Twin screw type water source heat pump unit

Abstract

The invention discloses a twin screw type water source heat pump unit, which comprises compressors, motors, an oil separator, an oil cooler, a condenser, an evaporator and an expansion valve, wherein the condenser is a lamella heat exchanger, and the evaporator is a plate heat exchanger; a water source pipeline is arranged on the oil cooler, and a water source heat exchange pipeline is arranged in the lamella heat exchanger; an outlet of the water source pipeline is connected with an inlet of the water source heat exchange pipeline for in and out circulation of a water source, and a secondary refrigerant heat exchange pipeline is arranged in the plate evaporator; an inlet and an outlet of the secondary refrigerant heat exchange pipeline are used for in and out circulation of the secondary refrigerant. The plate heat exchangers have high heat transfer coefficient, small occupied areas and flexible application; two screw compressors with the same energy level are connected in parallel, share the same oil way system, and can be separately maintained on line, and the energy levels of the compressors can be automatically equalized. Ammonia is used as a refrigerant, and the filled amount of ammonia in the plate heat exchangers is small, so that the harmfulness is low, and safety and environmental protection are realized.

Description

Technical field [0001] The invention relates to a water source heat pump unit, in particular to a water source twin-screw heat pump unit with high refrigeration efficiency and stable refrigeration efficiency, belonging to the technical field of refrigeration. Background technique [0002] With the development of refrigeration technology and its wide application, open-type screw refrigeration compressors, especially open-type twin-screw refrigeration compressors, due to their simple structure, few parts, easy use and maintenance, small size, small footprint, etc. The advantages of this aspect are increasingly common applications, especially in some occasions that require large cooling capacity. [0003] The existing water source heat pump units mostly use a single compressor. If the compressor fails or the compressor load fails to automatically reduce the load, the entire refrigeration system will be paralyzed. If online maintenance or timely manual adjustment is not possible, it wi...

AI Technical Summary

Problems solved by technology

[0003] Most of the existing water source heat pump units use a single compressor. If the compressor fails, or the compressor load cannot be automatically unloaded and adjusted, the entire refrigeration system will be paralyzed. If online maintenance or manual adjustment cannot be performed in time, the Affect cooling efficiency

In addition, the condenser and evaporator in the existing water source heat pump unit mostly use shell-and-tube heat exchangers. Although the structural strength is good, the heat transfer coefficient is not ideal and the heat exchange efficiency is low. The maintenance site of the tube bundle has a large structure, resulting in an uncompact design of the unit

In addition, the refrigerant R134a (tetrafluoroethane) is mainly used at home and abroad as an environmentally friendly substitute for R12 (Freon 12), but because it can produce a greenhouse effect, that is, the GWP (global warming coefficient value) is too high, it will eventually face disuse

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