Measure the area and volume of each zone. Input the floor area, ceiling height, and exposed wall areas.
Moisture added to the air (e.g., human respiration, cooking).
Equipment is often sized in "tons," where 1 ton equals 12,000 BTUs. 1 ton per 500 square feet. Excel implementation: =A2/500 . 3. Air Flow (CFM) Calculation hvac calculation excel sheet 2021
UX & Excel implementation details:
Do not alter the spreadsheet's results because they contradict old rules of thumb (like "1 ton per 500 square feet"). Modern, tight homes often require far less tonnage. Over-sizing causes short-cycling, high humidity, and premature component failure. Measure the area and volume of each zone
: The statistical extreme summer dry-bulb/wet-bulb temperatures and winter dry-bulb temperatures for the specific city.
U = Overall heat transfer coefficient (or U-factor), which is the reciprocal of the total thermal resistance (R-value). A = Area of the building component (in square feet) Equipment is often sized in "tons," where 1
Solar Heat Gain Coefficient (SHGC) and U-factors. 3. Internal Heat Gains
= Cooling Load Factor (accounts for the time of day and orientation, like North vs. West). Air Infiltration and Ventilation Load
Accurate thermal load estimation is the foundation of any efficient heating, ventilation, and air conditioning system. Over-sizing equipment leads to short-cycling, high energy bills, and poor humidity control. Under-sizing results in uncomfortable spaces and overworked hardware.