Process Heat Load Calculations
Whether you’re in need of a chiller for a laboratory, your laser, CT Scanner or your your brewery, the terminology used remains the same. In order to use the heat load calculations it is important to have a clear understanding of some general definitions. The list below will not make an engineer out of you, however, it will provide you with a basic understanding of the terminology. Should you require assistance with sizing a chiller for you specific needs, we will be happy to assist you. Feel free to contact us at any time.
BTUH or Btu / Hr – British Thermal Units per Hour
PSIG – Pounds per Square Inch Gauge
PSIA – Pounds per Square Inch Absolute
One Ton of Refrigeration = 12,000 Btu per Hour
One Refrigeration Ton = 3,025 kg calories per hour
Btu/hr for Water = GPM x 500 x Delta-T
Btu/hr for other fluids = Lbs. Per Hr. x Specific Heat x Specific Gravity X Delta-T
Btu/hr for Solids = Lbs. Per hour x Specific Heat x Delta-T
Btu/hr = kW x 3,413
Btu/hr = HP x 2,544
PSIA = PSIG 14.7
Btu/hr = kW x 1000 / .293
kW = Btu/hr / 1000 x .293
Lbs/Hr = GPM x Density x 8.022
Lbs/Hr = GPM x 501.375 x Specific Gravity
Specific Gravity = Density / 62.4
GPM of Water = Btu/hr / Specific Heat / Specific Gravity / Delta-T / 500
Btu/hr for other fluids = Lbs. Per Hr. x Specific Heat x Specific Gravity X Delta-T
Why would you use “Specific Gravity” if your input variable is all ready inputted as “Lbs. Per Hr.” it would all ready be compensated for.
Heat load calculations are automatically done by the software, and it also recommends the required air-conditioning system capacity, thus making the process easier and much faster.