Vogt HEC-10, Service Manual

Page: 109 / 114

HEC-Series Service Manual
TABLES AND CHARTS
10/21/01
11-3
All pressures are in lbs/in
2
gage (psig).
REFERENCE INFORMATION
CONVERSION FACTORS: English to Metric
To Convert From To Multiply by
Area ft
2
m
2
9.2903e-2
in
2
m
2
6.416 e-4
Energy BTU Joule (J) 1054.48
hp BTU/Hr 2546.2
kW hp 1.34
Length ft. m. 0.3048
in. m. 0.0254
Pressure lbf/ft
2
Paschals 47.88
lbf/in
2
(psi) Paschals 6894.76
in. Hg psi 0.491
in H
2
O psi 0.03612
Temperature
°
F
°
C
T
C
=5/9*(T
F
- 32)
°
C
°
F
T
F
=(9/5*T
C
) + 32
Volume ft
3
m
3
2.8317e-2
gal(U.S.) m
3
3.7854e-3
ft
3
gal(U.S.) 7.48
TABLE 11-4
CONSTANTS
Specific heat of Water 1 BTU/(lbm
°
F)
Specific heat of Air
4.19 kJ/(kg
°
C)
0.24 BTU/(lbm
°
F)
Tube-Ice Density 32-35 lbs/ft
3
Ice Latent Heat 144 BTU/hr
Water Sensible Heat
1 BTU/(lb
°
F)
Ice Melting Effect (IME)
1 Ton Refrigeration 12,000 BTU/hr
Atmospheric pressure 14.7 psia
Weight of Water 62.4 lbs/ft
3
8.33 lbs/gal
Weight of air 0.0749 lbs/ft
3
0.0100 lbs/gal
1 Horsepower 2545.6 BTU/hr
1 Kilowatt 1.34 horsepower
Gravitational accel. 9.81 m
2
/sec
TABLE 11-5