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Cengel Thermodynamics Chapters 1–3
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Cengel Thermodynamics Chapters
Cengel Thermodynamics
1–3 Flashcards
Chapters
Cengel
– Heat
Thermodynamics
1–3
Transfer
Flashcards
Concepts
Chapters
–Study
Heat1–3
Guide
Transfer
Flashcards
PDF.pdf
Concepts
–Study
Heat Guide
Transfer
PDF.pdf
Concepts Study Guide PDF.pdf
,Comprehensive Study Flashcards on Thermodynamics and Heat Transfer
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Terms in this set (102)
First law of thermodynamics Energy cannot be created or destroyed.
Second law of thermodynamics Energy has quality as well as quantity. Processes occur in the direction
of decreasing energy.
Closed system A system in which no matter is allowed to enter or leave. Matter is fixed.
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Isolated system A system that can exchange neither energy nor matter with its
surroundings.
Open system A system in which exchanges of matter or energy occur across system
boundaries.
e = E/m (kJ/kg) e = The total energy of a system on the unit mass basis (pg. 9)
Macroscopic energy A form of energy a system possesses with respect to an outside
reference frame (KE or PE).
Microscopic energy A form of energy related to molecular structure or the degree of
molecular activity. The sum of microscopic forms of energy is the
internal energy, denoted by U.
KE = (m*V^2)/2 (kJ) The energy system possesses as a result of its motion relative to some
reference frame (pg. 10)
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ke = (V^2)/2 (kJ/kg) per unit mass basis of KE (pg. 10).
PE = mgz (kJ) The energy that a system possesses is based on its elevation in a
gravitational field (pg. 10).
pe = g*z (kJ/kg) per unit mass basis of PE, where z is the elevation based on the center
of gravity of the system relative to an arbitrarily selected plane.
E = U + KE + PE (kJ) Energy of a system (pg. 10).
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