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The device is not insulated and operates in an environment of 90 degree F. Evaluate whether the second law of thermodynamics is violated. Provide quantitative justification.
A small motor weighing 19.3 lbs is mounted on 4 springs in parallel in such a manner that only vertical motion is possible . Each isolator has a k=45 lb/in and the total damping in the entire system
If the turbine is 90 percent efficient, how much energy can be produced if the water is emitted to the atmosphere through a 20 cm diameter pipe?
Saturated liquid water at 8.58Mpa undergoes a reversible isothermal process in a cylinder until the pressure reaches .100Mpa. Calculate the heat transfer and work per kg of water for this process.
A 90 percent efficient turbine accepts water at 400 kPa in a 16 cm diameter pipe. What is the maximum power output if the flow rate is (a) 0.08 m3/s.
To maintain a dwelling steadily at 68 F on a day when the outside temperature is 32 F, heating must be provided at an average rate of 700 Btu/min.
If the volume flow rate at the exit is 1.5 m3/s ; the inlet area is 0.06 m2 ; and the outlet area is 0.12 m2 ; determine Average velocity of air at the turbine outlet. Power produced by the turbine.
What is the maximum electric power (per kilogram of water) that can be obtained from a hydroelectric power station located at the foot of a 350m dam? Please use exergy analysis and state your assum
Two blocks of equal masses of the same material with constant specific heat are initially at temperature twice that of the ambient where T, ambient = 300 K. Using only the environment, the heat capa
After passing through the evaporator, the refrigerant exits as saturated vapor as 12 °C. The compressor uses 1.6 kW of power. What is the actual heat pump COP for this system?
Using the numbers from part a. simulate city driving with the Corolla. Make an assumption on the average number of stops per mile the carmakes and the average in-town driving speed. Adjust these num
Air at 1 atm and 15 C blows parallel to the 8m side at a velocity of 6 m/s. Determine the heat loss from the solar collector to the air, and the drag force on the solar collector from the wind.
The water will be heated by passing it through a 2m long section of the tube where the surface temperature is being maintained at a constant temperature of 110 degrees C.
The water will be cooled to 20 degrees C by passing it through a cold section of the tube where the surface of the tube is being maintained at a constant temperature. The cold section of the tube is
The convection heat transfer coefficient in the furnace is uniform and 215 W/m^2-K. Determine the time it takes to heat the plate to the target temperature of 600°C.
What is the maximum thermal conductivity of the insulation material such that by adding insulation always reduces the heat loss?
A hot-water stream at 80 degrees C enters a mixing chamber with a mass flow rate of 0.5 kg/s where it is mixed with a stream of cold water at 20 degrees C.
If the slide is to be of slope tan, determine the restrictions on the dimensions of the boxes, the length and angle of the slide, the friction, etc.
Water at 20 bar, 400oC enters a turbine operating at steady state and exits at 1.5 bar. Stray heat transfer and kinetic and potential energy effects are negligible. A hard-to-read data sheet indicat
A team of engineers are required to examine the VIV of their new drill design before building the full-scale prototype. How can they achieve full similarity between their model and the full-scale dr
Determine the minimum annual operating cost of a heat pump-powered water heater. Assume that a heat pump-powered system has an actual coefficient of performance of 2.5.
A cold-air standard open Brayton cycle operates with a compressor pressure ratio of 12. Air enters the compressor at 14.7 psi. The minimum and maximum temperatures are 525 °R and 2600 °R, re
Why does the temperature rise? Determine the initial volume. Determine the work done during the process Determine the heat transfer during the process.
Steam enters an adiabatic turbine steadily at 7 MPa, 500 degrees C and leaves at 100 kPa. If the mass flow rate is 6.2 kg/s and the isentropic efficiency is 77%, determine the power output of the t
During the process the temperature of the water changes from 10 degree C to 15 degree C. Compute the change in specific internal energy, specific enthalpy, and specific entropy.