Heat flux measurements from a human forearm under natural convection and isothermal jets

Shenoy, Shyam Krishna; Diller, Thomas E.

doi:10.1016/j.ijheatmasstransfer.2018.02.068

Cited by 8 publications

(5 citation statements)

References 31 publications

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“…Although the present study does not aim to clarify such a detailed spatial characteristic, but rather a coarse trend on the vehicle roof, the basis of the measurement methodology is the same. Similar methods using thin-film heat flux sensors have also been applied to measure the convective heat flux from parts of the human body [30][31][32]. It is noteworthy that this experiment was performed without the VIPV module to estimate h on the smooth surface of a real car because the actual VIPV module is generally integrated into the car roof without any roughness so that it does not create resistance to airflow.…”

Section: Methodsmentioning

confidence: 99%

Measurement of the Convective Heat Transfer Coefficient and Temperature of Vehicle-Integrated Photovoltaic Modules

2022

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To improve the thermal design of vehicle-integrated photovoltaic (VIPV) modules, this study clarifies the characteristics of the convective heat transfer coefficient h between the vehicle roof surface and the surrounding air with respect to vehicle speed. Experiments on two types of vehicles with different body shapes indicate that h is strongly affected by vehicle speed, and it is also affected by body shape depending on the position on the roof. Empirical equations for approximating h as a function of vehicle speed and position on the vehicle roof are derived from the experimental datasets, and the differences between the equations derived herein and traditional equations that have been used for the heat transfer analysis of conventional stationary photovoltaic (PV) modules are clarified. Furthermore, the temperature change characteristics of the VIPV module were measured experimentally, confirming that h is the dominant factor causing the high temperature change rate of the VIPV module under driving conditions. In sunny summer conditions, the measured temperature change rate reaches up to 16.5 °C/min, which is approximately 10 times greater than that in the standard temperature cycle test for conventional stationary PV modules.

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Section: Methodsmentioning

confidence: 99%

Measurement of the Convective Heat Transfer Coefficient and Temperature of Vehicle-Integrated Photovoltaic Modules

2022

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“…The first step was used for noise reduction of the signal. The heat flux data include a high degree of noise due to the natural air movement in the room [54]. Benefiting from its strength in maintaining the shape and the height of the raw signal waveforms, the Savitzky-Golay filtering method was used in this study [55].…”

Section: Methodsmentioning

confidence: 99%

Heat Flux Sensing for Machine-Learning-Based Personal Thermal Comfort Modeling

Jung

Jazizadeh

Diller

2019

Sensors

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In recent years, physiological features have gained more attention in developing models of personal thermal comfort for improved and accurate adaptive operation of Human-In-The-Loop (HITL) Heating, Ventilation, and Air-Conditioning (HVAC) systems. Pursuing the identification of effective physiological sensing systems for enhancing flexibility of human-centered and distributed control, using machine learning algorithms, we have investigated how heat flux sensing could improve personal thermal comfort inference under transient ambient conditions. We have explored the variations of heat exchange rates of facial and wrist skin. These areas are often exposed in indoor environments and contribute to the thermoregulation mechanism through skin heat exchange, which we have coupled with variations of skin and ambient temperatures for inference of personal thermal preferences. Adopting an experimental and data analysis methodology, we have evaluated the modeling of personal thermal preference of 18 human subjects for well-known classifiers using different scenarios of learning. The experimental measurements have revealed the differences in personal thermal preferences and how they are reflected in physiological variables. Further, we have shown that heat exchange rates have high potential in improving the performance of personal inference models even compared to the use of skin temperature.

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“…As consequence, the reference is not properly defined. For this reason, in many works, more importance is given to relative values [32,13,33,34] than to absolute values, taking the initial state of heat power as a reference. On the other hand, few authors consider transient states in the measurement of heat flow [14].…”

Section: Relationship Between the Signal Provided By The Thermopile A...mentioning

confidence: 99%

“…accurate balance of the energy transferred by the human body during the transient state, it is necessary to consider the heat capacities of the bodies involved in the heat transfer phenomenon. An alternative way to obtain an accurate balance consists of using instruments that have a very low thermal inertia [34]. In previous works we have shown the interest of performing measurements while varying the temperature of the sensor thermostat, and studying the corresponding transient states [29,23].…”

Section: Relationship Between the Signal Provided By The Thermopile A...mentioning

confidence: 99%

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Heat Flow Measurement of Human Skin Using a Calorimetric Sensor with a Programmable Thermostat. An Alternative to Climate Chambers

Rivera¹,

Socorro²,

Rivera³

2022

SSRN Journal

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Heat flux measurements from a human forearm under natural convection and isothermal jets

Cited by 8 publications

References 31 publications

Measurement of the Convective Heat Transfer Coefficient and Temperature of Vehicle-Integrated Photovoltaic Modules

Measurement of the Convective Heat Transfer Coefficient and Temperature of Vehicle-Integrated Photovoltaic Modules

Heat Flux Sensing for Machine-Learning-Based Personal Thermal Comfort Modeling

Heat Flow Measurement of Human Skin Using a Calorimetric Sensor with a Programmable Thermostat. An Alternative to Climate Chambers

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