What sets EarthLinked apart from air source heat pumps?
By using the constant and favorable temperature of the earth as its heat source, 75% of the heat delivered to the building by EarthLinked is renewable energy, therefore efficiency is greatly improved. Mechanical simplicity and the constant earth temperature assure longer equipment life and less maintenance.
What is a “Direct Exchange” or “GeoExchange” heat pump?
GeoExchange technology uses the earth’s renewable energy, just below the surface, to heat or cool a home or other building, and to help provide domestic hot water. It’s sometimes referred to as a geothermal or ground source heat pump. An EarthLinked heat pump circulates refrigerant through copper tubing placed in the ground, thus enabling the refrigerant to exchange heat more directly with the soil through the walls of the copper tubing. This eliminates the plastic water pipe and water pump to circulate water found in a water-source geothermal heat pump.
What sets EarthLinked apart from other geothermal systems?
EarthLinked systems use copper earth loops to directly exchange heat with the earth, thus eliminating the water circulating loop and intermediate heat exchanger. Installation, operating and maintenance costs are thereby reduced. Because of its size, EarthLinked can be installed in smaller yard space than other systems.
Why is EarthLinked more efficient than other geothermal systems?
EarthLinked eliminates the intermediate heat transfer required by water-based systems. Its direct heat transfer method does not require the circulating pump found in water-based systems. The system is also inherently more efficient because of ETI’s modulating refrigerant flow controls.
How do EarthLinked Adaptiv™ Refrigerant Flow Controls differ from others?
The two controls are simple mechanical controls that respond directly to the temperature and velocity of refrigerant flow through the system. They modulate the amount of refrigerant in circulation to assure optimum efficiency at all times. By eliminating subcooling in the condenser, the system operates at lower refrigerant “head” pressures with increased mass flow, which reduces energy consumption and increases heat transfer system reliability and useful life.
How long have EarthLinked systems been operating?
In 1980, EarthLinked Technologies began research and development of EarthLinked systems. In 1985, field demonstrations began for six electric utilities from Florida to Michigan. Marketing commenced in 1992.
Can I replace an existing air source heat pump with EarthLinked?
Yes. Existing ducting and air handlers can be used with minor modifications and the addition of the earth loops and compressor unit.
What effect does EarthLinked have on the environment?
U.S. EPA and DOE have determined that ground source heat pumps have the lowest environmental impact of all heating systems and they reduce energy consumption and corresponding emissions up to 72% when compared to electric heat strips and standard air conditioning. The refrigerant used by EarthLinked is not toxic, and is the same as that which is currently used by a majority of the HVAC industry.
How long will the earth loops last?
Copper is one of the few metals that exist naturally as an element in the earth. A noble metal, it is essentially immune to corrosion in most underground environments because of the protective film that forms naturally on its surface. In rare exceptions where pH readings exceed safe levels, cathodic protection for the in-ground copper is offered by ETI. With some installations dating back to 1980, ETI has never experienced a field failure of the copper pipe due to corrosion or mechanical damage.
How do the earth loops work?
The standard compressor circulates refrigerant through the earth loops (with sufficient velocity to transport the lubricating oil through the system) while it is heating in the winter or reversing the flow for cooling in the summer. Its patented refrigerant flow controls assure a flooded evaporator condition and full utilization of the condenser for optimum efficiency under all operating conditions.
How is the earth loop system installed?
Earth Loops can be installed horizontally in pits or trenches using excavators or trenchers, as well as vertically or diagonally using small bore drilling equipment.
How long does it take to install the earth loops?
Loops for a 3-ton system in pits and trenches can be installed in a single day. Loops using vertical and diagonal bores can be installed in two days.
Where is the compressor unit installed?
Because the EarthLinked system does not require an outdoor coil and fan, the compressor unit can be located in a basement, utility room, garage or outdoors. A fully enclosed, well insulated cabinet assures quiet operation.
Can the system be used to heat water?
Yes. The EarthLinked water heating options include desuperheating (providing “free” hot water in the cooling mode) and integrated “on-demand” for year-round domestic hot water. The system can also provide hot water for radiant in-floor heating.
Is the EarthLinked system AHRI certified?
Yes. The EarthLinked system is rated according to AHRI (the Air Conditioning, Heating and Refrigeration Institute) Standard 870 for Direct GeoExchange Heat Pumps. The average heating COP is 3.9, with a cooling mode EER of 17. The system is ETL safety listed and qualified under the EPA Energy Star® program standards.
Will EarthLinked Technologies be installing my system?
No, EarthLinked manufactures the geothermal system. Independent contractors in your area are trained and authorized to sell, install and maintain your EarthLinked geothermal system.