On the maximum efficiency of a long transmission line

Papazoglou, T.M.

doi:10.1016/0142-0615(90)90024-6

Cited by 7 publications

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“…The highest power energy efficiency belongs to large combined-cycle cogeneration (47−55%) . A study by Papazoglou shows that actual transmission efficiencies can reach 91% for a 100% power factor. Hence, the combined plant and transmission power energy efficiency can be estimated to range from 20.9−23.7% to 42.8−50.0%.…”

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confidence: 99%

Efficiency Analysis of Natural Gas Residential Micro-cogeneration Systems

2010

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Many micro-combined heat and power (micro-CHP) technologies have emerged in the residential market in the recent years. However, the selection of a particular micro-CHP system for an application and investigating the trade-offs between micro-CHP and centralized power remain a problem. The present analysis compares three micro-CHP systems on the basis of energy, exergy, and marginal efficiencies. The systems feature different energy conversion technologies: Stirling engine (WhisperGen), spark-ignition internal combustion (IC) engine (FreeWatt), and polymer electrolyte fuel cell (PEFC) (EBARA Ballard). These systems are fueled by natural gas and produce power and heat for residential applications. The analysis suggests that the IC system provides the highest energy and exergy efficiencies at higher heat use (η energy = 76.7%, η exergy = 57.2%, and f = 0.71), while the PEFC operates at higher energy and exergy efficiencies at lower heat use (η energy > 29.0%, η exergy > 32.0%, and f > 0.00). The PEFC system exhibits the greatest marginal efficiency at any heat use (η marginal >32.0% and f>0.00). Other important issues such as price, maintenance, noise, and emissions are discussed. The Stirling engine is the least expensive that requires the least maintenance. The fuel cell is the least noisy system with the least amount of emissions.

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Section: Resultsmentioning

confidence: 99%

Efficiency Analysis of Natural Gas Residential Micro-cogeneration Systems

2010

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Optimum size of thermal power stations

Sodha

Chandra

1992

Int. J. Energy Res.

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It is well known that the price per unit of generated electrical energy decreases with increasing size of the generator, which implies longer transmission lines and hence larger transmission losses. Considering both these facts, the optimum size of a thermal power station has been obtained by using life‐cycle costing analysis; the demand is proposed to be met by a base load generator and a peak load generator. The dependence of the investment ratio (the ratio of present worth of net income to the capital investment) on relevant parameters has been studied. It is seen that there exist optimum sizes of base load generator and peak load generator of a power station, for a given load density. The effect of electricity price, coal price and escalation rates on the optimum sizes has also been investigated. The analysis has been made for constant demand as well as for growing demand. The effect of the ratio of base load to peak load on the economics has also been investigated. The cost data from a recent study in India have been used.

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Optimum size of base load generators for growing demand

Sodha

Chandra

Rana

1994

Int. J. Energy Res.

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The price per unit generated electrical energy decreases with increasing size of the generator, which implies longer transmission line and hence larger transmission losses. Considering both these facts the optimum size of thermal power station for growing demand has been obtained by using life‐cycle costing analysis. The demand may be met by (1) a combination of base load and peak load generators (Sodha and Chandra, 1992) and (2) by a combination of base load generators only. The second option has been analysed in this paper. The dependence of investment ratio (the ratio of present worth of net income to the capital investment) on relevant parameters has been studied. It is seen that there exists a particular pattern (optimum combination) of base load generators. The effect of electricity price, coal price and escalation rates on the optimum configuration has also been investigated. The cost data from recent study in India have been used.

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On the maximum efficiency of a long transmission line

Cited by 7 publications

References 0 publications

Efficiency Analysis of Natural Gas Residential Micro-cogeneration Systems

Efficiency Analysis of Natural Gas Residential Micro-cogeneration Systems

Optimum size of thermal power stations

Optimum size of base load generators for growing demand

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