15_mechanical_HVAC

15_mechanical_HVAC - Division15Mechanical HVAC Concepts...

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Division 15 - Mechanical HVAC
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Concepts Heat is a form of energy. Heat is produced by the movement of  molecules in a substance. Add more heat, and the molecular  movement is increased. Intensity of the movement determines  the physical state of a substance: solid,  liquid, or gas.
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Terminology for Test Temperature (Fahrenheit or Celsius) is a  measurement of intensity of the molecular  movement in a substance Btu – British Thermal Unit A measure of heat quantity, equal to the  amount of heat required to raise 1 pound of  water 1 degree Fahrenheit  1 Watt is equal to approximately 0.341 Btu/ hr
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Terminology Sensible Heat – energy that causes a  rise in temperature but does not alter  the physical state of a substance Latent Heat – energy that alters the  physical state of a substance
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Methods of Heat Transfer Conduction – heat transfer through  materials in contact
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15_mechanical_HVAC - Division15Mechanical HVAC Concepts...

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