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• Total Chiller Capacity (Tons)• Chiller Manufacturer’s
Recommended System Volume*• Actual System Volume (Gallons)
Zilmet ZCBT Chilled Water Buffer Tank Sizing and
Zilmet ZHBT Hot Water Buffer Tank Sizing
Oct2020
*Chiller manufacturers recommend between 3 to 6 gallons per ton for typical HVAC and 6 to 10 gallons per ton for nominal cooling when temperature accuracy is critical.
This pdf will calculate for you. Enter the variables in the three highlighted sections.
The example shows sizing for a 260 gallon tank. Choose a Zilmet ZCBT-300.
Chilled Water Buffer Tank Three input variables
are required:
• Boiler Cycle Time* (Minutes)• Minimum Boiler Output (BTU/Hr)• Minimum Rate of Heat Extraction
from tank** (BTU/Hr)• Temperature Differential*** (F)
This pdf will calculate for you. Enter the variables in the four highlighted sections.
The example shows sizing for a tank of 100 gallons. Choose a Zilmet ZHBT-120.
Hot Water Buffer TankFour input variables
are required:
