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Geothermal heat

Topic: Physics
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Function / Technology

A heat pump takes heat from rock, soil, air or water and provides warmth to the house.
For every kWh of electricity a heat pump needs to work to get close to 3 kWh due to the heat stored in the rock.
With a geothermal heat pump takes heat from the rock by drilling a typically 60-170m deep hole in the bedrock. In the borehole (energy well) for it then down a so-called collector filled with a coolant (eg, water and liquor) this fluid is pumped around the hose so that it traps the heat from the rock.
Technical description; Kollektorvätskan (brine) is pumped into hoses from the energy pit and transported to the heat pump.
Where the temperature is raised and the collected thermal energy is transferred to the heating system. The heat pump cooled kollektorvätskan headed back to the collector; to attract new heat from the bore hole.
The heat picked up from the bedrock and groundwater by a borehole, 41/2, 5 ½ 6 1 / 2in in diameter. Drill hole depths adapted to the energy requirement. It is large, several wells linked together. Two hoses are welded in the bottom, out into the borehole. Inside the collector there antifreeze (brine). The system is completely sealed, so liquid never comes into contact with groundwater.
For that groundwater should not be polluted by surface water flowing into the borehole, drilled a casing of steel down a piece of the rock and sealed with cement for example.

Pros and Cons

Benefits.
Geothermal heating is safe, secure and environmentally friendly. A free source of heat. Berg The heat is almost the same temperature all year round. The plant takes up little space so it can be used on a bit empty. Quiet. The municipality has also seen that this is an energy source that is becoming more and more because you can now apply for grants from the municipality for the installation of geothermal heat.

Cons.
Expensive to install. Expensive pumps.
If there is a long way down the mountain becomes the drilling cost expensive.
It may not be as fast as you think to earn the money they put out. In some brochures it says that it can take between 8 to 20 years before the rock heat paid off.

Position in Sweden and the world

Thinking of geothermal heat for your dwelling?
Then you have to keep a cool head, otherwise you can get an unnecessarily expensive heat pump. You might buy an unnecessarily.
The frost has come and in the basement standing oil boiler from the 70s. Maybe it holds a winter, but soon it's really time to change. More and more people choose any kind of heat pump, mainly for economic reasons. For this there is money to be made but it is important to have wits to get right.
In recent years the Swedish households had to pay 230 million extra to their new heat pumps have not worked as they should.
Geothermal heating is a relatively new heat source and has not been used for so long.
Geothermal heat was a big topic of conversation around the 2000s, where geothermal received great attention in the news as the ideal heat source that is both environmentally friendly and that you can make money from it.

Future

What will the oil shortage will mean in reality?
Number one: The troubled world that we live in becomes even more anxious. The majority of the world's remaining oil reserves are in Saudi Arabia, Iran, Iraq and countries thereabouts. The beds because it can be trouble ahead. Major oil beronde countries USA, Russia, China, India and Europe, with several sound world of interest to go before their own national interest. The need to develop other energy sources and start using them.

Number two: An uncertain world economy is facing major changes. We can expect that transportation costs could rise properly if there is a shortage of oil. This affects all of us.
A direct consequence is that freight is shifted from road and air to rail and ship. It takes longer and might make things more expensive. Another consequence may be that community trade and industrikkoncentration broken and there is a reversion to smaller communities that are closer energy sources.

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