Hellbent Geothermal. Taking A Closer Look at the Value of Geothermal. John Managh Hellbent Geothermal March 3 rd , 2012. HELLBENT GEOTHERMAL. to a sustainable future. Geothermal Defined. Geo refers to earth Thermal refers to heat
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March 3rd, 2012
to a sustainable future
Geothermal = the use of the earth’s heat as the energy source for heating our homes
Today the technology exists to bring this energy from the earth into our homes. We can harvest this energy from our own backyards.
Hellbent Geothermal can provide this service to help you dramatically reduce your energy consumption while lowering your environmental impact.
A geothermal system uses the energy of the sun, stored in the ground to keep you comfortable year round.
Even in the winter, when a blanket of snow covers the ground, this valley’s ground temperature is a constant 47degrees F.
This means that you have a steady supply of heat to keep you in comfort, even in the depths of the coldest winter.
provide an alternative to home heating and cooling using a renewable energy source
Operates on electricity
Uses a fraction of energy compared to a traditional furnace
No carbon emissions thus eliminating carbon output from your home
Rising energy costs make geothermal a good option
Owners are searching for cheaper solutions to heating and cooling costs – slash utility bills by 66%
Owners want a realistic payback period – between 4 to 6 years in Columbia Valley
Twice the lifespan of conventional systems
Adds serious curb appeal and resale value to your property
You gotta know where you’ve been to know where you’re going…
We have been bringing heat into our homes for a long time!
The heat pump was described in 1853 by Lord Kelvin, with the first model built in 1855 by Peter Ritter von Rittinger.
After experimenting with a freezer, Robert Webber built the first ground-source heat pump in 1945.
The first successful commercial project was installed in the Commonwealth Building in Portland, Oregon in 1946 where it is now designated as a National Historic Mechanical Engineering Landmark.
The technology became popular in Sweden in the 1970’s, and has been growing slowly worldwide in acceptance ever since.
Open well systems dominated the market until development of polyethylene pipe in 1979 made closed loop systems economically viable.
The industry has averaged 30% growth per year.
Heat loss and Cooling Load calculation.
Insures correct sizing. We want to design to 80% of our total heating load.
Determines outside requirements:
the number, length and depth of trenches and boreholes.
Also helps with balancing distribution
A variety of choices. Mostly site specific.
Water, antifreeze or refrigerant can be used as the loop medium.
Open-loop or Closed-loop.
Performance of the system will largely depend on the EWT.
Heat transfers from a warm area to a cooler area.
Local site geology will determine the length of the ground–loops.
Test holes will help determine the thermal conductivity.
Make use of water well logs.
Wet, saturated rock is great.
Dry, light soil is not so great.
A series of pipes are buried in the ground. A methanol solution is circulated through the piping to make them highly efficient conductors of heat.
In the winter, the methanol in the piping absorbs the heat from the ground and, now warmed up, the fluid is pumped back through the geothermal unit in the house and the process repeats itself.
In the summer the process is reversed if air conditioning is utilized. This will also preheat the ground for the upcoming winter.
Drilled boreholes may be the only choice for suburban or densely treed lots.
Best to drill below the house’s footprint with new construction.
Aim for 20’ x 20’ spacings. And angle, if possible.
Use high conductivity grout.
A reverse-return layout is required.
Trench below frostline and insulate all piping within 10’ of foundations.
Contain R410a refrigerant.
Type K copper tubing.
Maximum 100’ drilling depth for a significant cost advantage
Ideal for restricted land area.
More efficient heat transfer with one less heat exchanger.
Fewer moving parts, including circ pump elimination. More reliable.
Cathodic protection added.
Heating in the Winter
After the pipes have transferred their heat and the heat pump has done its work maximizing the heat value of the circulated fluid, the heat is then drawn off the heat exchanger and circulated throughout the house using the existing distribution system.
Cooling in the Summer
In the summer, the process is reversed. The hot air in the house is essentially absorbed by the geothermal unit which now circulates much cooler pipe fluid.
The heat is transferred first to the pipes then to the ground outside before returning, cooled, to the house.
The underground loops connect to the main geothermal unit installed in your house, and is connected to your home’s heating and cooling system.
Geothermal systems are compatible with your home’s distribution system:
Simply stated: A mechanical device that absorbs heat energy at one location and transfers it to another.
A heat pump can move 3.5 to 4.5 times more heat to or from a building than the energy required to operate it.
The energy efficiency of heating equipment is rated by their COP.
A heat pump's capacity is rated in “tons”.
Eg: 4-tons equals 48000Btus
Designed to match the capacity of the heatpump and needs of each room.
Increased airflow due to lower air temperatures will necessitate larger ductwork and/or additional registers.
Ductwork may have to be upgraded in retrofits to avoid excessive noise.
Use isolation collars and turning radii on the corners of the plenums.
A well designed geo forced-air system will eliminate hot and cold spots.
Perfect match for lower temp geo hotwater. Quiet, comfortable warmth.
Need a hotwater storage tank to avoid short cycling.
Adequately sized circ pump.
Insulate under slab.
Preferred choice for high ceilings and dust free environments.
Snow and ice melt option.
You will benefit from free or reduced- cost hot water. A geothermal system will heat your water 2 to 3 times more efficiently than a regular hot water tank.
A separate desuperheater circuit isolates the potable hot water from the main hydronic circuit.
Hydronic storage tank
Long System Life
Low purchased energy
Check for bylaws within in your municipality or regional district.
Obtain permits if necessary.
Check before you dig! Locate all other services on the property.
Ensure all work is to CSA 448 standards.
Especially for Grant applications.
The Canadian GeoExchange Coalition is Canada’s watchdog.
Geothermal systems use a renewable resource, the earth, which is efficient and non-polluting.
“There is unlikely to be a potentially larger mitigating effect on greenhouse gas emissions and the resulting global warming impact of buildings from any other current, market-available single technology, than from ground-source heat pumps”.
Federal and provincial governments recognize the important role that geothermal plays in reducing home energy use, and have created rebate programs that facilitate installation.
Livesmart BC : $2500
Low interest loans
Upcoming PAYS program.
Canada has a young industry. densely treed lots.
30000 residential and 6000 commercial installations.
Could help Canada meet GHG reduction targets.
From the Pembina Institute: “Increasing residential geoexchange installations from 0.5% to 1.5% and commercial from 1.5% to 25 % is a realistic and cost-effective way to help Canada meet GHG reduction targets of 25% below 1990 levels by 2020.”
Know your Municipal Official Community Plan!
Seek local groups, programs, actions that demonstrate support for alternative energy consumption
Support and encourage changes in policy and by-laws to facilitate the process of utilizing progressive alternative energies – keep it moving!
Mentor and educate!
“Do not wait for extraordinary circumstances to do good action;
try to use ordinary situations.”
Jean Paul Richter, Novelist and Humorist