The proposed system consists of two air conditioning sub systems. The first is a water cooling heat
exchanger system which works as an air pre-cooler for the conventional mechanical vapor compression
refrigeration system (VCR). The proposed system is using (R-22) as a refrigerant which is investigated for warm
and hot climates. The results indicate that by using indirect heat exchanger system can reduce cooling load from
6% to 40% during cooling season and also from 10 % to 16 % reduction in electrical energy consumption for
the used unit 2.02 hp along the test rig running. Moreover the heat recovery system and its open cooling water
cycle on the water cooled condenser save a hot water temperatures ranged from (30 oC – 35 oC) available for
using continuously as the VCR system running. From the other side, the water cooled condenser removes back
pressure on the compressor better than air cooled condenser, which will increase compressor operation life.
Improve the performance of the refrigeration unit by combined a pre- cooling system to remove a part from the
sensible in the outdoor air and this will occur by studying the work experimental and theoretical. Its
experimental relevance studies the performance of the new system through calculating the cooling capacities of
the new system. The theoretical expectation of the performance of the new system by changing parameters the
same in experimental plus other parameters done in theoretical model only such as water heat exchanger cooling
water temperature and flow rate, and water heat exchanger effectiveness.