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An air standard diesel cycle has a compression ratio of 20 and the heat transferred to the working fluid per cycle is 1800 kJ/kg. At the beginning of the compression process, the pressure is 0.1 MPa
A brake system applies a resistive torque of 25 N. How many revolutions will occur if a 300 kg solid wheel of diameter 0.25 m is slowed from 300 rpm to 0 rpm?
Two Carnot engines operate in series such that the heat rejected from one is the heat input to the other. The heat rejected from the high temperature reservoir is 500 kJ.
A compressor receives air at 95kPa and 250C at low velocity. At the exit of the compressor, air discharges at 1.52MPa and 4300C with a velocity of 80m/s.
Superheated ammonia enters an insulated nozzle at 200C and 800kPa. The flow through the low velocity inlet is at 0.015kg/s. At the discharge, the ammonia exits at 280kPa with a velocity of 400m/s.
A Centrifugal pump can provide a 20-m head rise at 75 rev/min. If the rotation speed increases to 90 rev/min, what will be the head rise? Note the pump runs under dynamically similar conditions.
Consider a house whose walls are 4 m high and 12 m long. Two of the walls of the house have no windows, while each of the other two walls has four wndows made of 0.6-cm-thick glass (k=0.78 W/m*C), 1
Find the entropy production rate for the nozzle. The exit velocity for a reversible and adiabatic nozzle and find the nozzle isentropic efficiency.
IF you can neglect the potential energy effects, the inlet velocity is 100 m/sec and the ratio of the outlet area to the inlet area is 4, WHAT is the power output of the turbine for a mass flow rate
Nitrogen gas at steady-state-steady-flow undergoes a compression provess through a well-insulated compressor. The inlet pressure and temperature are 100 kPa and 300K THe exit pressure is 1500 kOa. T
Argon gas flows through a rigid nozzle at steady-state-steady flow. The inlet flow velocity is small. THe gas exits the nozzle at 450 m/s with mass flowrate of 88 kg/s and exit area of .10 m^2/ Heat
Estimate the net power output of the plant, in Btu/h if the pumps used to circulate seawater through the evaporator and condenser heat exchangers require a total power input of 2.55 X 108 Btu/h.
Describe fully what happens when you cools down a melt of 40mol% Nio-60mol% Mgo. Give the compositions of the phases and their relative amount for at least three temperatures in the two phase field
10 mol/s of liquid benzene at 20°C and 1 bar is pumped to 5 bar. At the inlet conditions, the molar volume of benzene is 11.8 liter/mol. Estimate the outlet temperature of the benzene and the w
Liquid water enters a 25-kW pump at 100kPa pressure at a rate of 5kg/s. Determine the highest pressure the liquid water can have at the exit of the pump. Neglect the kinetic and potential energy ch
Approximately 250 mol of an ideal gas expands adiabatically and irreversibly from 2 m3 to 5 m3 against a constant restraining force of 100 kPa. Initially, the temperature and pressure of the gas are
A 31-L electric radiator containing heating oil is placed in a 48-m3 room. The room and the radiator oil are initially at 14 °C. The barometric pressure in the room is initially 745 mm-Hg. The r
Warm air is contained in a piston-and-cylinder device oriented horizontally, as shown below. The air cools slowly from an initial volume of 0.003 m3 to a final volume of 0.002 m3.
A double pipe heat exchanger serves as an oil cooler with oil flowing in one direction through the inner tube and cooling water in the opposite direction through the annulus.
Refrigerant 134a at a rate of 0.8 lb/s enters a compressor operating at steady state as saturated vapor at 30 psia and exits at a pressure of 160 psia. There is no significant heat transfer with the
The reservoir pressure and temperature for a blowdown supersonic wind tunnel are 7.5 atm and 800 deg R, respectively. The design Mach number for the tunnel is Mdes = 3.5.
1kg of water that is initially at 90 degree celsius with a quality of 10 percent occupies a (linear) spring-loaded piston-cylinder device. Heating raises the pressure to 800kPa and temperature to 25
A 3-stroke cycle is executed in a closed system with 1 kg of air, and it consists of the following three processes: (a) Isentropic compression from 100 kPa, 300 K to 800 kPa. (b) p=constant heat add
A household refrigerator with a COP of 1.2 removes heat from the refrigerated space at a rate of 60 kJ/min. Determine (a) the electric power consumed by the refrigerator and (b) the rate of heat tr
An adiabatic turbine expands steam from 500C , 3.5 Mpa to 200C and 0.3MPa . if the turbine generates 750 kw. what is the flow rate of steam through the turbine ?