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University of Malta (2019)

Typical meteorological year for solar radiation in Malta

Vella, Marvic

Titre : Typical meteorological year for solar radiation in Malta

Auteur : Vella, Marvic

Université de soutenance : University of Malta

Grade : Master of Science (MS) Sustainable Energy 2019

The availability of accurate data is important for the creation of models used to assess the energy performance of buildings and energy generated by solar systems. However, the collection of long-term meteorological data, such as solar radiation, can be a challenging endeavour. Thus, representative data of different locations, based on historical data can be used to create a typical meteorological year and this can be used reliably in modelling systems and simulating buildings in different software packages. So far, Malta does not have a publicly available Meteorological year for solar radiation. All weather files that are currently used in different software are either based on short-term averages, interpolation between meteorological stations around Malta or approximations based on weather stations in CozzoSpadaro, Sicily, Italy. In this dissertation the typical meteorological solar radiation year is created for Malta, based on three different methodologies. These are the Sandia National laboratory method, the Danish method and the Festa-Ratto method. These three methodologies were applied to eleven years of solar data measured in Malta between 2007 and 2017, both years included. This final result was a set of three different TMYs, which were compared to each other and to the long term average of solar radiation as obtained from measured data. This was done to find out which method produced a TMY that was the most representative of Malta’s yearly solar radiation. Although all three gave results that were close to the long-term average, the TMY generated by the Danish method was deemed to give the best representation. Based on this TMY, it was possible to also calculate the average clearness index and diffuse fraction for Malta. The correlation between them was found by means of a best-fit equation. These two indices depict the ratio of solar radiation that makes it through the atmosphere and the fraction of which is diffuse radiation, respectively. Such correlations can be used to compare the solar climate of Malta to other sites around the world that use this standardised international method.

Présentation (OAR@UM)

Page publiée le 4 mai 2022