Herricane CS
®
Series
A p p l i c a t i o n G u i d e
24
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SECTION IV PERFORMANCE AND SPECIFICATIONS
Heat Gain and Temperature Rise
Heat gain, and the resulting temperature rise, of the air flow is caused by two sources:
1. Heat transfer from the steam distribution manifolds - considered Efficiency.
The heat transfer is manifest in two forms:
a. Convection from distribution manifold(s) to the air.
b. Radiation from distribution manifold(s) to the air and duct walls with consequential convection to the air.
2. Sensible heat transfer from the water vapor to the air.
To calculate the total heat gain to the air, humidifier efficiency, and air temperature rise, use the following two charts and
formulas.
NOMENCLATURE
m
(IN) = mass flow rate of steam entering humidifier
m
(OUT) = mass flow rate of steam discharging from humidifier
m
(LIQ) = mass flow rate of condensate from humidifier
f
= heat gain from humidifier per unit length of manifold
u
= heat gain due to sensible heat transfer from steam per unit rate of flow
h
= total heat gain
n
= efficiency of humidifier
l
= total length of manifolds(s)
x
= heat gain due to sensible heat transfer from discharge steam
Q
= air flow rate ∆T = air temperature rise V = air velocity
v
= air specific volume A = duct cross sectional area
