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A completely reversible heat pump produces heat at a rate of 300 kw to warm a house maintained at 24degrees c.The exterior air,which is at 7degrees c, serves as the source. calculate the rate of ent
Find the entropy production in a throttling process per unit mass for ammonia. Take the inlet state as specified as saturated liquid (give any pressure). Throttle the ammonia to half that pressure.
Each glass bottle has an empty dry mass of 120 grams. Based on these values, estimate amount of make-up water required per hour, and the power needed to heat the bottles and water.
A nozzle is attached to a vertical pipe and discharges water into the atmosphere as shown in the figure. When the discharge is 0.1m^3/sec, the gage pressure at the flange is 40kPa.
A small town has a peak power requirement of 150 kW. A plant is created using the regenerative cycle. the energy can be extracted by pumping the working fluid deep into the ground and through long p
The tank is heated until its pressure is 100 psia. What is (a) the volume of the tank and (b) the amount of heat transfer?
The bases of the boxes, in contact with the floor, have different areas. Both boxes are pushed across the floor. How does the frictional force for the box with a larger base compare to that with a s
Air at 100 kPa and 20oC is compressed to 700 kPa steadily and adiabatically at a rate of 2 kf/s. Determine the power required to compress this air if isentropic compression efficiency is 95 percent.
A 50-kg iron block and a 20-kg copper block, both initially at 80oC, are dropped into a large lake at 15oC. Thermal equilibrium is established after a while as a result of heat transfer between the
Calculate the specific volume for ammonia gas at 450 K and 4000 kPa using (a) ideal gas equation, (b) compressibility chart, and (c) van der Waals equation.
Combustion heats it to 1500 K in a constant-volume process. What is the mass of air, and how high does the pressure become? Draw this process on a T-v diagram and a P-v diagram.
Show states 1, 2, and 3 on a P-v diagram and determine the specific volume at states 1, 2, and 3, as well as the quality at state 2.
A chicken has a mass of 2.2 kg and a specific heat of 3.54 kj/kg*C. The chickens are cooled by water that enters the heat exchanger at 0.5 C and leaves at 2.5 C at a flowrate of 2800 kg/hr.
Argon is compressed in a polytropic process with n = 1.2 from 120 kPa and 30ºC to 1200 kPa in a piston-cylinder device. Determine the work produced and heat transferred during this compression
A Nominal 2 x 8 board, 12 ft long is made of MSR 2250-1.9E lumber and carries a compressive load of 15.5 kip parrellel to the grain.
What is the nominal value for density? Show the equation and show all of your units. What is the corresponding uncertainty associated with density? There will be no uncertainty component for R.
A long pryoceram rod with a diameter of 80mm is clad with a very thin metallic tube for protection. The bonding between the rod and the tube has a thermal contact resistance per unit length of 0.1 m
A mass of 2.4 kg of air at 150 kPa and 12ºC is contained in a gas-tight, frictionless piston-cylinder device. The air is now compressed to a final pressure of 600 kPa.
Assuming the constant specific heats provided, calculate the peak temperature T3 and the rate of thermal energy released in the combustion chamber.
Consider a simple Brayton cycle using air as the working fluid; has a pressure ratio of 12; has a maximum cycle temperature of 600°C; and operates the compressor inlet at 90 kPa and 15°C.
For a velocity field given by V=+0.1xi-0.1yj where x and y are in meters and V is in m/s. Find the equation of the pathline of the particle located at the point x=2, y=8 at t=0.
The structure of a house is such that it loses heat at a rate of 5400 kJ/h per degree Celcius difference between the indoors and outdoors. A heat pump that requires a power input of 6 kW is used to
Find the entropy in a throttling process per unit mass for ammonia. Take the inlet state as specified as saturated liquid(given any pressure). Throttle the ammonia to half that pressure, find the ex
What is the percent change in viscosity per degree celsius for a VG-32 mineral turbine oil at 10C? At 120C? What are the comparable values for an 85W-140 gear oil?