Modeling and experimental validation of a solar-assisted direct expansion Air Conditioning System

Publication Type:
Journal Article
Energy And Buildings, 2013, 66 (1), pp. 524 - 536
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Continuous increase in global electricity consumption, environmental hazards of pollution and deple-tion of fossil fuel resources have brought about a paradigm shift in the development of eco-friendly andenergy-efficient technologies. This paper reports on an experimental study to investigate the inherentoperational characteristics of a new direct-expansion air conditioning system combined with a vacuumsolar collector. Mathematical models of the system components are firstly derived and then validatedagainst experimental results. To investigate the potential of energy savings, the hybrid solar-assistedair-conditioner is installed and extensively equipped with a number of sensors and instrumentationdevices, for experimentation and data collection. The influence on the system energy usage of the aver-age water temperature, storage tank size and room set-point temperature are then analyzed. Once theair-conditioned room has achieved its desired temperature, the compressor turns off while the cool-ing process still continues until the refrigerant pressure no longer maintains the desired temperature.The advantages of the proposed hybrid system rest with the fact that the compressor can remain off in alonger period by heat impartation into the refrigerant via the water storage tank. Results show an averagemonthly energy saving of about between 25% and 42%.
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