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Ensaio de colectores solares térmicos: fiabilidade e rendimento

Authors: Forte, Ana Rita Taveira;

Ensaio de colectores solares térmicos: fiabilidade e rendimento

Abstract

Os ensaios de fiabilidade a colectores solares térmicos permitem assegurar que os mesmos são capazes de suportar efeitos adversos, tais como, pressões elevadas no seu interior, degradação por acção da radiação solar, choques térmicos no seu interior ou exterior, degradação do colector pela acção do vento, neve ou granizo, entrada de água e o congelamento do colector. Além disso, os ensaios de rendimento têm como função a determinação do comportamento térmico do colector. Ao longo dos anos estes ensaios têm sofrido alterações, para que simulem as piores condições, sendo o mais fidedignos possível. Como tal, existe uma nova versão proposta para alteração da norma europeia EN 12975:2006. Esta dissertação tem dois objectivos distintos. Um dos objectivos consiste na execução do ensaio de penetração de chuva de acordo com a nova proposta de revisão à actual norma europeia EN 12975:2006. O segundo objectivo consiste na validação de uma ferramenta de cálculo da energia fornecida pelo colector para a latitude de Estocolmo. Ao longo desta dissertação serão apresentados os procedimentos da sequência de ensaio de fiabilidade da actual norma e também da nova proposta de revisão. Para uma melhor compreensão dos ensaios de fiabilidade serão apresentadas as alterações que ocorreram ao longo da existência destes procedimentos de ensaio.

The tests on reliability of the solar thermal collectors allows us to ensure that they are able to withstand adverse effects, such as high pressure inside, degradation by action of solar radiation, thermal shocks inside and outside, degradation of the collector by action of the wind, snow or hail, the entrance of water and the icing of the collector. Besides, the efficiency tests, has the role of determining the thermal behaviour of the collector. Over the years these tests have changed so that they will simulate the worst conditions and became as reliable as possible. As such, there is a new version proposed to amend the rule known as European EN 12975:2006. This dissertation has two distinct objectives. The first objective is to implement a test of rain penetration according to the new proposal to revise the European rule EN 12975:2006. The second objective is the validation of a tool that calculates the energy produced by the collector to the latitude of Stockholm. Throughout this document will be presented the procedures used to develop the tests of reliability for the actual rule and also for the new proposal of amend. For better understanding of the tests on reliability, there will be shown the changes that occurred during the existence of these procedures of test.

Tese de mestrado integrado em Engenharia da Energia e do Ambiente, apresentada à Universidade de Lisboa, através da Faculdade de Ciências, 2011

Country
Portugal
Related Organizations
Keywords

Ensaios de fiabilidade, Norma europeia EN 12975, Rendimento do colector, Teses de mestrado - 2011, Colectores solares térmicos

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
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