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A refrigerator cycle has a COP of 3 and removes 100kW of heat from a building, which is kept at 23C. The device rejects heat to an energy reservoir at 33C. What is the net entropy change in this process? What is the maximum possible temperature of the high temperature reservoir to still satisfy the second law of thermodynamics?
a rigid container is separated into 2 compartments by a very thin solid membrane. one side initially holds 2 m3 of air
an elevator is created by using a hose hanging from the top of a 10 m building. the hose is diverted into 4 jets at the
initially an insulated rigid tank contains 2.01 kg of water at 277.7oc and 1 mpa. a heater in the wall of the tank
gasoline is being discharged from a pipe at point 2 at elevation 66.66 m. pint 1 located 965.5 m along the pipe from
a pipe is made of a material the thermal conductivity of which is simultaneously dependent on radius and temperature
i need the answer with calculating steps and details. assignment attached as a jpeg for reference
A cylindrical drill with radius r1 is used to bore vertically a hole through the centre of a sphere of radius r2.
Give two advantages of preheating the water in this way and one disadvantage and give two reasons why the presence of any sulphur in the fuel mix would be undesirable.
air at 1.0 atmosphere pressure and 77 0c enters a 5.0 mm i.d. tube with a bulk average velocity of 2.5 ms. the velocity
Calculations that show the material composition (fibre and matrix type and volume fractions) will meet the property specifications, and a justification of why this material composition is the cheapest option
question 1 give examples from your own experience of situations where friction is a desirable and b
refrigerant 134a is compressed at steady state from 2.4 bar 0oc to 12 bar 50oc. refrigerant enters the compressor with
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