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| Fri, 22nd May 2020 13:23:00 |
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Borehole thermal energy storage for solar |
The municipality of Drammen, Norway, has started testing a seasonal PV storage project that uses boreholes in the ground. The operators of the project are using electricity from PV modules to produce heat via a CO2 heat pump and outdoor air. The heat is produced by the CO2 pump during the spring, summer and fall, in addition to heat produced by solar thermal collectors.
Drammen Eiendom KF – a company owned by the municipality of Drammen, Norway – has developed a project to store solar energy as heat. The system can store energy provided by 150 m2 of solar thermal collectors and 1,000 m2 of PV panels in 100 boreholes in granitic gneiss rock, each with a depth of approximately 50 meters.
"GeoTermos is expected to return around 350,000 kWh/year in the form of heat at various temperature levels during the heating season," said Randi Kalskin Ramstad, a shallow geothermal energy and hydrogeology specialist at the Norwegian University of Science and Technology (NTNU) and engineering services provider Asplan Viak.
The electricity provided by the PV installation produces heat by using air as a heat source for the CO2 heat pump. The heat is then stored in the boreholes during the spring, summer and fall. In the winter, it is used for low-temperature heating in a number of nearby school buildings.
"The system performance of the energy system is quite high," Kalskin Ramstad told pv magazine. "The operation of the plant has now just started, with heat charging of the boreholes."
Water is used as a collector fluid in the boreholes, which provides several advantages compared to glycol-based collector liquid, including lower viscosity, better thermal properties, and lower costs. It is also environmentally friendly.
The GeoTermos system – with energy storage, a heat pump, and an accumulation tank – is able to provide approximately 300 kW of heat power for short periods during peak load, and is regulated by the temperature levels and heat power demands.
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