- DualVac
Green Therma’s single well deep earth heating solution using DualVac is simple, safe and reliable when compared to current 2-well geothermal heating solutions.
The Heat4Ever solution only requires one well to inject a fluid and extract energy from the earth.
It requires no geological formation characteristics such as thickness, permeability and porosity to produce heat.
This closed loop system has a number of very important benefits:
The patented DualVac technology brings heated water to the surface with vitually no loss of heat loss in the Heat4Ever solution. Maintenance of the system is easy as all equipment is on and accesible at ground level.
With this novel approach from Green Therma, we can more efficiently tap into the earths unlimited sources of energy.
Single well solution
Less geological requirements with no direct fluid interaction with the formation
No reservoir fracturing that potentially induce seismicity and possibly pollutes the drinking water
Unlimited sustainable heat after installing the system
Utilizing the earths never ending heat production
Utilizing heat directly below the end-user eliminating any transport requirements
Possibility of adjusting heat production depending on load requirements
The Dual Vacuum pipe technology (DualVac) was developed and patented by the Norwegian oil service company, Reelwell, which was founded in 2004. The technology is now licensed to Green Therma.
The technology was developed as part of a 100 mill USD research program in alliance with Equinor, AkerBP, Nabors, Halliburton, DP Master, Norwegian Research Council and EU.
In the closed system, fluid will flow within the outer pipe along a geological formation in the horizontal section of the well. Typically, this section is located at a depth around 2-4 km. In this process, the fluid is heated and then returned to the surface in the inner Dual Vacuum pipe with minimum heat loss. The DualVac pipe in the center works similarly to a thermoflask by limiting the percentage of heat lost. Without using a vacuum to isolate the inner liquid from the outer liquid, the model shows that a heat loss of around 35 to 40 percent can be expected.
The energy output per well is 2 to 4 MW. The produced hot water temperature and total effect is dependent on and can be optimized through the set-up of the system, depth of the well and completion of the well:
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