1. What is the Tonnage Calculation?

The tonnage calculation estimates the cooling capacity required for a space based on area and heat load. It's commonly used in HVAC system design to determine the appropriate size of air conditioning units.

2. How Does the Calculator Work?

The calculator uses the tonnage formula:

Where:

• \( T \) — Estimated tonnage (tons)
• \( A \) — Area in square feet (ft²)
• \( L \) — Heat load in BTU per square foot (BTU/ft²)

Explanation: This formula converts the total BTU load to tons of cooling capacity, where 1 ton of cooling equals 12,000 BTU/hour.

3. Importance of Tonnage Calculation

Details: Proper tonnage calculation is essential for selecting correctly sized HVAC equipment. Oversized units short cycle, reducing efficiency and comfort, while undersized units cannot maintain desired temperatures.

4. Using the Calculator

Tips: Enter the area in square feet and the heat load in BTU per square foot. Typical heat loads range from 20-40 BTU/ft² depending on climate, insulation, and building characteristics.

5. Frequently Asked Questions (FAQ)

Q1: What is a "ton" in HVAC terms?
A: One ton of cooling equals 12,000 BTU per hour, which is the amount of heat needed to melt one ton of ice in 24 hours.

Q2: How do I determine the appropriate heat load value?
A: Heat load depends on factors like climate, insulation, window area, occupancy, and equipment. Professional Manual J calculations provide the most accurate values.

Q3: What are typical BTU/ft² values?
A: Well-insulated homes in moderate climates may need 20-25 BTU/ft², while poorly insulated spaces in hot climates may require 35-40 BTU/ft².

Q4: Does this calculation account for zoning?
A: No, this is a simplified calculation. Complex spaces with multiple zones may require separate calculations for each area.

Q5: Should I add a safety margin to the calculated tonnage?
A: HVAC professionals typically add a 10-20% safety margin to account for extreme conditions and ensure adequate capacity.