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In this paper, the exergy performance of direct-expansion solar-assisted heat pump systems working with R22 and R433A (mixture of R290 and R1270, 70:30 by mass) was experimentally assessed. The experiments were carried out under the metrological conditions of Calicut in India. (Longitude and latitude of location are $$75.78 ^{\circ }\hbox {E}$$ 75.78∘E and $$11.25^{\circ }\hbox {N}$$ 11.25∘N , respectively...
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