An overview of the problems and solutions of soil thermal imbalance of ground-coupled heat pumps in cold regions

You, Tingting; Wu, Wei; Shi, Wenxing; Wang, Baolong; Li, Xianting

doi:10.1016/j.apenergy.2016.05.115

Cited by 148 publications

(51 citation statements)

References 72 publications

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“…However, considering the thermal interference between the heat-carrier fluid in the BTES and the undisturbed surrounding ground, the injected heat to the BTES can freely transfer to the surrounding ground [42]. The heat losses from the BTES to the surrounding ground can influence the operation of the BTES in the long term [43]. In this study, to understand the long-term operation of the BTES, the temperature evolutions at the borehole walls are examined over a 50-year period using a 3D numerical simulation model.…”

Section: Long-term Operation Of the Btesmentioning

confidence: 99%

Numerical Investigation of Harvesting Solar Energy and Anti-Icing Road Surfaces Using a Hydronic Heating Pavement and Borehole Thermal Energy Storage

2018

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Hydronic Heating Pavement (HHP) is an environmentally friendly method for anti-icing the roads. The HHP system harvests solar energy during summer, stores it in a Seasonal Thermal Energy Storage (STES) and releases the stored energy for anti-icing the road surface during winter. The aims of this study are to investigate: (i) the feasibility of HHP system with low fluid temperature for harvesting solar energy and anti-icing the road surface; and (ii) the long-term operation of the STES. In this study, a Borehole Thermal Energy Storage (BTES) is considered to be the STES. The HHP system and the BTES are decoupled from each other and their performances are investigated separately. A hybrid 3D numerical simulation model is developed to analyze the operation of the HHP system. Moreover, a 3D numerical simulation model is made to calculate the temperature evolution at the borehole walls of the BTES. The climate data are obtained from Östersund, a city in the middle of Sweden with long and cold winter periods. Considering the HHP system with the inlet fluid temperature of 4 °C, the road area of 50 m × 3.5 m as well as the BTES with 20 boreholes and 200 m depth, the result showed that the harvested solar energy during summer is 352.1 kWh/(m2∙year), the required energy for anti-icing the road surface is 81.2 kWh/(m2∙year) and the average temperature variation at the borehole walls after 50 years is +0.5 °C. Installing the HHP system in the road leads to a 1725 h shorter remaining number of hours of slippery condition on the road surface during winter and a 5.1 °C lower temperature on the road surface during summer, compared to a road without the HHP system.

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Section: Long-term Operation Of the Btesmentioning

confidence: 99%

Numerical Investigation of Harvesting Solar Energy and Anti-Icing Road Surfaces Using a Hydronic Heating Pavement and Borehole Thermal Energy Storage

2018

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“…Annual soil thermal imbalance (Wu et al 2013, Zhu et al 2014, You et al 2016a, heating deficiency at peak heating load (Rad et al 2013, Gehlin andSpitler 2014) and large borehole cost (Garber et al 2013) are three important factors influencing the GCHP performance and hamper its application in heating dominant buildings. To deal with these problems, the hybrid GCHP systems integrated with boiler, solar collector are common in the research and the practical projects.…”

Section: Introductionmentioning

confidence: 99%

Coupled Heating Optimization of Hybrid Gchp System with Heat Compensation Unit

You¹,

Li²,

Wu³

et al. 2017

Proceedings of the IGSHPA Technical/Research Conference and Expo 2017

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“…There are several approaches to address this problem: increasing the GHE size, installing a secondary heating source, and using thermal storage (Wu et al, 2013). You, et al (2016) also suggest several ways to improve GHE performance. Increasing the size of the GHE or changing the layout of boreholes can mitigate thermal imbalance slightly, but is not effective for a larger imbalance.…”

Section: Introductionmentioning

confidence: 99%

“…Increasing the size of the GHE or changing the layout of boreholes can mitigate thermal imbalance slightly, but is not effective for a larger imbalance. Modifying the heat pump system itself to include auxiliary heating sources or using the heat pump only at certain times of the day when other heating options are not available is a practical and effective way to help the heat pump maintain efficiency (You et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Can Ground Source Heat Pumps Perform Well in Alaska?

Garber-Slaght¹,

Peterson²

2017

Proceedings of the IGSHPA Technical/Research Conference and Expo 2017

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The long heating season and cold soils of Alaska provide a harsh testing ground for ground source heat pumps (GSHPs) )office space. The ground heat exchanger was installed in a marginal area underlain with permafrost near 0°C (32°F). The intent of the installation was to observe and monitor the system over a 10-year period in order to develop a better understanding of the performance of GSHPs in

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An overview of the problems and solutions of soil thermal imbalance of ground-coupled heat pumps in cold regions

Cited by 148 publications

References 72 publications

Numerical Investigation of Harvesting Solar Energy and Anti-Icing Road Surfaces Using a Hydronic Heating Pavement and Borehole Thermal Energy Storage

Numerical Investigation of Harvesting Solar Energy and Anti-Icing Road Surfaces Using a Hydronic Heating Pavement and Borehole Thermal Energy Storage

Coupled Heating Optimization of Hybrid Gchp System with Heat Compensation Unit

Can Ground Source Heat Pumps Perform Well in Alaska?

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