Temperature field of bed climate and thermal comfort assessment based on local thermal sensations

Song, Cong; Liu, Yanfeng; Zhou, Xiaojun; Wang, Xingwei; Li, Jing; Liu, Jiaping

doi:10.1016/j.buildenv.2015.09.023

Cited by 52 publications

(17 citation statements)

References 36 publications

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“…Hence, our observations favor the idea that bedroom temperature, at least over the range recorded in this study, need not seriously impact temperature within bed microclimate. This has also been observed by several previous studies . This also explains why T skin and NBT did not correlate well to T air (correlation results provided with Supporting Information).…”

Section: Discussionsupporting

confidence: 87%

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Window/door opening-mediated bedroom ventilation and its impact on sleep quality of healthy, young adults

et al. 2017

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This work examined window/door opening as means of bedroom ventilation and the consequent effect upon occupants' sleep, using data from 17 healthy volunteers. Bedroom CO level, temperature, and relative humidity were measured over 5 days, for two cases: open window or door (internal, bedroom door), and closed window and door. Participant filled questionnaires and sleep diary provided subjective measure of sleep quality. Actigraphy objectively monitored the participants during sleep. Additionally, a FlexSensor, placed under pillows of participants, detected movement during sleep. Average CO level for the Open conditions was 717 ppm (SD = 197 ppm) and for Closed conditions was 1150 ppm (SD = 463 ppm). Absolute humidity levels were similar for both conditions, while Open conditions were slightly cooler (mean = 19.7°C, SD = 1.8°C) than Closed (mean = 20.1°C, SD = 1.5°C). Results showed significant correlations (P < .001) between actigraphy data and questionnaire responses for: sleep latency (r = .45), sleep length (r = .87), and number of awakenings (r = .28). Of all analyzed sleep parameters, questionnaire-based depth of sleep (P = .002) and actigraphy-based sleep phase (P = .003) were significantly different between Open and Closed conditions.

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Section: Discussionsupporting

confidence: 87%

“…It may be noted here that the higher noise This has also been observed by several previous studies. 2,[42][43][44][45] Future studies may dwell on reliable methods for extracting data that may be used to estimate clo value of the sleeping participants. But monitoring bedding microclimate objectively could be a suitable solution.…”

Section: Experimental Designmentioning

confidence: 99%

Window/door opening-mediated bedroom ventilation and its impact on sleep quality of healthy, young adults

et al. 2017

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“…It is possible that the thermal insulation provided by wool fibers could be explained by the structure and composition of the wool (the crimped nature, fabric construction, and fiber conductivity). 11 , 12 , 29 It is generally accepted that thermal resistance is directly correlated to fabric thickness. However, it should be emphasized that neither standard thickness nor thermal resistance tests (eg, AS2001 and ISO11092) have been developed to cater for composite, high-bulk materials bedding that are of highly variable thickness due to incorporation of patterned quilting.…”

Section: Discussionmentioning

confidence: 99%

The effects of fabric for sleepwear and bedding on sleep at ambient temperatures of 17°C and 22°C

Shin¹,

Halaki²,

Swan³

et al. 2016

NSS

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The fibers used in clothing and bedding have different thermal properties. This study aimed to investigate the influences of textile fabrics on sleep under different ambient temperature (Ta) conditions. Seventeen healthy young participants (ten males) underwent nine nights of polysomnography testing including an adaptation night. Participants were randomized to each of the three binary factors: sleepwear (cotton vs wool), bedding (polyester vs wool), and Ta (17°C vs 22°C with relative humidity set at 60%). Skin temperature (Tsk) and core temperature (Tc) were monitored throughout the sleep period. Sleep onset latency (SOL) was significantly shortened when sleeping in wool with trends of increased total sleep time and sleep efficiency compared to cotton sleepwear. At 17°C, the proportion of sleep stages 1 (%N1) and 3 (%N3) and rapid eye movement sleep was higher, but %N2 was lower than at 22°C. Interaction effects (sleepwear × Ta) showed a significantly shorter SOL for wool than cotton at 17°C but lower %N3 for wool than cotton at 22°C. A significantly lower %N2 but higher %N3 was observed for wool at 17°C than at 22°C. There was no bedding effect on sleep. Several temperature variables predicted the sleep findings in a stepwise multiple regression analysis and explained 67.8% of the variance in SOL and to a lesser degree the %N2 and %N3. These findings suggest that sleepwear played a contributory role to sleep outcomes and participants slept better at 17°C than at 22°C.

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“…To describe the visual course of heat transfer between the person and the mattress, the heat loss and heat transfer in bed environment can be characterized by measuring the changes in the temperature of human-mattress interface. 14,17 To improve the understanding of the thermal comfort of human-mattress interface, the understanding of the effect of different mattress materials on human thermal comfort is necessary. Priego Quesada et al 17 suggested that a mattress composed of phase change materials (PCMs) can improve the thermoregulatory efficiency.…”

Section: Introductionmentioning

confidence: 99%

Exploring the effect of mattress cushion materials on human–mattress interface temperatures, pre-sleep thermal state and sleep quality

Zhou

Shen

et al. 2020

Indoor and Built Environment

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A comfortable mattress can create a good sleep environment, but the thermal behaviour of the interaction between the human body and mattress materials is still not well understood. The effect of mattress materials on human–mattress interface temperature and human thermal state was evaluated by subjective questionnaire and measurements to detemine the human–mattress interface temperatures of the whole body and various locations of the body (WTH-M and ETH-M). The woollen fabric and polymeric foam of mattresses were evaluated as optimal cushion materials; these were indicated by measurements at 15.5 and 20°C, due to the higher WTH-M and ETH-M. Moreover, the interface temperatures measured at the back, buttock and thigh were higher with most materials than at other parts of the body, indicating a lower temperature response at the body extremities due to the body–mattress interface. Under the cold climate, people would prefer warm thermal sensation rather than the neutral thermal feeling. There should be more consideration on the thermal insulation of the extremities such as the feet. The human thermal response was not only affected by mattress materials, but also by body parts and indoor air temperatures. These findings are important to understand the heat transfer and human thermal comfort requirements, providing a comfortable thermal environment to ensure sleep quality.

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Temperature field of bed climate and thermal comfort assessment based on local thermal sensations

Cited by 52 publications

References 36 publications

Window/door opening-mediated bedroom ventilation and its impact on sleep quality of healthy, young adults

Window/door opening-mediated bedroom ventilation and its impact on sleep quality of healthy, young adults

The effects of fabric for sleepwear and bedding on sleep at ambient temperatures of 17°C and 22°C

Exploring the effect of mattress cushion materials on human–mattress interface temperatures, pre-sleep thermal state and sleep quality

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Temperature field of bed climate and thermal comfort assessment based on local thermal sensations

Cited by 52 publications

References 36 publications

Window/door opening-mediated bedroom ventilation and its impact on sleep quality of healthy, young adults

Window/door opening-mediated bedroom ventilation and its impact on sleep quality of healthy, young adults

The effects of fabric for sleepwear and bedding on sleep at ambient temperatures of 17&deg;C and 22&deg;C

Exploring the effect of mattress cushion materials on human–mattress interface temperatures, pre-sleep thermal state and sleep quality

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Product

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The effects of fabric for sleepwear and bedding on sleep at ambient temperatures of 17°C and 22°C