A natural and renewable resource, geothermal energy is heat from the earth. The sun heats the earth to a nearly constant 45-70 degrees year round. Geothermal energy can be harnessed through heating and cooling systems to warm a home in the winter and cool it in the summer.
How does geothermal heating and cooling work?
Geothermal heating requires a looped well system installed just below the surface of the earth. A water solution flowing through the well’s piping in the ground absorbs heat from the ground in winter and transfers it to a geo-exchange system inside the building. There, the heat is concentrated and transferred to air circulating through the interior to provide warmth. In summer, the process is reversed. The system extracts heat from the interior air and transfers it to the ground by way of the ground loop piping.
Inside the house, the geothermal heat pump uses a refrigerant to heat the air inside the home during the winter, and in the summer it extracts heat from the air inside the home.
Standing Column Wells
What is a Standing Column well?
A Standing Column well (SCW) is a traditionally constructed water well with a submersible pump system. SCWs are constructed similar to a standard water supply well. Water is pumped from the well, through the heat pump and is returned to the opposite end of the well. When operating in the heating mode, the heat pump extracts heat energy from the water, reducing its temperature, before returning it to the well. Solar stored heat energy in the ground naturally flows from the bedrock into the water to warm it back up before it is recycled back through the heat pump.
GWW is the only water well contractor and geo-exchange installer in Maine with the knowledge, skill, and ability to install a Standing Column well and pump system, which will provide geo-exchange for geothermal heating and cooling.
Closed Loop Wells
What is a Closed-loop well?
A Closed-loop well is a borehole with two parallel high-density polyethylene pipes (HDPE) grouted its full length. Typically there are two or more Closed-loop wells piped together. A water based glycol solution is pumped through the Closed-loop wells to the heat pump, which extracts heat energy from the fluid, dropping its temperature. When this cold fluid is returned to the Closed-loop well, heat energy in the ground naturally flows through the grout and HDPE pipe and into the fluid, warming it back up.
What is an Open-to-recycle well?
An Open-to-recycle geo-exchange well typically involves two shallow, high yield wells. A submersible pump is set into one well, which pumps water from that well through the geothermal heat pumps. All of the water is then discharged back into the aquifer in the second well. This well can also be used to supply domestic water in addition to geothermal.
Installation & Service
Accredited Geothermal Well Contractors
Our skilled and knowledgeable contractors are fully accredited for the installation and service of all geo-exchange systems – Standing Column Well, Closed-loop, and Open-to-recycle.
Standing Column Well (SCW) Design Tool
At Goodwin Well & Water, our engineers have developed a proprietary software – the only one of its kind – to achieve optimal efficiency and performance in Standing Column Wells for traditional water wells and geo-exchange systems. This software performs the complex set of calculations required to arrive at the optimal design for each residential SCW, taking into account unique characteristics and requirements of each customer’s individual situation.
2282 Auburn Road
PO Box 661
North Turner, ME 04266
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