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Sylvain Quoilin Chapter 3 : Description of the Test Bench This chapter describes the experimental study carried out on a heat recovery Rankine cycle bench. For the purpose of this study, a test bench is set up in the thermodynamics laboratory in Liège. The aim is to prove the feasibility of an ORC, to evaluate the potential heat recovery efficiency, and to validate the models of the different components. Figure 4 shows a schematic view of the facility. 3.1 Configuration of the cycle : The working fluid used is R123. The heat source is composed of two hot air flows at a temperature ranging from 150 to 190°C. One flow goes to the heat exchangers HX1 and HX2and the other flow goes to the exchanger HX3. The expander prototype is an oilfree air scroll compressor adapted to be run in expander mode. It can be isolated and bypassed thanks to 3 bulb valves, in order to start the test in appropriate conditions. The expander is coupled to an asynchronous machine by means of a torquemeter and two beltand pulley couplings. The asynchronous machine works either in motor mode or brake mode, depending on the power developed by the expander. An asynchronous machine is chosen for its ability to impose the rotational speed to the expander. The condenser is fed with tap water. Figure 4 shows its configuration with 2 heat exchangers put in parallel. However, several dispositions were tested and will be discussed in the following chapters. The liquid condensate leaving the condenser is then pumped towards the higher pressure boiler. 20PDF Image | Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen
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