Exergy Assessment of a Direct Expansion Solar-Assisted Heat Pump Working with R22 and R407C/LPG Mixture

This study presents the exergy assessment of a direct expansion solar-assisted heat pump (DXSAHP) working with R22 and R407C/LPG mixture (in the ratio of 70:30 by mass) as an alternative. The experiments were conducted in a DXSAHP under the meteorological conditions of Calicut, India. Artificial neural networks model was developed to assess the exergy performance of a DXSAHP working with R22 and RM30 at different ambient conditions (ambient temperature and solar intensity). The performance of a DXSAHP (working with R22 and R407C/LPG) was compared in terms of exergy efficiency and exergy destruction of each component and of the whole system at different ambient conditions. The results showed that overall exergy performance of a DXSAHP working with RM30 was found to be slightly lower than that with R22 across the wide range of ambient conditions. However, R407C/LPG is a good ozone-friendly alternative to phase out R22 in DXSAHP applications.

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