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Thermal Energy Management in the
Built Environment
Presented by:
Yale Carden, Managing Director, GeoExchange Australia Pty Ltd and
Jo Spicer, Environmental / GIS Officer, Tumut Shire Council
3 June 2015
Using the Ground for Thermal Energy Storage:
The Experience of the Riverina Highlands Building,
Tumut NSW
Presentation Overview
 Why Thermal Energy Storage?
 Thermal is Energy Too
 Ground Heat Exchanger as Thermal Energy Storage
 The Riverina Highlands Building Energy Efficiency Project (RHBEEP)
 Contacts
Australian Energy Storage Conference: 3-4 June 2015
Why Thermal Energy Storage
 Up to 80 % annual energy savings
 Reduce peak load up to 50 %
 Remove cooling towers
 Remove external plant and free up building design
 Disconnect natural gas and other fossil fuels
 Increase renewables potential for full load capacity
 Easily integrates with other energy solutions
Australian Energy Storage Conference: 3-4 June 2015
Thermal is Energy Too
 ClimateWorks: Top 10 Energy Productivity Solutions
 Thermal energy can also be renewable – not just gas and fossil fuels
 Thermal sources in the built environment:
 Atmosphere
 Ground
 Building Foundations / Car Parks
 Water Bodies
 Sewer and Wastewater
 Other Buildings
 Flexibility to optimise demand requirements with available source(s):
 Heating, cooling and hot water demands:
 Simultaneous
 Diurnal
 Seasonal
 Available thermal sources – mix and match
Australian Energy Storage Conference: 3-4 June 2015
Geoexchange: Thermal Connectivity
Australian Energy Storage Conference: 3-4 June 2015
Distribution –
Heating and
Cooling
Ground Heat
Exchanger
Refrigeration Circuit –
Ground Source Heat
Pump
Hot Water
Circuit
Ground Heat Exchangers
 Use of constant, stable temperatures as:
 Heat Source (heating)
 Heat Sink (cooling)
 Thermal Energy Storage
 Generic term that includes the ground, water bodies, sewer, building
foundations
Australian Energy Storage Conference: 3-4 June 2015
Ground and Water Loops
Australian Energy Storage Conference: 3-4 June 2015
Energy Piles
Australian Energy Storage Conference: 3-4 June 2015
Sewer Heat Recovery
Australian Energy Storage Conference: 3-4 June 2015
 Also includes wastewater / treated effluent
 Not just heating – cooling also possible
 20-25C heat source / sink is common
 Match ‘water’ flow to heating / cooling requirements
 Local projects using treated effluent:
 Hobart Aquatic Centre, Hobart
 Grand Chancellor Hotel, Hobart
Aquifer Thermal Energy Storage
Australian Energy Storage Conference: 3-4 June 2015
Source: www.building.co.uk
District Geoexchange Systems
Australian Energy Storage Conference: 3-4 June 2015
Case Study: Tumut Council, NSW
Australian Energy Storage Conference: 3-4 June 2015
The Situation
Australian Energy Storage Conference: 3-4 June 2015
 A thermally inefficient building
 Summers were hot and uncomfortable. Winter was not much better
 The HVAC plant failed on a regular basis
 HVAC simply did not meet the building occupant’s requirements
 Inefficient and expensive lighting
Objectives and Actions
Australian Energy Storage Conference: 3-4 June 2015
 Riverina Highlands Building Energy Efficiency Project (RHBEEP)
objectives:
 Reduce energy expenditure
 Reduce reliance on imported energy
 Reduce GHG (Green House Gas) emission
 Improve comfort levels in the building
 What we did:
 GeoExchange HVAC/GSHP system installed
 Lighting upgrade
 Sub metering
 Ceiling insulation
The Installed System
Australian Energy Storage Conference: 3-4 June 2015
 The Ground Heat Exchanger:
 35 Boreholes
 92 m deep
 40 mm diameter polyethylene pipe
 7 m spacings
 Ground Source Heat Pumps:
 26 x WaterFurnace 7 series
 Variable speed compressor
 Variable speed fan
 Energy performance monitoring
 Pumping System:
 Variable speed pumps to match heating / cooling load
RHBEEP and Thermal Energy Storage
Australian Energy Storage Conference: 3-4 June 2015
Short term storage:
Simultaneous or diurnal
Annual storage
Heat
Rejection
Heat
Extraction
Heat
Rejection
Before and After: Building Energy
Australian Energy Storage Conference: 3-4 June 2015
Before and After: Building Energy
Australian Energy Storage Conference: 3-4 June 2015
Before and After: HVAC only
2012: 961 633 MJ
2014: 282 279 MJ
Australian Energy Storage Conference: 3-4 June 2015
Before and After: Ancillary Benefits
 RHBEEP is demonstration that:
 Integration of technologies
 Site specific design
 Programmed optimisation
 Is effective in
 Reducing energy consumption, whilst
 Maintaining a comfortable and pleasant
work environment
 Increased storage capacity in the
plant room by approximately 500%
Australian Energy Storage Conference: 3-4 June 2015
Before and After: Summary
 Building energy savings: ~80 % and $94 000 per annum
 HVAC energy savings: ~71 % and $85 000 per annum
 Maintenance / tenancy savings: ~$80 000 per annum
 Electricity demand reduction: 151 kVA (75 %) Geoexchange at 49 %
 GHG Reduction: 79 tCO2
 Simple Payback: ~7.6 years
 Return on Investment: 11-12 %
Australian Energy Storage Conference: 3-4 June 2015
Contact Details
Yale Carden
GeoExchange Australia Pty Ltd
IGSHPA – Australasia
Phone: 02 8404 4193
Email: ycarden@geoexchange.com.au
Website: www.geoexchange.com.au
Joanne Spicer
Tumut Shire Council
Phone: 02 6941 2555
Email: jspicer@tumut.nsw.gov.au
Website: www.tumut.nsw.gov.au
The RHBEEP Project
http://www.tumut.nsw.gov.au/riverina-highlands-building-energy-efficient-project-
rhbeep.aspx
Australian Energy Storage Conference: 3-4 June 2015

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Using the Ground for Thermal Energy Storage: The Experience of the Riverina Highlands Building, Tumut NSW

  • 1. Thermal Energy Management in the Built Environment Presented by: Yale Carden, Managing Director, GeoExchange Australia Pty Ltd and Jo Spicer, Environmental / GIS Officer, Tumut Shire Council 3 June 2015 Using the Ground for Thermal Energy Storage: The Experience of the Riverina Highlands Building, Tumut NSW
  • 2. Presentation Overview  Why Thermal Energy Storage?  Thermal is Energy Too  Ground Heat Exchanger as Thermal Energy Storage  The Riverina Highlands Building Energy Efficiency Project (RHBEEP)  Contacts Australian Energy Storage Conference: 3-4 June 2015
  • 3. Why Thermal Energy Storage  Up to 80 % annual energy savings  Reduce peak load up to 50 %  Remove cooling towers  Remove external plant and free up building design  Disconnect natural gas and other fossil fuels  Increase renewables potential for full load capacity  Easily integrates with other energy solutions Australian Energy Storage Conference: 3-4 June 2015
  • 4. Thermal is Energy Too  ClimateWorks: Top 10 Energy Productivity Solutions  Thermal energy can also be renewable – not just gas and fossil fuels  Thermal sources in the built environment:  Atmosphere  Ground  Building Foundations / Car Parks  Water Bodies  Sewer and Wastewater  Other Buildings  Flexibility to optimise demand requirements with available source(s):  Heating, cooling and hot water demands:  Simultaneous  Diurnal  Seasonal  Available thermal sources – mix and match Australian Energy Storage Conference: 3-4 June 2015
  • 5. Geoexchange: Thermal Connectivity Australian Energy Storage Conference: 3-4 June 2015 Distribution – Heating and Cooling Ground Heat Exchanger Refrigeration Circuit – Ground Source Heat Pump Hot Water Circuit
  • 6. Ground Heat Exchangers  Use of constant, stable temperatures as:  Heat Source (heating)  Heat Sink (cooling)  Thermal Energy Storage  Generic term that includes the ground, water bodies, sewer, building foundations Australian Energy Storage Conference: 3-4 June 2015
  • 7. Ground and Water Loops Australian Energy Storage Conference: 3-4 June 2015
  • 8. Energy Piles Australian Energy Storage Conference: 3-4 June 2015
  • 9. Sewer Heat Recovery Australian Energy Storage Conference: 3-4 June 2015  Also includes wastewater / treated effluent  Not just heating – cooling also possible  20-25C heat source / sink is common  Match ‘water’ flow to heating / cooling requirements  Local projects using treated effluent:  Hobart Aquatic Centre, Hobart  Grand Chancellor Hotel, Hobart
  • 10. Aquifer Thermal Energy Storage Australian Energy Storage Conference: 3-4 June 2015 Source: www.building.co.uk
  • 11. District Geoexchange Systems Australian Energy Storage Conference: 3-4 June 2015
  • 12. Case Study: Tumut Council, NSW Australian Energy Storage Conference: 3-4 June 2015
  • 13. The Situation Australian Energy Storage Conference: 3-4 June 2015  A thermally inefficient building  Summers were hot and uncomfortable. Winter was not much better  The HVAC plant failed on a regular basis  HVAC simply did not meet the building occupant’s requirements  Inefficient and expensive lighting
  • 14. Objectives and Actions Australian Energy Storage Conference: 3-4 June 2015  Riverina Highlands Building Energy Efficiency Project (RHBEEP) objectives:  Reduce energy expenditure  Reduce reliance on imported energy  Reduce GHG (Green House Gas) emission  Improve comfort levels in the building  What we did:  GeoExchange HVAC/GSHP system installed  Lighting upgrade  Sub metering  Ceiling insulation
  • 15. The Installed System Australian Energy Storage Conference: 3-4 June 2015  The Ground Heat Exchanger:  35 Boreholes  92 m deep  40 mm diameter polyethylene pipe  7 m spacings  Ground Source Heat Pumps:  26 x WaterFurnace 7 series  Variable speed compressor  Variable speed fan  Energy performance monitoring  Pumping System:  Variable speed pumps to match heating / cooling load
  • 16. RHBEEP and Thermal Energy Storage Australian Energy Storage Conference: 3-4 June 2015 Short term storage: Simultaneous or diurnal Annual storage Heat Rejection Heat Extraction Heat Rejection
  • 17. Before and After: Building Energy Australian Energy Storage Conference: 3-4 June 2015
  • 18. Before and After: Building Energy Australian Energy Storage Conference: 3-4 June 2015
  • 19. Before and After: HVAC only 2012: 961 633 MJ 2014: 282 279 MJ Australian Energy Storage Conference: 3-4 June 2015
  • 20. Before and After: Ancillary Benefits  RHBEEP is demonstration that:  Integration of technologies  Site specific design  Programmed optimisation  Is effective in  Reducing energy consumption, whilst  Maintaining a comfortable and pleasant work environment  Increased storage capacity in the plant room by approximately 500% Australian Energy Storage Conference: 3-4 June 2015
  • 21. Before and After: Summary  Building energy savings: ~80 % and $94 000 per annum  HVAC energy savings: ~71 % and $85 000 per annum  Maintenance / tenancy savings: ~$80 000 per annum  Electricity demand reduction: 151 kVA (75 %) Geoexchange at 49 %  GHG Reduction: 79 tCO2  Simple Payback: ~7.6 years  Return on Investment: 11-12 % Australian Energy Storage Conference: 3-4 June 2015
  • 22. Contact Details Yale Carden GeoExchange Australia Pty Ltd IGSHPA – Australasia Phone: 02 8404 4193 Email: ycarden@geoexchange.com.au Website: www.geoexchange.com.au Joanne Spicer Tumut Shire Council Phone: 02 6941 2555 Email: jspicer@tumut.nsw.gov.au Website: www.tumut.nsw.gov.au The RHBEEP Project http://www.tumut.nsw.gov.au/riverina-highlands-building-energy-efficient-project- rhbeep.aspx Australian Energy Storage Conference: 3-4 June 2015

Editor's Notes

  1. A district geoexchange system addresses both requirements for todays presentations through a distributed utility approach to the heating / cooling of buildings. Image on right is a ‘single building’ geoexchange system using vertical GHX. Image on left is system at Ball State Uni, Indiana that replaced an ~100 year old coal boiler. ~4000 boreholes provide nearly 30MW of heating/cooling to the entire campus.
  2. Reduced energy consumption, including peak loads. Thisenhances capability of local renewable energy generation to provide higherpercentage of overall energy usage; Reduced water consumption through removal of cooling towers; Removal of gas from site infrastructure as all heating / cooling is electrically powered. Once again this enhances potential of local renewable energy generation and ensures future flexibility with respect topower (ie not being limited by gas connection); Dual use of existing utilities (eg use of low grade heat from sewer, wastewater, irrigation systemsetc for both heating / cooling).
  3. Reduced energy consumption, including peak loads. Thisenhances capability of local renewable energy generation to provide higherpercentage of overall energy usage; Reduced water consumption through removal of cooling towers; Removal of gas from site infrastructure as all heating / cooling is electrically powered. Once again this enhances potential of local renewable energy generation and ensures future flexibility with respect topower (ie not being limited by gas connection); Dual use of existing utilities (eg use of low grade heat from sewer, wastewater, irrigation systemsetc for both heating / cooling).
  4. Reduced energy consumption, including peak loads. Thisenhances capability of local renewable energy generation to provide higherpercentage of overall energy usage; Reduced water consumption through removal of cooling towers; Removal of gas from site infrastructure as all heating / cooling is electrically powered. Once again this enhances potential of local renewable energy generation and ensures future flexibility with respect topower (ie not being limited by gas connection); Dual use of existing utilities (eg use of low grade heat from sewer, wastewater, irrigation systemsetc for both heating / cooling).