ENGINEERING CMANUAL OF AUTOMATION CONTROL
AIR HANDLING SYSTEM CONTROL APPLICATIONS
254
For heating conditions it is assumed that:
1. Design outdoor air condition is 0°F DB and 30 percent
relative humidity.
2. RA condition is 76°F DB and 56°F WB.
3. System operates on 25 percent minimum outdoor air.
4. Space temperature is set at 74°F.
5. Space humidification control is set at 50 percent.
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 2°F DB RA rise is discussed in the
cooling example.
C2573-1
MA
HEATING
RA 76°F DB, 62.5°F WB
HEATING COIL
DISCHARGE
1
2
3
4
OA
0°F DB
30% RH
SPACE
74°F DB
HUMIDIFIER
DISCHARGE
2F
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