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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 refrigerant liquid, so it has an appropriate refrigerant velocity for heat transfer. In this way, subcooler requires smaller plate pitch than at the condenser. Figure 1: Heat Pump subcooler in series with condenser a) Scheme, b) P-h diagram. 2.2 Refrigerant cycle: Subcooling made in the condenser (SMC heat pump) Figure 2, shows the scheme of the water-to-water heat pump to make subcooling in the condenser. The evaporator, compressor, condenser and liquid receiver are the same than in the previous case, but for this case the subcooler was removed from the system. A throttling valve is located between the condenser and the liquid receiver, it introduces an active control of refrigerant charge in the system, and hence it can be used to set the subcooling at the condenser independently from the external conditions. In a system with a fixed area for heat exchange in the high pressure side, this feature allows the condenser to dedicate the optimum needed area for subcooling at each condition, while the SMS system has a fixed heat exchange area for subcooling. Liquid receivers are normally charge reservoirs used as passive elements to accommodate the changes in the active refrigerant charge due to changes in the operating mode or changes at the external conditions. In this case, the main functions will be to accommodate the changes in the active charge due to variations on the degree of subcooling at the condenser and to assure saturated liquid conditions at the outlet of the throttling valve. The pressure at the inlet of throttling valve (point 3) will depend on the heat transfer process at the condenser, and the pressure at the liquid receiver (point 4) will depend on the opening of the throttling valve. The liquid receiver ensures that the refrigerant leaves the throttling valve in liquid saturated state (point 4), which corresponds to the saturation temperature at the liquid receiver pressure. Therefore, since the throttling valve outlet is constrained to be on the saturation liquid line, the refrigerant stream at the condenser outlet (point 3) must be subcooled. The pressure drop at the throttling valve will determine the subcooling produced at the condenser: by increasing the pressure drop at the throttling valve, the refrigerant charge migrates from the liquid receiver to the condenser, which is flooded with refrigerant liquid and producing more subcooling. 4PDF Image | Comparative analysis of two subcritical heat pump boosters using subcooling
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