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Geothermal Home System Guide

Geothermal home system are used in the United States and around the world for over 60 years. They are not against nature they work for it. You can cool a house or commercial building without combustion of fuel or greenhouse gases.

Geoexchange, geothermal or ground-source heat & cooling is often referred to as geo-exchange. They all mean the same thing, so don’t get confused when these terms.

geothermal home system can be a great way to heat your home, replace a furnace and be named money savers. Starting at depths of 6-10 meters the earth’s temperature is no longer influenced and remains largely stable at around 8-10 ° C by surface temperature.

Using heat pumps, heating systems and cooling systems, heat energy is extracted and distributed into houses. Based on the combustion you evaluate, you can save between 50% to 60% on heating and cooling costs, Geothermal cooling is close to the traditional air conditioning in summer months, except it is not just transferred to the outside but is stored deep in the ground to be used for future use.

Geothermal home heating systems:

Vertical loop:

systems feature a sealed U-shaped polyethylene conduit that carries a thermal transmission fluid (generally the water / methanol combination) into a continuously flowing boucle that enables heat exchange by pipe.

The additional or reduced amount of heat in the water is used as your home as the liquid returns to the surface whether cooled or hot, depending on the season. This system usually has a depth of 300 feet or more.

Horizontal looping:

structures work the same way as vertical systems except that pipelines run 6 to 10 feet underground back and forth. Instead of building a well, the construction includes digging trenches (at least 300 meters).

Horizontal systems can be cheaper to install, but require a lot of space, Horizontal loop systems are marginally less efficient than vertical loop systems for a given pipe length because surface temperatures are more easily affected. The other downside is that if there is a leak, the whole garden area should be dug in pursuit of a small leak that loses the system support with a horizontal mat or grid style system.

open-loop system:

In order to draw heat and inject it, open-loop systems use ground water directly pumped from a supply well (75–100 feet deep). Water is pumped from the first well and is injected into the second well after heat exchange. Open-loop systems have very good thermal efficiency and can be installed up to 50% cheaper than vertical loop systems. Conditions for the right functioning of such systems in urban areas are hardly found because a sufficient ground water supply is needed.

Closed loop systems circulate through loops of small underground pipes in an anti-freeze solution. This solution absorbs heat from the earth in cold weather and transfers it to a heat exchanger to produce electricity. When water is near a site, closed loop systems of pond or lake loops can be built in an economical way. The excavation expenses are eliminated. The anti-freeze passes into pipe tubes located at the bottom of the pond or bath. To avoid the influx of the winter freezing on the surface, a depth of at least 12 feet is required. The capacity of a pond or lake should be sufficient to absorb the heating or cooling energy needed without significantly affecting water temperature in the pond or lake.

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geothermal heating greenhouse

Underground soil and water comprise broad thermal energy reservoirs This energy is recuperated by geothermal home system and transformed into electricity that is used in greenhouses and other houses. Geothermal heat resources can be categorized in three groups: as medium, moderate and high temperatures:

Low temperature (50°F +/-):

The ambient soil temperature varies greatly throughout the year and follows the air temperature closely. At the distance of 5 and 6 foot, the temperature is measured 50 ° F, based on soil properties and above-ground environmental conditions. The average surface temperature at this point is also about 8 weeks behind the maximum temperature of the earth, which can be beneficial for winter heating and summer cooling. For the production of greenhouse plants, herbs, stocks of nurseries and certain vegetables. This soil heated air is of low grade can be utilized directly or a heat pump may be used to heat the greenhouse to a higher temperature.

Medium temperature (140-300°F):

In some parts of the world, thermal wells and springs will provide hot water directly for heating. In the Rocky Mountain and West Coast regions, hundreds of greenhouse projects are heated by natural geothermal energy. Fine radiation or root zone heating is used to circulate the hot water from the ground.

High temperature (>300°):

Geyser steams are used for power generation in California, Nevada, and Utah but not for greenhouse heating. There are actually around 20 places under construction with more. This produces 5-8 cents / kW hr of electricity.

Greenhouse Heating Systems

In most regions around the world, low temperature heat is the economic choice for geothermal home system, because it provides a reasonable return, usually ten years or less depending on the design of the system and on the cost of replacement fossil fuel. It is necessary to carefully determine the approximately benefit for your scenario to taking into account the setup of a geothermal system and to execute energy saving initiatives that typically have a pay back of a few years. These include air infiltration prevention, the installation of energy barriers, insulation sidewalls and the base wall, space-building and electronic environmental control systems. These steps should first be taken out as they can significantly reduce the heat loss and therefore reduce the size of the heating system required for the greenhouse.

Air systems

Earth tubes are piped 6-12 feet under the surface of the ground. The most simple and cheapest systems collect heating in winter by drawing air through on – the-ground plastic tubes and transferring it into the heating zone. The water, which has a high temperature than the surface, warms the air going through the pipe. In the summer the system can be used to cool the building area through buried pipes, drawing air from outside the greenhouse. The colder soil reflects the sun.

Fluid systems

Liquid systems usually utilize surface heat or electricity from a well, pond or any other body of water in the closed loop from which the heat is extracted to steam a fluid such as propylene glycol or methyl alcohol.

Conclusion

geothermal home system technology today is less effective than it was a few years ago. The use of residential geothermal heat is increasingly popular, along with increasing fossil fuels instability rates. Because the high temperatures are normally required for heating the greenhouse, geothermal systems may need a heat pump. If low temperature heat is required, such as keeping the air temperature just above zero, it is possible to directly use the power.

References:

https://www.ecohome.net/guides/2349/geothermal-heating-and-cooling/

https://farm-energy.extension.org/geothermal-heat-for-greenhouses/

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