energy analysis Articles
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Revisiting rural energy analysis
Rural energy planning is characterised by matching, as far as possible, the available local energy supply with various energy end-uses. For this matching, decision-makers have to consider several issues, such as cost, technology, sustainability and equity. These objectives are conflicting and, therefore, it is difficult to find an optimised solution. Therefore, such problems should be analysed by ...
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Energy Analysis with PROVI ENERGY 3.0
Energy Analysis according to DWA-A 216 New version PROVI ENERGY 3.0 With PROVI ENERGY, the most important results of an energy efficiency analysis according to DWA-A 216 or a potential study according to the municipal directive can be generated automatically at any time from the data of your process control system for a selectable period of time. See PROVI ...
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Statistical Energy Analysis (SEA) for energy attenuation factors and coupling loss factors in asymmetric periodic plates
This paper presents a Statistical Energy Analysis (SEA) to investigate the energy attenuation factors in asymmetric periodic structures. The experimental results are compared with the predicted results obtained by the SEA method. It is found that the attenuations of the base plate and rib plates were hyperbolic in shape. Analytical formulae for the energy at the respective sub-system are also ...
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The European energy outlook to 2010 and 2030
This paper presents a consistent EU energy and energy related emissions outlook for the period to 2030. The baseline scenario for the EU was developed using the PRIMES model. The first section presents the key energy features of the baseline outlook of the European energy system. The second section deals with the role of technology progress in the demand and the supply side. Emphasis is given to ...
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Second-law analysis of two-stage vapour compression refrigeration plants
This paper describes a Second Law Analysis based on experimental data of a two-stage vapour compression facility driven by a compound compressor for medium and low-capacity refrigeration applications, which operates with the most usual inter-stage configurations (direct liquid injection and subcooler). The experimental analysis is performed for an evaporating temperature range between ?36°C and ...
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Energy analysis of manufacturing process of a motorcycle
Energy analysis of a production unit helps to quantify the energy consumed at different stages, thus providing estimates of energy and material wastage, if any. From the general principles of energy analysis involving mass conversion efficiencies and the energy inputs at various stages of the production process of a motorcycle producing industry, namely Honda Motorcycle and Scooter India Pvt. ...
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Multidimensional modelling of the effect of engine load on various exergy terms in an indirect injection diesel engine
In this investigation, the energy and exergy analyses are carried out in a Lister 8.1 IDI diesel engine for different loads (25%, 50%, 75% and full loads operation) at maximum torque engine speed (730 rpm). The energy analysis is done during a closed cycle using of a three dimensional CFD code. The results by this model for the pressure in cylinder at 50% and full load operations are compared ...
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Energy and exergy analyses of a CI engine fuelled with palm biodiesel based on experimental data
Only energy analysis is not enough to define the best efficiencies of any system, so exergy analysis uses to understand and improve the actual efficiencies of the whole system. Energy analysis identified the energy losses but could neither identify the irreversible losses nor their location. These are, however, could be clearly explained with the application of exergy analysis. In this study both ...
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Entropy-energy analysis of forced convection in a porous-saturated circular tube considering temperature-dependent viscosity effects
The temperature-dependent viscosity effect on forced convection in a circular tube filled with a porous medium is investigated theoretically. The Darcy flow model is employed and the viscosity-temperature behaviour is described by an inverse-linear model. It is found that the effect of the variation impacts the Nusselt number significantly while the pressure drop was not influenced that much. ...
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Spatial model for wood energy analysis
Fuelwood is one of the major fuels for rural households and cottage industries in developing countries. Most of the fuelwood consumed in rural areas come from nearby forests. The estimates on the availability of fuelwood are based on gross national estimates and may not reflect the local conditions. As a result, planning for wood energy supply and consumption becomes an ad hoc process. In this ...
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BIM becomes top priority with increasing energy costs
Using Building Information Modelling for energy analysis can save a company a significant amount of time and money, reports ...
By Vital Energi
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Afterburning effect on the energetic and exergetic performance of an experimental turbojet engine (TJE)
This study presents the afterburning effect on energetic and exergetic performance of an experimental turbojet engine (TJE) used on military aircrafts. Energy losses and exergy consumptions are investigated to determine thermodynamic inefficiencies at military (MIL) and afterburner (AB) operation modes. Results of this study point out that the AB operation mode decreases the energy and exergy ...
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Energy analysis of Brayton combined cycles
Economic and environmental considerations dictate the need for improved fuel utilisation in thermal power stations. To meet this goal, a design project was undertaken to assess the suitability for Combined Cycle application of different Gas Turbine (GT) cycles: Simple, Intercooled, Reheated, Intercooled/Reheated, Intercooled/Reheated/Regenerative cycle. Comparative figures for efficiency and ...
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Technology dynamics in energy systems models with perfect foresight
This article provides a tutorial on how to implement technology dynamics in global optimisation energy models that are widely used for energy systems analysis. The tutorial draws from a series of modelling experiments conducted by several research groups cooperating in the framework of European Union research. The paper expands on issues associating endogenous learning of technologies and model ...
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Energy and exergy analyses in a thermal process of a production line for a cement factory and applications
The objective of this study is to determine the actual energy losses by performing energy and exergy analyses and to evaluate energy and exergy efficiency in each process for the cement factory. In these analyses, for each process energy and exergy diagrams have been constituted on the production line. Efficiencies (energy/exergetic) of the processes for the raw mill, the rotary kiln, the trass ...
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Analysis of energy and exergy use in the Jordanian urban residential sector
This study presents an analysis of the energy and exergy utilisation of the Jordanian urban residential sector by considering the flows of energy and exergy through the main end uses and applications in Jordanian households. To achieve this purpose, a survey covering 200 households was conducted and energy consumption data were gathered. Exergy analysis of Jordanian urban residential sector ...
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Thermodynamic analysis of chimney
Thermodynamic analysis, including energy and exergy, was applied for studying a chimney phenomenon. The mathematical model of a chimney was derived and used for evaluation of output trends responsive to change of some input parameters. It was proposed to use chimney efficiency as a measure of waste heat recovery. Also, the new component of exergy of the substance, called mechanical exergy, was ...
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A review on exergetic analysis and assessment of various types of engines
This study presents a review on energy and exergy analysis of Otto and Diesel engines. Calculation methods of the analysis are discussed in detail. Previous studies, from 1963 to 2008, are chronologically listed and studied. The test engines had different cylinder numbers, speeds and rated powers. Engine specifications and test bench schematics are given in tables and figures. The best exergetic ...
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Entropy-energy analysis of porous stack: steady state conjugate problem
We have performed analytical and limited numerical analyses for fully developed forced convection and entropy generation in a fluid-saturated porous medium channel bounded by two parallel plates of finite thickness. The full problem is treated as a conjugate heat transfer problem. The Darcy-Brinkman momentum equation is used to model the flow through the porous media. The outer surfaces of the ...
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Experience curves for wind power
The objective of this study was to improve the understanding of the use of different experience curves in energy analysis. The study was based on the application of experience curves to wind power systems, but the approach is generic and can be used in other energy technologies. In the study, experience curves for wind power were developed, and it has been demonstrated that different types of ...
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