| How
To Choose A Chiller
Choosing
the right size recirculating chiller adds to the economies of
its use. The optimum size needed is based on the amount of heat
your applications is generating, plus additional power to maintain
temperature under varying loads.
Normally
the manufacturer of the device you are cooling will supply heat
removal information. If information isn't available, here's
how to calculate the heat load of your system:
Watts
= [DT° x (K)] / S
Where:
- DT=
The difference (D) between incoming
and outgoing tap water temperature (T) of your instrument.
Measure carefully using the same thermometer for both locations.
You may measure in Celsius or Fahrenheit.
- S = The
number of seconds to fill a one liter container.
- K = Conversion
constant for density and specific heat of water.
- Measured
in:
Celsius: Watts = [DT°C (4,186)]
/ Seconds
Fahrenheit: Watts = [DT°F (2,326)]
/ Seconds
Additional
Considerations:
- If ambient
temperature of the cooling location is above 20°C, add
1% to the calculated wattage for each 0.5°C above 20°C.
- If operating
at 50Hz, add 20% to the calculated wattage.
- If line
voltage is consistently below rated voltage, or if you work
at high altitude, add 10% to the calculated wattage.
- Future
growth cooling needs or variability of heat output of existing
unit.
Conversions:
BTU's / hr = (watts) * 3.413
Tons = (BTU's / hr) / 12,000
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