Operation Performance Calculation Method of Variable Refrigerant Flow System in Heat Recovery Mode Based on Built-in Sensors
In this paper,the calculation method for the operation performance of a variable refrigerant flow system under heat recovery mode is proposed. The calculation model for the refrigerant flow rate in the outdoor unit of the multi-split air conditioning system is established,considering theoretical refrigerant flow rate correction and return gas density correction,to obtain the refrigerant mass flow rate of the outdoor unit's main circuit. Then,based on the allocation of the opening value of the electronic expansion valve in the refrigeration unit and the allocation of the heat transfer capacity in the heating unit,the multi split capacity calculation models for the main refrigeration mode and main heating mode are determined. The results show that this method can effectively calculate the system's capacity output under different operating conditions,with heating and cooling capacity errors of 1％ and 9.5％ for the main heating mode at 24 ℃ and 7 ℃ respectively. The heating and cooling capacity errors of the main heating mode under the condition of 24 ℃ inside and-1 ℃ outside are 10.8％ and 14.8％,respectively. The heating and cooling capacity errors of the main cooling mode are 11.3％ and 0.5％ respectively with an internal temperature of 27 ℃ and an external temperature of 18 ℃.
万方数据
维普
