1. Centre for Renewable Energy Systems Technology (CREST), School of Electronic, Electrical and System Engineering; Loughborough University; Leicestershire LE11 3TU UK
2. European Commission; Joint Research Centre, Institute for Energy and Transport, Renewable Energy Unit; I-21027 Ispra VA Italy
3. Kuwait Institute for Scientific Research (KISR); Building and Energy Technologies Department; PO Box 24885 Safat 13109 Kuwait