An Energy and Exergy Efficiency Enhancement of Ice-on-coil storage Using Waste Heat
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Abstract
This research of energy efficiency and exergy efficiency of ice on coil storage system with waste heat recovery. The system consisted of 2 TR air conditioner with an ice storage volume 250 L that is well insulated. Inside the ice storage tank was installed with copper coil 15turns with inside diameter
9.5 mm. The system used R410A for heat exchange with the 210 L of water, initial temperature is 30˚C. The refrigerant from compressor flow through heat exchanger installed inside a waste heat tank 80 L and flow to the condenser. The experiment varied the electrical frequencies of the compressor to be 40, 45 and 50 Hz to relate with the waste heat at 70, 80 and 90˚C respectively. From a study of energy performance of system using ice storage at frequencies of 40, 45 and 50 Hz with waste heat recovery at 70, 80 and 90˚C, it found that at frequencies 40 Hz combined with the waste heat at 90˚C, the system had the highest coefficient and less electrical power when compare with the normal system is about 10.15%.Moreover the system varied the electrical frequency with the waste heat recovery is a nearly
the COP compare with the normal system without the waste heat is decrease when the time increase,
the exergy efficiency increase average about 8.0-18.0%, the energy efficiency of system average 89.0- 91.0%, the total electric energy saving 19.1%, and the best payback period is 2.11 years. It can therefore be applied to refrigeration and air conditioning systems in both industrial and residential sectors.
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