Seasonal temperature variation in heat collection liquid used in renewable, carbon-free heat production from urban and rural water areas
University of Vaasa, Faculty of Technology, Electrical Engineering and Energy Technology, Wolffintie 34, FI65200 Vaasa, Finland *Correspondence: Birgitta.Martinkauppi@uva.fi
Abstract:
A renewable energy source called sediment energy is based on heat collection with tubes similar to those used in ground energy and is installed inside a sediment layer under water body. In this paper, an investigation of temperature behaviour of heat carrier liquid is made during several years to evaluate utilization of sediment energy. This is done by evaluating temperature variations of heat carrier liquid and its correlation to air temperature. This increases advancement of knowledge how the temperature of the sediment recovers from the heat collection. The temperature variation of the liquid seems to correlate with the mean monthly air temperature. The selected methods clearly indicate that sediment energy seems to be yearly renewable because there is a clear correlation between air temperature and heat carrier liquid temperature.
Key words:
carbon-free, energy source, heat energy, renewable, sediment energy.