Influence of indoor air temperature and relative humidity on learning performance of undergraduates

Case Studies in Thermal Engineering, Год журнала: 2021, Номер 28, С. 101458 - 101458

Опубликована: Сен. 16, 2021

The indoor thermal environment plays an important role in learning performance, but many relevant studies have focused primarily on subjective evaluation and achievement of participants paid relatively little attention to the physiological state. To study effects air temperature relative humidity performance undergraduates, experiments coupled with a questionnaire inquiry were conducted undergraduate students subjected eight different temperatures levels. degree discomfort, fatigue, distraction, efficiency measured analyzed from psychological perspectives. These results showed that undergraduates performed better at 40% 24 °C. Learning variations consistent environmental comfort, impacted performances more than temperature. Low environments decreased overall performance; rooms maintained lowered reading speed, distraction by 23.3%, 12.2%, 61.1%, respectively, as compared room 20% humidity. Therefore, should be emphasized when designing spaces. This also confirmed pupil diameter could used index evaluate fatigue distraction.

Язык: Английский

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Modeling the impact of indoor relative humidity on the infection risk of five respiratory airborne viruses

Scientific Reports, Год журнала: 2022, Номер 12(1)

Опубликована: Июль 7, 2022

With a modified version of the Wells-Riley model, we simulated size distribution and dynamics five airborne viruses (measles, influenza, SARS-CoV-2, human rhinovirus, adenovirus) emitted from speaking person in typical residential setting over relative humidity (RH) range 20-80% air temperature 20-25 °C. Besides transformation virus-containing droplets due to evaporation, respiratory absorption, then removal by gravitational settling, model also considered mechanism ventilation. The trend magnitude RH impact depended on virus. For rhinovirus adenovirus humidifying indoor 20/30 50% will be increasing infection risk, however, this risk increase negligible for weak adenovirus. Humidification have potential benefit decreasing only influenza when there is large decrease 20 50%. Regardless dry solution composition, humidification overall via long-range transmission SARS-CoV-2. Compared at constant ventilation rate, rate moderate levels 0.5 → 2.0 h

Язык: Английский

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Off-the-shelf wearable sensing devices for personalized thermal comfort models: A systematic review on their use in scientific research

Journal of Building Engineering, Год журнала: 2023, Номер 70, С. 106379 - 106379

Опубликована: Март 30, 2023

Human thermal comfort depends on objective variables -related to the environment- and subjective variables, related physiological conditions. While former are relatively easy be measured, latter difficult investigated since differ from person they characterized by sudden variations over time. The recent spread of off-the-shelf wearable devices for monitoring bio-signals has considerably facilitate this challenging task. aim work is provide a detailed framework about use investigations. A systematic review 35 scientific papers -selected 302 results initial database query- was performed. highlight that wristbands (mainly, Empatica E4 Fitbit), headbands (i.e., Muse 2), chest bands BioHarness 3.0 Polar H7), miniature data loggers iButton), activity sensors Move 3) were whose predominant in Those adopted different purposes, namely finding correlations between signals sensations, training and/or validating models, improving acquisition, controlling HVAC systems. proposed could represent solid background future investigations which should focus two main research streams. first one at strengthening knowledge statistical sensations signals, as well defining standardized procedures model development validation. second stream integrating personalized models into control

Язык: Английский

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The impact of plants on the humidity of naturally-ventilated office indoor environments

Journal of Building Engineering, Год журнала: 2024, Номер 86, С. 108814 - 108814

Опубликована: Фев. 18, 2024

This study investigated the seasonal impact of indoor plants on humidity and air temperature three naturally-ventilated, unoccupied offices, with low exchange rates. The introduction 12 Ficus or 6 Epipremnum resulted in a small but significant increase office's (28 m3) moisture content, measured every 5 min for 24-h periods up to six test days during spring winter, compared without plants. Depending season, emitted between 35 g (in winter) 58 summer) via evapo-transpiration (ET), per plant, day. In summer, however, due higher room rates, we did not detect despite plants' ET Most from all seasons was removed through sorption. Air rate had greater RH than Additional controlled-environment chamber studies showed there is difference humidification capacity five different plant species. Leafy highest under tested environmental conditions would have greatest potential environments. Succulent Sansevieria lowest rate, significantly bare substrate; this species present good choice environments where contribution required. rates were at ambient high temperatures; thus, water vapour by be made hot, dry lower cool rooms levels.

Язык: Английский

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Fast prediction for multi-parameters (concentration, temperature and humidity) of indoor environment towards the online control of HVAC system

Building Simulation, Год журнала: 2020, Номер 14(3), С. 649 - 665

Опубликована: Сен. 8, 2020

Abstract Heating, ventilation and air conditioning (HVAC) systems are the most energy-consuming building implements for improvement of indoor environmental quality (IEQ). We have developed optimal control strategies HVAC system to respectively achieve selections rate supplied temperature with consideration energy conservation, through fast prediction methods by using low-dimensional linear model (LLVM) based artificial neural network (ANN) (LLTM) contribution ratio climate (CRI (T) ). To be continued integrated multi-parameters, we further humidity (LLHM) (CRI(H)), thermal sensation index (TS) assessment. CFD was used construct database CO 2 , humidity. Low-dimensional models (LLM), including LLVM, LLTM LLHM, were adopted expand sake data storage reduction. Then, coupling ANN, CRI (H) distributions concentration, temperature, rapidly predicted on basis LLVM-based LLTM-based LLHM-based respectively. Finally, according self-defined indices (i.e., E V T H ), balancing between IEQ (indicated PMV TS) consumption rate, humidity) synthetically evaluated. The total could reduced 35% strength current strategies. This work can contribute development intelligent online systems.

Язык: Английский

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Physical workplaces and human well-being: A mixed-methods study to quantify the effects of materials, windows, and representation on biobehavioral outcomes

Building and Environment, Год журнала: 2022, Номер 224, С. 109516 - 109516

Опубликована: Авг. 23, 2022

Язык: Английский

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Symptoms of dry eye related to the relative humidity of living places

Contact Lens and Anterior Eye, Год журнала: 2023, Номер 46(4), С. 101865 - 101865

Опубликована: Май 17, 2023

To investigate the impact of relative humidity (RH) and climate variables place residence on symptoms dry eye disease (DED) in primary care practice.A cross-sectional analysis Ocular Surface Disease Index (OSDI) classification 1.033 patients [classified as non-DED (OSDI ≤22) DED >22)] was conducted a multicentre study Spain. Participants were classified according to 5-year RH value (data from Spanish Climate Agency -www.aemet.es) into two groups: those who lived low (<70%) places high (≥70%) places. Additionally, differences daily records (EU Copernicus Change Service) assessed.The prevalence 15.5% (95% CI 13.2%-17.6%). with <70% showed higher (17.7%; 95% 14.5%-21.1%; P < 0.01 adjusted for age sex) than ≥70% (13.6%; 11.1%-16.7%) closer, but not statistically significant, risk (OR = 1.34, 0.96 1.89; 0.09) previously described factors [age older 50 years 1.51, 1.06 2.16; 0.02) female sex 1.99, 1.36 2.90; 0.01)]. Some data significant (P 0.05) between participants (mean wind gusts; atmospheric pressure; mean minimum humidity); these did significantly increase close 1.0 > 0.05).This is first describe dryness symptomatology Spain, confirming that live locations have (corrected DED. These findings support use databases research.

Язык: Английский

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Integrative medicine considerations for convalescence from mild-to-moderate COVID-19 disease

EXPLORE, Год журнала: 2020, Номер 18(2), С. 140 - 148

Опубликована: Дек. 23, 2020

The majority of individuals infected with SARS-CoV-2 have mild-to-moderate COVID-19 disease. Convalescence from (MtoM) disease may be supported by integrative medicine strategies. Integrative Medicine (IM) is defined as healing-oriented that takes account the whole person, including all aspects lifestyle. strategies support recovery MtoM are proposed given their clinically studied effects in related conditions. Adoption an anti-inflammatory diet, supplementation vitamin D, glutathione, melatonin, Cordyceps, Astragalus and garlic potential utility. Osteopathic manipulation, Qigong, breathing exercises aerobic exercise pulmonary recovery. Stress reduction, environmental optimization, creative expression aromatherapy can provide healing minimize enduring trauma. These modalities would benefit clinical trials people recovering infection.

Язык: Английский

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Dry eye symptoms in offices and deteriorated work performance – A perspective

Building and Environment, Год журнала: 2020, Номер 172, С. 106704 - 106704

Опубликована: Янв. 29, 2020

Irritated, stinging, tired, and dry eyes continue to be among top-two reported acute symptoms in modern office-like environments, despite use of new ventilation strategies low-emitting building materials. In this perspective, we disentangle why the prevalence external eye has remained stable without a noticeable decline over last decades. Furthermore, explore association between symptoms, perceived air deteriorated office work performance. The overall (as opposed internal) is caused by combination many environmental (climatic), occupational, personal risk factors, which alter stability precorneal tear film, essential for ocular surface health comfort. composition structure outer lipid layer film critical healthy surface. Identified major factors are apart from age gender, diseases (gland dysfunctions), particle (combustion) exposure, (e.g. climatic condition), occupational (visual demanding work) medication) conditions that aggravate stability, increases its vulnerability aggressive pollutants. It is, however, salient recognize (mild) (generally non-diagnosed) contribute may further overlap with both internal causalities. Thus, maintenance relief symptoms. Studies indicate indoor air, quality complaint, part induced low humidity, negatively affects Visual complaints like generally associated fatigue as workers, feel during typical intensive vision work, self-report lower performance symptoms; exacerbate workers elderly female workers.

Язык: Английский

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Indoor air humidity revisited: Impact on acute symptoms, work productivity, and risk of influenza and COVID-19 infection

International Journal of Hygiene and Environmental Health, Год журнала: 2023, Номер 256, С. 114313 - 114313

Опубликована: Дек. 27, 2023

Recent epidemiological and experimental findings reconfirm that low indoor air humidity (dry air) increases the prevalence of acute eye airway symptoms in offices, result lower mucociliary clearance airways, less efficient immune defense, deteriorate work productivity. New research also support environmental conditions for risk infection influenza COVID-19 virus is lowest Goldilocks zone 40–60% relative (RH) by decrease airways' susceptibility, which can be elevated particle exposure. Furthermore, RH generation infectious laden aerosols exhaled from infected people. In general, elevation dry health airways concomitantly with viability virus. Thus, negative effects ventilation outdoor (low absolute humidity) should assessed according to 1) weakened functionality 2) increased possible transmissibility virus, 3) evaporation containing droplets out droplet nuclei (also at high room temperature), their floating time air. The removal acid-containing ambient filtration pH, viruses, infection, synergistically may further increase dilution pollutants compared beneficial control center RH, an essential factor optimal additional positive impact on symptoms, productivity, reduced infection.

Язык: Английский

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