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Consider the steady operation of a different self-contained refrigeration "package" for a shipping container. The device is thermally activated by heat transfer from a steady 2000 oF external source. The external thermal source is due to complete external combustion of the propane fuel. Assume all of the fuel energy is input into the device. The device absorbs 5 kJ/s of heat transfer from a -20 oF shipping container and rejects 9 kJ/s of waste heat to the +59 oF atmosphere. Determine the actual COP of this "thermally-activated refrigeration package" cycle = useful energy effect/expensive energy input. Also determine the maximum reversible COP and the theoretical minimum fuel energy input required to provide a 5 kJ/s cooling effect. Notice external work is zero; and that for a reversible cycle, (Q/T)REV = 0 (using sign convention QIN >0 and Qout<0) Calculate the cycle COP. Compare to the maximum reversible COP and minimum input needed.
the required cross-sectional area of cables in a cable-stayed bridge can be estimated by keeping cable stress just at
a 120 lbf 534 n skydiver is free-falling at an altitude of 6500 ft 1980 m. estimate the terminal velocity in mph for
A simple plate capacitor can store 6.5x10^-5 C at a potential of 10000 V. what dielectric constant must the material between the plates have if their area is 6.0x10^-5 m2 and they are 0.16 mm apart?
Determine the smallest horizontal force required to pull out wedge A. The crate has a weight of 200 and the coefficient of static friction at all contacting surfaces is = 0.7. Neglect the weight of the wedge.
Investigating A Dynamic Movement in Polar Coordinates
a double-acting duplex pump with 6.5 in liners 2.5 in rods and 18 in stokes was operated at 2000 psig and 20 cyclesmin
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A plate, 0.001 in distant from a fixed plate, moves at 2 feet per seconds and requires a force of 0.04l bar per feet square to maintain this speed. determine the fluid viscosity of the substance between the plate.
a what is the total volume of air drawn into the three cylinders each time the engine executes one revolution?b what is
(a) Draw a schematic of the system and (b) determine if the inventor's claims are true.
a 50 kg crate resting on a flat smooth surface is acted upon by a horizontal force that varies by the equation f1.5t
methane at 6 mpa and 245 k is heated at a constant pressure until its volume has increased by 90 percent. determine the
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