Procedure for Open Loop Geothermal System
Stage 1: Preliminary study-Total Cost
- Visit to the site of project- data collection.
- Topographical
- Building Load Calculations (if exists)
- Geological formations of the application area
2) Preliminary study which includes:
- Data analysis project description.
- Assessment of the geology at study area includes Geological section.
- Initial system design and dimensioning of its individual elements.
- Detailed description of the system and its installation process.
- All stages of the project with detailed costs.
- Financial feasibility study of the project and its payback period.
Stage 2: Issue of Permit (in Greece)
- Collections of supporting documents for the issuance of the permit of install geothermal system.
- Completing the file and submitting it for the issuance of the permit (2-3 months usually).
- Issuance of the permit and installation of the geothermal system under our supervision (includes issuance of a paravolo (GR) from a financial cost of 300 euro).
Stage 3: Final Design - Project supervision-Procedure for the installation of the geothermal system (under our supervision)
- Drilling of boreholes or well construction (includes wellbore cleaning and test pumping by the well manufacturer)
- Take a water sample and send it for chemical analysis (included in the cost of the study for permit)
- Simulation of the geothermal system to verify it’s completeness
- Final system design which results from wells flow testing data and the chemical analysis of the water
- Supply of equipment-materials for the construction of the project.
- Construction of piping networks to connect to the mechanical room.
- Start up the system
Our company recommends the application of open loop Geothermal systems in the following cases:
- In applications that require at least 18Kw of cooling or heating power.
- In cases where the quantity of water resources is guaranteed (e.g. coastal areas).
- In cases where poor water chemistry can be dealt with by special equipment and normal maintenance.
Table 1
Cost of Geothermal System ‘’Open Loop’’ > 18Kw
Τύπος
Ελάχιστο (€/Kw)
Μέσος (€/Kw)
Μέγιστο (€/Kw)
Ground Water Heat Pump
308
477
646
Well Pump
425
830
2300
Plate Heat Exchanger
20
80
160
Well construction
150
230
560
Table 1 (Source: Ground_Source_Heat_Pumps.pdf & Estimations from Whelve Energy team based on real projects at the island of Crete)
Total Cost= Kw*GWHP Cost + Kw*Well Pump Cost + Kw*Plate HEX Cost + Kw*Well Construction
The cost of open loop geothermal system depends on:
- The building heating and cooling Loads (peak loads it will need to cover).
- The geology & hydrology of the area (increases and reductions in drilling cost).
- The water chemistry.
- The quality of the materials.
