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M Pitarch-Mocholi, E Navarro-Peris, J Gonzalvez-Macia, JM Corberan / 12th IEA Heat Pump Conference (2017) O.1.9.3 Figure 5: % of area dedicated for subcooling as a function of subcooling and Tw,ci (SMCL and the fixed area for SMS) Figure 6 shows the heating COP and the condensing pressure as a function of subcooling and the condenser size (height). The inlet and outlet water temperature to the condenser are fixed at 30oC and 60oC respectively. For a constant condenser size, COP increases with subcooling up to a maximum value, the optimum subcooling is around 25 K for all condenser size. Condenser size has different effects depending on the degree of subcooling: 1) At low subcooling, COP slightly increases with condenser size. Beyond a certain size, the increase on performance is insignificant. 2) At the optimum subcooling, COP increases for the whole studied condenser size range. The degree of improvement is higher at smaller sizes. 3) At high subcooling, COP slightly increases at small condenser size, but after a certain point, condenser size has no effect on COP. Regarding to the condensing pressure, it decreases with condenser size for low and optimal subcooling, but at high subcooling the condensing pressure has no effect with condenser size. 9PDF Image | Comparative analysis of two subcritical heat pump boosters using subcooling
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