Liu, Shuai, Wenqi Li, Fan Xu, Hao Wang, Meiyuan Yang, and Zhenying Zhang. “A Study on a Multifunctional Variable-Condition Heat Pump System for Mitigating Heat Stress in Deep Coal Mines and Utilizing Waste Heat”. International Journal of Energy 9, no. 2 (April 30, 2026): 28–35. Accessed May 7, 2026. https://drpress.org/ojs/index.php/ije/article/view/34849.