Experimental and Numerical Analysis of a PCM-Supported ...

The enthalpy and humidity of the saturated air depend on its temperature at constant
pressure and can be calculated using the following empirical correlation [132];
3
a
2
a
h 0.00585T
0.497T
19.87T
207.61
(2.10)
a
3
a
2
a
a
6
4
3
w 2.19*10 T 1.85*10
T 7.06*10 T 0.077
(2.11)
a
where T a is the saturated air temperature in ºC.
HDH unit sizing
As a common practice, the number of transfer units (NTU) will be used as a measure
for the humidifier size (see appendix D1), while the condenser is assumed to have
the same size as the humidifier for symmetrical design of the HDH unit. The NTU
can be related to the performance characteristic (KaV/L) (see appendix D1). Based
on the steady state experimental analysis, Nawayseh et al. [159] has developed the
following correlation for forced convection:
a
0.16
KaV / L 0.52( L/
G)
for forced draft 0.1< L/G