Thermodynamics is the study of energy relationships that involve heat, mechanical work, and other aspects of energy and heat transfer. Central Heating. THERMODYNAMICS. A THERMODYNAMIC SYSTEM.
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Work done on gas or work done by gas
The STATE of a thermodynamic system is determined by four factors:
Q = U + W final - initial)
HEAT IN = INCREASE IN INTERNAL ENERGY
HEAT OUT = DECREASE IN INTERNAL ENERGYISOCHORIC PROCESS: CONSTANT VOLUME, V = 0, W = 0
Q = U + W so that Q = U
No Work Done
NET HEAT INPUT = WORK OUTPUTISOTHERMAL PROCESS: CONST. TEMPERATURE, T = 0, U = 0
U = 0
U = 0
WORK INPUT = NET HEAT OUT
e = 1 -
e = 1 -
Work = 120 J
Example 3:A steam engine absorbs 600 J of heat at 500 K and the exhaust temperature is 300 K. If the actual efficiency is only half of the ideal efficiency, how much work is done during each cycle?
Actual e = 0.5ei = 20%
W = eQH = 0.20 (600 J)
e = 40%
Q = U + W final - initial)Summary
Hot Res. TH
Cold Res. TCSummary (Cont.)