
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.