The "garbage in, garbage out" rule applies. Double-check your square footage and orientation (North, South, East, West).

| | | | | --- | --- | --- | | Solar Radiation | SHGC | A (m²) | I (W/m²) | Q (kW) | | Windows | 0.5 | 20 | 500 | 5.0 | | Internal Heat Sources | W (W) | N | Q (kW) | | Equipment | 1000 | 2 | 2.0 | | Total Cooling Load | | | | 7.0 |

Would you like the actual Excel formulas and a downloadable .xlsx mockup prepared?

Using the Darcy-Weisbach or Altshul-Tsal equations, a 2021 sheet automates:

Formulas for heat gain through walls, roofs, glass (solar gain), partitions, and lighting. Latent Heat Load Calculation:

Uses the calculated airflow (CFM) to determine the physical dimensions of supply and return ducts based on friction rates and velocity limits. Equipment Selection (Manual S):

hvac calculation excel sheet 2021
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