Economic Comparison of Seasonal Heat-Storage in Combination with a Deep Geothermal Doublet with Two Doublets, Example from the Pilot Project in Bern, Switzerland
- Key words
- Seasonal heat-storage, sandstone layers, economic analysis, combination of geothermal heat production from deep wells and heat storage in shallow formations
- Conference
- Asian Geothermal Symposium
- Year
- 2018
- Language
- English
Full text
449KB, opens in a new tab
Abstract
In climate zones with hot summers and cold winters and with geothermal gradients (<= 35°C/km) requiring to drill deep wells (> 3000 m) for district heating at 90-110 °C it may be economically advantageous to construct one well doublet (> 3000 m) together with a seasonal underground heat storage at shallow depth of around 500 m and to operate the system also during summer, instead of constructing two well doublets which operate only in cold months of the year. Of course, such a concept relies on good hydrogeological conditions in the lower deep geothermal reservoir and in the upper storage reservoir. We present the concept and the plans for a pilot project in the city of Bern, being part of HEAT-STORE GEOTHERMICA.
Copyright 2018, Asian Geothermal Symposium. Readers who download papers from this site should honour the copyright of the original authors, and may not copy or distribute the work further without the permission of the original publisher.