Thumb rules in HVAC refer to simplified guidelines or approximate calculations that can be used as a quick reference or starting point in certain situations. While they can provide initial guidance, it's important to note that thumb rules are not as accurate or comprehensive as detailed calculations or engineering analysis. Here are a few commonly used thumb rules in HVAC Cooling Load A common thumb rule for estimating the cooling load of a space is to assume a cooling capacity of 1 ton (12,000 BTU/h) for every 400 to 500 square feet of area. However, this rule can vary depending on factors such as climate, insulation, occupancy, and equipment. Airflow To determine the required airflow rate for ventilation, a rule of thumb is to provide approximately 1 CFM (cubic foot per minute) of outside air per square foot of floor area. However, specific ventilation requirements should be determined based on occupancy, activity level, and indoor air quality guidelines. Duct Sizing...
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