Engineering Manual o.. - HVAC.Amickracing

AIR HANDLING SYSTEM CONTROL APPLICATIONSFor heating conditions it is assumed that:1. Design outdoor air condition is –18°C DB and 30 percentrelative 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.OA-18°C DB30% RHMA41 KELVINSPACE23.5°C DBRA 24°C DB, 17°C WB3HEATING12HUMIDIFIERDISCHARGEHEATING COILDISCHARGEC3264The following results are obtained:ItemNo.Explanation1 Heating coil leaving air temperature will be ashigh as required to satisfy the spacetemperature controller.2 Humidification will be provided to satisfyspace humidification requirements.3 The space heating and humidifying loadvaries with people and weather.4 The 1 kelvin DB RA rise is discussed in thecooling example.254ENGINEERING MANUAL OF AUTOMATIC CONTROL