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Frequently Asked Questions
Over the years, interest in the EarthLinked geothermal heat pumps has generated many questions. This list is not completely inclusive, but it will attempt to point out the most common questions. Please visit www.earthlinked.com for more FAQ's, or contact us here at Pink's DX Technologies, LLC.
What sets EarthLinked Technologies, Inc. (ETI) apart from air source heat pumps?
By using the constant, favorable temperature of the earth as its heat source, ETI heat pumps harvest the renewable solar energy stored in the earth. Mechanical simplicity and the constant earth temperature assure longer equipment life, less maintenance, and much higher efficiencies than air source heat pumps.
What sets ETI apart from other geothermal systems?
Because the ETI direct method does not consume energy to circulate water; does not have an intermediate heat exchanger from water to the refrigerant; exchanges heat through copper refrigerant tubing; and it uses proprietary ETI refrigerant flow controls, it has proven to be 15%-25% more efficient than water-based geothermal heat pumps.
How is the earth loop system installed?
Direct Axxess earth loops can be installed horizontally in pits or trenches. They can also be installed vertically or diagonally using small boring equipment. A 3" x 100' borehole is all that is needed, and the surface footprint is very small (typically 7'-14' diameter of disturbance).
What special training and equipment is required for installation?
Typical HVAC installation equipment, and knowledge of copper brazing methods are used in installation. There's no need for an expensive purge cart, fusing tools, IGSHPA training, loop circulation pumps, antifreeze, or pump sizing knowledge required because of water loops. On the refrigerant side, the factory-assembled earth loops are brazed to pre-fabricated manifolds. Visual indicators assist in proper system charging--no charging charts needed. Little special training is required for installation.
How Long have ETI systems been operating?
Is it difficult to install the EarthLinked system in an existing home?
In rare exceptions, where pH readings exceed safe levels, cathodic protection for the in-ground copper is available from ETI. With some installations dating back to 1980, ETI has never experienced a field failure of the copper pipe due to corrosion.
Visit the Copper.Org website for more information, and read this article about copper tubing in soils.
In the heating mode, the compressor sends liquid refrigerant to the earth (evaporator). There, it experiences a latent heat exchange by boiling/evaporating into a low pressure gas. The compressor then pressurizes this gas, concentrating the heat extracted from the earth. The high pressure gas goes to the condenser (refrigerant air coil or hydronic water coil) and heats the air or water.
The process is reversed in the cooling mode as the earth becomes the condenser, and the air coil or hydronic heat exchanger becomes the evaporator.
Commercial water heating is also an option. Applications such as hotels, restaurants, dormitories, apartments, nursing homes, schools, swimming pools, laundries, and many more could save up to 75% on their water heating costs.