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ISAIME 2019 IOP Conf. Series: Materials Science and Engineering 694 (2019) 012014 (a) IOP Publishing doi:10.1088/1757-899X/694/1/012014 (c) Figure 6. Pressure of fluids static contour: (a) Pentane 12000 rpm, (b) Butane 14000 rpm, (c) R245fa 10000 rpm From figure 6, the contour of the static pressure of each fluid at turboexpander rotation speed which reaches the highest power and efficiency. The three pressure contour images show the symptoms of expansion in the same place where the fluid is expanded when it enters the leading edge of guide vane and exits through the trailing edge of rotor, the only difference from the expansions is reduction of pressure that occurs. This corresponds to the impulse blade with a zero reaction where a pressure drop occurs at stator or guide vane [12]. From figure 7, the contour of temperature of each fluid where the turboexpander rotation reaches the highest power and efficiency. The three working fluids (Pentane, Butane, R245fa) exhibited the same phenomenon, those are uniform decrease in temperature occurs after the fluid passes through the leading edge of the guide vane with different temperature range values. The small range of temperature reduction that occurs in Pentane compared to other working fluids, is an indication of the low power and efficiency produced. 6 (b)PDF Image | Turboexpander on Organic Rankine Cycle with Working Fluids
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