Enthalpy of air

The steam used in this process is generated by the turbine exhaust gas. Typically, water at 14.7 psia (1 Bar) and 80 °F (26.7 °C) enters the pump and regenerator, where it is brought up to 60 psia (4 Bar) above the compressor discharge and the same temperature as the compressor discharged air. The steam is injected after the compressor but far upstream of the burner to create a proper mixture which helps to reduce the primary zone temperature in the combustor and the NO output. The enthalpy of State 3 hi,) is the mixture enthalpy of air and steam. The following relationship describes the flow at that point ... 

V = totver volume, ft /ft plan area ic = enthalpy of air saturated at wet bulb temperature, Btu/lb dry air... 

Prepare a plot of the saturation curve for air-water. Establish the operating line by starting at the point set by the oudet cold water temperature and the enthalpy of air at the wet bulb temperature, and with a slope L /Ga assumed between 0.9 and 2.7. See Figure 9-109. 

Total hold-up, ft3 liquid/ft packing volume Enthalpy of air at any temperature higher than inlet, Btu/lb dry air note hj = exit air Enthalpy of inlet air to tower, equivalent to enthalpy of saturated air at wet bulb temperature, Btu/lb dry air from Moist Air Tables, ASHVTE Guide... 

AwsHi Afus//, Fig. 5.1). Data suited to dilute conditions have been obtained from enthalpies of air-water partitioning (i.e., = Avap//1 + Awa// Fig. 5.1). Since in both... 

Air-Octanol Partition Constants (Kiao), Average Enthalpies of Air-Pasture Transfer (Aap//,), and Average Concentrations in Pasture (Cjp) and Air (Cja) of Three PCB Congeners... 

A//is 61400 J moU determined from the slope, m, in Equation 6.16 by Sahsuvar et al Note that in this study, AH actually represented the enthalpy of water to air volatilisation, rather than the enthalpy of air to water dissolution, and we consider 61,400 as approximate only. Therefore ... 

Before solving the equations, we need system property data, which, in this case, are thermodynamic properties. Equations 3.2.9 and 3.2.11 states that we may obtain vapor pressures for water from steam tables, such as those compiled by Chaar et al. [13]. Equation 3.2.10 also states that we can find the enthalpy of vaporization in the steam tables. We assume that the air-water mixture is ideal to calculate the enthalpy of air, so we can use the mole-fraction average of the pure-component enthalpies. Equations 3.2.12 and 3.2.13 in Table 3.2.1 give the mole fraction average of the inlet and outlet enthalpy. Table 3.2.1 also lists pure component enthalpies for water vapor (Equations 3.2.14 and 3.2.16) and for air (Equa-... 

The enthalpies of air at the inlet and outlet conditions relative to air at the reference. state (Hi and //3. respectively) are determined from Table B.8 as... 

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