The present research is concerned with the study and experimental investigation of the effect of HFC refrigerant R134a on a vapour compression refrigeration system by using two expansion devises with the conservation of energy by waste heat recovery system. Here two different evaporators are used for air cooling and water chilling respectively and a water cooled condenser is used to produce hot water. The existing system can be easily retrofitted as a waste heat recovery device and the existing R22 refrigerant can be replaced by R134a with minor modifications. R134a play a vital role for the protection of global environment and maintain ecological balance, from the view point of energy conservation. The maximum temperature achieved in water tank with 50 litre of water is 45 C during 3 to 4 working hour. After that performance of system decreases so it needs a regular use of that hot water which can be used for household and industrial purposes.