For residential heat pumps, R32 becomes one of the most widely used refrigerant, thanks to an environmental impact much lower than R410A. However, with a classic suction superheat control, R32 induces higher discharge temperatures. Two-phase suction is thus generally allowed in rotary compressors to lower the discharge temperature. In theory, this process can also improve the heat pump performances. However, using two-phase suction for real-time performance optimization implies to identify and control the suction vapour quality. In this study, an iterative method using the compressor energy balance and the compressor efficiencies is presented to determine the suction vapour quality and refrigerant mass flow rate without using a flowmeter. An R32 air-to-air heat pump is then experimentally tested. The reference values are indirectly measured through the mass flow rate measurement and the compressor energy balance. A correlation is thus presented, giving the vapour quality from the operating parameters. If the volumetric or global compressor efficiencies are known, the proposed iterative method allows to calculate the vapour quality with a 0.4 % accuracy. Moreover, this method gives the refrigerant mass flow rate and heating capacity with a 1 % accuracy. The sensitivity of the method is evaluated considering a 10 % error on the volumetric or global efficiency values. In this case, the suction vapour quality values are kept within 2.5 % of the reference measurement. In addition of allowing a precise control of two-phase suction, this method can also make the in-situ performance measurement of these heat pumps possible.

对于住宅热泵，由于对环境的影响远低于 R410A，R32 成为使用最广泛的制冷剂之一。然而，通过经典的吸入过热控制，R32 会导致更高的排放温度。因此在旋转式压缩机中通常允许两相吸入以降低排放温度。理论上，这个过程也可以提高热泵性能。然而，使用两相吸入进行实时性能优化意味着识别和控制吸入蒸汽质量。在这项研究中，提出了一种使用压缩机能量平衡和压缩机效率的迭代方法来确定吸入蒸汽质量和制冷剂质量流量，而无需使用流量计。然后对 R32 空气对空气热泵进行实验测试。参考值是通过质量流量测量和压缩机能量平衡间接测量的。因此呈现出相关性，从操作参数给出蒸汽质量。如果容积或全局压缩机效率已知，则建议的迭代方法允许以 0.4% 的精度计算蒸汽质量。此外，该方法以 1% 的精度给出了制冷剂质量流量和加热能力。考虑到体积效率值或全局效率值的 10% 误差来评估该方法的灵敏度。在这种情况下，吸入蒸汽质量值保持在参考测量值的 2.5% 以内。除了允许精确控制两相吸入之外，该方法还可以使这些热泵的原位性能测量成为可能。