An Evaluation of the Functioning of Cooling Systems in the Polish Coal Mine Industry

Szlązak, N.; Obracaj, D.; Swolkień, Justyna

doi:10.3390/en11092267

Cited by 10 publications

(5 citation statements)

References 12 publications

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“…As the configuration of underground mine workings are constantly changing the need to evacuate heat can occur locally, as a result, possibility of using spot cooling systems in order to evacuate heat are analysed further. A great variety of cooling systems are presented above [2][3][4][5][6][7] but the schematics of all can be resumed as in Fig. 1.…”

Section: Design Of An Appropriate Cooling System For Mines Located In the Jiu Valleymentioning

confidence: 99%

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Influence of ambient temperature on the efficiency of underground spot cooling system

et al. 2022

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In mine air conditioning systems, the vapour compression refrigeration cycle seems to be currently the most widespread method of artificial cooling. In literature some other methods for cooling a mine are also presented, like using free-cooling in refrigeration systems. Mine workings in Jiu Valley are using the primary and secondary ventilation system for cooling the underground. Today the activities are focused mainly on mine closure as a part of transition to the low carbon economy, and this situation brings new challenges regarding the mine ventilation system, which was designed to meet the needs of a full-scale operation. As a result, locally ambient temperatures can rise, and spot cooling systems can be used, in order to cool the air. Such a system has been considered and calculations have been made to evaluate its thermal efficiency at different ambient temperatures.

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Section: Design Of An Appropriate Cooling System For Mines Located In the Jiu Valleymentioning

confidence: 99%

“…In most countries, mine legislation requires a certain underground working temperature. Poor microclimatic conditions affect miners, causing a reduction of perception, concentration, attention, and perceptiveness [3]. Mine cooling systems therefore forms an integral part of ensuring safe underground working conditions.…”

Section: Introductionmentioning

confidence: 99%

Influence of ambient temperature on the efficiency of underground spot cooling system

et al. 2022

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“…Authors describe the methodology applied in the study in paper Szlązak et al, 2018b(Szlązak, Obracaj, Swolkień, 2018b.…”

Section: Fig 3 Diagram Of the Air-conditioning Systemmentioning

confidence: 99%

Functioning Efficiency of the Central Air-Conditioning System on the Selected Example

Szlązak

Swolkień

2020

New Trends in Production Engineering

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One of the particularly significant threats during exploitation is the climatic threat, which is associated with an increase in the overall costs that are allocated to combating it. The rise in the virgin temperature of the rock mass by 1oC increases the demand for the required cooling capacity to be taken from the air. The publication assesses the effectiveness of the air-conditioning installation by testing its operation on a selected example. The assessment of the efficiency of the air-conditioning installation for a selected hard coal mine showed that none of the five tested coolers achieved the maximum assumed rated power. The use of total power (7.5 MW) in mining excavations was less than 50% and amounted to η = 0.472%. The research showed that the main reason for obtaining low cooling parameters is the inability to locate them in the place of the highest air temperatures. The other problem is an insufficient airflow rate of cooling water supplied to the coolers at too high temperature. The above considerations indicated that the cooling power from built-in air- conditioning systems is not properly and effectively used. Improving the efficiency of its functioning is possible by proceeding research that will eliminate the above factors and by using air conditioning equipment, taking into account the periodic audit of their work to reduce electricity consumption.

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“…Wang et al [15] established a local cooling system based on a water source heat pump; solved the problems of water supply, heat removal, and the cooling of the local cooling system; reduced the investment and operating costs; and improved the refrigeration efficiency. Nikodem et al [16] investigated the actual air cooling efficiency through research on air cooling devices of six hard coal mines, and the results obtained allowed a more accurate identification of the factors that reduced the efficiency of the cooling system of the mining plant under analysis. Although the current literature is relatively comprehensive, there is still a lack of detailed discussion on the factors affecting the cooling effect of cooling systems.…”

Section: Introductionmentioning

confidence: 99%

Influencing Factors of a Cooling System Based on Low-Temperature Mine Water as a Direct Cooling Source

Jiang¹,

Cui²,

Mu³

et al. 2022

Energies

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With the depletion of shallow metal mineral resources, deep mining has become more common. In the process of deep mining, heat hazards in mines seriously threaten the health of personnel and the safety of mining operations. According to the flow and low-temperature characteristics of abundant water in Maoping Lead Zinc Mine, this paper proposes the direct use of the low-temperature water inflow of the mine as the cold source by which to conduct the heat exchange with a single spiral-tube heat exchanger for mine cooling. An experimental platform was built for the cooling system to allow us to explore the mechanism of the influence of the inlet air volume and air temperature and the inlet water temperature and flow on the cooling effect of the single spiral-tube heat exchanger. It was found that with the increase in the inlet air volume and inlet water temperature, the cooling efficiency of the heat exchanger decreased, while with the increase in the inlet air temperature, the cooling efficiency of the heat exchanger increased. Within the experimental range, 127.2 m3/h was found to be the optimum inlet air volume, and 33.0 °C was the most appropriate inlet air temperature; the water temperature of Maoping Coal Mine is about 20 °C throughout the year, and the industrial test site can reduce the wind temperature of 31.5 °C to 23.9 °C. The inlet water flow is positively related to the cooling effect. With the increase in the water flow, the outlet temperature of the air flow at each working point was continuously reduced, and the cooling effect of the heat exchanger was improved. The moisture content of the inlet air flow can be reduced by increasing the low-temperature inlet water flow. Through experiments, the feasibility of the cooling system that directly uses the mine’s low-temperature water as the cold source was verified. A multiple linear regression analysis equation for the cooling system model is proposed, which provides a reference for formulating effective measures to prevent and control heat hazards in mines.

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An Evaluation of the Functioning of Cooling Systems in the Polish Coal Mine Industry

Cited by 10 publications

References 12 publications

Influence of ambient temperature on the efficiency of underground spot cooling system

Influence of ambient temperature on the efficiency of underground spot cooling system

Functioning Efficiency of the Central Air-Conditioning System on the Selected Example

Influencing Factors of a Cooling System Based on Low-Temperature Mine Water as a Direct Cooling Source

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