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Determine the rate of heat loss from the turbine to 3 significant figures in kW. Assume the inlet/outlet kinetic and potential energy changes are negligible.
How condenser can increase the power developed? And what is back pressure how it will effect the plant efficiency and how the vaccum will increase the power developed by turbine?
Water at 20 bar, 400°C enters a turbine operating at steady state and exits at 1.5 bar. Stray heat transfer and kinetic and potential energy effects are negligible. A hard-to-read data sheet ind
Emitting beta particles with an average energy of 5.37 MeV/decay) at a concentration of 2.3pCi/L. What is the air-kerma rate (Gy/h)?
A residential air-conditioner with COP of 4.0 re-circulates 0.4 kg-DA/s of indoor air that is cooled and dehumidified as it flows over the cooling coil. THe warm indoor enters the unit at 30 C with
Assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. specific heats at room temperature.
Consider axial viscous flow in a long annular pipe driven by a pressure gradient with an inner solid rod of radius Ri. Determine the wall shear stress, tau, acting on the inner and outer walls.
A hydraulic jump at the base of a spillway of a dam is such that the depths upstream and downstream of the jump are 0.90 and 3.6m, respectively.
Air is expanded from 2000 kPa and 500C to 100kPa and 50C. Assuming constant specific heats, determine the change in specific entropy of air.
Hydrogen at 25 bar, 450°C enters an adiabatic turbine and expands to 2 bar, 160°C with a mass flow rate of 0.2 kg/s. For a dead state of To= 25°C, Po = 1 atm determine the exergetic effi
An orifice meter is to be installed in a 12-in ductile iron pipe carrying water at 60°F. A mercury manomoter is to be used to measure the pressure difference across the orifice when the expected
Neglecting the kinetic and potential energy changes between inlet and exit, is it possible that the compressor operates as claimed?
A heat pump with refrigerant 134-a, as the working fluid is used to keep a space at 25C by absorbing heat from geothermal water that enters the evaporator at 50C at a rate of .065kg/s and leaves at
Air (an ideal gas) contained in a rigid, insulated tank fitted with a paddle wheel, initially at 27 degrees celcius. Determine the amount of entropy produced (kJ/K) assuming variable specific heats.
Consider a front loader washer that weighs 200 lb with a 6 lb towels. The size of the drum is 0.4 m. During a spin cycle, the drum speeds from 0 to the operating speed of 700 rpm. Model the towels a
The average temperature of the stream passing through the boiler is 460 degrees celcius. What is the minimum theoretical rate at which energy could be discharged to the cooling water (MW)?
A gas turbine power plant operates on the simple brayton cycle between the pressure limits of 100 and 800 kPa.Air enters the compressor at 30 C and leaves at 330 C at a mass flow rate of 200 kg/s.
Discuss the concept of then having rough surfaces to reduce slipping (such as the differences between a waxed tile floor, concrete, and textured concrete (no calculations needed here).
Consider the combustion of butane (C4H10) in the gas phase with the theoretical amount of air. The products and reactants remain at 25 C and 1 atm. Find the enthalpy of combustion in kJ/kg of fuel f
Electricity can be directly used to heat a home by passing an electric current through a heating coil. This is a direct, 100% conversion of work to heat.
Calculate the maximum mass flow rate at the inlet condition that this compressor can handle without violating the second law of thermodynamics.
An axial flow compressor stage has blade root,mean and tip velocities of 150,200 and 250 m/s. The stage is to be designed for a stagnation temperature rise of 20K and axial velocity of 150 m/s, both
Nitrogen gas enters an adiabatic nozzle with negligible velocity, 300 kPa, 800 K and exits at 200 m/s. For a nozzle isentropic efficiency of 80%, calculate the exit temperature (K).
If the horizontal duct is uninsulated and exposed to air at 35 C in the crawl space beneath a home, what is the heat gain per unit length of the duct?
Determine the amount of excavation needed for the basement. A 2 foot working distance is required and the excavation will be sloped 1.5:1.