Research Objective Methodology Building description ...
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Research Objective Methodology Building description ...
Study on Energy Foundation Design in South Louisiana. MdAdnan Khan. 1 and Jay Wang. 1. 1. Louisiana Tech University. Research Objective. ⢠A case study of ...
Study on Energy Foundation Design in South Louisiana 1
1
MdAdnan Khan and Jay Wang 1 Louisiana Tech University Research Objective A case study of Geothermal energy output using typical pile foundation in
Results and discussion
Schematic diagram of an energy pile (b)
(a)
South Louisiana. A comparison of annual HVAC (Heating, venting and air conditioning) cost between geothermal energy with other common source of energy. Comparison of CO2 emission by geothermal energy with other energy sources.
Cooling building
Heating building
Constant circulation of fluid in the Utube to draw heat energy in the soil
TU-tube inlet < TSoil
Methodology
Constant circulation of fluid in the Utube to dump heat energy in the soil
TU-tube inlet > TSoil
Heat Pump
Heat Pump
Heat Pump kWh Use (Heating) Auxiliary Heat kWh Use Heat Pump kWh Use (Cooling)
1. Measure HVAC load
Constant heat flux of soil, first round of heat transfer between soil and energy pile
3. Soil parameters Soil temperature Soil thermal conductivity Soil moisture content Soil type Measure the output geothermal energy. Evaluating cost efficiency compare to conventional energy source. Computation of CO2 emission of geothermal energy compare to other energy source
Analyze the data
Energy pile design
Building Location
New Orleans
Total number of energy pile
16
Energy pile spacing
8.55m (28.06´) 0
Soil temperature
Fig 3. Annual energy consumption
Fig 1. A flowchart of design procedure in the case study
Four story building. 2 2 Each of the upper floors provides 696.77 m (7,500 ft ) of office space. The building is supported by 0.33 m (12.75 in) diameter open-ended steel H
0
47.06 C (116.7 F) 0
0
Fluid outlet temperature
3 C (37.4 F)
Fluid circulation pump
1492-Watt (2 HP) , 85% efficient
Fluid type
Water (100% by weight) -3
Fig 5. Comparison of annual CO2 emission
3
Fluid discharge
0.757×10 m /s (12gpm)
Minimum fluid velocity
0.61 m/s (2 fps)
U-tube type
SDR 11 (40 mm)
No of U-tube
One U-tube in one energy pile
Energy pile diameter
0.33m (12.75in)
Table 3. Total output of energy pile
Cooling load (kW/hr)
21.89%
Annual running time for heating load at peak load
piles with a wall thickness of 0.0064 m (0.25 in). The design compressive capacity of the pile foundation is 498.2 kN (50 tons) and the tensile capacity is 249.1 kN (25 tons). According to the consultant provided geotechnical report, a pile depth of 24.384 m (80 feet) is used.
0
0
Annual running time for cooling load at peak load
Building description
Fig 4. Comparison of HVAC cost
19.44 C (67 F)
Fluid inlet temperature
6. Fluid Parameter Type of circulating fluid Fluid design velocity Fluid design discharge Fluid design inlet/outlet temperature in the U-tube Fluid thermal conductivity
Third round of coupling between HDPE pipe and circulating turbulent flow
Table 1. Summary of design parameters
5. Energy pile Energy pile diameter Energy pile spacing Total no of Energy pile Concrete thermal conductivity
Constant heat flux of soil, first round of heat transfer between soil and energy pile
Second round of coupling between grout and HDPE pipe
Fig 2. Schematic diagram of energy pile heat exchanger in (a) winter and (b) summer
4. U-tube parameter No of U-tube in one energy pile Diameter of U-tube U-tube thermal conductivity
Third round of coupling between HDPE pipe and circulating turbulent flow
Second round of coupling between grout and HDPE pipe
Heating load (kW/hr)
57%
Floor nd
rd
2 ,3
th
and 4
147.27
% of run time in Heating Load (kW/ % of run time in cooling mode hr) heating mode 21.9
39.54
147.27 29.31 19.90 39.54 26.93 68.12
Acknowledgements
Table 2. HVAC load of the building using the LEED Plus software Cooling Load (kW/ hr)
Max Demand Extraction from Energy Pile % Max Demand Extraction from Energy Pile %
57
The authors would like to express their gratitude to Louisiana Board of Regents. The work presented in the paper was a part of the project granted by the NSF-EPSCoR program in the contract LEQSF-EPS(2012)-PFUND-286.
