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DESIGN OF A SOLAR WATER HEATING SYSTEM IN A RESIDENTIAL BUILDING

by Sánchez Herranz, Daniel

Abstract (Summary)
One way to reduce CO2 emissions, help to the global sustainable development and reduce the global warming is the use of clean and renewable energies. One of them is the solar energy, in fact this is one of the natural sources with more energetic potential. Due to this several prestigious entities and governments are promoting and improving the development and use of this kind of energy. For example, the Spanish government approved a law in March of 2006, named “Código Técnico de la Edificación”. This regulation is mandatory, and set the minimum quality requirements that residential buildings must have. One of them forces that new and renovated buildings have to produce part the energy demand for heating water by means of a solar thermal system. The project is going to be carried out in an old building which is being renovated. The aim of this thesis is to design and calculate the installation of a solar system for covering part of the sanitary hot water in a residential building placed in Zaragoza, Spain. The calculation includes dimension the system, to select the components and to obtain the solar annual coverage. After this, check that the obtained solar annual coverage is greater than the minimum one set by the law. The obtained results are the energy, fuel and money saves, as well as the initial investment and the payback of the installation. The system can be divided in main and secondary elements, this thesis is only focused in calculate and dimension the main ones. The size of the elements and the selected components are the following ones: - 34 flat plate collectors, model Vitosol 300F with 2,3 m2 of absorbent surface. - 7 accumulators, model Vitocell 100V with capacity for 1000 liters. - 1 natural gas boiler, model Vitogas 200F with a power of 29 KW. Installing these elements the results obtained are quite satisfactory, the obtained solar annual coverage, 66,22% is greater than the minimum needed in this project, 65%. The energy and fuel saves reach a value of 66,23%. This carries a money saves of 55,95%, equivalent to 2.846,31 €/year. The CO2 emissions reduction is also quite serious, 13.783,21 Kg/year. II The total initial investment cost of the installation, including main and secondary equipment and the installation of the system, is 62.160 €. This amount is divided between the sixty six flats of the building, therefore each flat is paying 941,82 €. Finally, the payback of the installation is 21,83 years, more or less the life period of the system. So the initial investment money is retuning back along the life period, predicted and guaranteed by manufactures between twenty and twenty five years. III
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Advisor:

School:Högskolan i Gävle

School Location:Sweden

Source Type:Master's Thesis

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Date of Publication:01/01/2009

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