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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 the optimum and low subcooling. At Tw,ci=50oC, the condensing pressure at the optimum subcooling decreased below the corresponding experimental pressure for the SMS HP design. At lower Tw,ci (30oC and 10oC), the condensing pressure at the optimum subcooling is still higher than the corresponding experimental pressure for the SMS HP design. Table 3 shows the heating COP (COPh), the heating capacity (Qh), the heat corresponding to the subcooling (Qsub), the heat corresponding to condensing + desuperheat (Qcond), and the compressor consumption. These parameters are shown for the SMS HP prototype (experimental) and the results for the SMCL model (height of 0.59 m) working at the optimum subcooling. The heating capacity is slightly higher at the SMCL model, while the compressor consumption depends on the point. Figure 4: Results for two condenser height. a) Heating COP, b) Condensing pressure Table 3: Experimental SMS and SMCL model comparison at the optimum subcooling Tw,ci=10oC Tw,ci=30oC Tw,ci=50oC Qh Qsub [kW] [kW] 5.66 45.72 12.07 4.82 40.07 7.30 4.00 35.95 3.26 Qcond Wc COPh [kW] [kW] Model 33.65 8.08 5.58 32.77 8.31 4.91 32.68 8.98 4.11 Qsub,SMCL [kW] 46.15 12.47 41.76 8.03 36.53 3.15 Qcond,SMCL [kW] [kW] 33.68 8.26 33.73 8.52 33.38 8.89 COPh WcSMCL Qh,SMCL [kW] Figure 5 shows the condenser area dedicated for subcooling as inlet temperatures to the condenser (Tw,ci) for the SMCL and subcooling depends strongly on the Tw,ci. For instance, the dedicated area to produce 15 K of subcooling goes from 5% to 65% for Tw,ci=10oC and Tw,ci=50oC respectively. When the system works at the optimal subcooling the dedicated area to subcool is lower as Tw,ci increases, for instance, the dedicated area at the optimum subcooling for Tw,ci=10oC is 47%, while it is 24% when Tw,ci=50oC. Therefore, the heat exchange area dedicated to produce subcooling at the optimum point will change depending on external parameters, such as Tw,ci. This might be one of the reasons in order to explain the performance of SMCL compared with the SMS system, which improves at higher Tw,ci. It is observed that for all the cases the area dedicated for subcooling in the SMS system is lower than in the SMCL system. This is probably derived from the fact that the subcooler of the SMS system was designed to only subcool the refrigerant, and the plate pitch of that heat exchanger is thinner than for the SMCL, this fact allows a higher heat transfer coefficient and hence lower heat transfer area for this part of the cycle. 8 a function of subcooling for different water the fixed area for the SMS. The area forPDF Image | Comparative analysis of two subcritical heat pump boosters using subcooling
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