Abstract
In recent years, there are various utilization methods of solar thermal energy and it is hard to find which system is the best to utilize energy as work from the view point of energy concept alone. Therefore, we conducted exergy analysis of two different solar energy utilization methods: one is a multiple source & multiple use heat pump we have developed; and the other is a conventional solar water heater. In order to clarify the performance gap depending on the solar radiation between the multiple source & multiple use heat pump and the solar water heater, exergy analysis was carried out on a clear-sky day and a daily average under the condition of equal exergy output. The results show that the performance of the solar water heater highly depends on the weather conditions, on the other hand, the multiple source & multiple use heat pump shows high performance regardless of the weather conditions.
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