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Scroll compressors offer several advantages such as: Large suction and discharge ports reduce pressure losses during suction and discharge. Physical separation of suction and compression reduce heat transfer to suction gas, leading to high volumetric efficiency. High compression efficiency, low noise and vibration compared to reciprocating compressors. Compact with minimum number of moving parts. Choice of the present expander The choice of the expansion machine was not random. The one used in this investigation is an open-drive oil-free air scroll compressor, easily converted into expander without any significant modification apart from removing the cooling fan. Moreover, an open- drive scroll compressor as expansion machine presents the following advantages: No need for lubrication. Possibility of two-phase flow operation. Nominal rotational speed (3500 rpm) compatible with that of an asynchronous machine. High maximum acceptable pressure ratio (of about 10). A 122cc machine with a built-in volume ratio of 3.95 was selected and enclosed in a cylindrical container to avoid external leakages (Declaye, 2009). Figure 6.5 shows the expander out and inside the cylindrical container. Figure 6.5 - The open-drive oil-free air compressor 6.3.2.2 Evaporator and condenser heat exchangers The evaporator comprises three plate heat exchangers assembled in an asymmetric configuration and fed with hot air flow. The asymmetric configuration allows a better heat recovery and higher power generation (Declaye, 2009). Characteristics of the evaporator heat exchangers are given in Table 6.2. The condenser consists of two plate Page | 141PDF Image | Low-Grade Heat Conversion into Power Using Small Scale Organic Rankine Cycles
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