Stulz ULTRASONIC - Page 16

ULTRASONIC
16
Copyright STULZ GmbH 02/1997
CAPACITY CALCULATION FOR ULTRASONIC HUMIDIFIERS
The mixing point for the outer air percentage 50% is half of the connecting
straight line between L
W
and L
R
. From the mixing point M and from L
R
a
perpendicular is drawn at the upper edge of the h-x diagram. On basis of the
perpendicular line at point M, a water content of 5.2 g/kg and, at point L
R
of 8,8 g/kg can be determined.
This results in an ∆x of 8.8 g/kg - 5.2 g/kg = 3.6 g/kg. This means that 3.6 g
of water per kg hourly recirculated air have to be provided.
The mass of the hourly recirculated air results from the volume flow (2000
m³/h) multiplied by the specific weight ρ of the air
(1,20 kg/m³).
V
L
x ρ = 2000 m³/h x 1,20 kg/m³ = 2400 kg/h
As 3,6 g of water have to be added hourly per kg of air, the output of the
humidifier can be calculated as follows:
2400 kg/h x 3.6 g/kg =
8640 g/h