Monday, October 5, 2009
HVAC Control (01) - Chilled Water Fan Coil UnitsAir Conditioning System Equipment Room Fan Coil Unit Chilled Water Fan Coil Application
1. Constant Volume (Cooling) with Temperature Control2. Constant Volume (Cooling) with Temperature & Humidity Control3. Multi-Speed (Cooling) with Temperature Control4. Variable Speed (Cooling) Control
1. Constant Volume (Cooling) with Temperature Control Air Conditioning Chilled Water Fan Coil Unit Configuration BAS Controller Microprocessor FCU Remote Controller Speed Control (Hi/Med/Low) Control Panel Filter Air Change Rate Single Speed -Constant Volume System Temperature Control Critical Chilled Water Control Valve Modulating On-Off Control Temperature Trend Pattern Set point Return Air Temperature ( Room Air Temperature) Sense Controller Set Point Chilled Water Flow Motorized Valve Control Temperature Control Critical PI (Proportional & Integral) ControlAutomatic Control Automatic Control Systems Constant Volume (Cooling) with Temperature Control
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BAS I/O Points Schedule
NO. INPUT / OUTOUT VARIABLES DO AO DI AI
1 RETURN AIR TEMPERATURE 1
2 FAN ON/OFF CONTROL 1
3 FAN ON/OFF STATUS 1
4 FAN TRIP STATUS 1
5 LOCAL/BAS SWITCH MODES 1
6 CHILLED WATER VALVE CONTROL 1
7 CONTROL VALVE POISTION 1
TOTAL : 1 1 3 2
Note: Temperature control shall be of PI modePoint Schedule
Local Control No. 1 : Room/Return Air Temperature No.6 :Chilled Water Valve Control PI Mode No.7 : Chilled Water Valve Position No. 2 : FAN ON/OFF CONTROL No. 5 : LOCAL/BAS SWITCH MODES Central BMS No. 3 : On/Off Status No. 4 : FAN TRIP STATUS Monitoring Alarm
Modulating Valve:
Size Flow Characteristic
Modulating Valve Drive :Valve Controller Compatible
SensorType Range & Accuracy Response Time
ControllersReliability ( )Interface (BAS )
Post Automatic Control Systems FCU Off (i.e. Fan Off) () Motorized Control Valve Close (Off) Interlock (Controller Program Logic )
2. Constant Volume (Cooling) with Temperature & Humidity Control Control Space Temperature Humidity Sensible Heat Ratio Sensible Heat Ratio = (Sensible Load / Total Load ) > 0.8 Space Sensible Load Humidity Control Critical Humidity Dew Point Temperature Treated Outdoor Air Humidity Control Critical ( )
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Humidity i. Constant Volume Air Supply with Treated Outdoor Air Ventilation (when RSH is high)ii. Constant Volume Air Supply with Re-Heat Coil (when RSH is low / varies)iii. Variable Volume Air Supply with Constantly cool coil
Wet Process Sensible Heat Ratio Humidity Constant Volume System RH Sensible Heat Re-heat Heater Thermistor Controlled Electrical Heater Control AHU Condenser Water
Heater Capacity Control BAS point NO. INPUT / OUTOUT VARIABLES DO AO DI AI
1 RETURN AIR TEMPERATURE 1
2 FAN ON/OFF CONTROL 1
3 FAN ON/OFF STATUS 1
4 FAN TRIP STATUS 1
5 LOCAL/BAS SWITCH MODES 1
6 CHILLED WATER VALVE CONTROL 1
7 CONTROL VALVE POISTION 1
8 Electric Heater Capacity Control 1
TOTAL : 1 2 3 2
Note: Control shall be of PI modeHumidity Control Process Psychrometry Humidity Control Dew Point Temperature 10.8C Chilled WaterTemperature 5 to 6.5 C 8C Variable Fan Speed
3. Multi-Speed (Cooling) with Temperature Control Constant Volume (Thermostat / Control Panel) Hi/Med/Low Mode
4. Variable Speed (Cooling) Control FCU Manufacturer Special Equipments Remote Microprocessor Control Controller FCU Fan Drive Motor Drive ( Stepless Motor Drive)
5. Chilled Water Valve Control: On-Off vs. (PI) Modulating Absolute Humidity (Humidity Ratio) (WetProcess Storage () Human Occupancy ) Sensible Cooling / Heating Temperature Relative Humidity (RH) ( Humidity Control ) Psychometric Chart Extract
Room Condition Setpoint 23C 50% RH 1C 3% RH Valve On-Off Temperature Set point RH
PI (Proportional plus Integral) Modulating Control Temperature Set point RH
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Sensible Load Latent Load Humidity (Latent) Load = Instant Load Wet Process (Spray Washing, Steam Fumes, etc. ) Local Exhaust Process Interlock Chilled water Valve On Coil Apparatus Dew Points Dew Point Temperature ) Condensate Valve Coil Temperature RH Variation ( Apparatus Dew Point Temperature Dew PointTemperature Dry Coil Chilled Water Supply Temperature DryCoil )
Posted by Ko Chaw - at 5:27 PM
Labels: Control, HVAC
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