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Sun

The earth can absorb nearly half of the sun’s energy. The ground stays a relatively constant temperature through the seasons, able to absorb the rejected heat in summer and release this heat stored back in the winter.

Brought to You by:

Dan Walsdorf of Advanced Custom Geothermal and The Wisconsin Geothermal Association.

Geothermal Best Practices and Ownership

Learning Objectives for this session

Understand how geothermal works.

Proper applications, components, design and energy analysis challenges of every geothermal system.

Types of geothermal systems.

System performance vs alternatives.

Understand the values of each component and the useful life.

Examples of installation with Geothermal.

Where is the future of geothermal.

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Key Components to Achieve a Successful Geothermal System

• Geothermal Heat Pump• Energy Delivery System • Geothermal Earth Loop• Liquid Loop Heat-Exchange Medium• Qualified Installing Professional• Qualified Designing Professional

Consumer Research 2015

Department of Energy Goal

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Interesting Facts

According to the Environmental Protection Agency (EPA), GeoExchange technology is the most energy-efficient, environmentally-clean and cost-effective space conditioning

system available.

Federal Tax Credits (residential) currently in place allows for a 30% tax credit through

December 2016.

“Geothermal”-- Heat from the earthNormal earth temperatures

Earth absorbs 47% of the sun’s energy that reaches it

Available everywhereNot associated with geysers

What Is Geothermal Energy?

Earth Temperatures

• A few feet below the surface, earth temperatures remain relatively constant and moderate.

• Ground temperatures are much milder than average monthly air temperatures.

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During the heating season, the earth serves as a heat _______. (HE - Heat of extraction)

During the cooling season, the earth serves as a heat _______. (HR - Heat of rejection)

Energy Source

During the heating season, the earth serves as a heat Source. (HE - Heat of extraction)

During the cooling season, the earth serves as a heat Sink. (HR - Heat of rejection)

Energy Source

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Ground Source Heat Pumps

Heat pumps “move” energy from one location to another, instead of creating heat by burning fossil fuels, such as a gas furnace does. -- (like your refrigerator).

Geothermal Heat Pumps use the earth to provide heating, cooling and hot water for your home.

The Second Law of ThermodynamicsEnergy (heat) flows spontaneously from an area of high concentration (hot body) to an area of low concentration (cold body).

Always hot to cold, never cold to hot

Cooling is actually the removal of heat

The heat moves through a liquid medium inside a loop system (Closed Loop) or through well-water (Open Loop)

Ground Source Heat Pumps

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Average Installed cost and future value of the earth loop

• Typical Pond Loop ~$700 – $1000 /ton• Typical Horizontal Loop ~$1100 - $1500 /ton• Typical Bohr Loop ~ $1800 - 2200 /ton• Typical Vertical Loop ~ $2200 – 2800 /ton

(Prices may vary by soil, location and geography.)

• Open Loop – Depends on many variables.

• What is the future value?

Average Installed cost and the value of the Geothermal Heat Pump and system design.

• Machine ASHRE rated life 24.7 years(almost twice the rated life of any combustions system)

• Average Machine cost ~$8,000 however???

• Design delivers lifelong comfort and is a one time investment.

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Heating Operation

HEATING

COOLING

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Geothermal has come a long way from the days of ignition and combustion.

With Geothermal both comfort and efficiency are built directly in.

Loop System Materials

High Density Polyethylene FlexibleHeat Fusion Capable

SocketButt

Horizontal and Vertical

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Horizontal Racetrack Design

Individual Channel Loop Installation

Vertical Bohr Installation

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U-BEND at Bottom of Bohr Grout inserted from bottom to the top of Bohr.

Directional Bohr Loop Installation

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Pond LoopRequires minimum of ½ acre private land

9 feet deep at most shallow season of the year

Flat Plate Heat Exchanger

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HDPE Loop Pipe Benefits

• High density polyethylene pipe (life expectancy of over 200 years)

• Does not rust, rot, or corrode • All connections are made by heat

fusion • 50 Year No Leak Pipe warranty

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Equipment Performance RatingsARI has designated the efficiency ratings for water-to-air heat pumps as:

Energy Efficiency Ratio (EER)EER = BTU output divided by power watt inputFor cooling operation under steady state test conditions

Coefficient of Performance (COP)COP = BTU output divided by BTU inputFor heating operation under steady state test conditions

Cooling Performance Ratings

Geothermal 17-41 EERAir Source Heat Pump 10-15 EERAir Conditioner 10-15 EER

Heating Performance Ratings

Geothermal (ground source) 3.5-6.0 COPAir Source Heat Pump 1.8-2.0 COPFossil Fuel Furnace 0.80-0.95 COPElectric Furnace/Baseboard/Ceiling Cable

1.00 COP

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2011 SCWBA Parade of Homes

Total Sq. Feet = 4,949-Heating load = 63,663Btuh-Cooling load = 41,306 Btuh

Geothermal Water to Air 5 ton system- 3 thermostat control zoning- Domestic hot water desuperheater

Cost to retrofit existing home with forced air geo system $17,685

Cost to replace conventional system with hybrid Gas $8,600

Difference between the two systems $9,085

Total Federal Tax Credit $5,305.50

Net Investment for Geothermal system after credits $3,779.50

For this home annual energy savings $900

The projected Break Even point in years 4.1 years

Case Study #1

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Cost to retrofit existing home with radiant and forced air geo system $31,000

Cost to replace conventional system $15,000

Difference between the two systems $16,000

Total Federal Tax Credit $9,300

Net Investment for Geothermal system after credits $6,700

If your loan is at 6% it would add this amount to your payment ($56.94)

This home has a monthly savings of $189.17

Created positive cash flow $132.23

The projected Break Even point in years 3.2

This home has projected Return on investment 6.5%

This home has an annual projected HVAC bill of $1,355

Case Study #2

What about the rated useful life of the equipment?Residual Value of the energy field?

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Geothermal Done Right !Requirements of HVAC Designer / Contractors:

1. ACCA Manual J (or Automated) Load CalculationsAppliance Heat GainsSolar Heat Gain / LossOccupancy Heat GainInfiltration Rates and Building Envelope

2. ACCA Manual S (or Automated) Duct CalculationsDuct gain or LossEnergy Flow and Distribution

Questions?THANK YOU !!!!!!!