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ABSTRACT
The performance of an existing 5 ton (17.7 kW)
air conditioning system with an EER of 8 has been
simulated by retrofitting it with a two-phase natural
circulation heat recovery loop and an evaporatively cooled
condenser. The author has developed a simulation program
for predicting the performance of existing air conditioning
systems with one or both of the above retrofits for the
performance enhancement. The performance of the air
conditioning system is simulated for hot and humid climates
which are typical of Southeastern United States. The
performance data along with an economic analysis has been
presented in the paper.
This investigation shows that by retrofitting an
existing 5 ton air conditioning system with a two-phase
natural circulation heat recovery loop and an evaporatively
cooled condenser, the operational cost and the peak demand
are reduced. Hence, there is a cost impact from both

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