Cooling Load Check Figures Ashrae Pdf -

Suppose your calculation came back at 90 W/m² for a retail store (ASHRAE range 150–250). You are 50% low . Something is wrong.

The 400 sq ft/ton Rule is Dead: How to Use ASHRAE Fundamentals to Sanity Check Your Cooling Loads cooling load check figures ashrae pdf

Blindly trusting the output is dangerous. Before you size a chiller or select an AHU, you need a rapid, engineering-based sanity check. While many engineers still whisper the old rule of thumb (400 sq. ft. per ton), ASHRAE Handbook—Fundamentals provides a much more accurate, albeit often overlooked, method for spot-checking results. Suppose your calculation came back at 90 W/m²

Open your ASHRAE Handbook—Fundamentals. In the current edition (2021/2025), Chapter 18 (Nonresidential Cooling and Heating Load) contains the gold mine: Table 9 & 10 , typically titled “Cooling Load Check Figures for Typical Commercial Buildings.” The 400 sq ft/ton Rule is Dead: How

Let’s look at how to use the cooling load check figures to validate your model in under 10 minutes.

These tables provide (or Btu/h·ft²) ranges for total cooling loads based on building type and glazing percentage.

Also, They are ±20% accurate at best. They are a filter , not a scale .