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Cooling Capacity Formula:
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Cooling capacity refers to the amount of heat energy that a cooling system can remove from a space per unit time. It is typically measured in BTU/hr (British Thermal Units per hour) or tons of refrigeration, where 1 ton equals 12,000 BTU/hr.
The calculator uses the cooling capacity formula:
Where:
Explanation: The formula calculates the heat removal capacity based on the volume of air being moved and the temperature difference achieved by the cooling system.
Details: Accurate cooling capacity calculation is essential for proper HVAC system sizing, energy efficiency optimization, and ensuring comfortable indoor environments. Oversized systems cycle frequently, while undersized systems cannot maintain desired temperatures.
Tips: Enter CFM (air flow rate) and ΔT (temperature difference between supply and return air). Both values must be positive numbers. The calculator will provide cooling capacity in BTU/hr and equivalent cooling tons.
Q1: What is the significance of the 1.08 constant?
A: The constant 1.08 accounts for the specific heat of air (0.24 BTU/lb·°F) and air density (0.075 lb/ft³) at standard conditions, converting CFM and ΔT to BTU/hr.
Q2: How is cooling tons related to BTU/hr?
A: 1 ton of cooling equals 12,000 BTU/hr, which originates from the heat absorption of melting 1 ton of ice over 24 hours.
Q3: What is a typical ΔT for HVAC systems?
A: Most residential and commercial HVAC systems operate with a ΔT of 15-20°F between supply and return air for optimal efficiency and comfort.
Q4: Can this formula be used for heating calculations?
A: Yes, the same formula applies for heating capacity calculation, as it represents the heat transfer capacity of air movement.
Q5: What factors affect cooling capacity requirements?
A: Room size, insulation quality, number of occupants, equipment heat loads, solar gain, and climate conditions all influence cooling capacity needs.