Performance analysis of a proposed geothermal pile system for heating and cooling energy demand for a building in cold regions

Saaly, Maryam; Maghoul, Pooneh; Kavgic, Miroslava; Polyzois, Dimos

doi:10.1016/j.scs.2018.12.014

Cited by 32 publications

(17 citation statements)

References 26 publications

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“…The building foundation of consists of 119 concrete micro-piles designed for an ultimate limit state axial resistance of 1000 kN, which are embedded at the depth of -4.25 m below grade. Saaly et al [7] proposed a geothermal foundation system in which all the 119 piles were considered to be geothermal energy piles and were equipped with heat exchanger pipes to supply the SBEB energy demand (Fig. 1).…”

Section: Geothermal Energy Foundation Systemmentioning

confidence: 99%

“…The inlet temperature of fluid in the heat exchanger pipes varies between -1℃ during Nov-Apr and 20℃ during May-Oct, and has been determined to meet two main criteria: (i) meeting the thermal balance of the ground during heat extraction and rejection, (ii) avoiding freezing at the soil-pile interface [7]. Based on the results, up to 41% of the energy demand of the Stanley Pauley building can be supplied using a geothermal energy pile foundation system while meeting the two mentioned criteria [7]. Since temperature variation in the probes impacts the mechanical behaviour of the piles, the mechanical behaviour of a single geothermal pile in the foundation system of the SPEB is aimed to be studied in the following sections.…”

Section: Geothermal Energy Foundation Systemmentioning

confidence: 99%

“…Moreover, this additional dissipated heat from the building basement can ameliorate the potential thermal imbalance in the ground. In this regard, Saaly et al [7] conducted a study to determine the thermal capacity of a proposed hypothetical geothermal foundation system considering the heat loss through the basement of an institutional building in cold regions. The geothermal energy piles are subjected to both thermal loads due to temperature variations of the fluid heat exchanger whose magnitude is a function of the building heating and cooling demand as well as structural loads.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the effects of heat loss through below-grade envelope of buildings in urban areas on thermo-mechanical behaviour of geothermal piles

2020

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Harvesting geothermal energy through the use of thermo-active pile systems is an eco-friendly technique to provide HVAC energy demand of buildings. Mechanical behaviour of thermo-active piles is impacted by thermal cycles. Moreover, in urban areas, the temperature of the ground is higher than non-constructed areas due to the heat loss through the below-grade enclosure of buildings. This heat dissipation increases the thermal capacity of the soil and affects the mechanical response of the geothermal pile foundation subjected to thermo-mechanical loading. To investigate the effect of buildings heat loss on thermo-active piles, a numerical thermo-mechanical (TM) analysis was carried out on a proposed energy foundation system for an institutional building, the Stanley Pauley Engineering Building (SPEB) in the campus of the University of Manitoba, Winnipeg, Canada. The mechanical response of the geothermal piles to the thermal cycles with and without considering heat leakage through the basement of the SPEB is compared. Results showed that the cooling loads induced a maximum vertical pile head displacement of -1.18 mm. After 5 years operation of the system, the maximum vertical pile head displacement decreased to -1.05 mm for the case in which heat loss through the basement in considered in the models. In addition, the maximum axial load effective along the pile axis was 6% higher for the case that considers heat loss through the basement compared to the case without considering heat leakage through the building’s below-grade envelope.

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Section: Geothermal Energy Foundation Systemmentioning

confidence: 99%

Section: Geothermal Energy Foundation Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of the effects of heat loss through below-grade envelope of buildings in urban areas on thermo-mechanical behaviour of geothermal piles

2020

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“…During the cooling seasons, the heat exchange fluid inlet temperature was assumed as 20℃(Manitoba Hydro, 2009) Saaly, Maghoul, Kavgic, and Polyzois (2019). concluded the heating months range from October to April and the cooling months range from May to September in Winnipeg; these conditions were assumed for this study.…”

mentioning

confidence: 99%

“…The sewage was also represented with a constant temperature of 15℃ based on averaged sewage water inflow data. The heat exchange fluid inlet was modelled with a constant temperature of 1℃ during the heating season(Liu et al, 2019) and with 20°C during cooling season(Saaly et al, 2019).…”

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confidence: 99%

Evaluation of an integrated sewage pipe with ground heat exchanger for long-term efficiency estimation

et al. 2020

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Extracting heat from a sewage pipe through a typical horizontal ground heat exchanger has recently been introduced as a renewable energy alternative to reduce fossil fuel usage. This paper presents a novel design for a ground heat exchanger that extracts heat from the surrounding soil and sewage within the pipe while simultaneously being carried to a wastewater treatment plant. This research focuses on the long-term efficiency of the system under transient conditions in a cold climate. A numerical model using COMSOL Multiphysics was developed to verify the sustainability of the system for over 25 years. The model used constant inlet fluid temperatures to evaluate heat by conductive and convective heat transfer mechanisms within the pipe and surrounding soils by considering phase change of pore water. The results showed, by adopting the operation strategy proposed in this study, a maximum temperature change in the surrounding soil adjacent to the heat extraction system over 25 years was 0.10°C during the heating season in Winnipeg, Manitoba. The horizontal distance at which the heat extraction system did not show an impact on temperature change of adjacent soil was determined at 4 meters. Critical parameters in this evaluation were system depth, sewage level, and the high-density polyethylene pipe thermal properties. The sustainability of the system was not affected by the system depth due to thermal balancing between climatic, subsurface and sewage heat fluxes. Sustainable behavior was achieved at 50% and 75% of sewage pipe capacity. The effect on thermal performance from the high-density polyethylene pipe thermal properties was deemed insignificant.

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The co-movements between geothermal energy usage and CO2 emissions through high and low frequency cycles

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et al. 2020

Environ Sci Pollut Res

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Performance analysis of a proposed geothermal pile system for heating and cooling energy demand for a building in cold regions

Cited by 32 publications

References 26 publications

Investigation of the effects of heat loss through below-grade envelope of buildings in urban areas on thermo-mechanical behaviour of geothermal piles

Investigation of the effects of heat loss through below-grade envelope of buildings in urban areas on thermo-mechanical behaviour of geothermal piles

Evaluation of an integrated sewage pipe with ground heat exchanger for long-term efficiency estimation

The co-movements between geothermal energy usage and CO2 emissions through high and low frequency cycles

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