• Syed Saami Rizvi
• D.C Vishwakarma,
• Vivek Khare

A refrigerant is a vital fluid that is used in cooling mechanism which acts as a heat carrier by undergoing phase changes from gas to liquid and back to gas in the refrigeration cycle. Earlier, Chlorofluorocarbons (CFCs) and hydro chlorofluorocarbons (HCFCs) dominated the industrial and domestic refrigeration sector. CFCs and HCFCs are referred as ozone depleting substances (ODS) since the presence of chlorine make them non- bio degradable by natural agents and last very long in the atmosphere after their release and once these gases reach the stratosphere, results in thinning of ozone layer. The mandate of Montreal Protocol approved by the United Nation’s Environmental Protection Agency (UNEP) enforces the phase out of all ozone depleting substances in developing countries by 2030 and Kyoto Protocol emphasizes the reduction in emission of green house gases including refrigerants like CFCs and HCFCs. The wide spread of environmental concerns like ozone depletion potential (ODP) and global warming issues are posing a challenge to the refrigeration and associated industries A detailed experimentation was carried out in a vapour compression test rig to compare the performance and effectiveness of the system based on the following parameters: i) Evaporator Load (Qe), ii) Condenser Load (Qc), iii) Work done by Compressor (Wc), Refrigeration Effect (R.E), iv) Coefficient of Performance (COP) and v) Effectiveness () of the system. The experimental results showed that R600a (Isobutane) a hydrocarbon performed better than R12 (CFC), and R152a (Difluoroethane) in terms of COP and energy consumption. The comparison between the four refrigerants selected for the study revealed that hydrocarbon refrigerant R600a (Isobutane) recorded the lowest temperature of -3.70C in the chiller for the capillary diameter of 0.044‖ (1.18 mm). Moreover, the energy consumption by hydrocarbon R600a was 8% and 30% less for capillary diameters 0.044‖ and 0.050‖. Than R12. Based on their environmental benefits hydrocarbon refrigerant R600a is selected as a suitable eco friendly alternate refrigerant which is cost effective, energy efficient and safe to the environment.

ClF2CCF2Cl, HC mixture, Coefficient of Performance, C2H4F2, GWP

"Effect of different capillary tube diameters on the performance of VCR system", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 4, page no.429-435, April-2019, Available :http://www.jetir.org/papers/JETIR1904N59.pdf

"Effect of different capillary tube diameters on the performance of VCR system", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 4, page no. pp429-435, April-2019, Available at : http://www.jetir.org/papers/JETIR1904N59.pdf