Solenergi och värmelagring i kvarteret Lagern
Humanity stands before a huge challenge to lower its emissions of carbon dioxide and its use of energy at the same time as the global population is rising and the developing countries are being industrialized. A lot of newly built buildings are due to this challenge, designed to be more energy efficient but also use renewable energy resources instead of pollutant fossil fuels .Solar energy is one of the purest forms of energy that exists in abundant amounts, which is why it is most likely that it could come to play a major part in the future energy market. The main purpose of this report is to investigate the possibility to implement a sustainable energy system with solar thermal heat and heat storage as main sources of energy in the neighborhood ?kvarteret Lagern?, which is the area where the old football stadium ?Rasunda Stadion? was located. New developments within different heat storage techniques have opened up new approaches to enable buildings an all year round heat supply from solar energy. This report will focus on heat storage in boreholes. At the present here is only a preliminary plan of how the neighborhood is supposed to be designed. This plan has been used in all the calculations regarding the potential areas where solar collectors and a heat Storage system could be integrated. The solar collector area has been maximized according to these conditions to be able to maximize the use of solar energy in ?kvarteret Lagern?. The results show that the energy from the solar collectors would supply the total demand of heat energy during May to September, where the potential heat excess would be stored in the boreholes to be extracted and used during the winter. The heat storage system that has been designed for ?kvarteret Lagern? consists of 36 boreholes. The borehole system has the potential to store 977 MWh per year where the heat losses are estimated to be around 44 percent. The heat excess that would be stored during the summers will enable 611 MWh of heat to be extracted and used from the boreholes during the winter. The result of the economic calculations and the sensitivity analysis show that an implementation of this type of energy system in ?kvarteret Lagern?, would lead to positive net present values and therefore be a profitable investment. They also show that the payback time is significantly shorter than the lifetime period of the solar collectors.