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Sylvain Quoilin Chapter 4 : Description of the experiments 4.2 Second set of tests A second series of 19 tests is performed in November 2006. The purpose is to validate the models over a wider range of parameters, and to evaluate the possibility of improving the performances of the cycle. 4.2.1 ● ● ● 4.2.2 Modifications on the test bench In order to decrease the pressure drops on the condenser, the latter is modified. Instead of three plate exchangers in series, two heat exchangers are used in parallel, as shown in figure 12. In order to improve the measurement of the water flow rate at the condenser (which is of key importance), the water is deviated to a water tank mounted on a very accurate balance (sensitivity 100 gr). The time to fill the tank with 100 kg of water is measured and the flow rate is deduced. These measurements also permit the calibration of the water flow meter. It is found that the flow rate given by the water flow meter has to be corrected by 2%. An electricity counter is added to measure the pump electrical consumption. Description of the tests More parameters are modified for this second series of tests. In addition to the refrigerant flow rate, water flow rate and hot air source temperature, the expander rotation speed and the hot air flow rate are modified as well. The modification of the expander rotational speed is achieved by modifying the diameter of the pulley on the expander shaft. Three diameters are used : 180 mm, 140 mm, and 112 mm The expander speed is proportional to the diameter of the pulley. This modification can obviously not be performed while the cycle is working. A complete stopping of Figure 21: 3 different pulleys used to modify the expander rotational speed 45PDF Image | Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen
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