Effects of heated seats in vehicles on thermal comfort during the initial warm-up period

Oi, Hajime; Tabata, Koji; Naka, Yasuhito; Takeda, Akira; Tochihara, Yutaka

doi:10.1016/j.apergo.2011.05.013

Cited by 39 publications

(32 citation statements)

References 15 publications

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“…This means that there was large diversity in the comfort perception, from very uncomfortable to comfortable. Such findings were stated also in other papers [4,9,10].…”

Section: Resultssupporting

confidence: 66%

“…Comfortable skin temperature on the heated seat is approximately 34 °C [9]. In this experiment, the comfort was scarified by higher skin temperatures to reveal a comfort vote development under warmer conditions.…”

Section: Resultsmentioning

confidence: 99%

“…A heated seat should ensure quick heat up in cold conditions to desired surface temperature. Oi et al [9] recommend temperatures on the heated seat of around 34 °C depending on the ambient conditions. On the other hand, long exposures to temperatures above 43 °C may cause skin burns.…”

Section: Introductionmentioning

confidence: 99%

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Impact of measurable physical phenomena on contact thermal comfort

et al. 2017

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Abstract. Cabin HVAC (Heating Ventilation and Air-conditioning) systems have become an essential part of personal vehicles as demands for comfortable transport are still rising. In fact, 85 % of the car trips in Europe are shorter than 18 km and last only up to 30 minutes. Under such conditions, the HVAC unit cannot often ensure desired cabin environment and passengers are prone to experience thermal stress. For this reason, additional comfort systems, such as heated or ventilated seats, are available on the market. However, there is no straightforward method to evaluate thermal comfort at the contact surfaces nowadays. The aim of this work is to summarise information about heated and ventilated seats. These technologies use electrical heating and fan driven air to contact area in order to achieve enhanced comfort. It is also expected, that such measures may contribute to lower energy consumption. Yet, in real conditions it is almost impossible to measure the airflow through the ventilated seat directly. Therefore, there is a need for an approach that would correlate measurable physical phenomena with thermal comfort. For this reason, a method that exploits a measurement of temperatures and humidity at the contact area is proposed. Preliminary results that correlate comfort with measurable physical phenomena are demonstrated.

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“…This means that there was large diversity in the comfort perception, from very uncomfortable to comfortable. Such findings were stated also in other papers [4,9,10].…”

Section: Resultssupporting

confidence: 66%

Section: Resultsmentioning

confidence: 99%

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Impact of measurable physical phenomena on contact thermal comfort

et al. 2017

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“…Therefore, the PPOSB is one of design features for the car seats of a passenger car. Many studies have been conducted on car seats from the perspective of ergonomics engineering [13,6,11,3]. The transmission of vertical vibration through seats is has been researched [13].…”

Section: Introductionmentioning

confidence: 99%

Development of an index for the sound and haptic quality of a seat belt

et al. 2015

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“…Recently, car producers put an increased emphasis on the heat, moisture and air transportation properties of their car seat covers to ensure good physiological comfort for drivers. In order to understand the process, the e ect of a heated seat on thermal comfort during the initial warm-up period, an ergonomic evaluation of thermal comfort inside a car, the measurement of sweating and other factors have been investigated [2,4,5]. Moisture management behaviour, thermal properties and air transport of 3D warp knitted spacer fabric (3D spacer) and polyurethane foam (PU foam), which are commonly used as padding in car seat covers, have been examined [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

The Study of Fabric Performance for Car Seats

Havelka¹,

Glombikova²,

Komarkova³

et al. 2017

TEK

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This paper deals with the investigation of the performance of car seat fabrics in terms of physiological comfort of sitting, specifi cally their water vapour resistance and air permeability. The current work presents an alternative approach to increasing the eff ectiveness of car seat fabrics through a combination of newly designed middle layer with forced convection achieved by a supplementary suction ventilation device. The supplementary device was designed to measure water vapour permeability by means of the sweating guarded hot plate (SGHP) system. It consists of two parts: a frame to grip a tested sample for measurements within the SGHP system and two suction ventilators which are arranged at one end of the mentioned frame in order to provide suction into the tested fabric plane during the SGHP test. The results of this investigation show that water vapour transport is increased by approximately 20% compared to the standard way of measurement by means of SGHP because of forced air fl ow in the plane of ribbed -channelled structure of the car seat middle layer. The fi ndings of this study have a number of important implications for future practice. The combination of a car seat cover with channelled structure and forced air fl ow improves physiological comfort of sitting which is a key issue for both drivers and manufacturers. The suggested device for forced air fl ow convection in the plane of a car seat fabric has not yet been part of an actual car seat, however it is possible to use its principles in a smart car seat prototype. Keywords: physiological comfort, air suction, channelled fabric structure Izvleček

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Effects of heated seats in vehicles on thermal comfort during the initial warm-up period

Cited by 39 publications

References 15 publications

Impact of measurable physical phenomena on contact thermal comfort

Impact of measurable physical phenomena on contact thermal comfort

Development of an index for the sound and haptic quality of a seat belt

The Study of Fabric Performance for Car Seats

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