Conduction-corrected modified effective temperature as the indices of combined and separate effect of environmental factors on sensational temperature

Kurazumi, Yoshihito; Tsuchikawa, Tadahiro; Kondo, Emi; Horikoshi, Tetsumi; Matsubara, Naoki

doi:10.1016/j.enbuild.2009.10.012

Cited by 16 publications

(36 citation statements)

References 11 publications

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“…Because perspiration was difficult to ascertain, we used the thermoregulation model of Kurazumi et al [19] to arrive at these values. We then calculated ETF as theorized and validated by Kurazumi et al [20,21] based on thermal environment measures as well as skin temperature and amount of clothing.…”

Section: Observed Results On Thermal Environmentsmentioning

confidence: 99%

Effects of Visual Stimuli upon Thermal Sense under Air Conditioning in Summer

K¹

2014

J Ergonomics

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Human thermal sense is not expressed only by simple heat equilibrium. The influence of visual and auditory stimuli causes differences in overall thermal sense arrived at by sophisticated sensory processing by the cerebrum. If it can be clearly shown that a thermal environment considered slightly uncomfortable could be ameliorated using visual stimuli, the cost effectiveness of such an initiative would be highly significant, particularly in terms of air conditioning system running costs. Focusing on the visual stimuli provided by greenery, experiments were conducted in a thermal environment deemed slightly uncomfortable, where the temperature was set at a base point of 28ºC. Experiments were conducted in a temperature-controlled room. Thermal environmental conditions were set at three different temperatures: 25ºC, 28ºC and 31ºC. Wall surface temperatures were set to equal these temperatures. Air velocity (calm air currents of 0.2 m/s or less) and relative humidity (60% RH) were set the same throughout. Subjects were asked to sit quietly for the test. The visual stimuli consisted of ten different types of scenery, including that of leafy vegetation. The influence of overall stimuli of the cerebrum on the indoor thermal environmental index ETF was determined to prove the significance of actively placing visual stimuli in spaces. Thermal stimuli influence the human body on mean skin temperatures, while visual stimuli do not affect mean skin temperatures. In ETF deemed fairly uncomfortable, that is at a range of hotter than 28-29ºC, clear improvements were observed in thermal sense due to the influence of visual stimuli such as natural elements including vegetation like greenery. Visual stimuli were appropriate at a level of up to 69% greenery, where a dynamic effect on warmer environmental conditions can be felt and where the depth of fuller vegetation cover can be perceived.

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Section: Observed Results On Thermal Environmentsmentioning

confidence: 99%

Effects of Visual Stimuli upon Thermal Sense under Air Conditioning in Summer

K¹

2014

J Ergonomics

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“…Although Kurazumi et al [6,7] derived ETF and ETFe using the heat loss in Eq. (53), the present paper adopts Eq.…”

Section: Consideration Of Heat Conductionmentioning

confidence: 99%

“…Kurazumi et al [6] This paper refers to this quantity as the standard effective conduction field (SECF).…”

Section: Consideration Of Heat Conductionmentioning

confidence: 99%

“…These separations indicate how much each environmental factor affects the universal effect; therefore, it is helpful to understand which factors should be improved to make us feel thermally comfortable. Since then, new indices indicating both universal and separate effects, e.g., ETVO [5], ETF [6], and ETFe [7], have been proposed. ETVO is applicable to the outdoors with solar radiation, not to non-uniform conditions or situations involving sitting or lying on something with heat conduction.…”

Section: Introductionmentioning

confidence: 99%

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New index indicating the universal and separate effects on human comfort under outdoor and non-uniform thermal conditions

Nagano

Horikoshi

2011

Energy and Buildings

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“…Focusing on this point, Kurazumi et al [6] developed the Conduction-corrected modified effective temperature (ETF), which includes heat conduction, in order to be able to evaluate the thermal environment in the living space in which behavioral thermoregulation changes with posture. This sensational and physiological temperature index ETF can take into account the effect of factors such as: air velocity, long-wave radiation, heat conduction, and humidity.…”

Section: Introductionmentioning

confidence: 99%

Behavioral Thermoregulation Model for Evaluation of Outdoor Thermal Environment

Kurazumi¹,

Sakoi²

2014

J Ergonomics

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In the outdoor environment, the effect of the physical environmental factors that compose the sensational and physiological temperature is remarkably large in comparison to the indoor environment. The purpose of this paper is to propose and develop a behavioral thermoregulation model in the outdoor environment, in order to predict the mean skin temperature for the evaluation of outdoor environment. This model is based on a Two-Node Model, and has three components: direct solar radiation, indirect solar radiation, and heat conduction. Each body part consists of core and skin layers. The model formula, by ratio of body weight of skin layer of heat conductance between skin and core layer, was included in this model. To verify this model, experiments were conducted. It was shown from the relation between ETFe (Enhanced conduction-corrected modified effective temperature) and mean skin temperature that it is possible to quantity explicitly the effects owing to outdoor environmental factors, short-wave solar radiation, heat conduction etc. It was made clear that the current model is valid for simulated mean skin temperature in the outdoor environment.

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Conduction-corrected modified effective temperature as the indices of combined and separate effect of environmental factors on sensational temperature

Cited by 16 publications

References 11 publications

Effects of Visual Stimuli upon Thermal Sense under Air Conditioning in Summer

Effects of Visual Stimuli upon Thermal Sense under Air Conditioning in Summer

New index indicating the universal and separate effects on human comfort under outdoor and non-uniform thermal conditions

Behavioral Thermoregulation Model for Evaluation of Outdoor Thermal Environment

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