Indian Journal of Science and Technology

Abstract

Heat pumps are the most promising technologies to reduce global warming emissions and to more rationally use energy. In this experimental investigation Carbon Dioxide (CO2 )was used as refrigerant which is available in nature, eco friendly, economical, non toxic, non flammable and non corrosive. It is The performance evaluation of prototype vapor compression heat pump model was performed and evaluated the different parameters such as LMTD (Logarithmic Mean Temperature Difference), COP (Co-efficient of Performance) and heat transfer rate of condenser. This experiment is carried out by varying water mass flow rate, pressure and evaporator fan speed for two condensers of different dimensional specification. The water in the shell side was heated by absorbing heat from refrigerants in the tube side of condensers by counter flow heat exchanging method. The experimental results indicate fairly good COP with the use of CO2 . The advantages of CO2 as refrigerant with zero ODP and minimum GWP. 

Keywords: COP, Evaporator, Heat pump, LMTD, Ozone Depletion Potential