Heat recovery from mineworkings: opportunities in the Glasgow area

Hytiris, Nicholas; Emmanuel, Rohinton; Aaen, Bjorn; Church, Emma Suzanne; Campbell, Diarmad; Ninikas, Konstantinos; Robertson, Andrew

doi:10.1680/envgeo.15.00007

Cited by 7 publications

(6 citation statements)

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“…For example Table 1 shows that the water temperature during the monitoring period was between 12 and 16°C and was never below 12°C, even in the middle of winter. This compares favourably with typical shallow geothermal water temperatures of 9-10°C reported by Hytiris et al (2016) in Glasgow. Therefore, a higher coefficient of performance (COP H ) is likely.…”

Section: Discussionsupporting

confidence: 85%

A heat energy recovery system from tunnel waste water

Hytiris

Ninikas

Emmanuel

et al. 2018

Environmental Geotechnics

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Minimising the maintenance costs of water ingress in transportation tunnels is a significant challenge. Decreasing the overall cost of a ground source heat pump system is equally challenging. An effort to address both issues at once has been made in relation to groundwater ingress in the Glasgow Subway system. Inflowing water is a valuable resource which could be channelled through a water source heat pump (WSHP) to produce heat energy for domestic or public use (heating and domestic hot water). Water flow and water temperature have been recorded for a year at 21 different points within the network of the underground tunnels and platforms. The points of highest water influx were identified, and the heat energy content of each has been calculated. Working from these data, several options were identified for capturing the water and diverting it to a WSHP to recover heat. A final design for a pilot system within the tunnels was developed. The findings of this study are expected to contribute a renewable heat solution through a cost-effective heat pump system design. Notation COP H coefficient of performance E required energy: kW G heat energy flux: kW H total heating effect S VC specific heat capacity of water: J/(l K) Z flow rate: l/s Dq temperature drop:°C r density of water: kg/m 3 300 Cite this article

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Section: Discussionsupporting

confidence: 85%

A heat energy recovery system from tunnel waste water

Hytiris

Ninikas

Emmanuel

et al. 2018

Environmental Geotechnics

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“…Many other authors highlight mines with the potential to house similar projects, as described by Rodríguez and Díaz (2009), Hytiris et al (2014), Morkun et al (2015), and Ghomshei (2007).…”

Section: Projects Of Heat Recovery After the Mine Is Closedmentioning

confidence: 94%

Numerical Model to Assess the State and Increase of Temperatures in Underground Mine Galleries: A Tool to Support Heat Recovery Projects

Colombo

Dinis

Carvalho

2021

ijthfa

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Underground mining is facing growing challenges related to the need to mine deeper and at higher temperatures, to operational expenditures associated with energy consumption, lower grade ores, environmental constraints, and social pressures. In this scenario, a new numerical model is proposed to estimate temperature increase inside mining galleries to provide specific criteria for heat recovery projects, which may consider heat extraction from abandoned mines using closed-loop geothermal systems or from operating mines using the exhaust ventilation air. This model couples different approaches from previous models and include key parameters unemployed until this moment, such as wall roughness and velocity profile modeling, what would allow for a more realistic estimation of convective heat transfer phenomena, which is critical to predicting heat exchange in ventilation air due to the turbulent nature of the airflow. The model also includes other heat sources that could be present inside galleries and should be accounted for, such as machinery, once the heat dissipated to the environment might be substantial depending on the equipment and gallery geometry. The general intention of this project is to account for every heat source that may contribute to increasing the temperature inside the gallery, so it becomes tangible to harness as much heat energy as possible, preventing energetic losses and stimulating an increase of thermodynamic efficiency in underground mining operations. The model is not validated yet with real temperature data, but preliminary results agree with the ones from previous models.

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“…The project therefore worked towards establishing two trial sites in Subway stations -one with a water source heat recovery system (water source heat pump -WSHP) and one with an air source heat recovery system (air source heat pump -ASHP) [5,6]. The sites selected were St Georges Cross station for the water system and Bridge Street station for the air system.…”

Section: Pilot Studymentioning

confidence: 99%

Review of Sustainable Heat in the Glasgow Subway Tunnels

Hytiris

2020

CERJ

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Heat recovery from mineworkings: opportunities in the Glasgow area

Cited by 7 publications

References 1 publication

A heat energy recovery system from tunnel waste water

A heat energy recovery system from tunnel waste water

Numerical Model to Assess the State and Increase of Temperatures in Underground Mine Galleries: A Tool to Support Heat Recovery Projects

Review of Sustainable Heat in the Glasgow Subway Tunnels

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