GEOexchange Heating and Cooling Sydney

GEOexchange systems require little maintenance. When installed properly, which is critical, the buried GEOthermal ground piping loop can last for generations.

How Geoexchange Works

Geoexchange heating and cooling systems are always comfortable, yet the heating and cooling system is out of sight, performing efficiently without extensive maintenance or knowledge on the part of the homeowner. Geoexchange heating and cooling takes advantage of stable subterranean temperatures to provide efficient heating in winter and cooling in summer.

Outdoor temperatures fluctuate with the changing seasons however underground temperatures don’t change as dramatically, thanks to the insulating properties of the earth. One to two metres below ground, temperatures remain relatively constant year-round.

A geoexchange system, which typically consists of an indoor ground source heat pump and a buried system of pipes, called a ground loop, pond loop or reinjection well, capitalizes on these constant temperatures to provide “free” energy.

The pipes that make up a ground loop are made of polyethylene and can be buried under the ground horizontally or vertically, depending on the characteristics of the site

If an aquifer is available, engineers may prefer to design an “open loop” system, in which a well is drilled into the underground water.

Water is pumped up, run past a heat exchanger, and then the water is returned to the same aquifer, through “reinjection.”

In winter, fluid circulating through the system’s ground loop or well absorbs stored heat from the ground and carries it indoors. The indoor unit compresses the heat to a higher temperature and distributes it throughout the building, as if it were an air conditioner running in reverse.

Ground source heat pumps have efficiencies rated according to their coefficient of performance, or COP. Ground source heat pumps have COPs of 3.0 to 5.0. This means for every unit of energy used to power the system, three to five units are supplied as heat.

About the GEOexchange Process

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In summer, the geoexchange HVAC (heating, ventilation, air conditioning) system pulls heat from the building and carries it through the ground loop, where it deposits the heat into the cooler earth/aquifer
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Unlike ordinary heating and cooling systems, geoexchange HVAC systems do not burn fossil fuel to generate heat; they simply transfer heat to and from the earth. Typically, electric power is used only to operate the unit’s fan, compressor, and pump.
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A geoexchange heating and cooling system has three main components: the ground sourced heat-pump, the liquid heat-exchange medium (open or closed loop), and the air-delivery system (ductwork) and/or the radiant heating (in the floor or elsewhere).
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A geoexchange system typically requires considerably less plant space in comparison to conventional “air sourced” HVAC systems.

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(02) 9522 2062

GEOexchange F.A.Q.

Geoexchange systems require little maintenance. When installed properly, which is critical, the buried ground loop can last for generations. The unit’s fan, compressor, and pump are housed indoors, protected from the harsh weather conditions, so they tend to last for many years, often decades

What maintenance do GEOexchange systems need?

Usually, periodic checks and filter changes and annual coil cleaning are the only required maintenance

How important is correctly sizing the system?

 In the past, some improperly sized systems did overheat or overcool the ground over time, to the point that the system no longer had enough of a temperature gradient to function. CWL Group only use IGSPHA accredited engineers to carry out all of our ground heat exchanger designs and specification

Is GEOexchange just for heating?

Geoexchange systems work just as effectively in cooling and can be engineered and designed to deliver comfortable and discreet supply and return air registers comparable to conventional AC systems.

Other than heating where else can GEOexchange help?

A geoexchange system can efficiently heat and cool your entire home, provide potable hot water, pool heating and spa heating all using the same ground loop and “reversible” ground source heat pumps eliminating the need for multiple systems and plant.

Is GEOexchange really cost effective?

Geoexchange HVAC systems remove four times more kilowatt-hours of consumption from the electrical grid per dollar spent than photovoltaic and wind power add to the electrical grid. Those other technologies can certainly play an important role, but geoexchange HVAC is often the most cost-effective way to reduce the environmental impact of conditioning spaces.

Is GEOexchange noisy? Will I hear it?

Ground source heat pumps run very quiet and there is no equipment needed to be installed outside eliminating the need for large “outdoor units” and acoustic constraints as such with conventional air conditioning systems.

What is the expected life of a GEOexchange system?

Ground loops can last for generations. Ground source heat pumps typically lasts decades, since it is protected indoors. When it does need to be replaced, the expense is much less than putting in an entire new geoexchange system, since the ground loop or well is the most expensive part of the installation. New technical guidelines eliminate the issue of thermal retention in the ground, so heat can be exchanged with it indefinitely.

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Contact Us

CWL Group

Unit 9/189 Port Hacking Rd, Miranda NSW 2228
PO Box 396, Miranda NSW 1490

(02) 9522 2062


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