A control method of a three-pipe heat recovery air-conditioning system and the air-conditioning system

Abstract

The invention relates to a control method of a three-pipe heat recovery air-conditioning system and an air-conditioning system, comprising the following steps: Step 1, real-time detection of the inlet water temperature T1 and outlet water temperature T2 of the water heat exchanger; Step 2, comparing T1 and T2 with the set Compared with the fixed first low temperature t1, when the inlet water temperature T1 or outlet water temperature T2 is less than or equal to the first low temperature t1, the air conditioning system will start heating to heat the water in the water heat exchanger; When the water temperature T1 or the outlet water temperature T2 reaches the set high temperature t2, the heating of the air-conditioning system is turned off, and the air-conditioning system returns to the previous standby state. The invention can effectively prevent the water in the water heat exchanger of the heat recovery device from freezing under the condition of low temperature, which affects the operating reliability of the system.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a control method for a three-pipe heat recovery air conditioning system and an air conditioning system. Background technique [0002] At present, in order to improve the comfort of air conditioners, there may be different demands for cooling and heating in transitional seasons. For a single set of multi-connected air conditioning system, it must be able to meet the cooling and heating demands at the same time. In the prior art, three The controlled multi-connected air-conditioning system can meet this demand, and multiple indoor units can simultaneously turn on two different modes of cooling or heating. [0003] In the repeated refrigeration cycle of the air conditioner, the refrigerant will generate a lot of heat. If this part of the heat is fully utilized, it will have great significance in the field of energy saving in daily life. The existing practice is to add a he...

AI Technical Summary

Problems solved by technology

The existing practice is to add a heat recovery device to the three-pipe multi-connected air-conditioning system, and use the waste heat of the air conditioner to make hot water. At present, the water heat exchangers used in the heat recovery device are mostly plate heat exchangers and casing heat exchangers. However, in some cold areas in the north, when the ambient temperature is lower than 0 degrees, the residual water in the water heat exchanger may freeze, block the pipeline, and affect the reliability of the system operation at the next startup

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