On the use of facial and neck cooling to improve indoor occupant thermal comfort in warm conditions

Yang, Bin; Lei, Tze‐Huan; Wang, Faming; Yang, Pengfei

doi:10.1101/2021.10.24.465522

Cited by 4 publications

(1 citation statement)

References 38 publications

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“…Van Gaever et al reported that current technical standards on heating, ventilation, and air conditioning (HVAC) fail to provide a comfortable thermal environment for all members of surgical staff in the OR [28]. Moreover, it should be considered that there is a need to look for better wearable personal cooling systems to improve local body cooling while working in indoor environments, as reported by Yang et al, who investigated personal thermal management systems (PTMSs) [29]. However, despite the assumption that thermal comfort also plays a decisive role in the therapeutic outcome and in the surgical performance of the operators, there is still a lack of data in this regard.…”

Section: Discussionmentioning

confidence: 99%

Head Regional Differences in Thermal Comfort: Evaluating a Novel Surgical Helmet Cooling Method with Phase Change Material

Mercurio,

Galasso,

de Filippis

et al. 2023

Surgeries

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Thermal comfort is a significant factor in maintaining a satisfactory perception of the body temperature and influences behavioral thermoregulation. This pilot study aimed to investigate regional differences in thermal comfort in the head and neck areas by applying a surgical helmet equipped with cooling pads containing octadecane (CAS 593-45-3) as a phase change material (PCM) in healthy volunteers. Forty-three surgeons and nurses were enrolled. Octadecane is an odorless alkane hydrocarbon with an appearance of white crystal and a melting point of 28 °C. The PCM pads, each with a diameter of 5 cm and containing 7 g of octadecane, were placed between the helmet and the wearer’s head directly in contact with the skin. To identify the areas of the head and neck investigated, the surface was sampled and numbered, with the identification of a total of 38 different locations. A climate chamber maintained at 23–26 °C was used for the experiment. Thermal comfort of the stimulated area was reported by the subjects in an evaluation questionnaire at the end of the local stimulation conducted for 1 h. The sensations were reported as 1 (maximum uncomfortable) to 7 (maximum cold comfort), with 4 indicating a neutral sensation. The duration of the thermal comfort effect was also recorded. The highest mean value reported was 6 in five areas. The frontal region, the frontotemporal region, and the neck region were the areas sensitive to thermal comfort. A neutral sensation was reported in 13 areas. No uncomfortable sensation was reported in any area. This pilot study provides preliminary evidence of the feasibility and potential benefits of integrating PCM cooling pads into surgical helmets to enhance thermal comfort.

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Section: Discussionmentioning

confidence: 99%

Head Regional Differences in Thermal Comfort: Evaluating a Novel Surgical Helmet Cooling Method with Phase Change Material

Mercurio,

Galasso,

de Filippis

et al. 2023

Surgeries

View full text Add to dashboard Cite

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Evaluation of Synchronous Use of Portable Personal Comfort and Environment Conditioning Systems in Real Office Occupancy Conditions

Wegertseder-Martinez,

Berges-Alvarez,

Piderit-Moreno

2024

Buildings

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Personal Comfort Systems (PCSs) have emerged as an innovative solution to address variable individual conditions that traditional comfort models excluded. This study investigates the impact of the simultaneous application and use of three PCSs in real office environments on an occupant’s thermal, light, and air quality perception and seeks to understand different environmental stimuli behind personal actions and behaviors. It uses qualitative and quantitative monitoring of specific environmental conditions and individual actions of 72 participants in four office buildings in different climatic zones of Chile in summer and winter. The PCSs tested differ in their costs, technological level, usability, and portability. The results show that 85.5% improved their perceived comfort by using the PCSs, although not from simultaneous use, but rather from the use of one system over another. The desk fan stands out as having the highest acceptance and utilization rate. However, certain environmental conditions cause opposite actions: limited lighting control or little daylight causes the fan to be turned on. The present study’s data could contribute to a new environmental comfort model for shared office spaces, fostering significant improvements in occupant satisfaction and energy efficiency. This practical and scientific research is of interest to architects, designers, and stakeholders from the construction production field.

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Assessment of Thermal Comfort and Air Quality of Room Conditions by Impinging Jet Ventilation Integrated with Ductless Personalized Ventilation

et al. 2022

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Advanced ventilation methods are responsible for creating an appropriate temperature environment with satisfactory inhaled air quality. The ductless personalized ventilation system integrated with impinging jet ventilation shows the good ventilation performance. In order to investigate the effect of using such an integrated system on thermal comfort and air quality improvement. Twenty subjects participated in a chamber test at 25 °C, 27 °C, and 29 °C, respectively, with operating DPV devices at three modes (no flow, pre-set flow, and user control flow). Votes on thermal comfort, thermal sensation, thermal acceptability, and perceived air quality were collected from the them. The results showed that overall thermal sensation votes with DPV running at the user control flow mode were close to neutral (0.1, 0.4, and 0.5, respectively, at 25 °C, 27 °C, and 29 °C). Thermal comfort and perceived air quality were improved at all three temperatures studied in the user control DPV flow mode, with 90% of occupants reporting that the thermal environments were acceptable. An integrated system of this type could raise the acceptable HVAC temperature setpoint to 29 °C, resulting in an average energy savings of 34% over the neutral condition at 25 °C. Hence, occupants are advised to use the DPV’s user-control mode. Lastly, it is concluded that the integrated system could greatly improve thermal comfort, perceived air quality, and save HVAC energy, despite some issues with dry eyes at 29 °C.

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On the use of facial and neck cooling to improve indoor occupant thermal comfort in warm conditions

Cited by 4 publications

References 38 publications

Head Regional Differences in Thermal Comfort: Evaluating a Novel Surgical Helmet Cooling Method with Phase Change Material

Head Regional Differences in Thermal Comfort: Evaluating a Novel Surgical Helmet Cooling Method with Phase Change Material

Evaluation of Synchronous Use of Portable Personal Comfort and Environment Conditioning Systems in Real Office Occupancy Conditions

Assessment of Thermal Comfort and Air Quality of Room Conditions by Impinging Jet Ventilation Integrated with Ductless Personalized Ventilation

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