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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.
The refrigerant is now allowed to cool. Determine the pressure when the refrigerant first starts condensing. Also, show the process on a P-v diagram with respect to saturation lines.
a simplified gear system for a mechanical watch is shown. knowing that gear a has a constant angular velocity of 1
saturated water vapor at 200 kpa is expanded slowly and without friction i.e. internally reversibly and isothermally in
The concrete walls and roof of a garage are 15-cm thick. The inside dimensions of the garage are 8-m long, 6-m wide, and 2.5-m high. The door is made of 12-mm thick hardwood and is 6-m wide and 2.5-m high. The garage is modeled in the figure below. O..
In the large scale manufacturing of Jaguar Bold Blue Bouncy Balls (JB4) for children, it is important that their material properties be sufficiently uniform. One way to detect gross differences in their material properties is to observe how a ball re..
A rigid vessel of capacity 0.6 m3 contains dry saturated steam at 4.0 bar. The vessel is cooled until the pressure is reduced to 2.0 bar, Calculate; a) the mass of steam in the vessel.
Calculate the forces in members AB, BG, and GF. Solve for each force from an equilibrium equation which contains that force as the only unknown
An Emperor penguin in Antarctica may be modeled as a cylinder 1m high with a diameter of 0.2m. The male Emperor penguin warms his egg for sixty-four days during the Antarctic winter (no solar input), in deep sub-zero temperatures. During this time th..
The 60-mm diameter shaft rotates at 300 rev/min. this motion is caused by the unequal belt tensions on the pully of 800 N and 450 N. Determine the power transmitted and the maximum shear stress developed in the shaft.
Air at 17oC and 200kPa is in a rigid, 2m3, insulated tank that has a paddle wheel in it. 733 kJ of work is put into the system by the paddle wheel. How much entropy is produced?
A flat plate maintained at a temperature of 50 C experiences a flow of atmospheric air at 15 C. If the temperature gradient at the plate's surface at a given downstream location is -43 C/mm, what is the local heat transfer coefficient?
two kilograms of air within a piston-cylinder assembly executes a carnot power cycle with maximum and minimum
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