Heat load (BTU) = Length (m) x Width (m) x Height (m) x 141. So, for a room measuring 5m x 4m x 3m = 60 > x 141 = 8,460 BTU. (For measurements in feet, the formula becomes: Heat load (BTU) = Length (m) x Width (m) x Height (m) x 4)
The Hourly Analysis Program (HAP) is a computer programme that aids engineers in the design of commercial HVAC systems. For load estimates, HAP use the ASHRAE transfer function approach, and for energy analysis, it employs thorough 8,760 hour-by-hour simulation methodologies.
Calculate the size of the room or house that has to be cooled. You can use a measuring tape to do this for a room.
To calculate the square footage of a room, multiply its length by its width.
Increase the square footage by a factor of 20. This is a measurement of the space's BTU cooling load.
The industry standard for sizing house HVAC return and supply ducts and registers is Manual D. Based on the findings of the Manual J load calculation, the Manual D duct design distributes the proper quantity of heating and cooling to each room.
The Manual J calculation is a formula that determines a building's HVAC capacity. Because it describes the size of equipment required to heat and cool a building, it's also known as an HVAC load calculation.
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