Serving Cohasset, MN and the Surrounding Areas
Put the energy in your backyard to work for you with a geothermal system installed from Benes Well Drilling Inc. Reap the benefits of utilizing the earth’s natural heat source to help purify your well. You can expect precision work from a company that is certified for geothermal systems by the International Ground Source Heat Pump Association (IGSHPA).
Ground Water (Open) System
Ground Water Systems (Open Loop) have been utilizing the earth's natural heat source and heat sink ability for over 40 years. Ground Water Systems draw water from an aquifer via a supply well, pass through the Geothermal heat pump's heat exchanger where heat is exchanged with the refrigerant inside your FHP unit.
The water is then returned to the aquifer by sending back out to a pond, lake, or low area to filter back naturally to the aquifers. Ground water temperatures remain very constant (usually within a degree) year round despite wide variations in outside air temperature; therefore your FHP unit will maintain its super high efficiency no matter how hot or cold it is outside.
Ground Water Systems are ideally suited for homes that have existing water wells available or a good potential source for well water. When ground water is available, this system usually has the lowest installion cost. This system is recommended only if the quality of your water exhibits low iron content.
Horizontal Loop Closed System
A horizontal loop is usually the most cost effective when adequate yard space is available and trenches are easy to dig. Using trenchers or backhoes digging trenches six to eight feet below the ground, you then lay a series of parallel plastic pipes or slinkies. The trench is then backfilled, taking care not to allow sharp rocks or debris to damage the pipe.
A typical horizontal loop will have an average of 800 feet of pipe buried in a 400-foot long trench, which will generally supply one ton of heat.
We do not recommend this type of system due to year-round efficiency and the depth and land area required to install this system.
Vertical Loop Closed System
Vertical loops are preferred in many installations where yard space is insufficient and where preservation of existing landscaping is desirable. Contractors bore vertical holes in the ground 180 to 200 feet deep. Each hole contains a single loop of pipe with a U-bend at the bottom. The hole is then grouted to improve the thermal conductivity. Each vertical pipe is then connected to a horizontal pipe underground and then connected to a manifold underground with one line running in and one line running out from the heat pump inside the structure.
The manifold can be installed inside the home if space is available for an additional cost. Vertical loops are generally more expensive to install, but will maintain a more constant year-round efficiency.
We highly recommend the vertical system and use it in our own homes.
Slinky Loop Closed System
Slinky loops are used to reduce the heat exchanger per foot trench requirements but require more pipe per ton of capacity. This pipe is coiled like a slinky, overlapped and laid in a trench. Two-pipe systems may require 600 to 800 feet of more pipe buried in a 125-foot trench that will basically give you one ton of heat. The trench length decreases as the number of pipes in the trench increases or as slinky overlap increases.
Note that with this system and the lines crossing over each other, one line can tend to rob heat from the others and efficiency levels drop. Therefore, we do not highly recommend this system.
Pond (Lake) Loop Closed System
Pond (or lake) loops are a special kind of closed loop system and may be the most economical closed loop system to install. Where there is a pond or stream that is deep enough and with enough flow, closed loop coils can be placed on the bottom where it can utilize the consistent temperature and outstanding heat transfer characteristics of the water. Geothermal transfer fluid is pumped in as in the other closed loop ground systems. No wells and very little trenching are required - cutting installation costs.
This system is the least recommended system by us as its efficiency can vary due to water temperature depending on the size of your pond or water source. Also, this system is more difficult to get approval for compliance through the DNR on public lakes due to opportunities for boats and other water vehicles to hit these lines, potentially creating problems.
For more information on geothermal heating systems, visit IGSHPA – Down to Earth Energy.
Put our over 50 years of experience to work for you! For a FREE estimate, give Benes Well Drilling a call today at 218-326-5859.
Benes Well Drilling Inc of the Grand Rapids, MN Area
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