Secondary circulation type evaporation-condensation natural cooling water chiller and control method thereof

Abstract

The invention relates to the technical field of refrigeration, and discloses a secondary circulation type evaporation-condensation natural cooling water chiller. The secondary circulation type evaporation-condensation natural cooling water chiller comprises a mechanical refrigeration system which is composed of a compressor, a condenser, a flow controller and an evaporator. The secondary circulation type evaporation-condensation natural cooling water chiller further comprises an inner circulation system used for conducting heat exchange with the evaporator and a secondary circulation system used for conducting heat exchange with the inner circulation system through a liquid-liquid heat exchanger. The inner circulation system is provided with a natural cooling system capable of controlling the flowing direction of refrigerant in the inner circulation system so as to conduct heat exchange with the refrigerant. The mechanical refrigeration system, the inner circulation system, the natural cooling system and the secondary circulation system are electrically connected with a controller, and the controller controls all the systems to operate. By means of the secondary circulation type evaporation-condensation natural cooling water chiller, the mechanical refrigeration system, the inner circulation system, the secondary circulation system and the natural cooling system achieve five regulation and control methods and are suitable for meeting the refrigeration needs in different temperature environments, the free cooling capacity can be obtained through the natural cooling system when the outdoor environment temperature is low, usage of the mechanical refrigeration system can be reduced and even stopped completely, and the energy-saving effect is obvious.

Description

technical field [0001] The present application relates to the technical field of refrigeration, in particular to a secondary cycle evaporative condensation natural cooling water chiller and a control method thereof. Background technique [0002] In current communication equipment rooms, especially large data centers, air-cooled chillers are generally used as cold sources to provide chilled water for the indoor terminals of the air-conditioning equipment in the communication equipment room, thereby cooling down the indoor environment of the communication equipment room. Since the communication equipment in the communication room is basically in a state of uninterrupted operation throughout the year, and the heat generation is very large, therefore, the air-cooled chiller used in the communication room generally needs to be refrigerated throughout the year, and the energy consumption is large. The energy efficiency ratio is low. [0003] Moreover, since the air-cooled chiller...

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Problems solved by technology

However, in the northern region, since the lowest temperature at night in winter is -20~-30°C, and the temperature is even lower in extreme weather, the water cooling method is adopted, and antifreeze measures must be considered for the cooling tower, and the antifreeze effect is general, which is not ideal. It is necessary to add high-concentration antifreeze to the circulating water of the cooling tower and the pipeline, which not only increases the investment but also corrodes the pipeline and equipment

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