Article – Haze reduces GT power output


An interesting article appeared in the pages of the Feb 2008 issue of the Jurutera, the Institution of Engineers, Malaysia’s monthly bulletin. It claims that during the haze season, a gas turbine (GT) can lose as much as 3% of its power output.

For those of you who are not from south east Asia, the haze is a polite term for seasonal smog mostly generated by Indonesia and generously shared with the rest of the region.

To quote the article, written by Engr. Dr Philip Tan, Mr. Loh Tian Ek and Mr. Ng Yan Fu,:

  • ‘The (GT) output reductions could reach as much as 3%.”
  • “However, to our amazement, the additional power loss would recover when the haze is (sic) cleared.”
  • “… hypothesized that during the haze period, the oxygen concentration per volume of air could be lowered.”

The article provides stoichiometric equations demonstrating the effects of lowered oxygen content.

I would say that if the air quality is bad enough to cause a GT to have a reduced power output, pity the lungs of biological machines.

4 Responses to Article – Haze reduces GT power output

  1. Jabba the Hutt says:

    Well, combustion engine (in car) and GT have some commonality.

    Will my car’s efficiency also drop by 3%?

    I hope to my amazement (same as the good doctor) the 3% efficiency will return after the HAZE clear.

    As for the oxygen content, I am using my wife as a gauge… asthma=oxygen content down.

  2. Zorba Desilijic Tiure says:

    I am amazed that such research is done.

    1. When haze arises, obviously, the CO2 concentration increases.
    2. Oxygen content reduce. (Fundamental deduction).
    3. Cars/engine uses turbocharger because (more oxygen more power)
    4. Inversely less oxygen less power

    The comments are;
    1. we do not need to hypothesise that the oxygen will be lower. Rather we KNOW it will be lower.
    2. it can be worked out as part of fundamental thermodynamic calculation any first year physics/engineering student learning basic combustion.

    Dr. Zorba D Tiure
    Combustion Group
    Oxford University

  3. Darth Caedus says:

    So would all combustion engines be affected? This will include car engines, power generation stations, cooking etc. So we would be using 3% more fuel in our cars and also power supply efficiency will drop. With the loss in efficiency won’t more smoke/smog be emitted thus making the smog even worse, and lower the efficiency even more? Is that when TNB will do their costing and raise electricity tariffs by 3% or more?

  4. Wata says:

    I would not argue the good doctor’s explanation that haze brings about a CO concentration increase. Rather, the focus of haze criticisms has been on the health (and other) effects of particulates, and the loss of visibility. This is the first discussion I’ve seen that talks about the effects of oxygen / carbon dioxide / carbon monoxide, and the magnitude of such effects.

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