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A living plant leaf is an open system that exchanges energy (sunlight and thermal flows) + matter (O2, CO2, water vapor, etc.) with the surroundings (the exterior). Even with irreversible processes (energy dissipation) we find that the net entropy change for the system + surroundings can decrease; i.e. dS < 0. Using equations presented in lecture and your own critical thinking: a) Explain how this is possible in terms of deS and diS. b) Explain how the Second Law remains valid for this case.
Two kilograms of air within a piston-cylinder assembly execute a carnot power cycle with maximum and minimum temperatures of 750k and 300k, respectively.
a flow of 2 kgs of saturated liquid r-134a at 200 kpa is mixed with 3 kgs of r-134a at 200 kpa and 10?c. the liquid and
pressurized water pin 10 bar tin 110 deg c enters the bottom of an l 10-m-long vertical tube of diameter d 100 mm
a ceramic has k0.8 wmk. if this ceramic is shaped into a cylinder with a porosity distribution given by p.1xl1-xl where
The temperature of the water drops to 260 F as a result of heat transfer to the surroundings. Determine the final pressure in the tank?
air enters a constant-diameter tube with an average velocity of 2 ms at a temperature of 400 k and a pressure of 0.12
Explain the differences between fire-tube boilers and water-tube boilers and discuss the major factors which affect the choice of boiler type for particular applications.
A steam plant operates on a Rankine cycle. The following conditions are given: The steam exits the boiler at 550C and 15MPa. The heat supplied to the boiler is at 1000C. The condenser pressure is 8kPa. The flow exits the condenser with 4C of subcooli..
The Cost of Recharging a Battery, A 12-V automotive storage battery is charged with a constant current of 2 amp for 24 hr.
steam enters the first-stage turbine shown in fig. 2 at 40 bar and 500degc with a volumetric flownbsprate of 90 m3min.
an 8 in. id pipe is connected by means of a reducer to a 6 in. id pipe. kerosene flows through the system at 2000
a machine table driven by closed loop positioning system consists of a motor gearbox lead screw and an optical encoder.
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