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Sylvain Quoilin Chapter 4 : Description of the experiments 4.2.3 Modifications on the test bench The experience of the first tests permits to determine the weakest points of the test bench. The uncertainties on the fluid flow rate are highly prejudicial and result in difficulties in modeling the different elements of the cycle. The ambient losses are detrimental to the heat balances, and no control of the refrigerant charge is possible. The following modifications are performed in order to improve the behavior of the test bench : ● The heat exchangers, the pipes and the expander are completely insulated in order to reduce the ambient losses. This operation is performed to improve the quality of the heat balances over each element, and to improve the efficiency of the cycle by reducing the heat losses. The insulating material is an elastomeric rubber insulation, with a thickness of 13 mm and a 0°C conductivity of 0.036 W/(mK). ● The water flow meter is connected to an impulsion data acquisition system to measure the instantaneous water flow rate (which is not constant because of slight variations in the water supply pressure). ● Installation of the Coriolis flow meter, in order to achieve an accurate measurement of the refrigerant flow rate. This parameter is indeed primordial, as it is considered in the modeling of each element. Figure 28: View of the insulated expander 56PDF Image | Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen
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