1,721,248 research outputs found
L’autoproduzione e la cogenerazione nel contesto del sistema energetico nazionale. L’integrazione della cogenerazione e delle fonti energetiche rinnovabili in un sistema energetico complesso
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Optimization of Modular Compact Heat Exchanger for Heat Recovery Steam Generator
No full textIn the present work the use of a particular kind of non conventional plate-fin heat exchanger (PFHE), inspired
to the cross-flow heat exchangers as basic element of hear recovery steam generators (HRSG), is analysed.. The
new concept of heat exchanger, as recently proposed in the literature, can be interesting as modular solution, to
increase efficiencies and to reduce the dimensions of HRSG by means of various packaging solutions.
Basing on this particular HRSG structure concept, a mathematical model is devised to predict the heat transfer
and the performances of the HRSG and of the single section and an optimum design strategy has been outlined.
The optimization procedure is concentrated on the gas side finned surface and is articulated in two different steps.
A first step aimed to the minimization of the pressure losses for a given heat flow or to the maximization of the
heat flow for a given value of the pressure losses. The second step permits a reduction of the weight for imposed
HRSG performance. The procedure is tested on a basic 1.5 MW HRSG structur
Fonti rinnovabili, eco-efficienza, energia nucleare, idrogeno, zero emissioni: quali soluzioni per la questione energetica?
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Natural gas consumption and correlation with the uses of thermal energy: Analysis of the Italian case
Full text linkIn this paper, after a brief review of the methodologies proposed in the literature for the forecasting of heat load and thermal energy consumption, a specific analysis of the trends of natural gas consumption applied to the Italian case. Italy is a country in which the use of natural gas can be mainly connected to the uses of thermal energy for heating purposes. The natural gas consumption data are analyzed characterised and clustered referring to the last four years (2012-2015). The dependence of the typical Italian consumption profile in different days of the week, in different seasons and for the different users are analyzed: residential/civil, industrial and use referred to thermoelectric power plants are in particular analyzed. The analysis of the data shows that natural gas consumption profile is mainly related to seasonality pattern and to the weather conditions (in particular temperature below 15 °C) for the civil/residential sector, but it is shown that there is also an important daily pattern both related to industrial and civil energy consumption that, at a lower degree than the previous one, does affect the consumption profile and have to be taken into account for defining an effective short and mid term thermal energy forecasting method. A possible mathematical structure of the natural gas consumption profile is proposed. Due to the strong link between thermal energy use, mainly connected to heating purposes, and natural gas consumption this analysis could be considered the first step for the development of a model for thermal energy forecasting
Perspectives for efficiency increase of combined cycle plants based on the use of supercritical HRSG
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