Air conditioning system unit and air conditioning system

Abstract

The invention provides an air conditioning system unit and an air conditioning system. The air conditioning system unit comprises a first sub-system and a second sub-system. The first sub-system comprises a first compressor, a first outdoor heat exchanger and a first indoor heat exchanger which are mutually connected to form the first compressing circulation, and a first economizer for supplying air and increasing enthalpy to the first compressor. The second sub-system comprises a second compressor, a second outdoor heat exchanger and a second indoor heat exchanger which are mutually connected to form the second compressing circulation, and a second economizer for supplying air and increasing enthalpy to the second compressor. The air conditioning system unit further comprises a first defrosting pipeline capable of optionally accessing the side road of the second economizer to the first compressing circulation so that a refrigerant of the first compressing circulation does not pass through the first indoor heat exchanger; and a second defrosting pipeline capable of optionally accessing the side road of the first economizer to the second compressing circulation so that a refrigerant of the second compressing circulation does not pass through the second indoor heat exchanger.

Description

technical field [0001] The invention relates to the field of air conditioning, in particular to an air conditioning system unit and an air conditioning system. Background technique [0002] As the cold and heat source of the central air-conditioning system, the air-cooled heat pump chiller and hot water unit has made great progress in recent years because of its convenient installation, simple operation, energy saving and easy modular integration, and its application range has been continuously expanded. At present, most of the ordinary air-cooled heat pump chiller and hot water units have a minimum ambient temperature of -15°C for heating operation. In order to broaden the operating range of air-cooled air-source heat pump heating, the technology of increasing enthalpy by air injection is often used. The air-cooled heat pump chiller and hot water unit that uses air injection to increase enthalpy can operate as low as -25°C to -30°C. [0003] Air-injected enthalpy-increasin...

AI Technical Summary

Problems solved by technology

[0003] Air-injection enthalpy-increasing air-cooled heat pump chiller and hot water units are prone to frost on the surface of the fins when the evaporating side fin heat exchanger exchanges heat with the air during heating in winter, which affects the heat transfer efficiency of the fins, thereby affecting the unit's capacity and reliability.

At present, the reverse cycle defrosting with four-way valve reversing is widely used, but the defrosting process needs to absorb heat from the water side. When defrosting, the heating stops, and continuous heating cannot be provided. The water temperature fluctuates greatly, which seriously affects the comfort of users.

Air-injected enthalpy-increasing air-cooled heat pump chiller and hot water unit has not yet solved the problem of continuous heating during defrosting

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