Thermodynamics and Heat Exchangers Joe Lannan FDST 896 Independent Study Instructor: Dr. Georgianna Whipple.

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Presentation transcript:

Thermodynamics and Heat Exchangers Joe Lannan FDST 896 Independent Study Instructor: Dr. Georgianna Whipple

Thermodynamics Energy: the capacity to do work or produce energy Law of conservation of energy: energy can be converted from one form to another but can be neither created or destroyed.

Energy System: part of the universe on which we focus on. Surroundings: include everything else Exothermic: energy flows out of the system Endothermic: energy is absorbed from the surroundings. Calorimeter: device used to measure heat energy flow.

Laws First law of thermodynamics: the energy of the universe is constant. Internal energy (E):  E = q + w q: represents heat and w represents work q = SH ( specific heat) + m ( mass) +  T

Laws continue Second law of thermodynamics: in any spontaneous process, there is always an increase in the entropy of the universe. Entropy measure the disorder of a system. Nature favors disorder, look at your bedroom as an example.

Heat transfer Heat flow is always from hot objects to cold. Example: touching a hot object, direction of energy flow? Placing ice cubes in cold water, direction of energy flow?

Heat exchangers Used to transfer heat Example: air conditionors, refrigerators, and cars Describe the energy flow in each. Energy (q) balance: q into cold = q out of hot = q across barrier

Types of Heat Exchangers Noncontact: Plate: two liquids of different temperatures move past each other on alternating plates Shell and tube: two liquids of different temperatures move past each other one inside a tube and the other in the shell around the tubes.

Plate heat exchangers

Shell and tube heat exchangers

Food industry heat exchangers Production of ice cream Describe the energy flows Describe the heating medium Describe the cooling medium Describe the barrier

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