FORM 150.26-EG1 (116)
JOHNSON CONTROLS
77
SI Metric Conversion
Values provided in this manual are in the English inch-pound (I-P) system.
The following factors can be used to convert from English to the most common Sl Metric values.
TEMPERATURE
To convert degrees Fahrenheit (°F) to degrees Celsius
(°C), subtract 32° and multiply by 5/9 or 0.5556.
To convert a temperature range (i.e., 10°F or 12°F chilled
water range) from Fahrenheit to Celsius, multiply by 5/9
or 0.5556.
EFFICIENCY
In the English l-P system, chiller efficiency is measured
in kW / ton:
kW/ton =
kW input
tons refrigeration effect
In the Sl Metric system, chiller efficiency is measured in
Coefficient of Performance (COP).
kW/ton =
kW input
kW
refrigeration effect
kW / ton and COP are related as follows:
kW/ton =
3.516
COP
COP =
3.516
kW/ton
MEASUREMENT
MULTIPLY THIS
ENGLISH VALUE
BY
TO OBTAIN THIS
METRIC VALUE
CAPACITY
TONS REFRIGERANT
EFFECT (ton)
3.516
KILOWATTS (kW)
POWER
KILOWATTS (kW)
NO CHANGE
KILOWATTS (kW)
HORSEPOWER (hp)
0.7457
KILOWATTS (kW)
FLOW RATE
GALLONS / MINUTE (gpm)
0.0631
LITERS / SECOND (L/s)
LENGTH
FEET (ft)
304.8
MILLIMETERS (mm)
INCHES (in)
25.4
MILLIMETERS (mm)
WEIGHT
POUNDS (lb)
0.4536
KILOGRAMS (kg)
VELOCITY
FEET / SECOND (fps)
0.3048
METERS / SECOND (m/s)
PRESSURE DROP
FEET OF WATER (ft)
2.989
KILOPASCALS (kPa)
POUNDS / SQ. INCH (psi)
6.895
KILOPASCALS (k Pa)
FOULING FACTOR
ENGLISH l-P
(fT
2
°F hr/Btu)
EQUIVALENT Sl METRIC
(m
2
k/kW)
0.0001
0.018
0.00025
0.044
0.0005
0.088
0.00075
0.132
Summary of Contents for YCWL 0056SE
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