Honeywell AUTOMATIC CONTROL SI Edition Engineering Manual page 264

AIR HANDLING SYSTEM CONTROL APPLICATIONS
For heating conditions it is assumed that:
1. Design outdoor air condition is –18 C DB and 30 percent
relative humidity.
2. RA condition is 24.5 C DB and 13.5 C WB.
3. System operates on 25 percent minimum outdoor air.
4. Space temperature is set at 23.5 C.
5. Space humidification control is set at 50 percent.
4
1 KELVIN
SPACE
23.5 C DB
MA
OA
-18 C DB
30% RH
RA 24 C DB, 17 C WB
3
2 HUMIDIFIER
DISCHARGE
1 HEATING COIL
DISCHARGE
HEATING C3264
The following results are obtained:
Item
No. Explanation
1 Heating coil leaving air temperature will be as
high as required to satisfy the space
temperature controller.
2 Humidification will be provided to satisfy
space humidification requirements.
3 The space heating and humidifying load
varies with people and weather.
4 The 1 kelvin DB RA rise is discussed in the
cooling example.
ENGINEERING MANUAL OF AUTOMATIC CONTROL
254