Abstract
A physically based model of heat and mass transfer in soil was applied to predict effects of shallow soil heat extraction. The model was tested in a site where the heat extraction rates were 0, 100 and 300 MJm −2yr −1 on three parallel plots. Good agreement was found for both soil temperature and soil temperature depression due to heat extraction. Predictions made covered a spectrum of soil profiles and climatic regimes of Sweden. Start of the growing season and soil temperature sums were found to show the highest sensitivity to heat extraction. Frost heave was not included in the presented results since it is not predicted with certainty by the model. The peat profile investigated diverged considerably from the mineral soils and the risk of permafrost creation was here often critical. The effect of heat extraction could be conceptualized as an apparent northwards transfer of the site. Depending on the depth at which the effect was considered different apparent transfers were obtained. Dependence on preceding extraction rates, depth of extraction, yearly distribution of extraction and snow clearing of the ground was briefly studied. The results are intended as a basis to be used when applying physical and biological criteria in dimensioning of heat extraction plants.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call