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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
Control Diagram
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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
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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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Newer Post Older Post
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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