c)两者制热系数都随冷凝器进水温度的升高而减小，但定比例混合工质系统的制热系数始终高于同工况下纯质系统。

　　从以上结论可知：在相同热泵装置中采用混合工质的制热量比采用纯质的要低，但由于其耗功量比同工况的纯质要小，其系统制热系数比同工况的纯质要高，显示了混合工质替代纯质的节能优势，可以作为R22的替代制冷剂。

　　5.致谢

　　感谢上海交通大学的丁国良教授给与本文的悉心指导。

　　参考文献

　　[1] S. Devotta, A. V. Waghmare, N. N. Sawant, B. M. Domkundwar, Alternatives to HCFC-22 for air conditions, Applied Thermal Engineering, 21(6): 703~715, 2001

　　[2] 丁国良，张春路，制冷空调装置仿真与优化，北京：科学出版社，2001

　　[3] 陈光明,尹执中，用改进的PT方程计算低温流体混合物的汽液平衡，低温物理学报，18(5):381-387,1996

　　[4] 王勤,混合工质节流制冷机的理论与实验研究，浙江大学博士论文，2002

　　[5] Cecilia Gabrielii，Lennart Vamling. Drop-in replacement of R22 in heat pumps used for district heating－influence of equipment and property limitations. International Journal of Refrigeration, 24(7) : 660-675,2001

　　[6]吴业正，制冷原理及设备，西安：西安交通大学出版社，1996

　　[7] 齐铭，制冷附件，北京：航空工业出版社，1992

　　[8]刘利华，空气源热泵变浓度容量调节的理论与实验研究，浙江大学硕士论文，2003

　　Steady-state simulation and performance comparison for an air source heat pump system

　　Liu Lihua¹, Chen Guangming², Hong Feng², Li Yangchun²,

　　1.Zhejiang Institute of Science and Technology, 310023, Institute of Refrigeration and Cryogenic Engineering of Zhejiang University, 310027

　　Abstract：This article proposes out a steady-state simulation model of a general air source heat pump system, calculates system performances of using R22 and R32/R134a(30/70wt%) as refrigerants respectively, and gets performance curve as the working condition changes. Compared with the system of R22 at the same working condition, it is indicated that heating capacity and work consumption of the system of R32/R134a are inferior to that of the former, but its heating COP is higher than the former at the lower temperature climate. Therefore, it shows that mixture replacing pure substance has advantage of energy savings and provides a theory basis for further research.

　　Keywords ：Air source heat pump; Steady-state simulation; Performance comparison

　　作者简介：刘利华，女，1975年10月出生，学历硕士，学位工学硕士。职称助教。详细联系地址：浙江省杭州市古敦路星州花园万黛兰居3-1-101，邮编310012。单位名称：浙江工程学院（原丝绸工学院），英文名称为：Zhejiang Institute of Science and Technology.

　　-联系电话0571-88489722 或 0571-88495233, MP 13588029189邮箱llh.zju@263.net 或 llh_zju@hotmail.com

　　注：原“浙江工程学院”现在更名为“浙江理工大学”，英文名称为Zhejiang University of Science