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Sylvain Quoilin Chapter 4 : Description of the experiments 4.1.3 Starting procedure. ● All the measurements devices are turned on. The ice bath reference for the thermocouples is set. The acquisition of the data is started. ● The water valve is opened to feed the condenser with water. ● The two valves isolating the expander are closed, the bypass valve is opened. ● The pump is switched on. The working fluid circulates in the cycle a few minutes before any further operation. ● The hot air generator is activated, the air flows through the plate exchangers ● As the pressure increases in the cycle, the air that may have entered the cycle is purged at the drain cock. ● When the refrigerant temperature reaches approximately 100 °C at the exhaust of the evaporator, the expander is started : this is achieved by opening progressively the two isolating valves at the inlet and at the outlet of the expander, and by slowly closing the bypass valve. ● When the speed of the asynchronous machine reaches approximately 1500 rpm, the switch is turned on to connect the machine to the electric grid. This procedure remains unchanged for the three sets of tests. 4.1.4 Parameters and test results For this first series of tests, three main parameters of the cycle are modified : the refrigerant flow rate, the water flow rate at the condenser and the hot air temperature. The expander rotation speed is set to a constant value of 2200 rpm (imposed by the asynchronous machine) The hot air flow rate is kept almost constant around a value of 85 g/s. 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 Minimum value 176.5 °C 135.2 °C 70 % 0.21 l/s Maximum value 188.5 °C 160.4 °C 90 % 0.59 l/s 43PDF Image | Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen
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