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Ducted Mini Split Sizing Formula:
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Ducted mini split sizing is the process of determining the appropriate capacity (in tons) of a ducted mini split system based on the cooling or heating requirements of a space, measured in BTU/h (British Thermal Units per hour).
The calculator uses the formula:
Where:
Explanation: This formula converts the cooling capacity from BTU/h to tons, which is the standard unit for sizing HVAC systems.
Details: Proper sizing of ducted mini split systems is crucial for energy efficiency, comfort, and system longevity. An undersized unit will struggle to maintain temperature, while an oversized unit will short cycle, reducing efficiency and comfort.
Tips: Enter the total BTU/h requirement for your space. This value should be determined through a professional load calculation that considers room size, insulation, windows, climate, and other factors.
Q1: Why is 12,000 BTU/h equal to 1 ton?
A: The term "ton" in refrigeration comes from the amount of heat required to melt one ton of ice in 24 hours, which equals 12,000 BTU/h.
Q2: What factors affect BTU requirements?
A: Room size, ceiling height, insulation quality, number of windows, climate zone, number of occupants, and heat-generating appliances all affect BTU requirements.
Q3: Can I use this calculator for heating as well?
A: Yes, the conversion is the same for both cooling and heating capacity calculations.
Q4: Should I size up or down if between standard sizes?
A: It's generally better to slightly undersize than oversize for mini split systems, as they operate most efficiently when running for longer periods rather than short cycling.
Q5: Is professional sizing recommended?
A: Yes, while this calculator provides a basic conversion, a professional Manual J calculation is recommended for accurate system sizing that considers all variables specific to your space.