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The components are to be linked to one another with a uniqu linakge system that adds nothing to overall sphere-cylinder-float vertical dimension. What size float (length and diameter) is needed if t
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.
A carnot engine operating on air accepts 50 kj/kg of heat and rejects 20 kJ/kg. Calculate the high and low reservoir temperatures if the maximum specific volume is 10 m^3/kg and the pressure after t
Jet-type pumps are sometimes used for special purposes, such as to circulate the flow in basins in which fish are being reared. The use of a jet-type pump eliminates the need for mechanical machiner
Determine: (a) the total rate of change in exergy of the steam passing through the turbine, and (b) the exergetic efficiency of the turbine.
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.
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.