It
is well-known that air-cooled condensers having the same heat
transfer surface,but various geometries result in different system
performance.Therefore,optimization of the condenser coil configuration is required to enhance the energy efficiency of the system.In an air-cooled condenser the refrigerant enters the condenser and usually leaves as a sub-cooled liquid. Several studies have
shown that applying strategies to enhance the sub-cool tempera-ture can increase significantly the energy saving potential of HVAC systems. However,although increasing the sub-cool temperature using mechanical design can modify the system performance
and provide substantial savings,it results in extra upfront costs.Therefore, atrade-off approach should be considered between thermal and economical design of HVAC systems to achieve the optimal design scheme.On the other hand,HVAC systems are designed for full load conditions but more often than not,they operate at partial conditions. Therefore,an optimum thermo-economical design to improve the energy performance of the system at both full and partial conditions is necessary while keeping the system cost within an acceptable range.