Are you looking for a heat recovery system for low temperature geothermal installations? An ORC offers you a viable solution. Underground temperatures are less influenced by seasonal changes because the ground is an excellent insulator. So, in case of geothermal heat sources, temperatures of the aquifer at a certain depth remain almost constant all year.
Green energy projects
Applications with geothermal heat are known as green energy projects. Applying an ORC in these kinds of projects opens opportunities for green energy production, comparable to wind turbines and solar panels. However, the ORC’s footprint is significantly lower than the footprint of a wind turbine or a field of solar panels (for the same amount of kWh per year).
Recovering heat through a geothermal ORC system requires two circuits:
- PRIMARY CIRCUIT: A geothermal system typically consists of a piping network to pump up the brine from the geothermal wells. After passing a first heat exchanger for recovery of the geothermal heat, the brine is reinjected into the same aquifer in order to create a closed loop circuit. The intermediate heat exchanger insures robustness against the salts and solids of the brine.
- SECONDARY CIRCUIT: Transferring the heat of the geothermal brine to a secondary water loop makes sure the geothermal heat is applicable for multiple purposes. In this case of geothermal heat at lower grade temperatures, the ORC will recover the thermal energy and convert it to electricity. The constant and stable presence of the geothermal aquifer assures maximum operability of the ORC during the year.