Three-tube heating recycling air-conditioning system control method and air-conditioning system

Abstract

The invention relates to a three-tube heating recycling air-conditioning system control method and an air-conditioning system. The three-tube heating recycling air-conditioning system control method includes the following steps that step 1, the inlet water temperature T1 and the outlet water temperature T2 of a water heat exchanger are detected in real time; step 2, the T1 and the T2 are compared with a set first low temperature t1, when the inlet water temperature T1 or the outlet water temperature T2 is smaller than or equal to the first low temperature t1, air-conditioning system heating is stated, and water in the water heat exchanger is heated; step 3, when it is detected the inlet water temperature T1 or the outlet water temperature T2 reaches the set high temperature t2, air-conditioning system heating is ended, and the air-conditioning system restores to the previous standby state. By means of the three-tube heating recycling air-conditioning system control method and the air-conditioning system, the situation that water in the water heat exchanger of a heat recycling device is frozen under the low temperature, and thus system operation reliability is affected can be effectively prevented.

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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