分析了非共沸制冷剂混合物（NARM）在水平管内冷凝的热力学特性。发现轴向蒸汽流的成分接近冷凝器下游区域更易挥发的成分。然后建立了水平管内NARMs冷凝的一维模型，其中假设了环形流型。分别给出了轴向蒸汽流和冷凝液流的能量和质量平衡以及传热传质方程。 液体冷凝液中的局部扩散通量对局部冷凝质量通量几乎没有影响。相反，汽液界面附近蒸汽侧较易挥发组分的局部反扩散通量与局部冷凝质量通量之比等于界面蒸汽和界面液体之间较易挥发组分的质量分数差。将传热和压降的模拟结果与实验数据进行了比较，得到了较好的一致性。 这些比较还验证了一个事实，即完全冷凝液体的过冷度将大于混合物的泡点与纯、更易挥发组分的沸点之间的温差。关键词:冷凝、热流、非共沸、制冷剂、混合物、热力学、特性、水平、管道、计算、流体流动、压降、比较、过冷、温差、性能规定: 研讨会，ASHRAE Trans。1994年，第100卷，第2部分

Thermodynamic characteristics of the condensation of nonazeotropic refrigerant mixtures (NARMs) in a horizontal tube are discussed analytically. The composition of the axial vapour flow is found to approach that of the more volatile component in the downstream region of the condenser. A one-dimensional model of the condensation of NARMs in a horizontal tube is then formulated in which an annular flow pattern is assumed. Energy and mass balances as well as heat and mass transfer equations are presented for the axial vapour flow and the condensate liquid flow, respectively. The local diffusion flux in the liquid condensate is found to have little effect on the local condensed mass flux. On the contrary, the ratio of the local counter-diffusion flux of the more volatile component on the vapour side near the vapour-liquid interface to the local condensed mass flux is found to equal the mass fraction difference of the more volatile component between the interfacial vapour and the interfacial liquid. Simulation results of heat transfer and pressure drop are compared with experimental data, and good agreement is obtained. The comparisons also validate the fact that the degree of subcooling of the completely condensed liquid will be greater than the temperature difference between the bubble point of the mixture and the boiling point of the pure, more volatile component.KEYWORDS: condensation, heat flow, non azeotropic, refrigerants, mixtures, thermodynamics, properties, horizontal, tubes, calculating, fluid flow, pressure drop, comparing, subcooling, temperature difference, performance