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Sylvain Quoilin Chapter 4 : Description of the experiments ● Installation of an expansion tank at the exhaust of the pump. This tank has two goals : ○ The first goal is to absorb the variations of the refrigerant flow rate due to the volumetric piston pump in order to make its measurement possible. This measurement is indeed limited by the acquisition frequency of the system : The pump strokes have a frequency of 1,87 Hz The acquisition frequency of the coriolis flow meter is 150 Hz The frequency of the acquisition card is 1 Hz The Coriolis flow meter is hence perfectly capable of measuring the variations of the flow rate at the exhaust of the pump, but the acquisition system has a too low acquisition frequency that will result in irregular variations in the measured flow rate. The role of the expansion tank is to absorb the variations and to smooth the flow rate curve. ○ The second role of the tank is to allow the modification of the refrigerant charge in the cycle : the tank is hanged to a piezoelectric force transducer that measures the weight of the tank and thus the amount of refrigerant in the device. The expansion tank is halffilled with refrigerant and the other half is filled with nitrogen under pressure. The lower end is connected to the exhaust of the pump and the upper end is connected to a gas cylinder that allows the adjustment of the pressure (see figure 29). If more fluid is required in the cycle, the nitrogen pressure is increased and the level in the tank lowers. A valve is added in the circuit downstream to the expansion tank, to increase the pressure drop when required. Increasing this pressure drop will increase the absorption of the flow rate variations by the expansion tank. A simulation of the expansion tank is proposed in section 4.2.4.2. 57PDF Image | Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen
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