Posts Tagged ‘Geothermal Heating’

Geothermal Myths: Some Pointers from Fall City

Wednesday, November 16th, 2011

As with any misunderstood technology, there are a lot of myths and misconceptions concerning geothermal heat pumps and how well they work. While these types of systems certainly have their limitations, the same is true of just about any type of heating and cooling system you could have installed in your Fall City home. But if you are really trying to evaluate whether or not a geothermal heating system is right for your home, you need to know exactly what is true about these systems and what is just not true.

For instance, there is a widely held belief that geothermal energy is not a viable heating option in areas with harsh winters. The fact is, though, that even when the air temperature outside is below freezing, the temperature several feet below ground can be as high as 55°F.

With a ground temperature like that, a geothermal heat pump will have no trouble extracting enough heat to keep your home comfortable even when it is well below freezing outside. And even when the ground freezes, the frost usually only extends three or four feet below the surface. Since the pipes for your geothermal heat pump will be at least four feet down, the frost should not affect them at all.

Also, it is common for people to assume that geothermal heat pumps will always need to have a regular heating system in place to serve as a backup. In fact, a geothermal heat pump is quite capable of providing consistent and adequate heating for your entire house as long as it is properly sized and installed. Make sure you are dealing with an experienced and qualified contractor and you will have no problems along these lines.

There are also plenty of myths floating around out there that geothermal heat pumps are just too expensive to make sense as a home heating solution. The truth is that geothermal heating costs almost nothing to operate.

While it is true the geothermal systems are quite a bit more expensive to install than many of the other options, alternative heating systems will still cost a significant amount to install and you will also have to pay much more to operate them on a regular basis. With a geothermal heating system, you pay quite a bit up front, but it is a one-time cost and there will be minimal monthly heating bills after that.

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How Effective is Geothermal Heating? A Question from Fall City

Friday, October 21st, 2011

Geothermal heating is an efficient way to use the Earth’s natural resources to heat a building’s interior. But is it an effective way to heat your Fall City home? The simple answer is yes.

Consider the cost of geothermal heating. Once you get past the initial installation costs of a geothermal heating system, which are higher than other conventional heating systems, its operating costs are much lower because of its use of a natural, renewable heat source – the Earth. If you plan to stay in your home for many years, a geothermal heating system will likely pay for itself because according to International Ground Source Heat Pump Association, geothermal operating efficiencies are 50-70% higher than other heating systems, which represents a substantial lowering of energy costs.

And according to a leading electric utility company, the cost of electricity for operating a geothermal heat pump is lower than any other heating system which includes natural gas, propane, and oil.

Beyond lower energy costs, geothermal heating leaves a smaller carbon footprint than other heating systems. According to the U.S. Environmental Protection Agency, carbon dioxide (CO2) emissions from the average U.S. home is 17%, most of which comes from burning fossil fuels for electricity. Geothermal uses natural heat from the ground and therefore uses 30-60% less energy than more conventional heating and cooling systems. Using less energy equals less carbon dioxide production.

A geothermal heating system is only as effective as the equipment used to deliver it throughout the building. The most common delivery method is through a ground source heat pump. This pump pulls the heat from the earth and distributes it. When properly installed and maintained, a ground source heat pump can last 15-20 years and provide an excellent source for heating – and cooling.

The components of a geothermal system also include a compressor, air handling unit, and duct system. When all are installed and maintained correctly, a geothermal heating system will be just as effective in heating a building’s interior as any other heating system. Just be sure you hire a qualified heating and cooling professional to install and service your geothermal heating system.

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Is Geothermal Energy Renewable? A Question from Startup

Friday, October 14th, 2011

Geothermal heating systems take heat from the ground and transfer it to your Startup home. But how does this heat get into the ground in the first place? Conventional heating systems like furnaces use energy sources like oil or natural gas to generate heat. These energy sources are not renewable, and neither is electricity which is typically generated by burning coal or another non-renewable resource.

The renewable resources we usually think of first are solar and wind power. The sun, of course, will continue to shine and provide heat year in and year out whether we make use of it or not. Similarly, we cannot use up the wind. It will continue to blow no matter how many times it has blown before.

But what category does geothermal energy fit into exactly? Well, it is actually a renewable resource just like solar or wind energy. In fact, geothermal energy is a direct result of the sun’s heat relentlessly pounding the ground. The ground actually absorbs a considerable amount of the heat from the sun that reaches the earth every day, and that is the heat that your geothermal heating system is using to heat your home.

Of course, a geothermal heating system cannot run on geothermal energy alone. The indoor components of this heating system that keep the air flowing throughout your house must be powered by electricity. But the amount of energy needed to do this is much less than what you would need to use to run a furnace or other type of more conventional home heating system.

Over all, geothermal energy is an excellent and renewable source of energy. And once you have the heating system in place, you will need to spend very little to keep it up and running. It is an excellent option for many people, and can help to keep your home cool in the summer as well.

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How is Geothermal Different Than Other Heating Systems? A Question From Preston

Friday, October 7th, 2011

There are many methods to heating a building in Preston. Early methods included burning coal and wood. Today, sophisticated building controls call for more efficient means of heat – and a method gaining in popularity is geothermal heating.

Air handling units are only designed to move air from one space to another. How that air is heated from the source is what differentiates geothermal from other energy sources.

To understand some of the differences, let’s look at the definition of geothermal heat. By definition, geothermal heating comes from its direct use of geothermal energy, which comes from below the Earth’s surface. And the Earth is known as the greatest conductor of heat. The constant, renewable temperature of the Earth (56-58 degrees on average below 10 feet) provides a heat source requiring no energy conversion, which adds to heating efficiency and ultimately, the cost to heat a building.

In order to heat a building, natural heat from the ground absorbs a colder refrigerant, which is circulated throughout the ground by a series of polyethelene tubing, which is generally positioned five to ten feet below the surface. This heat is transported via the refrigerant to a compressor inside a heat pump, where it is compressed and the lower temperatures are transformed from around 50 degrees to temperatures much higher, as high as 100 degrees of more. This hotter refrigerant is circulated through the tubing within an air handling unit, where colder return interior air absorbs the heat. The heated air is then carried to a building’s interior via fans. The refrigerant, with the heat removed, now becomes colder as is re-circulated into the ground to absorb the natural, renewable heat. In essence, the ground provides free heat.

Other methods of heating include forced air natural gas, oil, solar, propane, electric, radiant, and steam. Each heat source requires mechanical means to heat up the supply air. For example, natural gas – which is used to heat about half of all U.S. homes – is heated via a heat exchanger in a mechanical furnace, which runs on electricity. Radiant or steam heat is generated by mechanically raising the temperature of water or refrigerant via electricity. These methods differ from geothermal because the natural heat of the Earth provides the means for raising the temperature of the refrigerant used to transport heat to the air handling unit.

One drawback to using geothermal heat compared to other energy sources is the cost to bring this natural heating method into a building. The initial installation of a geothermal heating system is much higher than conventional natural gas heating – for example – because of the cost to install the tubing called a ground loop beneath the Earth’s surface. No other heat source, other than radiant heat, requires a series of tubing to deliver heat. But then again, radiant heat does not require a ductwork system to transport heated air or remove colder air. Geothermal requires a series of metals tubes to heat the refrigerant and the ductwork to move the heated air throughout the building.

On the flip side, its energy efficiency – using the Earth’s natural heat – is much greater than other heating sources resulting in lower utility costs, often fractions of the cost to use other heat sources. Energy savings could pay for the cost of installing the geothermal system over several years – another characteristic of geothermal heating.

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