Abstract
A steady and proper thermal environment in deep underground is imperative to ensure worker health and production safety. Understanding the thermal performance in the roadway is the premise of temperature prediction; ventilation design; and improvement in cooling efficiency. A full coupled model incorporated with a moving mesh method was adopted; reflecting the dynamic condition of roadway construction. This study revealed the characteristics of the thermal performance and its evolution law in an excavating roadway. Several scenarios were performed to examine the designs of the auxiliary ventilation system on thermal performance in the roadway. The results show that there is a limitation in the cooling effect by continuously increasing the ventilation volume. Reducing the diameter of the air duct or distances between the duct outlet and the working face will aggravate the heat hazard in the roadway. The heat release from the roadway wall increases with the increase of the advance rate of the working face or roadway section size. Furthermore; an orthogonal experiment was conducted to investigate the effect of major factors on the average air temperature and local heat accumulation in the roadway
Highlights
A steady and proper thermal environment in deep underground is imperative to ensure worker health and production safety
The cold fresh air is released from the air duct to the roadway, and most characteristic airflow theand development zone of the of itThe impinges on the workingof face and thenin turns flows to the roadway outlet
The cold fresh air is released from the air duct to the ro of it impinges on the working face and turns and flows to the road the working face, the airflow velocity on the two sides of the walls is larg fields can be distinguished in the roadway: Jet zone, Backflow zone, and
Summary
With the increase in decreasing of shallow resources, deeper resource exploitation in high-temperature circumstances has become a necessity [1,2]. Public Health 2021, 18, 1184 conditions have a significant relationship with dust movement, the extensive studies have been carried out to examine the diffusion rules of dust and the optimal dust-removal airflow rate [16,17,18] These subjects have been widely studied, but there are few studies focused on the problem of heat hazard control by auxiliary ventilation in the mine roadway, and the auxiliary ventilation plays an important role in regulating air temperature [19]. Maintaining a steady and comfortable thermal environment in underground spaces has received more attention in recent years due to the more severe heat hazard situation Various cooling systems such as split-type vapor compression refrigerators [27], high temperature exchange machinery system (HEMS) [28,29], liquid carbon dioxide cycle refrigeration systems [30] et al have been proposed for removing heat and improving working conditions. This study can provide a robust theoretical basis for saving cooling energy in heat hazard control and improving the thermal comfort in roadway construction
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