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  • By waynson ray
    Jul 27, 2009
    # One can already purchase simple-cycle combustion turbines achieving 46% thermal efficiency 1Y0-259 exam. # These are internal-combustion units running on open cycles, requiring neither hot-side nor cold-side heat exchangers. # A turbine using inert gas as a working fluid is not internal combustion, by definition. The source of heat must be something outside the fluid 642-515 exam. If the heat source is combustion, this requires a hot-side heat exchanger. This is an unnecessary capital expense. # Preserving the inert working fluid against loss requires a cold-side heat exchanger SY0-101 exam. This is another unnecessary capital expense for a combustion system. # Reducing the operating temperature from ~1100°C to ~800°C would also reduce the thermal efficiency. If the heat source is combustion, this increases fuel costs. We can see from a relatively simple analysis that today's absence of inert-gas turbine generators has nothing to do with technical feasibility. It is soley a... More > matter of economics. How does a nuclear heat source change the economics? Comparing to the points above: 1. One cannot buy a steam turbine operating at 650°C and higher temperatures RH202 exam. The most feasible option for taking advantage of the high temperature of molten-salt and pebble-bed reactors is gas turbines. 2. The hot-side heat exchanger is either inherent (in a gas-cooled reactor) or required to separate the nuclear materials and the working fluid (molten-salt reactor). 3. Nuclear plants do not chemically modify the working fluid of their heat engines, so are the equivalent of "external combustion". 4. The cold-side heat exchanger is required (like the condenser in a steam turbine). 5. The reduced operating temperature is a given, set by the nuclear heat source. 6. Since the gas turbine can operate at a higher source temperature than a steam turbine and can thus achieve greater thermal efficiency 642-453 exam, it improves the return on the capital investment in the rest of the plant. This reduces costs relative to revenue.< Less
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Product Details

November 30, 2009
Perfect-bound Paperback
Interior Ink
Black & white
0.66 lbs.
Dimensions (inches)
6 wide x 9 tall
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