Use of Geothermal Energy in Snow Melting and Deicing of Transportation Infrastructures
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1 Use of Geothermal Energy in Snow Melting and Deicing of Transportation Infrastructures Guney Olgun Civil & Environmental Engineering, Virginia Tech Allen Bowers Schnabel Engineering Moderator : Andy Alden, Virginia Tech Transportation Institute Transportation Research Board July 21, 2016
2 Webinar Outline Background and concept Geothermal heat-exchange systems Applications related to transportation infrastructure Examples from recent research on bridge deck deicing Summary and conclusions
3 Learning Objectives Identify near-surface geothermal energy and heat exchange systems Understand different applications of geothermal energy in transportation systems Identify different case histories and research projects Understand the basic design principles of geothermal heat exchange systems
4 Webinar Outline Background and concept Geothermal heat-exchange systems Applications related to transportation infrastructure Examples from recent research on bridge deck deicing Summary and conclusions
5 U.S. Energy Flow Chart Lawrence Livermore National Lab (2009) Significant energy consumption in buildings mainly for heating and cooling
6 U.S. Geothermal Resources & Projects
7 Ground Temperatures & Heat Exchange 0 Fall Spring 10 Winter Summer 20 Depth (ft) Washington, DC Tmean = 57 F Ground Temperature ( F) Seasonally constant temperature and the thermal storage capacity of the ground can be leveraged for geothermal heat exchange 70
8 Ground Temperature Profile 0 Fall Spring 10 Winter Summer Depth (ft) Mean ground temperature Houston, TX T mean = 72 F Ground Temperature ( F)
9 Geothermal Heat-Exchange Systems Primary circuit Secondary circuit Connecting lines Manifolds Fall Winter Spring Summer Header block: Heat pump collector (for heating) distributor (for cooling) P P 30 Depth (ft) External power (electricity) Lawrence, KS T mean = 55 F Ground Temperature ( F) Geothermal loops 3 4 Energy flux 4 4 (from the ground) Utilize the relatively constant temperature of the ground and use it for heating in the winter and cooling in the summer
10 Ground Source Heating/Cooling Geothermal heat exchange systems provide ground-source energy for heating and cooling The use of ground-source systems for heating and cooling has increased exponentially especially in Europe Basic idea been around for long time make use of the heat energy stored in the ground; access this energy using heat exchangers buried in the ground (fluid-filled HDPE loops) In ideal conditions these systems can provide majority of required heating/cooling energy and significantly reduce costs and carbon footprint
11 Geothermal Heat-Exchange Systems Primary circuit Secondary circuit Connecting lines Manifolds Fall Winter Spring Summer Header block: Heat pump collector (for heating) distributor (for cooling) P P 30 Depth (ft) External power (electricity) Lawrence, KS T mean = 55 F Ground Temperature ( F) Geothermal loops 3 4 Energy flux 4 4 (from the ground) Utilize the relatively constant temperature of the ground and use it for heating in the winter and cooling in the summer
12 Geothermal Resources WA OR CA NV MT ID UT WY CO ND SD NE MN IA MO WI IL MI IN OH WV NY VT PA ME AZ NM KS TX OK AR TN MS VA NC AL GA SC LA FL Temperatures above 212F Temperature above 100 o C (212 o F) Temperature below 100 o C (212 o F) Temperatures below 212F Area suitable for "Geothermal Foundation (entire U.S.) Suitable for geothermal heat exchange (entire U.S.)
13 Webinar Outline Background and concept Geothermal heat-exchange systems Applications related to transportation infrastructure Examples from recent research on bridge deck deicing Summary and conclusions
14 Geothermal Heat Exchange Systems Geothermal Boreholes Horizontal Loops Energy Piles
15 Geothermal Borehole Wells 4-6 inch diameter borehole 200 ft ft deep Small residential to large commercial Major cost is drilling and materials
16 Geothermal Borehole Wells
17 Geothermal Borehole Wells Design Considerations Spacing Backfill Material (Thermal Grout) Single U-bend or Double U-bend Ground properties: Temperature Thermal conductivity Thermal diffusivity Ground water Long-term effects
18 Horizontal Loops 6-10 ft
19 Horizontal Loops Recently built house in Blacksburg, VA with a trench loop system
20 Horizontal Loops Horizontal loop systems within/beneath slabs
21 Geothermal Energy Piles 55 F 80 F
22 Geothermal Energy Piles Dual Purpose Elements Deep Foundation Geothermal Loops Energy Pile + = Foundation support (micropile, drilled shaft, CFA) Heating/cooling (PEX, HDPE) Foundation support & heating/cooling
23 Geothermal Energy Piles Dual Purpose Elements ~30 F 57 F 0 Fall Spring 10 Winter Summer 20 Depth (ft) Washington, DC Tmean = 57 F Ground Temperature ( F)
24 Performance of Heat Exchange Systems Vertical Horizontal Energy Pile Poor ground quality 8 W/ft 1 W/ft² 8 W/ft Average ground quality 15 W/ft 2.5 W/ft² 15 W/ft Excellent ground quality 25 W/ft 4 W/ft² 25 W/ft 1W ~ 3.4Btu/hr
25 Frankfurt Main Tower 223 Energy piles were installed Power : 500kW Courtesy : R. Katzenbach, Technical University of Darmstadt
26 Keble College, Oxford UK First Energy Wall Project in the UK Completion: 2002 Type of Absorber: Pile wall, 61 drilled shafts Heating Capacity: 45 kw Cooling Capacity: 45 kw Courtesy : Tony Amis, Geothermal International
27 Geothermal Bridge Deck Deicing Fluid Flows from Energy Piles and Embankment to the Bridge Deck Plan View of the Bridge Deck Loops Embedded in the Embankment Heat exchanger foundation elements can be used to deice bridge decks in the winter. Can reduce bridge deck deterioration and aging. Bridge deck and the tubing system can be used for heat collection in the summer. Can also utilize the approach embankment as a thermal mass for heat storage and extraction. Energy Piles
28 Energy Tunnels Energy tunnel/anchor systems (Brandl 2006) Heat can be harvested from tunnels with the use of heat exchanger systems
29 Energy Tunnels Energy tunnel/anchor systems (Brandl 2006)
30 Webinar Outline Background and concept Geothermal heat-exchange systems Applications related to transportation infrastructure Examples from recent research on bridge deck deicing Summary and conclusions
31 Geothermal Applications for Transportation Airports Runway deicing Terminal heating/cooling Road deicing and summer cooling Roadside facility heating/cooling Bridge deck deicing and stress control
32 Airport Applications Terminal heating/cooling Terminals can account for 75% of an airport s energy requirements Of that, 25-80% is required for HVAC Significant savings could be realized by utilizing geothermal energy Nashville International Airport currently implementing this and expected to save more than $430,000/yr
33 Airport Applications Terminal heating/cooling Zurich Airport Terminal E 310 of the 440 piles are energy piles, 30 m (100 ft) each Supplies 85,200 m 2 Heating seasonal performance factor of 3.9 Cooling seasonal performance factor of 2.7
34 Airport Applications Runway and Apron Deicing Usually airports employ a combination of mechanical and chemical methods: plows, salts, sand, etc. Each time a plow has to clear the runway, operations are slowed Chemicals can be damaging to the environment and runway concrete A lot of ground volume beneath runways that could be utilized for geothermal energy Note: Geothermally heated hot water could potentially be used to deice the planes Example: Apron deicing at Greater Binghamton Airport, NY
35 Airport Applications Apron Deicing at Greater Binghampton Airport $1,300,000 in construction costs 4,000ft 2 of apron and walkway heated area Twenty 500ft vertical and two 140ft horizontal geothermal wells Operating costs - $15,000/yr or $0.16/passenger Utilized for terminal cooling in the summer
36 Road Deicing and Summer Cooling During winter storm events, roads can often be covered with snow/ice. Dangerous for motorists Expensive to remove (plowing) Can be damaging to environment (from deicing chemicals) During the summer, the cyclic heating and cooling can degrade the pavement Geothermal energy can heat the roads in the winter and cool them during the summer Example: SERSO road in Switzerland
37 Road Deicing SERSO Pilot Plant in Switzerland (EGEC 2007) Collects heat during summer and stores in ground for winter 91 borehole heat exchangers to a depth of 70 m
38 Roadside Facility Heating/Cooling Tollbooths and toll plazas Vehicles approach toll plazas at a high rate of speed and decelerate quickly This can be dangerous during winter weather for both motorists and tollbooth operators Can geothermally heat the pavements of the toll plaza to prevent snow and ice formation/accumulation Can also heat the tollbooths and cool them in the summer
39 Bridge Deck Deicing and Stress Control Winter weather-related problems with bridge decks: Preferential icing Accelerated corrosion (from chemicals) Environmental contamination (from chemicals) Cyclic stressing and straining of bridges in the summer can also be problematic and lead to accelerated deterioration
40 Ground-Source Bridge Deck Deicing Ground-source deicing: Fluid is warmed as it circulates through the energy piles and approach embankment and then circulated in the deck, heating the deck Can be operated in reverse during the summer Not meant to replace mechanical removal
41 Webinar Outline Background and concept Geothermal heat-exchange systems Applications related to transportation infrastructure Examples from recent research on bridge deck deicing Summary and conclusions
42 Experimental Investigation The Setup: Two 1.3m x 3.3m x 25cm doubly reinforced concrete slabs PEX circulation tubes Loops spaced 20 and 30cm Total of 36 thermistors Four 33m Energy Piles Spaced 2.6m apart Only 1 used for the experimental results Three observation boreholes to monitor temperature
43 Model-Scale Experiments 20cm Legend Center of deck surface; directly over tube Center of deck surface; between tubes 30cm Legend Center of deck surface The Setup: One side was heated (20cm), other side was left as a control (30cm) Temperature was measured in all 36 thermistors, but only showing the results from 3 near the deck surface
44 Experimental Results Mild Winter Storm: January 21, cm of snow fell while ambient temperature was -0.5 o C Turned on system before the start of snowfall and left running during snowfall The side that was operated remained snow free the entire time
45 Mild Winter Storm Temperature, o C Heated - Above Tube Heated - Between Tubes Non-Heated Ambient Air Cumulative Snowfall Jan 21 Jan 22 Jan 23 Date Cumulative Snowfall, cm
46 Moderate Winter Storm Moderate Winter Storm: February 25-26, cm (3 in) of snow fell while the ambient air temperature was -2 to -3 o C Turned on system before the start of snowfall and left running during snowfall The side that was operated had a surface temperature >0 o C the entire time and remained snow-free
47 Moderate Winter Storm 15 8 Temperature, o C Feb 25 Feb 26 Feb 27 Date Heated - Above Tube Heated - Between Tubes Non-Heated Ambient Air Cumulative Snowfall Cumulative Snowfall, cm
48 Bridge Deck Temperature Gradients
49 Bridge Deck Temperature Gradients 1.5 Thermal Recharge No Operation 1.0 Thermal gradient, o C/cm Top Gradient Middle Gradient Bottom Gradient :00 18:00 00:00 06:00 12:00 18:00 00:00 June 14-15, 2014
50 Bridge Deck Temperature Gradients 1.5 Thermal Recharge Operation 1.0 TR Operation Thermal gradient, o C/cm Top Gradient Middle Gradient Bottom Gradient Top Grad - Btwn Middle Grad - Btwn :00 18:00 00:00 06:00 12:00 18:00 00:00 June 16-17, 2014
51 Summary of Experimental Tests Tests in mild, moderate, and severe winter storms demonstrated: The system was capable of handling moderate amounts of snow in moderate weather conditions without the need of external energy (heat pump) Whenever the system was not capable of handling the snow by itself, it was able to maintain a surface temperature above 0 o C when combined with mechanical removal a snow-free surface will exist The system is self-adjusting when more energy is needed it is able to generate it (through gradients) Operation of system in summer reduces the extreme temperature gradients experienced by the bridge deck
52 Numerical Modeling of Bridge Heating Modeled the experimental bridge deck slab for validation.
53 Understanding System Performance Time how long does it take to heat? Temperature can the bridge deck maintain a temperature above freezing? Energy how much energy is this process requiring? Snow-Free is the system able to keep the deck snow free? If not, is it able to melt it? Examined: Ambient and initial temperature Inlet fluid temperature Wind speed Rate of snowfall Circulation tube spacing Fluid flow rate Concrete thermal conductivity Concrete heat capacity Insulation under the slab
54 Parametric Study - Tube Spacing Surface temperature distribution for 15, 20, 25, and 30 cm tube spacing when the average surface temperature = 0 o C
55 Parametric Study - Tube Spacing Average surface temperature as compared to the total (top) surface area greater than 0 o C Average Surface Temperature, o C Spacing, cm Temperature Area Portion of Deck Above 0 o C Time, hr
56 Summary of Numerical Research 3-Dimensional numerical models have been developed to simulate bridge deck deicing using geothermal energy Parametric analyses have showed the feasibility of these systems over a wide range of conditions The results from the analyses have been used to develop design tables that will be published
57 Summary and Conclusions Ground can be utilized as a renewable energy source as a result of its relatively constant temperatures and thermal storage capacity. Use of geothermal heat exchangers can be an environmental friendly and feasible way for heating and cooling of transportation facilities. There are a variety of geothermal heat exchange technologies including, borehole heat exchangers, geothermal energy piles, etc. The applications related to transportation infrastructure includes deicing of bridge decks and airport runways, heating and cooling of airport terminals, roadside facilities. Potential issues with long term performance of bridge deck deicing systems due to continued heat extraction. Thermal recharge may need to be utilized to provide supplemental heat energy.
58 Thank You! Transportation Research Board July 21, 2016 TRB Technical Committee AFP40 Physicochemical and Biological Processes in Soils
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