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1.
Economic analysis of geothermal heat source for residential area project
Sašo Poberžnik, Darko Goričanec, Jurij Krope, 2007, izvirni znanstveni članek

Opis: The article discusses the economic analysis of heat source for residential area project. The energy source is geothermal energy. Every house has its own borehole heat exchanger (BHE) and heat pump in basement. In this system low temperature floor and wall heating was carried out. The economic analysis was performed as a pilot study for real system with all installation needed to runthe system. The analysis has been done using the method of the net present value. In the research the coefficient of profitability and the period of timein which the investment is going to return itself were established. The system has been compared to the conventional system that uses fossil fuel (Liquidized naphtha gas- LNG) to heat the building and domestic hot water.
Ključne besede: geothermal heat, area projects, borehole heat exchanger, economic analysis
Objavljeno: 31.05.2012; Ogledov: 756; Prenosov: 8
URL Polno besedilo (0,00 KB)

2.
Heat integration in a speciality product process
Majda Krajnc, Anita Kovač Kralj, Peter Glavič, 2006, izvirni znanstveni članek

Opis: The essence of effective process designing is to use methods which are efficient to engineers in practice and not only to scientists. The proposed design procedure is composed of two steps: conceptual one and optimization one. At the conceptual step, pinch design analysis is used. In the optimization step pinch analysis and mixed-integer nonlinear programming method are applied. In the case study analysed, a speciality product is to beproduced in continuous chemical process with a capacity which causes smallerheat flow rates and needs smaller heat exchanger areas than usual. Therefore, an equation for cost estimation of heat exchangers with areas smaller than 7 m2 was developed and used in the optimization procedure. Using thermodynamic pinch analysis and mathematical programming method, the heat integrated structures were synthesized and compared with the base process flowsheet. Finally, the optimal structure was determined.
Ključne besede: načrtovanje procesov, načrtovanje procesov, ekonomska analiza, prenos toplote, optimizacija, chemical process design, economic analysis, heat integration, optimization
Objavljeno: 30.05.2012; Ogledov: 970; Prenosov: 3
URL Polno besedilo (0,00 KB)

3.
Analysis of two-stage high- temperature heat pump efficiency
G. Tadić, Milovan Jotanović, Jurij Krope, Darko Goričanec, 2012, izvirni znanstveni članek

Opis: The paper shows the potential benefit of using low temperature heat sources with high temperature pumps. Two-stage heat pumps with flash unit and heat exchanger are described. To determine the characteristic parameters of the twoheat pumps a computer program was designed, with which we could determine the dependence of COP and compressor pressure ratios from evaporating temperature. An economic analysis of the justification of the use of heat pumps was made.
Ključne besede: heat transfer, high temperature heat pumps, computer programme, economic analysis
Objavljeno: 10.07.2015; Ogledov: 418; Prenosov: 9
URL Polno besedilo (0,00 KB)

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Geothermal heat potential - the source for heating greenhouses in Southestern Europe
Danijela Doberšek, Peter Trop, Darko Goričanec, 2016, izvirni znanstveni članek

Opis: The paper presents economically evaluated solutions for heating greenhouses with geothermal potential, if the same greenhouse is placed in two different locations in Southeastern Europe, one in Slovenia and the other in Serbia. The direct geothermal water exploitation using heat exchangers is presented and the remaining heat potential of already used geothermal water is exploited using high temperature heat pumps. Energy demands for heating greenhouses are calculated considering climatic parameters of both locations. Furthermore, different constructions materials are taken into account, and energy demands are evaluated if the same greenhouse is made of 4 mm toughened single glass, double insulated glass or polycarbonate plates. The results show that the geothermal energy usage is economically feasible in both locations, because payback periods are in range from two to almost eight years for different scenarios.
Ključne besede: geothermal heat exploitation, greenhouses energy demands, high temperature heat pump, economic analysis
Objavljeno: 07.07.2017; Ogledov: 69; Prenosov: 3
.pdf Polno besedilo (1,02 MB)

6.
Underground coal gasification - the Velenje coal mine energy and economic calculations
Damjan Konovšek, Zdravko Praunseis, Jurij Avsec, Gorazd Berčič, Andrej Pohar, Simon Zavšek, Milan Medved, 2017, izvirni znanstveni članek

Opis: Underground coal gasification (UCG) is a viable possibility for the exploitation of vast coal deposits that are unreachable by conventional mining and can meet the energy, economic and environmental demands of the 21st century. Due to the complexity of the process, and the site-specific coal and seam properties, it is important to acknowledge all the available data and past experiences, in order to conduct a successful UCG operation. Slovenia has huge unmined reserves of coal, and therefore offers the possibility of an alternative use of this domestic primary energy source. According to the available underground coal gasification technology, the energy and economic assessment for the exploitation of coal to generate electricity and heat was made. A new procedure for the estimation of the energy efficiency of the coal gasification process, which is also used to compare the energy analyses for different examples of coal exploitation, was proposed, as well as the technological schemes and plant operating mode in Velenje, and the use of produced synthetic coal gas (syngas). The proposed location for the pilot demonstration experiment in Velenje Coal Mine was reviewed and the viability of the underground coal gasification project in Velenje was determined.
Ključne besede: underground coal gasification, syngas, clean coal technology, energy analysis, economic analysis
Objavljeno: 31.08.2017; Ogledov: 133; Prenosov: 17
.pdf Polno besedilo (1,32 MB)

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