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A well insulated, thin-walled, double-pipe, counter-flow heat exchanger is to be used to cool oil [Cp = 2.20 kJ/(kg C)] from 150 C to 40 C at a rate of 2 kg/s by water.
A well insulated, thin-walled, double-pipe, counter-flow heat exchanger is to be used to cool oil. Determine the rate of heat transfer in the heat exchanger and the exit temperature of water.
Determine (a) the electric power required (kW) to drive the pump if friction losses are neglected; and (b) the average velocity (m/s) of the water if a 20 cm diameter (ID) pipe is used.
Determine (a) the heat transfer from the compressor an (b) the volume flow rate of the refrigerant at the compressor inlet. Ignore changes in kinetic and potential energy for your calculation.
If the temperature and pressure of the steam at the nozzle exit at 400 degrees celcius and 2 MPa, the exit area of the nozzle is?
Account for variation of specific heats with temperature and model the engine as a dual cycle. Determine the amount of heat supplied per cylinder.
On an overflow structure of 50 degrees slope the water depth (measured normal to the surface of the structure) is 1.2 m (4 ft) and the streamlines are essentially straight and parallel.
What are the sources of error in your system? How can you minimize the experimental error? How would you modify this system to determine the specifi heat of a solid?
A hydraulic power generation (turbine-generator) plant is installed at a site 200 m below the free surface of a large water reservoir that can supply water at a rate of 3800 kg/s steadily.
Water is pumped from a lake to a storage tank 40 m above at a rate of 55 L/s, while consuming 22.6 kW of electric power to run the motor. Determine the overall efficiency of the motor-pump unit.
The cost of electricity is 10 cents per kWh. What is the yearly electricity cost of this refrigerator, assuming that it runs only half the time?
A 1 ton car is climbing a 200 m long uphill road with a slope of 30° from horizontal. What is the power required to get the work done in 15 seconds at a constant velocity?
The inlet area of the compressor is 130 CM^2. Assuming surrounding to be 25C find:the reversible power in kw and the entropy generation in kw and irreveribility in kw.
What is the specific gas constant for this gas in (j/kg-k), initial mass of the O2, final mass of O2, chang in total internal energy contained in the cylinder.
During a certain process the specific hea capacity of the system is given by cn=(0.4+0.004(T-273))kj/kg-k. temprature is measured in degress k.
If the specific heats cp=1000j/kgk and cv=772j/kgk what is the change in internal energy and enthalpy of the gas going from process 1 to process 2.
A container of air (with a fixed volume of 1 ft^3)develops a slow leak. The container originally is at 900 degrees at 14.696 psi. Write conservation of mass for this process.
Design a Fire resistant safety sphere with diameter of 0.5m that will protect its combustible contents from fire which may last up to 2hr.
When the particle is 6 m to the left of the origin, it has a velocity of 3 m/s to the right. Find the time for the particle to get from this position to the origin.
The maximum torsional stress is 12 ksi, and the maximum shear stress is 10 ksi. What is the von Mises stress for a point on the neutral axis of the bar at the outer radius?
The maximum torsional stress is 12 ksi, and the maximum shear stress is 10 ksi. What is the von Mises stress for a point on the upper surface of the bar?
The coefficient of performance is COPH = 15. Determine TL for the low-temperature heat reservoir and the work required to operate the heat pump, W.
Determine the speed of the block just after the impact. Also, what distance does slide up the plane before it momentarily stops? The coefficient of kinetic friction between the block and the plane i
Determine the velocity of the cart just after firing. During the firing, the man remains at the same position on the cart. Neglect rolling resistance of the cart.
Determine the speed of the crate 3s afterward. The coefficient of kinetic friction between the crate and the plane is u= 0.4.