TY - JOUR
TI - Performance evaluation of heat pump system using R744/R161 mixture refrigerant
AU - Zhang Xian-Ping
AU - Wei Xin-Li
AU - Fan Xiao-Wei
AU - Ju Fu-Jun
AU - Yang Lei
JN - Thermal Science
PY - 2014
VL - 18
IS - 5
SP - 1673
EP - 1677
PT - Article
AB - As an efficient and energy conservation technology, heat pumps working with  R22, which are scheduled to be phased out by Montreal Protocol, are widely  used in China at present. The global deteriorating ecology environment would  accelerate the phase-out time of R22 in developing countries. Therefore, as a  matter of urgency, an eco-friendly substitute should be investigated in order  to replace R22. Under this context, and with a consideration of the  environmental protection, R744/R161 mixture refrigerant is proposed.  R744/R161 mixture refrigerant’s condensation pressure is reduced and its  flammability and explosivity are suppressed. A thermodynamic model is  developed, and under the given working conditions, the performances of  subcritical heat pump system using R744/R161 mixture of variable mass  fraction are discussed and compared with those of the R22 system. The optimal  mass fraction of R744/R161 is given, which corresponds to a maximal heating  coefficient of performance. The simulation results show that R744/R161  mixture can work as a competitive alternative to R22 in heat pump system.