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Organic Rankine Cycles for Waste Heat Recovery and Solar Uses

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Organic Rankine Cycles for Waste Heat Recovery and Solar Uses ( organic-rankine-cycles-waste-heat-recovery-and-solar-uses )

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Chapter 3: Experimental setups Figure 25: Schematic representation of the test bench The test rig was designed to have a good control and measurement of the oil mass flow rate at the expander supply. This was achieved by separating the oil from the refrigerant at the compressor exhaust and by sending it back to the expander supply through an external oil circuit. Main components of this circuit are an oil flow meter, 2 gear pumps in parallel arrangement, an oil tank with an electrical heater (used for separating the gas entrained by the oil coming from the compressor oil sump) and a needle valve (used to regulate the oil flow rate supplied to the expander). The expander was installed inside a calorimeter to determine the heat transfer to the ambient. A constant air temperature is maintained inside the calorimeter by simultaneously controlling the fan coil water flow rate and the power supply of two light bulbs. The heat balance over the calorimeter box is given by: −Q ̇cal,amb+W ̇ fan+W ̇ bulb−H ̇coil+Q ̇exp,amb=0 (12) With Q ̇cal,amb W ̇ fan W ̇ bulb H ̇ coil heat transfer between the calorimeter box and the outside environment, W fan power, W light bulb power, W enthalpy flow rate of the cooling water, W 20

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