Heat Transfer; Flow; Velocity - Honeywell AUTOMATIC CONTROL Engineering Manual

HEAT TRANSFER

Table 11. Coefficient of Heat Transfer
Conversion Multipliers.
hr•sq ft•˚F
Existing Unit
Btu/hr•sq ft•˚F
Kcal/hr•sq m•˚C
EXAMPLE:
300 Kcal/hr•sq m•˚C x 0.205 = 61.5 Btu/hr•sq ft•˚F

FLOW

Existing Unit
Cubic Feet per minute (cfm)
Cubic Feet per second (cfs)
Cubic meters per second (m
Liters per second (L/s)
EXAMPLE:
900 cubic feet per minute x 0.4719 = 424.71 liters per second
Existing Unit
Cubic feet per minute (cfm)
Gallons US per minute
(gpm)
Gallons Imp per minute
(gpm)
Liters per hour (L/h)
Liters per second (L/s)
Cubic meters per hour
3
(m /h)
Cubic meters per second
3
(m /s)
1 gpm water at 20F ∆T = 10 000 Btuh
EXAMPLE:
84 US gallons per min ute x 3.785 = 317.94 liter s per min ute
Desired Unit
Btu Kcal
hr•sq m•˚C
— 4.88
0.205 —
Table 13. Flow (Gas/Air) Conversion Multipliers.
Cubic Feet per
minute (cfm)
—
60
3
/s) 2119
2.119
Table 14. Flow (Liquid) Conversion Multipliers.
Cubic feet Gallons US
per minute per minute
(cfm) (gpm)
— 7.482
0.13368 —
0.1605 1.20095
0.0005886 0.0044
2.119 15.85
0.5886 4.4028
2118.9 15850

VELOCITY

Table 12. Velocity Conversion Multipliers.
Feet
per
minute
Existing Unit (ft/min)
Feet per —
minute (ft/min)
Feet per 60
second (ft/s)
Meters per 3.281 0.05468
minute (m/min)
Meters per 196.8
second (m/s)
EXAMPLE:
950 feet per minute x 0.00508 = 4.83 meters per second
Desired Unit
Cubic Feet Cubic Meters
per seconds (cfs) per second (m
0.016667 0.0004719
— 0.02832
35.31
0.03531 0.001
Desired Unit
Gallons Liters
Imp per
per minute hour per second
(gpm) (L/h)
6.23 1699.0
0.8327 227.1
— 272.8
0.00367 —
13.20 3 600
3.666 1 000
13 198.2 3 600 000 1 000
479 ENGINEERING MANUAL OF AUTOMATIC CONTROL
GENERAL ENGINEERING DATA
Desired Unit
Meters
Feet per per
second minute
(ft/s) (m/min)
0.016667 0.3048
— 18.2882
—
3.281 60
Liters per
3
/s) second (L/s)
0.4719
28.32
— 1000
—
Cubic
Liter meters per meters per
hour
3
(L/s) (m /h)
0.4719 1.6992 0.0004719
0.06309 0.2271 0.0000631
0.07577 0.27274 0.0000758
0.002778 0.001 0.0000003
— 3.6 0.001
0.2778 — 0.0002778
3599.7
Meters
per
second
(m/s)
0.00508
0.3048
0.016667
—
Cubic
second
3
(m /s)
—