TITLE.PM5

(xxii) ENGINEERING THERMODYNAMICS

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\M-therm\th0-1

Q heat, rate of heat transfer

q rate of heat transfer per unit area

R gas constant ; thermal resistance ; radius ; total expansion ratio in compound

steam engines

R 0 universal gas constant

r radius, expansion ratio, compression ratio

S entropy

s specific entropy

T absolute temperature ; torque

t temperature

U internal energy ; overall heat transfer co-efficient

u specific internal energy

V volume

v specific volume

W work ; rate of work transfer ; brake load ; weight

w specific weight ; velocity of whirl

x dryness fraction ; length

Greek Symbols

α absorptivity

γ ratio of specific heats, cp/cv

∈ emissivity ; effectiveness

η efficiency

θ temperature difference, angle

ρ density

σ Stefan-Boltzmann constant

φ relative humidity, angle.