Modeling the Profit from Hydropower Plant Energy Generation using Dimensional Analysis

Čarnogurská, Mária; Příhoda, Miroslav; Zeleňáková, Martina; Lázár, Marián; Brestovič, Tomáš

doi:10.15244/pjoes/60159

Cited by 8 publications

(4 citation statements)

References 31 publications

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“…Today it is necessary to move to alternate energy sources that will reduce over-dependence on non-renewable energy sources like fossil fuels. This will definitely be a cost-effective and eco-friendly approach [32][33][34][35][36][37][38][39][40][41][42][43][44][45].…”

Section: Invertase Production Studies At Laboratory Scalementioning

confidence: 99%

Enhancing Profitability of Ethanol Fermentation through Gamma Ray Mutagenesis of Saccharomyces cerevisiae

Arshad¹,

Hussain²,

Chaudhry³

et al. 2018

Pol. J. Environ. Stud.

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World energy consumption is growing at rising rates, facing the progressive depletion of its energetic resources based on non-renewable fuels that also lead to the increase in the generation of polluting gases released into the atmosphere, which have caused changes in the global climate. The solution is to find alternative sources of energy [1]. The use of biomass is an environment friendly way of power generation [2-11]. Ethanol is the main liquid biofuel currently replacing 3% of gasoline. Worldwide, >50% bioethanol is produced from sugarcane juice and molasses. The principal sugar, sucrose, present in the molasses is generally the mostly

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Section: Invertase Production Studies At Laboratory Scalementioning

confidence: 99%

Enhancing Profitability of Ethanol Fermentation through Gamma Ray Mutagenesis of Saccharomyces cerevisiae

Arshad¹,

Hussain²,

Chaudhry³

et al. 2018

Pol. J. Environ. Stud.

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“…To describe a process for which no exact physical equation exists, or if the application of a physical equation is assumed to be problematic, it is advisable to perform an experiment and to generalise its results while applying the laws of similarity. Similar processes that depend on several physical quantities are subject to certain correlations between the similarity constants, which cannot be arbitrarily changed [14][15][16][17][18][19]. Such a condition must also apply to a description of the specific heat loss for directly-buried heat distribution systems.…”

Section: Analysis Of the Problemmentioning

confidence: 99%

A Similarity Model of Specific Heat Loss Determined by Dimensional Analysis

et al. 2023

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This article describes an innovative method for the determination of heat flow (specific heat loss; linear heat flow density) from a one-metre length of a twin pipe directly-buried heat network. Such heat losses are currently described by applying analytical procedures based on the heat transfer theory. It is rather complicated to accurately express the heat loss using such procedures, due to the necessity to determine the individual values of thermal resistance. A simpler method to express heat loss is the balance method, as it requires measuring a temperature gradient Δt between the starting point of the heat network and the end point of the heat collection. A suitable measuring device must provide high-accuracy measurements of the temperature. In the case of very well-insulated distribution pipelines and short pipes, the temperature measurements must be accurate to the hundredths of a degree Celsius. It is impossible to install such devices as fixed equipment on every heat distribution network, due to such networks measuring many kilometres and the cost of the appropriate measuring technology. For the aforesaid reasons, the authors created a mathematical model for specific heat losses based on dimensional analysis. This method facilitates the identification of dimensionless criteria based on the relevant dimensional quantities. Functional correlations between the identified criteria may be identified on the basis of the results of physical or numerical experiments. In this study, a database of the results obtained from physical experiments conducted on two heat networks was used. The output of the similarity model was a function describing the heat flow from a one-meter pipe length that was applicable to various alternatives in relation to the geometrical, physical and boundary conditions. The standard deviation of a difference in the heat losses identified by applying the balance method and using the proposed criterial equation for a twin pipe directly-buried pre-insulated heat network was 0.515 W·m−1.

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“…The advantage of such method is that a relatively extensive group of physical variables influencing a given phenomenon can be reduced to few dimensionless categories -dimensionless arguments [6,7,8,9]. Another advantage is that the functional correlation discovered is universally valid for all other heat distribution systems with geometric and thermal similarity [10].…”

Section: Proposal Of a Mathematical Model Of Heat Lossmentioning

confidence: 99%

Model of heat losses from underground heat distribution system

Čarnogurská

Příhoda

Dobáková

et al. 2017

AIP Conference Proceedings

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The effect of saturated steam vapor temperature on heat consumption in the process of color modification of acacia wood AIP Conference Proceedings 1889, 020006 (2017) Abstract. The paper describes the linear density of the heat flow using dimensional analysis in the case of underground, pre-insulated piping. The methodology makes it possible to determine the heat loss based on a simple criterial relationship. Heat losses in the piping system were also calculated using numerical simulation. The difference between the experimentally detected losses and the values obtained from the model is -3.6% to 6.4%. The results of the numerical simulation at an ambient temperature of 25°C differ from the experiment by -1.7%. At an ambient temperature of -10°C the difference is -4.0%.

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Modeling the Profit from Hydropower Plant Energy Generation using Dimensional Analysis

Cited by 8 publications

References 31 publications

Enhancing Profitability of Ethanol Fermentation through Gamma Ray Mutagenesis of Saccharomyces cerevisiae

Enhancing Profitability of Ethanol Fermentation through Gamma Ray Mutagenesis of Saccharomyces cerevisiae

A Similarity Model of Specific Heat Loss Determined by Dimensional Analysis

Model of heat losses from underground heat distribution system

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