Long-term energy performance of thermal caisson geothermal systems

Alavy, Masih; Shirazi, Peimaneh; Rosen, Marc A.

doi:10.1016/j.enbuild.2023.113152

Cited by 20 publications

(5 citation statements)

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“…The coefficient of performance (COP), energy efficiency ratio (EER), and efficiency are three significant factors in determining the energy consumption of HVAC systems, which is an important element that can affect the environment. Several studies have shown that, due to the unbalanced heating and cooling load profiles in heating-dominated regions, the heating COP of a GSHP will decline due to the soil temperature variation each year [9,[40][41][42]. To quantify the impact of time on the heating COP of the system, Alavy et al [9] introduced two formulas for the COP of conventional and thermal caisson GSHP systems:…”

Section: Resultsmentioning

confidence: 99%

“…Several studies have shown that, due to the unbalanced heating and cooling load profiles in heating-dominated regions, the heating COP of a GSHP will decline due to the soil temperature variation each year [9,[40][41][42]. To quantify the impact of time on the heating COP of the system, Alavy et al [9] introduced two formulas for the COP of conventional and thermal caisson GSHP systems:…”

Section: Resultsmentioning

confidence: 99%

“…The case study considered for this study is a 150 m 2 heating-dominated detached house in Ontario, Canada. The building's real hourly heating and cooling loads and yearly demand are provided by Alavy et al [9,22]. Based on the provided results, the peak heating and cooling loads are 7.5 kW and 4 kW, respectively.…”

Section: Case Study Detailsmentioning

confidence: 99%

“…Many studies have shown that the ground source heat pump is one of the best alternatives for conventional HVAC systems to help achieve energy and emission reductions as ground source heat pump systems use the free and abundant energy in the ground to heat and cool buildings [6][7][8][9][10]. Despite their higher coefficient of performance (COP) values, studies show that GSHP systems have some drawbacks, including higher upfront costs and COP degradation over time, particularly for buildings with highly imbalanced heating and cooling requirements.…”

Section: Introductionmentioning

confidence: 99%

“…Based on their results, the capital cost of the GSHP could be reduced by 49% when utilizing TCs, and the operating costs could drop by 30% due to the better average COP, specifically in colder months [22]. In addition, another study by Alavy et al [9] has shown that a TC GSHP system can have a 22% better long-term energy performance compared to that of a conventional GSHP system.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of Environmental Impacts of Thermal Caisson Geothermal Systems

Abbasi,

Alavy,

Belansky

et al. 2024

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This paper investigates the total environmental impacts of a thermal caisson (TC) system by implementing a life cycle assessment methodology. The total environmental impacts consider the comprehensive effect on the environment across two life cycle stages: manufacturing and operation. A comparison between the TC results and two different HVAC systems, including air-conditioning/furnace and conventional ground-source heat pump (GSHP) systems, was made by adopting the ReCiPe 2016 methodology. This study reveals that the operation phase is the predominant contributor to environmental impacts across systems, mainly due to its extended duration. Specifically, the operational impacts of GSHPs are substantial, accounting for approximately 87% of total environmental impacts. A TC GSHP system demonstrates a notable environmental advantage, achieving a 79% reduction in total environmental impact when compared to traditional AC/furnace systems. This represents a 21% improvement over conventional GSHP systems. Despite this substantial reduction in total environmental impact, the TC GSHP system shows an almost 5% increase in the resource availability damage category relative to the conventional GSHP, which is attributed to its higher material consumption. These results highlight the TC GSHP system’s superior efficiency in reducing environmental impacts and its potential as a more sustainable alternative in residential heating and cooling applications.

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