Wind-driven device for cooling permafrost

Area of Science:

• Geotechnical Engineering
• Climate Change Mitigation
• Renewable Energy Systems

Background:

• Global warming poses a significant threat to permafrost stability.
• Existing passive cooling methods for permafrost subgrades have shown limited effectiveness.
• Maintaining permafrost integrity is crucial for infrastructure in cold regions.

Purpose of the Study:

• To introduce and evaluate a novel wind-driven device for active permafrost subgrade cooling.
• To assess the device's performance in reducing permafrost temperatures.
• To explore the potential applications of this cooling technology.

Main Methods:

• Development of a wind-driven cooling device incorporating a windmill, a phase change material (PCM) clutch, and a heat exchanger.
• Utilizing the PCM clutch to engage/disengage the cooling system based on ambient air temperature thresholds.
• Conducting two-year observational studies to monitor the device's cooling performance.

Main Results:

• The device successfully cooled an 8.0m high, 1.5m radius permafrost subgrade by 0.6-1.0°C.
• The system operated with an average power consumption of 68.03W.
• The wind-driven mechanism effectively prevented heat transfer into the subgrade during warmer periods.

Conclusions:

• The novel wind-driven device presents an effective method for cooling permafrost subgrades.
• The technology demonstrates potential for adaptation to various infrastructure projects, including embankments and foundations.
• Further research is needed to determine long-term durability and optimal cooling capacity under diverse environmental conditions.