Jun 13

Process Heat Load Calculation & Definitions


 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


    July 29, 2020 at 4:31 pm ·

    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.

  2. widalElody
    January 22, 2022 at 5:46 pm ·

    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.

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