Heatcraft Refrigeration Products HCS manual Air Pressure Drops- Cabinets, Filters, Wet Coils

Page 41

Air Pressure Drops- Cabinets, Filters, Wet Coils

Cabinet And Filter Air Pressure Drop

 

Air Pressure Drop - inches of water

 

 

Air Velocity^ - Feet per minute

 

 

 

 

 

Component

 

200

250

300

350

400

 

450

500

550

600

Cabinet:

V Style Cabinet^^

 

—

—

—

.10

.13

 

.16

.20

.24

.29

 

Economizer Section^^

 

—

—

.02

.03

.03

 

.04

.05

.06

.07

Filters:

Throwaway

2" Depth

.05

.08

.11

.15

.19

 

.24

.28

——

——

flat & hi

35% Efficient , Pleated

2" Depth

.08

.10

.13

.16

.21

 

.25

.30

.37

——

capacity

Permanent, Aluminum, Cleanable

2" Depth

.03

.04

.06

.08

.10

 

.13

.15

.18

.21

flat, 4"

35% Efficient , Pleated

4" Depth

.06

.07

.10

.13

.17

 

.20

.25

.29

.34

 

(60 - 65%) Efficient

21" Depth

.12

.16

.21

.26

.32

 

.38

.45

—

—

Filters:

Bag Filter

30" Depth

—

—

.19

.24

.28

 

.33

.37

.41

.44

 

 

37" Depth

—

—

.12

.17

.23

 

.27

.33

.37

.41

Medium

(80 - 85%) Efficient

21" Depth

.14

.20

.26

.32

.38

 

.44

.51

—

—

 

Bag Filter

30" Depth

—

—

.23

.28

.34

 

.40

.47

.51

.55

 

 

37" Depth

—

—

.15

.21

.26

 

.32

.38

.45

.52

and

(90 - 95%) Efficient

21" Depth

.20

.28

.36

.44

.52

 

.61

.70

—

—

 

Bag Filter

30" Depth

—

—

.32

.39

.46

 

.53

.60

.66

.72

 

 

37" Depth

—

—

.22

.29

.36

 

.44

.54

.60

.68

High

(60 - 65%) Cartridge Filter

6" Depth

.15

.20

.26

.33

—

 

—

—

—

—

 

 

12" Depth

—

—

.22

.28

.34

 

.41

.50

.58

.68

 

(80 - 85%) Cartridge Filter

6" Depth

.22

.29

.37

.46

—

 

—

—

—

—

Efficiency

 

12" Depth

—

—

.26

.32

.38

 

.46

.55

.64

.74

 

(90 - 95%) Cartridge Filter

6" Depth

.25

.34

.44

.56

—

 

—

—

—

—

 

 

12" Depth

—

—

.29

.35

.42

 

.50

.59

.70

.82

The filter air pressure drop is for air through clean filters.

Type A (1/2" O.D.) Wet Coil Air Pressure Drop*

 

Type 5 (5/8" O.D.) Wet Coil Air Pressure Drop*

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rows

Fin

Air Velocity - Feet

per minute^

 

 

Rows

Fin

Air Velocity - Feet

per minute^

 

 

Series

400

450

500

 

550

600

650

 

 

Series

400

450

500

 

550

600

650

 

6

0.18

0.22

0.26

 

0.30

0.34

0.39

 

 

6

0.25

0.30

0.36

 

0.42

0.49

0.56

 

8

0.22

0.27

0.32

 

0.37

0.42

0.48

 

 

8

0.31

0.37

0.44

 

0.52

0.60

0.68

3

10

0.26

0.32

0.37

 

0.43

0.50

0.56

 

3

10

0.36

0.44

0.52

 

0.58

0.67

0.79

 

12

0.30

0.37

0.43

 

0.50

0.57

0.65

 

 

12

0.42

0.50

0.59

 

0.66

0.76

0.87

 

14

0.34

0.41

0.49

 

0.56

0.64

0.73

 

 

14

0.45

0.54

0.64

 

0.74

0.85

0.97

 

6

0.24

0.29

0.35

 

0.40

0.47

0.53

 

 

6

0.33

0.40

0.48

 

0.56

0.65

0.74

 

8

0.30

0.36

0.43

 

0.50

0.57

0.65

 

 

8

0.41

0.50

0.59

 

0.69

0.80

0.91

4

10

0.35

0.43

0.51

 

0.59

0.67

0.77

 

4

10

0.48

0.58

0.69

 

0.81

0.93

1.06

 

12

0.41

0.49

0.58

 

0.68

0.77

0.88

 

 

12

0.56

0.67

0.79

 

0.92

1.02

1.20

 

14

0.46

0.56

0.66

 

0.76

0.87

0.99

 

 

14

0.63

0.75

0.89

 

1.03

1.14

1.34

 

6

0.31

0.38

0.45

 

0.53

0.61

0.70

 

 

6

0.41

0.50

0.60

 

0.70

0.81

0.93

 

8

0.39

0.47

0.56

 

0.65

0.74

0.84

 

 

8

0.51

0.62

0.74

 

0.86

0.99

1.13

5

10

0.46

0.55

0.65

 

0.75

0.86

0.97

 

5

10

0.60

0.73

0.87

 

1.01

1.12

1.32

 

12

0.53

0.63

0.74

 

0.85

0.97

1.10

 

 

12

0.69

0.84

0.99

 

1.11

1.27

1.50

 

14

0.59

0.71

0.83

 

0.95

1.09

1.22

 

 

14

0.78

0.94

1.11

 

1.24

1.42

1.68

 

6

0.37

0.46

0.54

 

0.64

0.74

0.84

 

 

6

0.49

0.60

0.72

 

.84

0.98

1.12

 

8

0.46

0.56

0.67

 

0.78

0.90

1.03

 

 

8

0.61

0.74

0.88

 

1.03

1.19

1.36

6

10

0.55

0.67

0.79

 

0.92

1.05

1.18

 

6

10

0.72

0.88

1.04

 

1.21

1.40

1.59

 

12

0.63

0.77

0.90

 

1.04

1.19

1.34

 

 

12

0.83

1.01

1.19

 

1.38

1.59

1.80

 

14

0.72

0.86

1.01

 

1.17

1.33

1.49

 

 

14

0.94

1.13

1.33

 

1.55

1.77

2.01

 

6

0.51

0.62

0.74

 

0.87

0.99

1.12

 

 

6

0.66

0.80

0.96

 

1.12

1.30

1.49

 

8

0.63

0.77

0.90

 

1.05

1.20

1.35

 

 

8

0.82

0.99

1.18

 

1.38

1.59

1.82

8

10

0.75

0.90

1.06

 

1.23

1.40

1.58

 

8

10

0.97

1.17

1.39

 

1.62

1.86

2.12

 

12

0.86

1.03

1.21

 

1.40

1.59

1.79

 

 

12

1.11

1.34

1.58

 

1.84

2.12

2.41

 

14

0.96

1.15

1.35

 

1.56

1.78

2.01

 

 

14

1.25

1.51

1.78

 

2.06

2.36

2.68

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*Wet coil air pressure drop for air entering at 80 °F DB and 67 °F WB over rippled high efficiency fins. Inches of water. ^ Air velocity = CFM divided by coil or filter face area in square feet. See table at top of page 40.

^^ Use face area of large coil to calculate air speed through AHV cabinet and economizer section.

41

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Page 40 Page 42
Contents Air Handlers Quality Standard IndexCabinet style Fan Type NomenclatureStandard Unit Features Direct Expansion Coils Air Handler CoilsWater Coils Heat Reclaim CoilsUnit Heater Dimensions Size Accessories- Electric HeatConstruction & Dimensions Component 208 240 460 480 Electric Heater Selection ExampleMaximum KW Accessories Filters And Auxiliary Sections Auxilary Sections- All unit Sizes Dimensions, Page 29 toAvailable Motors, Drives, Motor Starters per Horsepower Accessories for Fan and Coil SectionsMotor Drive Starter Motor Horsepower Description ‘A’ = AvailableSelection Conditions Air Handler SelectionSelection Example Selection ProcedureAir Handler Performance Quick Reference Air volume at Air handler DX air Refrigerant Chilled waterSteam Cu m/hCoil Air Handler Performance- Direct ExpansionAir Handler Perfromance- Direct Expansion Saturated Suction Temperature1339 1553Size Air Area Air Handler Performance- Chilled WaterRow Coils Std Face Air Handler Perfromance- Chilled WaterHeating 0F. Air Air Handler Performance- Hot Water/SteamSize Air Sq. Ft Heating 60F. AirOne Row Two Row Two Row One RowType a and Type 5, hot gas reclaim, heating capacities Temperature DifferenceCoil Perfromance- Heat Reclaim MBH/SQ FT Coil Performance- Direct Expansion MBH/SQ FT Refrigerant Evaporating Temperature FActual capacity will vary With coil circuiting 400 450 500 550 600Chilled Coil Perfromance- Chilled Water MBH/SQ FTRows FPM, Type a Coils 1/2 DIA FPM, Type 5 Coils 5/8 DIAFPM, Type 5 Coils 5/8 DIA Rows Coil Performance- Heating, Water & Steam500 600 650 700 400 FPM, Type 8 Coils 1 DIA RowsSize Fan PerformanceCoil Total RPM BHP Size 14 and SizeSize 20 and Size 32 3/8 Airfoil Fan Dimensions inches High Efficiency Filter Sections- DimensionsSize 65 and Size High Efficiency Filter SectionDimensions Size Accessory Flange PatternMixbox Inlet Duct Connections Sizes 03 Sizes 20Reference DimensionsMix box Motor and coil connectionDischarge Sizes 03 41 FCSizes 50 75 AF 10 1/8 For All Units Sizes12 5/8 Rows 15 5/8 MixboxDimension ‘T’ Depth is dimensionSizes 50 65 AF ‘D’ added toSize Edge Sizes 03 Mounting Locations For Vibration IsolatorsFor All Unit Sizes One and two row heating coils do not have For All Unit SizesAll mounting holes are 5/8 inch diameter Rows Inch filters Vibration Isolators, Quantity Required Coil SectionModels Air Flow Reheat Position Preheat PositionWeight in pounds Net Weights and Metal GaugesTo estimate weights for other coils Air Handler Component Unit SizeFace Area Air Handler Unit Size Square Feet Face Areas- Air Pressure Drops, Dry CoilsFin Air Velocity Feet Per minute Air Pressure Drops- Cabinets, Filters, Wet CoilsDepth Flat & hi 35% Efficient , Pleated Physical Data CFM Range Cooling Unit Size19.25 25.50 34.00 40.38 49.50 64.58 74.91 Small 16.04 21.25 27.63 31.88 40.50 51.67 59.42Mechanical Specification
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