*Refrigerant Mixtures DOI: http://dx.doi.org/10.5772/intechopen.99024*

refrigerant charge in the system. The performance of propane is comparable to CFC-12 and HCFC-22 and considered to be better than HFC-134a. Granryd et al. designed a heat pump prototype with propane as refrigerant as an alternative to HCFC-22. Use of HFC 134 (a) will be decomposed as acids and poisonous substances, which is worse than the use of CFC. So use of natural refrigerants like hydro carbons was suggested by Lorentzen [6].
