Air conditioning system for defrosting by means of condensation waste heat and defrosting control method of air conditioning system

Abstract

The invention discloses an air conditioning system for defrosting by means of condensation waste heat and a defrosting control method of the air conditioning system. The air conditioning system comprises a multi-stage refrigeration cycle; evaporators of the multi-stage refrigeration cycle are sequentially arranged in an air supply pipeline; the multi-stage refrigeration cycle shares one condenser;a branch is connected to a water outlet pipeline of the condenser in parallel; a defrosting heat exchanger is connected to the branch; the defrosting heat exchanger is arranged at the front end of alast-stage evaporator; a defrosting valve is arranged on a water inlet pipeline of the defrosting heat exchanger; and a one-way valve is arranged on a water outlet pipeline of the defrosting heat exchanger. Condensed high-temperature waste water and the defrosting heat exchanger are fully used for defrosting the last-stage evaporator, operation of the whole machine is not affected in the defrosting period, and the fluctuation of the air supply temperature is small.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to an air conditioning system that utilizes condensed waste heat to defrost and a defrosting control method thereof. Background technique [0002] The aircraft ground air conditioning unit is mainly used to provide ventilated air with a certain flow, pressure and temperature to the aircraft in the ground shutdown state. It is an aircraft ground support equipment that meets the air conditioning supply requirements of the aircraft cabin staff and passengers after boarding. Because the aircraft requires outdoor fresh air, the fresh air temperature is as high as 35°C when the weather is hot, and the required supply air temperature is ≤2°C. In order to meet the supply air temperature requirements, the evaporation temperature of the evaporator is often as low as -2°C, or even at -2°C The following work, that is, requires a large enthalpy difference to supply air. Under this work...

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Problems solved by technology

[0008] The present invention proposes an air-conditioning system that utilizes condensed waste heat to defrost, so as to solve the problems of large temperature fluctuations, complex equipment and high operating costs in the defrosting stage in the prior art

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