EXPERIMENTAL ANALYSIS OF VCRS WITH TAPERED COIL CONDENSER USING HYDRO CARBON AS REFRIGERANT

Abstract

Generally the domestic VCRS system uses bare tube as condenser, but with this the heat transfer rate is not up to the optimum level.For achieving better heat transfer rates different shapes and geometry of tubes can be used.one of this is the coil condenser . A coil condenser is preferred in many applications due to its compact structure, larger heat transfer area and higher heat transfer capability. To make it more effective a tapered coil condenser is used. Several researches have also indicated that heat transfer rate in coiled tube are superior to straight tube due to complex flow pattern exist inside coil pipe. The concept behind compact heat exchanger is to decrease size and increase heat load which is the feature of coil heat exchanger. Though refrigerant R-134a is better in performance, it is an hydro fluoro carbon which has more global warming potential and ozone depletion potential. So, it is not fit for future use, therefore there is a need for alternative refrigerant. The alternative can be hydrocarbons (R600a-iso butane, R290 propane,R600-butane and mixture of R290&R600 etc.) In this research work a 180L capacity refrigerator equipped with tapered coil condenser working on hydro carbon is analysed. Finally it is observed that the COP of the tapered coil condenser coil refrigerator is more while comparing with the existing system. The performance parameters such as refrigerating effect, mass flow rate, compressor work and coefficient of performance are calculated. Finally the performances of both the existing system and proposed system are \ compared