Psychrometry is concerned with the measurement of atmospheric
attributes (e.g. temperature, relative humidity, entropy
and enthalpy) that describe the thermodynamic behavior of moist
air (ASHRAE, 2002). Hyland and Wexler (1983) developed formulas
for determining thermodynamic properties of moist air and
water. However, ideal gas relations have been demonstrated to be
valid in the range of 50 to 50 1C with marginal error of less than
0.7% (Kuehn et al., 1998). To propose a dehumidification system
for a particular location, it is necessary to obtain psychrometric
properties of its critical (worst case) point (i.e. the highest
recorded temperature and relative humidity) plus the reasonable
lower range, where the process would be proposed to be feasible.