Abstract
Deep mining results in an increasingly serious hazard. Based on the principle of heat transfer and radiant cooling, a three-dimensional heat transfer model of the working face was established. The influence of the inlet airflow parameter, the surrounding wall temperature and other parameters on the temperature distribution of airflow along the working face were analyzed under the radiation cooling mode. The results show that the increment of airflow temperature in several sections along the working face decreases by 0.67 °C, 0.48 °C, 0.40 °C, 0.36 °C, 0.33 °C, 0.29 °C respectively. The farther away from the airflow inlet, the more obvious the cooling effect was. The airflow temperature of the working face is positively correlated with the airflow inlet temperature and the surrounding wall temperature, and is negatively correlated with the airflow velocity. The research provides a good solution for the working face cooling of deep mines, and also provides a theoretical reference for the research on the radiation cooling technology of the working face.
Highlights
With the rapid development of the national economy and the increasing demand for mineral resources, deep mining has become an inevitable development trend in the mining industry, and the heat damage caused by geothermal energy is becoming increasingly serious
Krajčík et al [20], Cheng et al [21], Li et al [22] and Yang et al [23] combined displacement ventilation with floor radiation cooling or ceiling radiation cooling, and studied the influences of air supply parameters, water supply parameters and the installation locations of radiation cooling surfaces on the indoor thermal environment; the results showed that the mixed system could effectively improve the indoor thermal comfort, and the thermal comfort and ventilation effect are better in the region closer to the heat source
Based on the backfill mining method [25,26], this research uses a combination of radiation cooling and ventilation to reduce the airflow temperature of the working face
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Krajčík et al [20], Cheng et al [21], Li et al [22] and Yang et al [23] combined displacement ventilation with floor radiation cooling or ceiling radiation cooling, and studied the influences of air supply parameters, water supply parameters and the installation locations of radiation cooling surfaces on the indoor thermal environment; the results showed that the mixed system could effectively improve the indoor thermal comfort, and the thermal comfort and ventilation effect are better in the region closer to the heat source. Based on the backfill mining method [25,26], this research uses a combination of radiation cooling and ventilation to reduce the airflow temperature of the working face. The study is of great significance to alleviate the heat damage in deep mines and improve the design of ventilation systems, but can realize the geothermal exploitation and improve the utilization rate of mineral resources and geothermal resources
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