The exact thermal load can be determined by using a full heat load analysis.
According to the standard calculation, it takes 288,000 BTUs to melt a ton of ice in 24 hours, or 12,000 BTUs per hour. The result is then expressed in BTUs per hour.
Square foot methods are considered rule of thumb for use in quick calculations. Tonnage: In reference to air conditioning, a ton measures how much heat removed by the system would be needed to melt 2,000 pounds, or one ton, of ice in a 24-hour period. Also, if you hire a local certified AC contractor using our Free Local Quotes service, you won’t get it wrong. Note: This tool is provided strictly as a quick method of computing general size and value conditions. Our AC size calculator will help you get it right. This will help you to select equipment, space plan for any mechanical rooms and ceiling space and create a budget. Since most air conditioning units are provided in increments of ½ a ton (6,000 BTU/hour) sizes, this system should be quite close to the actual units that will be used. The HVAC systems analyzed in this calculator include (1) split systems/packaged A/C, (2) air cooled chilled water systems and (3) water cooled chilled water systems. The tool has various factors pre-set with the most commonly used values but may be changed at will by clicking the “Additional Factors” button to expose these additional fields. Select your region and input the height of the zone as well as the area (length times width). The system is pre-set to a 72-degree indoor temperature and a 95-degree outdoor temperature. This tool is based on the square foot method, with computations added for the most important values included, such as insulation, windows, and other contributing factors. An easy-to-use HVAC tool for calculating necessary thermal output capacity (in BTUs)
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