Thermodynamics, engineering, Other Engineering

Assignment Help:
A methane-fired microturbine based on the regenerative gas turbine cycle employs a centrifugal compressor with a polytropic efficiency of 85%, a radial inflow turbine with a polytropic efficiency of 87% and a recuperator with an effectiveness of 0.75. The pres-sure loss is 10% divided equally between the high- and low-pressure sides. To avoid the use of exotic materials in the hot section, the combustor was limited to an equiva-lence ratio of 0.2, with a resulting combustor exit temperature of 1200K when the com-pressor inlet temperature is 298K. The working fluid can be assumed to be air with k = 1.4 with a cp = 1.025 kJ/kg-K in the compressor, 1.050 kJ/kg-K on both sides of the re-cuperator, and 1.075 kJ/kg-K in the combustor and turbine. The fuel is available as a gas at atmospheric pressure and 298K and must be pumped to a pressure that is 10% higher than the combustor exit pressure using a small compressor whose adiabatic efficiency is 60% (this is parasitic power to be subtracted from engine output). The specific heat, cp, of methane is 2.35 kJ/kg-K, and its k = 1.28. The combined mechanical and electrical efficiency of the turbine and the electric generator is 90%. If the compressor pressure ratio is 5:1, and the net power output is 500 kWe, compute the overall efficiency of the turbo-generator set, accounting for mechanical, electric and parasitic losses. Calculate the air and fuel flow rates under these conditions and estimate the exergy efficiency of the combustor, accounting for the methane pumping parasitic power.

Related Discussions:- Thermodynamics, engineering

Plane transmission diffraction grating, A diffraction grating is an optical...

A diffraction grating is an optical element that diffracts light into its constituent wavelength (colors). It is an excellent device used in laboratory to study the spectra. Co

Thermodynamics, Air at 1bar and 30 degreeC is to be compressed to 1.2 bar a...

Air at 1bar and 30 degreeC is to be compressed to 1.2 bar at the rate of 50m3/min. find the power required by a roofs blower.

Chvorinov''s rule, Q. Why is it desirable to design a casting to have direc...

Q. Why is it desirable to design a casting to have directional solidification sweeping from the extremities of the mould to riser based on Chvorinov's rule? What would be an ideal

Techniques of capital budgeting, Techniques of capital budgeting There are ...

Techniques of capital budgeting There are a number of capital budgeting techniques used in the evaluation of a project. They are broadly classified under two categories: 1] Discoun

CDMA, In a CDMA system, the signal is spread over a large bandwi...

In a CDMA system, the signal is spread over a large bandwidth by multiplying the transmitted symbol by a sequence of short pulses, also called chips. The

Electrometallurgy, explain electrometallurgy for metal extraction process u...

explain electrometallurgy for metal extraction process using a schematic diagram

Determine payback and npv, Payback & NPV Julia Corp. is in the business o...

Payback & NPV Julia Corp. is in the business of making sugar cookies. The company is considering the purchase of a new cookie making machine which will improve its manufacturing

Working of i.c. engine, WORKING OF I.C. ENGINE Basically there are 2 ty...

WORKING OF I.C. ENGINE Basically there are 2 types of internal combustion engines; the two stoke type and the 4-stroke type. A brief description of these is given below: 1.

High rise buildings - fire protection engineering, High rise buildings: ...

High rise buildings: High rise buildings have their own particular requirements for fire safety and for fire fighting.  Means of escape rely on most people descending the stai

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd