Air Conditioner Capacity Calculation Formula

Air Conditioner Capacity Formula:

\[ Capacity (BTU/h) = CFM \times 1.08 \times \Delta T \]

Capacity (BTU/h):

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1. What is the Air Conditioner Capacity Calculation Formula?

The Air Conditioner Capacity Calculation Formula estimates the cooling capacity in BTU/h based on airflow (CFM) and temperature difference (ΔT). This calculation is essential for determining sensible heat removal capacity in HVAC systems.

2. How Does the Calculator Work?

The calculator uses the capacity formula:

\[ Capacity (BTU/h) = CFM \times 1.08 \times \Delta T \]

Where:

\( CFM \) — Airflow rate in cubic feet per minute
\( \Delta T \) — Temperature difference in degrees Fahrenheit
\( 1.08 \) — Constant factor accounting for air density and specific heat

Explanation: The formula calculates sensible heat capacity, which represents the heat associated with temperature change without phase change (latent heat).

3. Importance of Capacity Calculation

Details: Accurate capacity calculation is crucial for proper HVAC system sizing, energy efficiency optimization, and ensuring adequate cooling performance for specific spaces and applications.

4. Using the Calculator

Tips: Enter CFM in ft³/min and temperature difference in °F. Both values must be positive numbers. The result represents sensible cooling capacity in BTU/h.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between sensible and total capacity?
A: Sensible capacity deals with temperature change only, while total capacity includes both sensible and latent (humidity removal) components.

Q2: What is a typical CFM range for residential AC units?
A: Residential systems typically range from 400-1500 CFM depending on the unit size and space requirements.

Q3: How does ΔT affect capacity calculation?
A: Higher temperature differences result in higher capacity requirements. Typical ΔT for AC systems is 15-25°F.

Q4: Can this formula be used for heating calculations?
A: Yes, the same formula applies for sensible heating capacity calculations with appropriate temperature differences.

Q5: What factors affect the constant 1.08?
A: The constant is based on standard air conditions (0.075 lb/ft³ density and 0.24 Btu/lb·°F specific heat) at sea level.