Sensibility Studies on a Transient Thermal Model of the Human Body

Teixeira, Senhorinha; Falcão, Eduardo H.L.; Rodrigues, Nelson; Teixeira, José Carlos

doi:10.1109/iccsa.2014.40

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…Assuming that in the present study, a surgeon was simulated dressed, with only the head and the hands not covered, a system of 94 differential equations is solved, including 24 equations to calculate the water vapor density variation along the time, in the cloth layers. Full details of the model can be found elsewhere [12].…”

Section: Ihtc15-9593mentioning

confidence: 99%

Modeling the Thermal Environment in an Operating Room

Teixeira

Rodrigues

Miguel

et al. 2014

Proceedings of the 15th International Heat Transfer Conference

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Comfort is important in everybody's lives, as it is not only a health subject, but also a productive issue. As environmental conditions differ accordingly to the space use, there is a direct influence of this space on human comfort. The Heating Ventilation and Air Conditioning (HVAC) Systems are a crucial way to obtain the expected air quality levels in the interior of buildings and to achieve thermal comfort. These systems ensure air renewal, pressurization, temperature control, and air humidity, being of utmost importance in healthcare facilities. Providing thermal comfort conditions and good air quality, especially in operating rooms, is a difficult task, as the environmental conditions should be suitable for medical staff performance and for patient safety, as well. In the current study, a Computational Fluid Dynamics model was developed and coupled with a thermoregulatory model of the human body to describe the fluid flow, heat transfer and mass transfer between the ventilation air and a human manikin inside an operating room. The CFD simulation solves the heat, mass and momentum conservation equations in the computation domain using a finite volume discretization method, in the ANSYS © environment. The interaction between the body and the environment is determined by the thermoregulatory model, which includes temperature and the moisture diffusion through the cloth fabrics. The combination of the human body and space ventilation models allows evaluating the influence of the main thermal comfort variables on the calculation of comfort index, such as, the PMV.

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Section: Ihtc15-9593mentioning

confidence: 99%

Modeling the Thermal Environment in an Operating Room

Teixeira

Rodrigues

Miguel

et al. 2014

Proceedings of the 15th International Heat Transfer Conference

View full text Add to dashboard Cite

show abstract

“…Sevilgen and Kilic [21] used CFD techniques to study thermal comfort and water transfer in a room with two heating radiators. Teixeira et al [22] coupled CFD code with a multi-node thermoregulatory model to determine body skin temperature via two methods: constant temperature and different temperature measurements in different local parts. Angelova et al [23] analyzed the thermal physiological comfort of operating room patients and surgeons and simulated a surgical clothing combination with three clothing insulation values.…”

Section: Introductionmentioning

confidence: 99%

Research on the Heating Effect of a Convection Radiator Based on a Human Thermophysiological Model

Liu,

Xu,

Zhang

et al. 2024

Buildings

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Forced convection is the most effective way to improve the thermal efficiency of a radiator under low-temperature conditions. This technical method differs significantly from the heating effects of general radiation and natural convection. Few studies have applied the objective evaluation method based on quantitative calculation to evaluate the effectiveness of indoor heating or optimize the technical parameters (air flow rate, air supply method, etc.) of heating systems. This article couples human metabolic factors with heating environmental factors and uses a 57-node human thermal physiological model to evaluate the effectiveness of forced convection radiator heating from the perspective of the local thermal comfort of the human body and demonstrates the feasibility of this scheme by comparing it with floor radiation heating. The research shows that the air supply speed of a radiator affects human thermal comfort. Continuing to increase the wind speed, at a speed of 3 m/s, the surface temperature of the human body reaches a high value and will then decrease, leading to a decrease in thermal comfort. Research on indoor air distribution shows that the use of bottom-side air supply provides better thermal comfort compared to top air supply. The local skin temperature distribution of the human body indicates that when the indoor average temperature is higher than 20 °C, the overall thermal comfort of convective radiator heating and floor radiant heating is comparable. The article provides a way of objectively calculating and directly quantifying the effect of heating equipment on human thermal physiological parameters.

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Research on Heating Effect of Convection Radiator Based on Human Thermophysiological Model

Liu,

Xu,

Zhang

et al. 2023

Preprint

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This article couples human metabolic factors and heating environmental factors, and uses a 57 node human thermal physiological model to study the heating effect of radiators. It provides a way to objectively calculate and directly quantify the effect of heating equipment on human thermal physiological parameters. As the inlet speed increases, the surface temperature of the human body first increases and then decreases. At a speed of 3m/s, it basically reaches a high value. Continuing to increase the wind speed, as the indoor convection intensity further increases, the surface temperature of the human body will decrease, leading to a decrease in thermal comfort. Compared with floor radiation heating under similar indoor temperature conditions, forced convection radiator heating has similar skin temperatures in various parts of the human body after the indoor design temperature exceeds 20 ℃, and the overall thermal comfort of the two technical solutions is equivalent. Research has shown that the turbulence wind speed of convective radiators should not be too small, with a wind speed range of 2.5m/s to 3m/s. The heating effect of using horizontal air outlet from the lower part of the radiator is better than that of vertical air outlet from the upper part. Convection type radiator heating is more suitable for buildings with rooms that are not too high due to the large indoor temperature gradient.

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Sensibility Studies on a Transient Thermal Model of the Human Body

Cited by 3 publications

References 20 publications

Modeling the Thermal Environment in an Operating Room

Modeling the Thermal Environment in an Operating Room

Research on the Heating Effect of a Convection Radiator Based on a Human Thermophysiological Model

Research on Heating Effect of Convection Radiator Based on Human Thermophysiological Model

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