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Article: Calculating load heating requirements: the special situations.(Energy Notes)
- Article from:
- Process Heating
- Article date:
- January 1, 2004
- Author:
CopyrightCOPYRIGHT 2004 BNP Media. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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In my last column, I examined how the process heating requirements of a load are determined. Briefly, it consists of calculating how much thermal energy is required by the load and dividing that by the time allowed to heat it. That heat requirement is figured by calculating the energy absorbed to make the load's temperature rise (weight X specific heat X temperature rise) and adding any energy absorbed if the material goes through a change of state (melting, vaporization or internal structural changes). These changes occur with little or no rise in temperature, so the energy absorbed per unit of material weight is known as the latent (hidden) heat of the change.
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