• we present an integrated approach for optimizing the multiple use in one refrigeration system. we have using this system for air conditioning and the second advantage of this system is also give chilled water. we model the mass and energy balance in various components of this system including evaporating condenser , reciprocating compressor, evaporating coil(split unit) , pump , tube and tube type water heat exchanger(economizer) etc. we have achieve approximately 15% power saving in this system. its capacity is 2 ton.