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Join Date: Feb 2014
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Gas Turbines

02/06/2014 9:51 PM

What is the effect of air density on the power(MW) of the system. I have heard that in winter season air density is increased so gas turbines generate more MW than in summer season. What is the reason behind it?

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Guru

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#1

Re: Gas Turbines

02/06/2014 9:59 PM

Have you given this any thought? What did you come up with?

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Guru

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#2

Re: Gas Turbines

02/06/2014 10:37 PM

It's the same reason that airplanes, and hot air balloons work better in dense air.

Where did you hear this? Perhaps you should ask the people who told you this.

I have heard that many people do not know of what they speak.

Learn to use a search engine. I have heard that they will set you free.

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Anonymous Poster #2
#7
In reply to #2

Re: Gas Turbines

02/08/2014 1:54 PM

You are a jerk Lyn.

Is this how you guys want to increase the traffic on CR4 ... with jack asses such as yourself giving that kind of reply to users?

You're such a looser ...

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#3

Re: Gas Turbines

02/07/2014 3:12 AM

Greater density = more air = ability to inject more fuel = more MW.

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#9
In reply to #3

Re: Gas Turbines

02/17/2014 3:00 AM

Really great answer. But how more fuel will produce more MW? since speed is constant and remains constant (3000) even more fuel is injected.

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#10
In reply to #9

Re: Gas Turbines

02/17/2014 6:28 AM

More load on turbine = more torque required to turn it = more MW (even at constant speed) = more fuel.

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#4

Re: Gas Turbines

02/07/2014 9:29 AM

Same reason a supercharger or turbocharger works, air density.

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Anonymous Poster #1
#5

Re: Gas Turbines

02/07/2014 1:06 PM

homework?

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#6
In reply to #5

Re: Gas Turbines

02/07/2014 1:44 PM

Get back on your own thread.

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#8

Re: Gas Turbines

02/12/2014 1:07 PM

For same given volume, more pounds/kg put through, think higher mass flow.

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#11

Re: Gas Turbines

02/19/2014 12:24 PM

Allah: All of the current fleet of gas turbines are Brayton cycle engines, and hence output is dependent on mass flow. Also consider that almost all of the energy inefficiency in this cycle is the result of expending energy from the power turbine to drive the compressor, which in the best case is 40%, and in worse cases is 66% (or perhaps even more.

Further observe that the compressor is designed to produce a certain pressure. If one is at X elevation, then the air is less dense based on the barometric equation. If in addition the air is quite hot at X elevation, the density is reduced even further. The compressor must therefore suck in a much larger volume of air to achieve a given mass flow of air (to be mixed with a constant mass of fuel). The compressor must work harder to compress the hot air than it would cool, dense air. Simple and done.

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Allah is great (1); Anonymous Poster (2); bigg (2); James Stewart (1); lyn (1); Spinco (1); texasron (1); Tornado (2)

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