The full length of the borehole is used
Since the outer sleeve is watertight, it can be filled with water all the way up to ground surface level, making it possible to use the complete length of the borehole for heat exchange.
Maximum heat exchangeThe outer sleeve of the Thermex-collector is tight against the borehole wall along the whole length of the borehole giving maximum heat exchange between the fluid in the borehole and the surrounding ground.
Minimal loss of pressureThe Thermex collector makes optimal use of the volume of the borehole with low pressure loss as a consequence.
Isolating designThe Thermex collector isolates the warm flow of liquid from the colder. Warm water flows upwards through the center pipe - or vice versa if needed. The air-filled space between the two center pipes isolates the warmer liquid from the colder eliminating so called thermal shunt flow.
Simplified permit processSince the Thermex collector is tightly applied against the wall of the borehole there is no risk for negative cross effects on the ground water, which simplifies the permit granting process.
No grouting neededNo borehole grouting with bentonite, concrete of similar is needed. The outer sleeve of the Thermex collector is tight against the wall of the borehole.