What is RAUGEO?

Free, Renewable Energy

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.

How it Works

How it Works

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
A typical geothermal system uses a water-to-air heat pump to transfer the energy from the ground loop fluid to a forced-air distribution system. A water-to-water heat pump transfers energy directly to a hydronic energy distribution system inside your building.

When this distribution system is radiant heating and cooling, your heat pump will operate at its highest efficiency levels, delivering the highest coefficient of performance (COP) for heating and energy efficiency ratio (EER) for cooling.

1. RAUGEO U-bend
2. RAUGEO Collect
3. Manifold
4. Geothermal heat pump
5. Radiant heating and cooling distribution (optional)



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.

Installation Options

Fits Most Building Sites

The geothermal ground loop is custom-designed to fit your space and meet your heating and cooling requirements.

Vertical Loop
Where space is limited, vertical ground loops are inserted in boreholes which are several hundred feet deep using a well-drilling rig.

Horizontal Loop
Where there is plenty of open space and suitable soil conditions, a horizontal ground loop located about 5 to 7 ft (1.5 to 2 m) below ground, is the most economical option.

Helix Probes
RAUGEO Helix probes are ideal for use in both new builds, and refurbishments. They are the optimum choice if only a small land area is available and probe drilling is not possible, either for geological reasons or if it is not financially viable.

Signature Components

Unique Designs for Geothermal Optimization

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
Unlike HDPE U-bends that incorporate welded joints, RAUGEO U-bends are formed from one continuous length of pipe. The superior flexibility of RAUGEO PEXa allows the pipe to be bent in a tight 180-degree radius and cast in a fiberglass-reinforced polyester tip mold, eliminating the need for connections and the potential for leaks in the borehole. A double U-bend, made up of two single U-bends with independent pipe circuits, extracts more energy while offering a higher degree of security against loop failure.

Polymer Manifold
The REHAU polymer manifold provides greater control compared to typical reverse-return headers. The robust polypropylene design is offered in a range of sizes suitable for most geothermal projects. Integrating a manifold into a geothermal system design gives you much more control over your ground loops. By simply reading the manifold flow gauges, you’ll know that all your ground loops are functioning properly. If a circuit becomes damaged or unusable for any reason, the manifold allows it to be shut off. So, instead of losing the entire loop field, only one U-bend is lost, keeping your heating and cooling system operating until repairs are possible.

Easy System Optimization
Balancing numerous ground loop circuits can be challenging, especially if the length of one or two of the loops is different from the rest. Incorrect circuit balance can reduce system efficiency. The manifold allows you to balance each circuit individually with the built-in circuit adjusting valves, providing more freedom to design the most cost-effective well field.

RAUGEO PEXa pipe provides superior resistance to impact, rock impingement and the stresses of earth movement. Unlike HDPE pipes which require sand bedding, PEXa pipes can use natural backfill which is lower in cost and achieves greater thermal conductivity.

EVERLOC Fittings
Engineered for use with PEXa pipe, the REHAU EVERLOC brass fitting system connects your ground loop system components with a high level of security. Making compression-sleeve joints is a quick, reliable process that is not dependent on installer skill or weather conditions.

Helix Probes
RAUGEO Helix probes are made of our high quality PEXa pipe for maximum reliability and long-life cycle. Helix probes are used when only a small land area is available and probe drilling is not possible, either for geological reasons or if it is not financially viable.

*Results based on findings from: Crecraft, Harrison, and Justin Mahlmann. "REHAU in-situ Borehole Thermal Performance Testing," Chantilly: Bowman Geothermal, 8 Oct. 2009

RAUGEO Paired With Radiant Systems

RAUGEO Paired With Radiant Systems

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.