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when more power is available to the compressor, more fluid can be pumped, resulting in more cooling capacity. However, this relies on whether the thermostatic expansion valve can provide the flow needed, so long as the rest of the parameters such as compressor efficiency and evaporating and condensing temperatures remaining unchanged. Both temperatures (essentially saturation pressures) can affect the amount of fluid available for cooling across the thermostatic expansion valve. For the data sets in Fig. 19, as expander power was increased, the difference between the evaporating and condensing pressures were changed slightly in favor of more cooling along with the higher expander and compressor rotational speed which also favored higher cooling capacity. The counteracting factors are lower isentropic efficiency for the compressor due to higher pressure ratio and lower refrigerant vapor density at the compressor inlet due to lower pressure and temperature. According to the figure, the cooling capacities for most of the cases were between 3.5 and 4.5 kW, which are below the designed 5.3 kW cooling capacity. Although it is possible that the evaporator and/or compressor were undersized, the low cooling capacity currently observed is likely attributed to the fact that the cooling cycle was running considerably off its design point. The 5.3 kW design specification of cooling capacity was based on indoor and outdoor air temperature of 32 °C and 48.9 °C, respectively. Thi s would provide enough driving force across the thermostatic expansion valve to achieve the needed mass flow rate. Because the unit was tested inside a lab with both the evaporating and condensing temperatures the same, there is not enough driving pressure difference to achieve the target flow rate which was believed to be the primary reason for the reduced cooling capacity at the conditions tested. 1.000 0.900 0.800 0.700 0.600 0.500 0.023 0.028 0.033 Power Cycle Mass Flow Rate (kg/s) 0.038 Expander Power Output (kW) Recuperator Effectiveness Figure 15: Expander Power Output and Recuperator Effectiveness vs. Mass Flow Rate 22 Expander Power Output Wexp and Recuperator Heat Transfer Effectiveness εrecpPDF Image | Performance of a Combined Organic Rankine Cycle
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