Heat Rate Converter
Instantly convert heat rate with our free converter. See conversion tables, formulas, and step-by-step explanations. Includes formulas and worked examples.
Reviewed by Manoj Kumar, Mathematics Educator
Formula
Converted Value = Input Value x (From Unit Factor / To Unit Factor)
Heat rate conversion uses watts as the base unit. Each unit has a known factor relative to watts. For instance, 1 BTU/h = 0.29307 W and 1 ton of refrigeration = 3,516.853 W. To convert, multiply the input by its factor to get watts, then divide by the target unit factor to get the result.
Worked Examples
Example 1: HVAC System Conversion
Problem:An air conditioning unit is rated at 36,000 BTU/h. Convert to kilowatts and tons of refrigeration.
Solution:To kW: 36,000 BTU/h x 0.29307107 W per BTU/h = 10,550.6 W = 10.55 kW\nTo TR: 36,000 / 12,000 = 3.0 tons of refrigeration
Result:36,000 BTU/h = 10.55 kW = 3.0 TR
Example 2: Boiler Rating Conversion
Problem:A steam boiler is rated at 5 boiler horsepower. What is this in kW and BTU/h?
Solution:To watts: 5 x 9,809.5 = 49,047.5 W = 49.05 kW\nTo BTU/h: 49,047.5 / 0.29307107 = 167,375 BTU/h\nAlternatively: 5 x 33,475 = 167,375 BTU/h
Result:5 boiler HP = 49.05 kW = 167,375 BTU/h
Frequently Asked Questions
What is heat rate and how is it measured?
Heat rate is the rate of thermal energy transfer per unit of time. It is essentially thermal power and is measured in watts (W) in the SI system. In HVAC and power generation, BTU per hour is commonly used. Heat rate in power plants specifically refers to the amount of fuel energy required to generate one kilowatt-hour of electricity, typically expressed as BTU/kWh. Lower heat rates indicate higher efficiency.
References
Reviewed by Manoj Kumar, Mathematics Educator · Editorial policy