electric cabinet for control operations of the unit, a compressor for compressing refrigerant, a condenser exchanging heat with the ambient temperature, a fan for accelerating heat dissipation of the condenser, an expansion valve for reducing the pressure of the refrigerant and throttling the refrigerant, and an evaporator for preparing chilled water. A pressure maintaining valve for rapidly establishing pressure difference is arranged between the outlet end of the compressor and the inlet end of the condenser, and a secondary oil separator is arranged between the inlet end of the pressure maintaining valve and the outlet end of the compressor. By means of the technical scheme above, the low-temperature air-cooled water chiller unit overcomes the problems that, at low temperatures, the unit cannot start, the compressor cannot rapidly establish the pressure difference and is difficult to return oil and the like; meanwhile, the low-temperature air-cooled water chiller unit can continuously perform refrigeration at a low temperature of minus 40 DEG C to provide sufficient circulating cooling water for nuclear power equipment and further ensure normal and safe operation of the nuclear power equipment.

Description

technical field [0001] The invention relates to the technical field of artificial refrigeration, in particular to an air-cooled chiller and a control method thereof. Background technique [0002] "Nuclear Power Safety Plan (2011-2020)" and "Nuclear Power Medium and Long-term Development Plan (2011-2020)" (discussed and implemented at the executive meeting of the State Council on October 24, 2012) have clearly pointed out that my country's "new nuclear power units must Comply with three generations of safety standards". The most important feature of the third-generation nuclear power technology is that the safety system adopts the "passive" design concept. [0003] Air-cooled chillers for the central chilled water system (VWS) of passive nuclear power plants are one of the core equipment of the air-conditioning system of nuclear power plants. The process equipment of the medium provides chilled water at 4.4°C. In the standard site parameters of passive nuclear power plants,...

AI Technical Summary

Problems solved by technology

[0004] In an extremely low temperature environment, there are problems such as failure to start, low pressure protection, and compressor failure

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