How many BTU/hr needed to cool 500 CFM of air 100F degrees?

In summary, to calculate the BTU/hr needed to cool 500 CFM of air by 100F degrees, the formula is BTU/hr = CFM x (T2 - T1) x 1.08, where CFM is 500, T1 is 100F, and T2 is the desired temperature. The 1.08 factor accounts for the specific heat of air. BTU/hr stands for British Thermal Units per hour and is a unit of measurement for energy. The BTU/hr calculation is an estimation and may not be entirely accurate due to factors such as insulation, building materials, and climate. It is recommended to consult a professional HVAC technician for a more accurate calculation. The BTU/hr calculation
  • #1
matt621
29
3
And does it matter if you are going from 200F to 100F or 500F to 400F? ie, is it temperature dependent?Thanks
 
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  • #2
It takes approximately 1.08 BTU/hr to cool a CFM by 1 degree, so I'll let you calculate that. :wink:

For the second part, no, it isn't quite constat over large temperature differences. At 500F, it is only about 5% larger. You can google for tables and/or equations for specific heat at various temperatures.
 

1. How do you calculate the BTU/hr needed to cool 500 CFM of air 100F degrees?

The formula for calculating BTU/hr is: BTU/hr = CFM x (T2 - T1) x 1.08

Where CFM is the air flow rate, T1 is the initial temperature, and T2 is the desired temperature. In this case, CFM is 500, T1 is 100F, and T2 is the desired temperature.

2. What is the significance of 1.08 in the BTU/hr formula?

The 1.08 factor in the BTU/hr formula accounts for the specific heat of air, which is the amount of heat required to raise the temperature of 1 pound of air by 1F degree. This factor is necessary to accurately calculate the amount of heat needed to cool a specific volume of air.

3. What is the unit of measurement for BTU/hr?

BTU/hr stands for British Thermal Units per hour, which is a unit of measurement for energy. It is commonly used to measure the amount of heat needed to cool or heat a space.

4. How accurate is the BTU/hr calculation in determining the cooling capacity?

The BTU/hr calculation is an estimation and may not be entirely accurate in determining the cooling capacity. Factors such as insulation, building materials, and climate can impact the actual cooling capacity. It is always best to consult a professional HVAC technician for a more accurate calculation.

5. Can the BTU/hr calculation be used for all types of cooling systems?

The BTU/hr calculation is commonly used for air conditioning systems, but it may not apply to other types of cooling systems such as evaporative coolers or refrigeration systems. These systems may have different factors and considerations that need to be taken into account for accurate calculations.

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