The air is delivered at a pressure of 201.3 kN/m 2 absolute (1 bar gauge) and at a temperature of 100 ☌. It will be assumed that 0.5 kg/s of air (24.5 m 3/min at free air conditions), having a relative humidity of 70%, is drawn into the compressor at a pressure of 101.3 kN/m 2 absolute (standard atmospheric pressure) and at a temperature of 20 ☌. This case will be used as an example of applying the steady-flow energy equation. A water consumption figure was given as 2% of the airflow rate. In dealing with the staging of positive-displacement blowers, in Chapter 6, which describes air movers, it was mentioned that water sprays could be used to reduce the temperature of the outlet air, instead of a conventional heat exchanger. 29.16 to 29.18, instead of absolute values, which are essential for the ideal gas law. This means that Celsius temperatures can be used directly, as shown in Eqns. The datum for the specific enthalpy values in Fig. 29.17 is taken as 273.16 K, which is the triple point of water, which = 0.01 ☌, and so 0 ☌ is taken as the datum for all thermal energy quantities in the steady-flow energy equation. Variation of specific enthalpy of saturated vapor with saturation temperature, for steam
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