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Sylvain Quoilin Chapter 4 : Description of the experiments the expander is necessary before changing the pulley. A frequency inverter could be used to vary the rotational speed in a simpler way. The conditions in which the tests are performed are the following : Parameter First hot air source temperature Second hot air source temperature X pp Condenser water flow rate Expander rotation speed Air flow rate Minimum value 172.6 °C 135.9 °C 50 % 0.13 l/s 1776 rpm 0.084 kg/s Maximum value 182.3 °C 179.1 °C 100 % 0.70 l/s 2664 rpm 0.113 kg/s Maximum value 3.5 52 g/s 1.03 kW 6.1 % 69 % 36.8% 18.5 % Mains results : Pressure ratio at the expander Refrigerant flow rate Output shaft power Cycle efficiency Expander isentropic effectiveness Carnot efficiency Exergetic efficiency Minimum value 2.8 44 g/s 0.67 kW 4% 53 % 30 % 11.6 % The exhaustive description of the tests parameters and results is available in appendix 3. Although higher values of the shaft power were expected for this second set of tests, the contrary is observed : the output shaft power is decreased. This is mainly due to a lower working fluid flow rate : it will be shown in section 4.1.2 that the pump is not able to impose the flow rate for those tests, and less heat is recovered from the hot air source. Nevertheless, the efficiency of the cycle is increased from a maximum of 5.4% in the first tests up to 6.1%. 46PDF Image | Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen
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