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DESIGN OF THERMAL SYSTEM IN A SPANISH SINGLE HOUSE
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
2012 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Climate changes produced by human activity and depletion of the non-renewable energy sources make us think better of how the situation of the Earth will be if life styles continue being the same.

In order to stop this trend, countries, such as Spain, have made laws which regulate in the new buildings the limit of energy used, the minimum efficiency of thermal and illumination installations, the minimal contribution of solar energy for DHW[1] and minimal photovoltaic contribution for electricity consumption.

This thesis has carried out a study about the possibility of a thermal system in a Spanish single house situated in Zaragoza, in particular for the purpose of getting the minimal requirements of solar energy contribution to DHW[2]

Firstly, a study of the weather characteristics of different cities in Spain was done and subsequently the minimum requirements set by law were defined. In the case of Zaragoza, the fraction of the DHW supplied by solar collector has to be, at least, 60%.

To reach the minimal contribution imposed, it has been designed in Polysun a thermal system made up of two subsystems based on different resources, one that produced energy by solar collectors, and other one which works as a backup system that uses an auxiliary energy source. Depending on the conditions, the system works on different way. On one hand if the energy obtained by the collectors is not enough to satisfy the DHW demand, the backup system (a gas boiler) starts to work. On the other hand, if  the collectors gain more energy than the energy needed for DHW , this energy is given to the space heating by means of a heat exchanger.

 Once the system has been decided and the target fixed, several design parameters of the system has been analyzed and eventually it has been determined that the suitable system should have the following main characteristics: 6 m2 of collector area with an optimal tilt of 90º, tank 300l of hot water.

The optimal tilt angle is the one with which the maximum useful energy is obtained during the whole year, satisfying the most part of the demand with this system and allowing the shortest backup system with the minimum gas consumption. With this angle the solar system manages a constant support during the year to the DHW, with average values of 87.4 % of the DHW and a peak of 97.4 % in August.

Talking about the energy savings, the solar system allows the boiler being  turned off during the summer months and reduced the energy consumption of it around 2789 kWh per year. That means a reduction of 560 kg of the CO2 emissions and 265.7 Nm3 of gas consumption.

 

[1] Domestic Hot Water

 

Place, publisher, year, edition, pages
2012. , 76 p.
Keyword [en]
Solar collectors, tilt angles, solar thermal system, Spanish standars, energy savings, house simulation, domestic hot demand
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:hig:diva-14795OAI: oai:DiVA.org:hig-14795DiVA: diva2:633951
Subject / course
Energy systems
Educational program
Computer science
Presentation
2013-06-24, 11320, Gävle, 08:13 (English)
Supervisors
Examiners
Available from: 2013-06-28 Created: 2013-06-28 Last updated: 2013-07-24Bibliographically approved

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