BASIC HEAT TRANSFER AND SOME …

1 BASIC heat TRANSFER AND some APPLICATIONS IN POLYMER PROCESSING (A version of this was published as a book chapter in Plastics Technician s Toolbox, Volume 2, Pages 21-33, SPE 2002) John Vlachopoulos and David Strutt heat TRANSFER is a branch of engineering science which seeks to determine the rate of energy TRANSFER between bodies as a result of temperature differences. The concept of rate is the BASIC difference between heat TRANSFER and thermodynamics. Thermodynamics deals with systems in equilibrium and is concerned with the amount of heat required to change a system from one state to another. Thermodynamics does not answer the question of how fast a change is accomplished. It is the science of heat TRANSFER that deals with this question. BASIC CONCEPTS The terms temperature and heat are understood intuitively. Temperature is the physical property that describes whether a body is hot or cold.

3 On the other hand, if no work is done by the surroundings, then ΔE = Q Heat and work are different types of energy. Heat capacity C p (also called Specific Heat) is the

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