Cascaded water chilling unit for dual purposes of intermediate temperature and low temperature

Abstract

The invention relates to a cascaded water chilling unit for dual purposes of intermediate temperature and low temperature. The cascaded water chilling unit comprises a high-temperature system, a low-temperature system and a control system. The high-temperature system is connected with the low-temperature system through an intermediate heat exchanger. The high-temperature system is composed of a high-temperature compressor, a high-temperature condenser and a high-temperature evaporator which are sequentially connected to form a loop. The intermediate heat exchanger is connected with the two ends of the high-temperature evaporator in parallel. The low-temperature system is composed of a low-temperature compressor, a low-temperature condenser, the intermediate heat exchanger and a low-temperature evaporator which are sequentially connected to form a loop. Throttling devices are installed at the liquid inlet end of the high-temperature evaporator and the high-temperature liquid inlet end of the intermediate heat exchanger respectively. The control system controls a liquid refrigerant in the high-temperature system to flow through the intermediate heat exchanger or the high-temperature evaporator by controlling switching-on or switching-off of the throttling devices. The water chilling unit can be used for producing high-temperature chilled water or low-temperature chilled water according to different conditions, energy is saved, environment friendliness is achieved, and operation is easy.

Description

technical field [0001] The invention relates to the technical field of cascade chillers, in particular to a dual-purpose cascade chiller for medium temperature and low temperature. Background technique [0002] Modern industry is advancing by leaps and bounds, and different production processes have different temperature requirements for chilled water. If you need to provide chilled water with a higher temperature, you need a single-stage chiller to freeze the refrigerant to make the chilled water reach the expected temperature. [0003] For example, the Chinese invention patent application with the application number of 201210240428.4 named "water chiller" discloses a chiller with a compressor, a suction pipe, a discharge pipe, and a liquid pipe arranged on one side of the heat exchanger. pipeline, liquid level gauge, and economizer, the compressor is connected to the evaporator through the suction section pipeline, the high temperature and high pressure gas port of the com...

AI Technical Summary

Problems solved by technology

However, the two systems in the cascade unit must be operated simultaneously, and the unit cannot produce medium-temperature and low-temperature chilled water according to different situations

[0005] Therefore, in actual production, in order to meet the requirements of different production processes, it is necessary to separately equip chillers with different temperature ranges. This is not only cumbersome to operate, but also occupies a large area, consumes a lot of energy, and has a high idle rate of equipment, which cannot meet the requirements of modern industrial efficiency. , energy saving and environmental protection production requirements

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