【摘要】 本文提出了热回收模式的多联机能力计算方法，建立了多联机外机制冷剂流量计算模型，考虑了理论制冷剂流量修正和回气密度修正，得到外机主回路的制冷剂质量流量。然后，基于制冷内机电子膨胀阀开度值分配和制热内机换热能力分配，确定了主制冷模式和主制热模式下的多联机能力计算模型。随后选取了一台一拖四的多联机，进行了不同工况下多联机主制冷模式、主制热模式的制冷、制热能力实验验证研究。结果表明：该方法在不同工况下均可有效计算系统的能力输出，内24℃外7℃工况下主制热模式制热、制冷能力误差为1%、9.5%；内24℃外-1℃工况下主制热模式制热、制冷能力误差为10.8%、14.8%；内27℃外18℃主制冷模式下为11.3%、0.5%。更多还原

【Abstract】 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 ℃.更多还原