Chapter hvac engineering Fundamentals: Part 1 Introduction

3.3
Rule-of-Thumb Calculations
Every HVAC designer needs some handy empirical data for use in
approximating loads and equipment sizes during the early conceptual
stages of the design process. These are typically square feet per ton
for cooling, Btu per square foot for heating, and cubic feet per minute
per square foot for air-handling equipment. The values used will vary
with climate and application and are always tempered by experience.
These numbers can also be used as ‘‘check figures’’ during the detailed
calculation procedure to alert the designer to unusual conditions or
Design Procedures: Part 1
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