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Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen

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Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen ( modeling-low-temperature-rankine-cycle-small-scale-cogen )

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Sylvain Quoilin Chapter 4 : Description of the experiments This chapter describes the 3 series of tests performed on the test bench. For each set of test, a summary and a critical analysis of the results is proposed. The evolution and the improvements of the cycle during those tests are described. 4.1 First set of tests : A first set of 13 tests is carried out in September­October 2006. 4.1.1 ● ● ● ● 4.1.2 Configuration of the test bench : For this first series of tests, the condenser is composed of three plate heat exchangers associated in series. The Coriolis flow meter is not yes installed. The evaporator is set up as described in section 3.4. The water flow meter is not connected to any acquisition device. The instantaneous water flow rate is thus not known. Description of the tests : The expander is set up and adapted asdescribed in chapter 3. A preliminary test is carried out in order to evaluate the peripheral leakage area : the expander is connected to a pressurized air tank, whose pressure is initially 4 bars. The time evolution of the pressure inside the tank is measured and allows the evaluation of the leakage from the inside of the expander through the peripheral seal. The main difficulty encountered in this first set of tests is the lack of flow meter on the refrigerant side. The flow rate is calculated using the heat balance over the condenser. In order to achieve an acceptable accuracy on this flow rate, the T on the water side cannot be too small and thus a maximum water flow rate cannot be surpassed. This limited flow rate reduces the performances of the heat exchange in the condenser and the global efficiency of the cycle. Since the pressure in the water network can vary, the water flow rate has to be measured manually as often as possible. 42

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