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A water tank has an inflow line 1 ft diameter and two outflow lines of 0.5 ft diameter. The velocity in the inflow line is 5 ft/s. The velocity out one of the outflow lines is 7 ft/s.
A thick black-painted wood block at 20 C is subjected to constant solar flux of 1250 W/m2. If the absorptance of the block is 0.92 what is the temperature of the exposed surface after a time of 20 m
The R-134a undergoes a process that increases its volume by 40%. Calculate the final temperature and enthalpy of the R-134a.
A carnot heat pump is to be used to heat a house and maintain it at 25C in the winter. On a day when the average outdoor temp remains at about 2C , the house is estimated to lose heat at a rate 5500
Air flows on both sides of a counterflow heat exchanger operating at steady state, with a mass flow rate of 1 lb/s on each side. Determine exergetic efficiency of the heat exchanger.
A Completely reversible air container provides 36,000Btu/hr of cooling for a space maintained at 70 Degrees Fahrenheit while rejecting heat to the environmental air at 110 Degrees Fahrenheit.
An orifice meter is installed in a 12 inch ductile iron pipe carrying water at 60 degrees F. A mercury manometer is used to measure the pressure difference across the orifice when the expected range
The thermometer in this problem: (A thermometer has a time constant of 10s and behaves as a first-order system. It is initially at a temperature of 30°C and then suddenly subjected to a surround
A thermometer has a time constant of 10s and behaves as a first-order system. It is initially at a temperature of 30°C and then suddenly subjected to a surrounding temperature of 120°C.
A thermometer is initially at a temperature of 70°F and is suddenly placed in a liquid which is maintained at 300°F. The thermometer indicates 200 and 270°F after time intervals of 3 and
The maximum and minimum depths of the plate are 2m and 1 m from the free surface. calculate the hydrostatic force on one face of the plate , and the depth of the center of pressure.
Assuming Tci as constant, determine the expression for uncertainty of heat exchanger efficiency using an appropriate method.
A freshly drawn glass fiber (100 µm in diameter) breaks under a tensile load of 40 kN . After subsequent handling, a similar fiber breaks under a tensile load of 0.15 N .
Determine the power required to maintain the clean room's temperature by a reversible refrigeration cycle operating between cold and hot reservoirs at 55oF and 80oF, respectively, and the correspond
The R-134a is then heated to a final temperature of 30 degrees centigrade. Find the final quality (if saturated) or pressure (if superheated) of the R-134a and its final specific internal energy, u.
One surface of a 12-cm-thick slab (thermal conductivity, k=2.5 W/m. degree C) is maintained at 100 degree C. The other surface is exposed to a fluid at 70 degree C. and the heat transfer coefficient
One surface of a 12-cm-thick slab (thermal conductivity, k=2.5 W/m. degree C) is maintained at 100 degree C. The other surface is exposed to a fluid at 70 degree C.
Heat is now added to the air, determine the work done by the air and the total heat transferred when the volume doubles. Also show the process on a P-v diagram.
Determine the change in internal energy, the change in enthalpy, the heat transfer, and the work done for (a) a constant-volume process and (b) a constant-pressure process. Use SI units. Show pv and
At a given location the airspeed is 20 m/s and the pressure gradient along the streamline is 100N/m^3. Estimate the air speed at a point .5 m farther along the streamline.
If the maximum and minimum pressures in the cycle are 6 MPa and 80 kPa, respectively, determine the power produced per cycle in kJ.
Assume that the tests indicated that a tensile stress of 120000 psi normal to the crack would cause a crack of the same size and shape to progagate. will the pressure vessel explode?
It is desired to put oil hole through a part subjected to a stress field given by sigma xx = 15 ksi. Find the direction of the hole.
Assuming that blood behaves as a Newtonian fluid, determine the entrance length for each fiber and assess whether it is small relative to the length of the hollow-fiber unit.