1/11/2016
1
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.
1/11/2016
2
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
1/11/2016
3
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.
1/11/2016
4
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
1/11/2016
5
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
1/11/2016
6
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.
1/11/2016
8
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
1/11/2016
9
Horizontal Racetrack Design
Individual Channel Loop Installation
Vertical Bohr Installation
1/11/2016
10
U-BEND at Bottom of Bohr Grout inserted from bottom to the top of Bohr.
Directional Bohr Loop Installation
1/11/2016
11
Pond LoopRequires minimum of ½ acre private land
9 feet deep at most shallow season of the year
Flat Plate Heat Exchanger
1/11/2016
12
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
1/11/2016
13
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
1/11/2016
14
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
1/11/2016
15
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?
1/11/2016
19
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 !!!!!!!
Top Related