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HVAC – Going Geothermal
It is an irrevocable fact that energy prices have been soaring higher and higher in recent years. Geothermal options are now being considered as the best way to reduce their energy costs. The use of a geothermal exchanger for heat is a method that consumers are opting to employ in order to conserve energy while cooling or heating their home. When you consider beginning construction on a new house or simply replacing your existing cooling and heating systems, it is advisable to take into account the obvious advantages that geothermal usage has to offer.
Checking out the Geo Options
At first glance, geothermal cooling and geothermal heating may seem more like science fiction than a viable heating and cooling source. Not so. Rapidly advancing technology and catapulted geothermal cooling and heating into a method of proven credibility in environmental control. Its acceptance has enjoyed a steady growth and it is quickly gaining popularity among consumers who wish to install systems that are more cost effective. In addition to the heating and cooling properties that it can give your room during nighttime when the temperature of the room tends to drop, there are those geothermal systems, which can even provide a home with a hot water system.
This economically wise move, can save up to 60 percent on annual energy bills. The Federal government and quite a number of states in the US are offering credits and tax incentives to those who install a geothermal HVAC system. These incentive programs are also finding their way into other countries outside the US, such as in Canada. Consumers should access their state government website or the electrical utilities in their area to learn about possible incentive programs being offered.
Pump it Up with Geothermal HVAC Means
Pump exchangers, as well as heat exchangers, are technologies currently used in the geothermal HVAC system. Property owners who are installing a geothermal system on their land should drill out a well so that the water the well offers will be pumped using a heat exchanger situated inside the home. This allows the home to be heated by the fraction of the latent heat derived from the water that is produced by the well. During the summer, the well water temperature generally considerably cooler when compared to the air temperature outside. This, in turn, will cool the inside air, thus providing air conditioning to cool the home. Supplemental heating such as gas, fuel oil, or electricity is advised with this system, particularly in regions where the temperature drops below 0 degrees.
The pump, as well as the circulation fans which draw out water from the well, is powered by electricity. This, in effect, means free heat for the homeowner due to the fact that there is no consumption of gas or fuel of any type in order to keep things running with geothermal HVAC system.
Energy Star offers an informative website where consumers can learn more about geothermal heat pumps, their viability for your specific system and needs and a guide to qualified contractors.
Geothermal Heat Pumps – Top 5 Most Common Mistakes With Geo Heat Pumps
Geothermal heat pumps, also known as ground-source heat pumps, can be one of the most cost-effective and efficient ways to heat and cool your home or building. However, occasionally geothermal installations go wrong, often as the result of an inexperienced designer or installer. Below are some of the common pitfalls and ways to avoid these issues:
1. Oversizing equipment.
Oversizing equipment is common not only with geothermal heat pumps, but also in more conventional equipment like air conditioners.
Many contractors still use rules of thumb for sizing equipment, and then add a large “safety factor” to ensure that the equipment is big enough for the job.
Not only do heat pumps use more energy than necessary when oversized, but oversizing leads to short-cycling of on and off, which wears equipment down much faster, just like starting and stopping a car.
Also, because oversized equipment has shorter run-times, you don’t get the same amount of filtration and air circulation throughout the home, which can lead to bigger temperature variations in the house.
A good contractor will provide you with a detailed ACCA Manual J heating and cooling load calculation for the home based on your insulation, windows, and other details.Read More 2. Improper distribution system. Many homeowners spend a premium for a geothermal heat pump, only to integrate it with a lousy duct system or poorly designed radiant system. This is like putting bald tires on a brand new car. The best geothermal heat pump in the world cannot make an improperly designed air duct system more quiet or comfortable. Likewise, when a radiant system is not optimized to keep floor temperatures low, much of the efficiency of ground source heat pumps is lost. Residential duct systems should be designed in accordance with the ACCA Manual D. 3. Wrong pump for the job. The circulator pump is what moves water through the ground and into the heat pump itself. The pump must have enough power to overcome all of the friction from the piping and fittings, as well as be able to overcome the pressure drop of the heat pump. If the pump is sized to small, there will not be adequate water flow through the heat pump, potentially causing malfunctions or hurt the unit efficiency. On the other hand, an oversized circulator will use far more electricity than necessary. A good contractor will select a pump based on a head loss calculation and the specific heat pump. 4. Ground loop sized incorrectly. The key to a good geothermal system is the ground loop itself. An undersized ground loop is almost impossible to fix and will lead to an inefficient system at best, and a frozen (“slushy”) or overheated ground loop at worst. At the same time, a grossly oversized ground loop will be prohibitively expensive for little benefit. Never use “rule of thumb” for sizing your ground loop; a good contractor will take into account the heating and cooling load of the building, soil conductivity and temperature, flow rates, and other factors all into account. 5. Poor coordination. Depending on the size of the geothermal project, any number of different players may be involved, such as the owner, a general contractor, drillers, HVAC contractors, sheetmetal installers, engineers or architects, etc. The more parties that are involved in the project, the more important good communication becomes. For instance, the HVAC contractor needs to be aware of any changes that the architects make in the floor coverings to make sure the radiant floor works as designed. Ideally one contractor is responsible for all aspects of the geothermal system, including the equipment, ducting, and drilling or trenching. That way, if something goes wrong there is no “finger pointing” and the contractor can work to correct the problem.
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