By Francis G. Shinskey
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47 a Btu/lb The steam tables indicate, however, that expansion is not isothermal, such that the final temperature reached is 989°F. 020 Btu/lb-°R—essentially the same result as obtained for an ideal gas. 2. Selecting Control Valves While many procedures have been written describing methods for sizing control valves, most begin with given inlet and outlet pressures. Only in rare instances are these pressures actually constant, and still less often are they selected for optimum performance of the process.
49) for values of a thus found. The results are plotted in Fig. 12 for a valve with a rangeability of 50. 12 indicates that an equal-percentage valve is capable of providing an installed characteristic that is nearly linear, when comparatively little pressure d r o p is allocated to it at m a x i m u m flow. However, the rangeability is reduced in proportion to the pressure-drop allocation. At full flow, the d r o p is only Ap , while near zero flow it increases to Ap . 51) F o r the valve plotted in Fig.
Thermodynamics and Energy Conservation As a consequence, users of throttling devices may have considered them to be loss-free, hence bearing little importance to any energy-conservation effort. This is, of course, false. While they may not waste energy directly, they lose available work, with the result that the energy passed is less useful. Ultimately, the result is wasted energy. 1. Isenthalpic versus Isentropic Expansion The pressure in a stream may be reduced with or without the extraction of work.