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Sylvain Quoilin Chapter 4 : Description of the experiments Figure 37: Error in the pump flow rate vs subcooling A possible explanation for this phenomenon is the condenser asymmetry : the two heat exchangers composing the condenser are installed in parallel on the refrigerant side but in series on the water side. The consequence is a higher water temperature in one of the condenser (about 3 °C) and hence a reduced heat exchange. It is thus possible that one of the heat exchanger condenses the fluid and even subcools it, while the other one is not capable of completing the condensation. When the two flows are mixed at the exhaust of the condenser, it can occur the paradoxical situation in which a twophase state remains in the subcooled fluid, the vapor not having time to be condensed before entering the pump. 4.4.4 Refrigerant charge and subcooling. In Rankine cycles, it is generally assumed that the refrigerant charge imposes the subcooling : the liquid occupying more space in the condenser and in the evaporator, it has a higher exchange surface to be subcooled. Figure 38 shows the subcooling at the condenser exhaust as a function of the refrigerant charge. The subcooling is calculated by two different methods : – The traditional way, with the saturation temperature defined at the exhaust pressure of the condenser – A second possibility is to define the saturation temperature at the supply pressure of the condenser. Only the last 15 points are taken into account, since the weight measurement of the expansion tank was not set up for the 24 first tests. 70PDF Image | Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen
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