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heat exchangers fed by cold water and connected in such a way that they can be selected to operate in parallel or series configuration. For the present investigations the heat exchangers were put in parallel. The characteristics of the condenser heat exchangers are the same as those of the evaporator presented in Table 6.2. The plate heat exchangers used are illustrated in Figure 6.6. Table 6.2 - Characteristics of the heat exchangers Number of plates Total volume Dimension Chevron angle Working temperature Working pressure - 75 l 3.75 mm 250x112x189 o 60 oC -160 up to175 bar 0 up to 32 6.3.2.3 Pumps Figure 6.6 - Evaporator (Left) and Condenser (right) Two diaphragm metering pumps suitable to suck pressurized liquids (5 to 6 bar) with low viscosity at low flow rates were selected and coupled in parallel. Thus, the working mass flow rate can be adjusted by modifying the stroke length of the pistons. The membrane pumps integrated in the cycle are depicted on Figure 6.7 and their characteristics are given in Table 6.3. Stroke frequency Maximum flow rate Maximum pressure Motor Piston diameter Diaphragm diameter Stroke length Table 6.3 - Characteristics of the pumps Pump 1 (Strokes/min) 112 (50 Hz) (l/h) 210 (bar) 12 (W) 550 (1400 rpm) (mm) 40 (mm) 120 (mm) 25 Pump 2 96 (50Hz) 180 12 550 (1400 rpm) 40 120 25 Page | 142PDF Image | Low-Grade Heat Conversion into Power Using Small Scale Organic Rankine Cycles
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