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A household refrigerator operates with cold- and hot-temperature reservoirs of Tc = 5°C and Th = 25°C, respectively. When new, the cold and hot side resistances are Rc,n = 0.05 K/W and Rh,n = 0.04 K/W, respectively. Over time, dust accumulates on the refrigerator's con- denser coil, which is located behind the refrigerator, increasing the hot side resistance to Rh,d = 0.1 K/W. It is desired to have a refrigerator cooling rate of qin = 750 W. Using the results of Problem 1.38, determine the modified coefficient of performance and the required power input W under (a) clean and (b) dusty coil conditions.
air enters a turbine operating at steady state at 500 kpa 860 k and exits at 100 kpa. a temperature is 460 k. stray
a brayton cycle produces 14 mw with an inlet state of 17oc 100 kpa and a compression ratio of 161. the heat added in
during a steady flow processdry saturated steam at 450 psia expands in a turbine to 10 psia. the mechanical efficiency
saturated steam at 2 mpa is contained in a piston-cylinder device. the initial volume is 0.25 m3. heat is slowly
air in a piston-cylinder assembly and modeled as an ideal gas undergoes two internally reversible processes in series
Determine the maximum force P which can be applied to the block in the direction shown before slipping begins - specify this design minimum value of x to prevent slipping of the jaw.
an air-hockey puck has a mass of 50 g and is 9 cm in diameter. it is placed on an air hockey table at 20 c and the film
A losed system consists of 0.5 kmol of ammonia occupying a volume of 6m^3. Determine: The weight of the system in Newtons, and The specific volume in m^3/kmol AND m^3/kg. Let g = 9.81 m/s^2.
a newly developed diagnostic test indicates that 80 of students predicted to score 100 on an exam actually do. the
an important radionuclide produced in water-cooled nuclear reactors is 16n which has a half-life of 7.13 s and emits
Consider a mixture of saturated liquid water and saturated steam at 2 bar and x = 0.95 that is compressed adiabatically and reversibly to 25 bar in an open system. What is the initial temperature and entropy?
determine the torsional strength and stiffness of a closed thin walled tube of mean radius r and thickness t and a
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