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Evaporative Cooler Formula:
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The evaporative cooler formula calculates the required cubic feet per minute (CFM) of air flow needed for effective cooling based on room size and desired air changes per hour. This ensures proper sizing of evaporative cooling systems for optimal performance.
The calculator uses the evaporative cooler formula:
Where:
Explanation: The formula converts the total air volume needed per hour (room area × air changes) into the required airflow per minute by dividing by 60.
Details: Correctly sizing an evaporative cooler is essential for efficient cooling performance. An undersized unit won't provide adequate cooling, while an oversized unit may cause excessive humidity and energy waste.
Tips: Measure your room's square footage accurately. Typical ACH values range from 20-40 for residential spaces, with higher values needed for areas with more heat generation or poorer insulation.
Q1: What is a good ACH value for evaporative cooling?
A: For most residential applications, 20-30 air changes per hour provides effective cooling. Hotter climates or spaces with high heat loads may require 30-40 ACH.
Q2: How do I measure room square footage?
A: Multiply the length by width of the room. For irregularly shaped rooms, divide into rectangular sections and sum their areas.
Q3: Does ceiling height affect CFM requirements?
A: The standard formula assumes 8-foot ceilings. For higher ceilings, multiply your square footage by (ceiling height ÷ 8) to get the correct volume.
Q4: What factors might require a larger CFM rating?
A: Large windows, poor insulation, high outdoor temperatures, high occupancy, or heat-generating appliances may require increased CFM.
Q5: Can I use this calculator for whole-house cooling?
A: Yes, but you must calculate the total square footage of all connected living spaces and ensure proper ducting for whole-house distribution.