Study on open-cycle carbon dioxide refrigerator for movable mine refuge chamber

Yang, Junling; Yang, Le; Wei, Juan; Ma, Yuezheng; Zhang, Zhentao

doi:10.1016/j.applthermaleng.2012.12.014

Cited by 25 publications

(3 citation statements)

References 12 publications

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“…The questionnaires used to obtain subjective ratings included thermal responses, self-rated mental effort, and acute health symptoms. After each test, a bipolar scale used by Lan et al 21,55 was applied to assess self-rated mental effort, ranging from very low (0) to very high (7). Thermal comfort votes (TCV) and thermal sensation votes (TSV) were cast on a five-point continuous scale and ASHRAE/ISO seven-point thermal sensation scale, respectively.…”

Section: Subjective Measurementsmentioning

confidence: 99%

“…For example, CO 2 concentrations in underground coal mine refuges can reach as high as 25 000 ppm 4 or even 30 000 ppm. 5 It should also be noted that these spaces could become hot and humid when in use, [6][7][8] and occupants do not have access to daylight or views, owing to poor lighting conditions. In addition, changes in the light, heat, and CO 2 concentrations of underground confined spaces can cause psychological fluctuations that induce nervousness, depression, and restlessness.…”

Section: Introductionmentioning

confidence: 99%

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Human responses to high levels of carbon dioxide and air temperature

Song

et al. 2020

Indoor Air

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In this study, 30 subjects were exposed to different combinations of air temperature (T a : 24, 27, and 30°C) and CO 2 level (8000, 10 000, and 12 000 ppm) in a high-humidity (RH: 85%) underground climate chamber. Subjective assessments, physiological responses, and cognitive performance were investigated. The results showed that as compared with exposure to T a = 24°C, exposure to 30°C at all CO 2 levels caused subjects to feel uncomfortably warm and experience stronger odor intensity, while increased mental effort and greater intensity of acute health symptoms were reported.However, no significant effects of T a on task performance or physiological responses were found. This indicated that subjects had to exert more effort to maintain their performance in an uncomfortably warm environment. Increasing CO 2 from 8000 to 12 000 ppm at all T a caused subjects to report higher rates of headache, fatigue, agitation, and feeling depressed, although the results were statistically significant only at 24 and 27°C. The text typing performance and systolic blood pressure (SBP) decreased significantly at this exposure, whereas diastolic blood pressure (DBP) and thermal discomfort increased significantly. These effects suggest higher arousal/ stress. No significant interaction effect of T a and CO 2 concentration on human responses was identified.

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Section: Subjective Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Human responses to high levels of carbon dioxide and air temperature

Song

et al. 2020

Indoor Air

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“…Then it flows into evaporator for evaporative refrigeration, and it released into environment ultimately. According to these two working processes, open refrigeration systems without external electricity unit are suitable for the cases of limited electrical power supply such as movable mine refuge chambers [2], food vehicles [3] and some disposable refrigeration systems. As the refrigerant flows out from the throttle device is two-phase fluid, the temperature of the refrigerant in the evaporator only depends on the pressure.…”

Section: Introductionmentioning

confidence: 99%

Modeling and calculation of open carbon dioxide refrigeration system

Cai

Zhu

Jiang

et al. 2015

Energy Conversion and Management

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Optimization of environmental maintenance system used in a refuge chamber

Yang

Zhang

et al. 2015

Int J Coal Sci Technol

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Mine refuge chambers are used to shield miners who fail to escape from the mine when incidents occur. Environment maintaining system plays a key role in stabilizing thermal environment of a mine refuge chamber against heat emitted from metabolism and transferred from outside. The safety and comfort of refugees are closely related to the environment maintaining system design. In order to improve the comfort of refugees, optimization on the environment maintaining system has been done based on the previous work. To evaluate the environment of the chamber, eight volunteers were involved into the experiment. Under close observation and safety protection, they lived in a heat-isolated test chamber for 106 hours. The volunteers were asked to maintain low level of activities to simulate refugees' situation. It shows that the environment maintaining system worked well and the temperature, relative humidity and emitted harmful air content such as CO 2 and CO were all kept in the safety level, and no discomfort was felt by volunteers at all.

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Study on open-cycle carbon dioxide refrigerator for movable mine refuge chamber

Cited by 25 publications

References 12 publications

Human responses to high levels of carbon dioxide and air temperature

Human responses to high levels of carbon dioxide and air temperature

Modeling and calculation of open carbon dioxide refrigeration system

Optimization of environmental maintenance system used in a refuge chamber

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