The geothermal survey will be dependant on the reports that are required for the designs of the geothermal system and installation will be to the latest MIS 3005 requirements to enable the project to comply for funding from the government.and may involve the following:-
- Thermo-geological assessment of the site, the geology and thermal conductivity
- Discussions to define the requirements of the geothermal system, heating and cooling loads
- The borehole design, modelling, borehole quantity and depth with required spacings
- A site visit to assess the ground temperature of a borehole with a thermal response test
- Based on thermal response tests or drilling feedback the re-calculation and final design confirmation
Borehole designs of the geothermal survey and installation will be to the latest MIS 3005 requirements to enable the project to comply for funding from the government.
Geothermal surveys along with a Thermal Response Test are strongly recommended for larger GSHP installations
A geological geothermal survey will give a strong indication of the thermal characteristics at the site where the boreholes are to be drilled and installed and this will enable the MCS look up tables to be used to estimate more accurately the heat recovery per metre of borehole.
In the absence of any geological data, Teckna Group will estimate the borehole requirement using conservative values for heat recovery, however this can result in 5-10% more borehole metres being drilled than absolutely necessary.
On larger installations, this can easily mean a difference of one borehole or more. As each borehole is likely to add £4-5K to the cost of the total installation it soon begins to make sense to invest in a geothermal survey to achieve a more accurate estimation of total borehole requirements.
- As a rule of thumb, installations of up to around 15kW Heat pump capacity can be estimated solely using the MCS tables
- Installations of 15 to 30 kW should be dimensioned with the help of a geological survey
- Installations of above 30 kW definitely require a geological survey and could well benefit from a TRT.