AIR HANDLING UNIT SELECTION

a. AHU Selection Data and Chilled Water Flow

b. AHU Selected Data
c. Schematic Diagram of the AHU showing the different
parameters
d. High Lighted Selected Data on the Brochure
e. Specification of the AHUs
 AIR HANDLING UNIT SELECTION DATA
Air-handling Units
ITEM
AHU 11 AHU 12 AHU 13

Capacity in Tons (Grand Total Heat or Total Capacity) 15 15 12

TC in Tons and BTU/HR 180,000 180,000 144,000

Sensible Capacity (Room Sensible Heat+Outdoor Air 10 11 8

Heat) SC in Tons and BTU/HR 120,000 132,000 96,000

Entering Dry Bulb / Entering Wet Bulb in F 80/66 79/69 78/65

Leaving Dry Bulb / Leaving Wet Bulb in F 56/55 59/58 60/59

Dehumidified CFM 6100 6000 4800

External Static Pressure in inch water gage 0.39 0.55 0.46

Chilled Water Flow in gallons per minute 36 36 29

Entering / Leaving Chilled Water Temp. F 45 / 55 45 / 55 45 / 55

Chilled Water Flow = (12000 x 15) / (500 x (55-45)) = 36 gpm For AHU 11
 AIR HANDLING UNIT SELECTED DATA
ITEM AHU 11 AHU 12 AHU 13
Unit Model / Size
Fan CFM (with reference to Dehumidified CFM) 6150 4800
Type of Fan (Forward, Backward or Aerofoil curve Blades) Forward Backward Backward
Selected Motor Brake Horsepower 5
Sheave Revolution per minute 1086
Total Static Pressure 1.84
External Static Pressure (Air Distribution Losses in inch water gage) 0.39 0.55 0.46
Internal Static Pressure (Losses in the AHU in inch water gage) 1.38
a. Angle Filter 0.39
b. Mixing Box 0.15
c. Cooling Coil (Air Side) 0.84

Cooling Coil Model

Cooling Coil Capacity in BTU per hour 150,000
a. Face Area in Square Feet
b. Face Velocity in Feet per minute 500 550 600
c. Number of Rows per coil 4 6 8
d. Cooling Coil Entering Dry and Wet Bulb Air Temperature in F 78/65
(80/67)
e. Cooling Coil Leaving Dry and Wet Bulb Air Temperature in F 60/59
(61/62)
Cooling Coil Chilled Water Flow in gallons per minute 30
Cooling Coil Entering and Leaving Chilled Water Temperature in F 45 / 55 45 / 55 45 / 55
Cooling Coil Chilled Water Pressure Drop in feet 2.77
SAMPLE - AIR HANDLING UNIT SELECTED DATA
ITEM AHU 1 AHU 2
LPC-AC 08-E-J LPC-AC 10-E-J
Unit Model / Size
Size 8 Size 10
Fan CFM (with reference to Dehumidified CFM) 3200 5500
FAN
Type of Fan (Forward, Backward or Aerofoil curve Blades) Forward Forward
Selected Motor Brake Horsepower 2 5
Motor Revolution per minute 1064.9 1086
External Static Pressure
0.4647 0.4647
(Air Distribution Losses in inch water gage)
Internal Static Pressure
1.11 1.73
(Losses in the AHU in inch water gage)
TOTAL STATIC
Dampers (Face/Bypass Damper) 0.19 0.35
PRESSURE
Mixing Box 0.10 0.15
Flat Filter 0.27 0.39
Cooling Coil (Air Side) 0.55 0.84
Total Static Pressure 1.5747 2.1947
Cooling Coil Model Size 8 Size 10
Cooling Coil Capacity in BTU per hour 91000 186320
Face Area in Square Feet 5.98 11.05
Air Face Velocity in Feet per minute 430 565
Side Number of Rows per coil 4 4
Cooling Cooling Coil Entering Dry and Wet Bulb Air Temperature in F 80/67 80/67
Coil
Cooling Coil Leaving Dry and Wet Bulb Air Temperature in F 58.4/ 58.1 54.78/ 54.43
Cooling Coil Chilled Water Flow in gallons per minute 36 48
Water
Cooling Coil Entering and Leaving Chilled Water Temperature in F 44 / 54 44 / 54
Side
Cooling Coil Chilled Water Pressure Drop in feet 1.30 2.77
FAN PERFORMANCE CURVE
(AHU Vertical Top Back Discharge – page 49)
FILTERS & MIXING BOX
AIR PRESSURE DROP
(Page 19)
COOLING COIL
AIR PRESSURE DROP
(Page 17)
CHILLED WATER COOLING CAPACITY
(Page 78)
 Dcfm = 5500 CFM

Total Static Pressure = 1.84 in. Wg

Schematic Diagram

AHU 13 - LPC-AC 10 –E-J / Size 10 Fan Model/Size = LPC-AC 10 –E-J / Size 10

Fan BHP = 5 HP

Fan RPM = 1086 RPM

RETURN LDB = 61˚F

AIR LWB= 62 ˚F

OUTSIDE MIXING Pressure Coil= 2.77 in feet. (Water Side)

AIR BOX EDB = 80˚F
EWB= 67˚F

INTERNAL STATIC PRESSURE = 1.38 in. wg 45˚F 55˚F

30 GPM
Mixing Box = 0.15 in. Wg
Angle Filters = 0.39 in. Wg
Cooling Coil = 0.84 in. Wg
CHILLED WATER
PUMP
HIGH LIGHTED AHU BROCHURE
(Pages 1)
HIGH LIGHTED AHU BROCHURE
(Pages 2)
HIGH LIGHTED AHU BROCHURE
(Pages 6)
HIGH LIGHTED AHU BROCHURE
(Pages 14)
HIGH LIGHTED AHU BROCHURE
(Pages 15)
HIGH LIGHTED AHU SPECIFICATION
(Mechanical Specification, page 118)
HIGH LIGHTED AHU SPECIFICATION
(Mechanical Specification, page 119)