Geothermal systems are "the most energy-efficient, environmentally clean and cost-effective space conditioning systems available today," according to the U.S. Department of Energy.
Heat from the sun warms the earth and keeps the underground temperature relatively constant throughout the year. A geothermal heat pump system takes advantage of this renewable energy... moderate and relatively constant ground temperatures to provide free, renewable energy for heating, cooling and domestic hot water.
RAUGEO™ is a system of piping placed underground that captures the earth's energy. This system works well on its own or, for optimal efficiency, when used in tandem with our radiant heating and cooling systems.
The Heat Exchange Process
The ground loop heat exchanger is a sealed, pressurized closed loop pipe system that circulates a heat transfer fluid below the earth’s surface. The same ground loops are used for both heating and cooling. When heating, the system collects and concentrates heat from the ground and delivers it to the building. When cooling, excess heat is removed from the building and dispersed into the ground. (Simply turn a switch on your indoor thermostat to reverse the flow of energy inside the heat pump.)
Energy Transfer – From the Ground to Your Heat Pump
Minimizes Environmental Impact
A ground source heat pump system can reduce energy costs by up to 70 percent over conventional systems in the heating mode and up to 50 percent in the cooling mode, according to the EPA.1 They typically use only one unit of electricity to move three to four units of energy to and from the earth.
Reduces Operating and Maintenance Costs
The initial investment in a geothermal heat pump system in commercial applications are comparable to conventional systems. Once the initial investment is recouped, which typically occurs in five to ten years, you’ll enjoy many years of stable, low-cost energy. With few moving parts, geothermal heat pumps are durable and highly reliable, lowering your maintenance costs.
1 Geothermal Heat Pumps, ToolBase Services, NAHB Research Center, http://www.toolbase.org, 15 Jan. 2010.
The geothermal ground loop is custom-designed to fit your space and meet your heating and cooling requirements.
The RAUGEO™ system is based on a European ground loop heat exchange design that has been in use for more than 30 years. It includes a manifold instead of a buried HDPE header and RAUGEO PEXa pipe instead of HDPE pipe. When these features are combined, the result is a more secure system that is cost effective and easier to install.
RAUGEO Double U-bend: Extracts More Energy, Less Drilling Needed at Installation
In North American thermal performance testing* RAUGEO Double U-bends installed alongside single HDPE U-bends experienced significantly lower borehole thermal resistivity. Test results demonstrated that the RAUGEO Double U-bend with pipe spacer requires 20 percent less borehole footage to extract the same energy as a single HDPE U-bend, allowing drilling costs to be reduced.
RAUGEO Double U-bend
RAUGEO PEXa Pipe
*Results based on findings from: Crecraft, Harrison, and Justin Mahlmann. "REHAU in-situ Borehole Thermal Performance Testing," Chantilly: Bowman Geothermal, 8 Oct. 2009
A natural synergy...
If you’re considering using our RAUGEO ground loop system, you’ll also want to look at radiant heating and cooling, and vice versa.There’s a natural synergy between the two.
Here's why: In order to provide comfortable room temperatures, radiant heating works well with relatively low water temperatures and radiant cooling works with moderate water temperatures. It’s precisely in these temperature ranges that your water-to-water geothermal heat pump operates most efficiently.
So, by combining RAUGEO with REHAU radiant heating and cooling, you’ll enjoy the greatest comfort at the lowest operating cost. You’ll also appreciate the reliability of REHAU quality components from the geothermal probe to your thermostat, including durable PEXa pipes, secure EVERLOC joints and manifolds with individually controlled circuits.
It could be all you need for total comfort.
In many cases, a properly designed geothermal-radiant system can provide enough energy to heat and cool your entire space even in extreme temperatures.