Techno-economic assessment of the horizontal geothermal heat pump systems: A comprehensive review

Cui, Yuanlong; Zhu, Jun; Twaha, Ssennoga; Chu, Junze; Bai, Hongyu; Huang, Kuo Chan; Chen, Xiangjie; Zoras, Stamatis

doi:10.1016/j.enconman.2019.04.018

Cited by 91 publications

(34 citation statements)

References 55 publications

(92 reference statements)

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“…Previous studies on GSHP systems [24,25] have shown that final COP depends on system configuration and local site conditions (e.g., the BHEs setup, the climate, the ground properties, and the HP nominal power), as well as the transient operative conditions of the system's duty-cycle: the ground's undisturbed temperature, the temperature difference between the surface and the underground, and the temperature of the water leaving the heat pump and the BHEs. These temperature fluctuations lower the system COP.…”

Section: Introductionmentioning

confidence: 99%

Environmental Performance of Innovative Ground-Source Heat Pumps with PCM Energy Storage

Bonamente

Aquino

2019

Energies

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Space conditioning is responsible for the majority of carbon dioxide emission and fossil fuel consumption during a building’s life cycle. The exploitation of renewable energy sources, together with efficiency enhancement, is the most promising solution. An innovative layout for ground-source heat pumps, featuring upstream thermal energy storage (uTES), was already proposed and proved to be as effective as conventional systems while requiring lower impact geothermal installations thanks to its ability to decouple ground and heat-pump energy fluxes. This work presents further improvements to the layout, obtained using more compact and efficient thermal energy storage containing phase-change materials (PCMs). The switch from sensible- to latent-heat storage has the twofold benefit of dramatically reducing the volume of storage (by a factor of approximately 10) and increasing the coefficient of performance of the heat pump. During the daily cycle, the PCMs are continuously melted/solidified, however, the average storage temperature remains approximately constant, allowing the heat pump to operate closer to its maximum efficiency. A life cycle assessment (LCA) was performed to study the environmental benefits of introducing PCM-uTES during the entire life cycle of the system in a comparative approach.

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Section: Introductionmentioning

confidence: 99%

Environmental Performance of Innovative Ground-Source Heat Pumps with PCM Energy Storage

Bonamente

Aquino

2019

Energies

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“…GHPs, also known as Ground-Source Heat Pumps, typically result in less annual energy consumption when compared to conventional systems. Of the portion of energy cost associated with the HVAC system, the consumption savings is in the range of 30% to 60% over common residential HVAC systems such as an air-source heat pumps or forced air furnace with split-system air conditioning [5][6][7]. While GHPs are more energy efficient compared to air-source heat pumps and forced-air furnace systems, previous research studies identified key barriers that inhibit GHP widespread industry growth including 1) High capital cost for ground loops, 2) Low market awareness, 3) lack of knowledge in GHP benefits, and 4) Infrastructure limitations including a limited number of qualified and experienced installers [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Many studies exist on geothermal energy, GHPs, and the installation and payback period of these systems for commercial and residential facilities [5][6][7] with many focusing on simulations of GHP systems [7,8,13] or field performance for GHPs in climates with high heating demand [14]. Limited information is known about the costs and payback period of GHPs for residential homes in hot and humid climates using field performance data.…”

Section: Introductionmentioning

confidence: 99%

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Comparing Geothermal Heat Pump Systems to Conventional HVAC Systems in Hot and Humid Climates

Tapia¹,

Harper²

2021

J. Civ. Eng. Constr.

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Geothermal heat pump (GHP) systems are more concentrated to moderate climate regions, although the potential for GHP systems in hot and humid climates is possible as past research efforts have demonstrated this using simulations and commercial case examples. This research investigates the use of residential GHP systems for the hot and humid climate found in southern Louisiana. The authors collected field performance information, including initial system cost, and electricity consumption and costs from two residential case studies in which each case included one home with a conventional heating and cooling system and one home with a GHP system. Using a comparative analysis and analysis of variance, results illustrate that initial cost of GHP system in the first case was $13,285 more and the second case was $17,588 more than the installation costs of a conventional system. Further, the GHP system payback period depends on the whether the design uses a horizontal or vertical ground loop, and the designer and contractor’s quality and experience in performing the GHP work as the first case resulted in a payback period of 70 years while the second case had a payback period of only seven years. Findings show that when an appropriate installation occurs, GHP system can save consumption and energy costs for residential homes in hot and humid climates.

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“…As can be seen in the summary in Table 1, the overview of the literature on indicators of refurbishment of buildings shows that most studies only consider environmental indicators, where mainly primary energy or global warming potential (GWP) are applied. In relation to the economic evaluation, although there are currently numerous studies that integrate the life-cycle cost (LCC) assessment when evaluating the impact of renewable technologies or energy systems [19][20][21], there are few studies that jointly apply the life-cycle approach to quantify and evaluate the environmental and economic impact of an energy refurbishment of a building. Table 1.…”

Section: Introductionmentioning

confidence: 99%

Environmental and Economic Prioritization of Building Energy Refurbishment Strategies with Life-Cycle Approach

2020

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An increasing number of studies apply life-cycle assessment methodology to assess the impact of a new building or to prioritize between different building refurbishment strategies. Among the different hypotheses to consider during the application of this methodology, the selection of the impact indicator is critical, as this choice will completely change the interpretation of the results. This article proposes applying four indicators that allow analysing the results of a refurbishment project of a residential building with the life-cycle approach: non-renewable primary energy use reduction (NRPER), net energy ratio (NER), internal rate of return (IRR), and life-cycle payback (LC-PB). The combination of environmental and economic indicators when evaluating the results has allowed to prioritize among the different strategies defined for this case study. Furthermore, an extensive sensitivity assessment reflects the high uncertainty of some of the parameters and their high influence on the final results. To this end, new hypotheses related to the following parameters have been considered: reference service life of the building, estimated service life of material, operational energy use, conversion factor, energy price, and inflation rate. The results show that the NRPE use reduction value could vary up to −44%. The variation of the other indicators is also very relevant, reaching variation rates such as 100% in the NER, 450% in the IRR, and 300% in the LC-PB. Finally, the results allow to define the type of input or hypothesis that influences each indicator the most, which is relevant when calibrating the prioritization process for the refurbishment strategy.

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Techno-economic assessment of the horizontal geothermal heat pump systems: A comprehensive review

Cited by 91 publications

References 55 publications

Environmental Performance of Innovative Ground-Source Heat Pumps with PCM Energy Storage

Environmental Performance of Innovative Ground-Source Heat Pumps with PCM Energy Storage

Comparing Geothermal Heat Pump Systems to Conventional HVAC Systems in Hot and Humid Climates

Environmental and Economic Prioritization of Building Energy Refurbishment Strategies with Life-Cycle Approach

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