Projektering av småhus med solvärme som huvudkälla

Sammanfattning

In this report a study has been done regarding different heating systems on which are the most

comprehensive with solar heating systems. The report has also been focusing if solar power can be

used as a primary heating source for supplying more than 50 % of the buildings total heating

production. The University of Dalarna constructed a demo-house for this purpose and according to

calculations the total solar usage is more than 50 %. This house has been made for reference

regarding the design of the heating system of property 5:37.

Further studies have been made to compare different heating systems that are compatible with a

solar system, where the compared systems purpose is to be independent of direct using electricity. A

system of this design is regarded as sustainable according to environmental as economic issues. The

following heating systems have been analyzed in combination with solar energy; Geothermal

heating, long- distance heating and bio energy heating.

The result of text study shows that the design of the heating system should be installed with an

accumulation tank as a central component for distribution of heat. The positioning of the house is to

be as to the south as possible and the solar panels should be installed with an elevation of 70

degrees for better use of the spring and autumn sun. Vacuum panels should be installed instead of

plain panels since they have a better utilization factor during spring and autumn.

The efficiency of the accumulator tank is dependent on how well the warm and cold water in the

tank is separated. The water flow circulating the system should be as even as possible with low speed

which keeps the water in the tank separated. Research shows that installing a separate heatexchanger

for the tap water serves for an improved separation of water in the tank.

As a result of the text study the design of the heating system at property 5.37 has been made. Nine

solar panels are to be installed of a total area of 20,7 m

2

and with an 70 degree angle on the

southern roof. Three accumulation tanks with a total volume of 2250 liters have been installed to

store the solar heating energy during longer periods. A separate heat-exchanger for the tap water

has been installed as well.