Heat recovery system, control method and air conditioning unit

Abstract

The invention provides a heat recovery system, a control method and an air conditioning unit. The heat recovery system comprises a heat recoverer, a hot water pipe is arranged in the heat recoverer, the hot water pipe is provided with a hot water outlet pipe and a hot water return pipe, a second bypass pipe is arranged between the hot water outlet pipe and the hot water return pipe, a second control valve is arranged on the second bypass pipe, the flow of the second bypass pipe and the water supply temperature of the hot water outlet pipe are adjusted through the second control valve, and the water supply temperature is in direct proportion to the opening degree of the second control valve. According to the heat recovery system, the bypass pipe is additionally arranged between the hot water outlet pipe and the hot water return pipe of the heat recoverer, part of hot water is guided into the heat recoverer again through the bypass pipe, and hot water exchanges heat with the gas refrigerant again, so that the effect of increasing the water supply temperature is achieved; when the opening of the control valve is greater, the water quantity participating in secondary heat exchange is larger, so that the water supply temperature is higher.

Description

technical field [0001] The disclosure belongs to the technical field of air conditioning, and in particular relates to a heat recovery system, a control method and an air conditioning unit. Background technique [0002] When using a refrigerant with low exhaust superheat and low sensible heat (for example: R134a) for partial heat recovery design, the water temperature of partial heat recovery is greatly affected by the condensation temperature, and the temperature of hot water supply is low, which cannot meet the heat recovery temperature requirements. Contents of the invention [0003] Therefore, the technical problem to be solved in the present disclosure is that the temperature of part of the heat recovery water is greatly affected by the condensation temperature, and the temperature of the hot water supply is low, which cannot meet the requirement of the heat recovery temperature. [0004] In order to solve the above problems, the present disclosure provides a heat rec...

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Problems solved by technology

[0003] Therefore, the technical problem to be solved in this disclosure is that part of the heat recovery water temperature is greatly affected by the condensation temperature, and the hot water supply temperature is low, which cannot meet the heat recovery temperature requirements

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