An investigation of indoor thermal environments and thermal comfort in naturally ventilated educational buildings

Journal of Building Engineering, Год журнала: 2024, Номер 84, С. 108677 - 108677

Опубликована: Янв. 29, 2024

Indoor thermal conditions are essential in educational buildings. The health and well-being of students can be affected by a poor environment, which also has clear impact on building energy consumption. In this context, the indoor environment naturally ventilated university classrooms is explored study during complete academic year. A monitoring campaign questionnaire survey were conducted simultaneously higher education buildings Spain. total 2115 sets data collected. Thermal sensation prediction indices (predicted mean vote, extended predicted vote adaptive vote) applied to evaluate student’s perception their accuracy was assessed. Additionally, two machine-learning models, based Artificial neural network (ANN) random forest (FR) algorithms, formulated predict occupants’ sensation. obtained results evidenced that proposed ANN RF models outperform traditional indices. Finally, it an comfort model. suggest have greater capacity changes environmental than suggested ASHRAE-55 model they preferred with lower temperatures those EN-16798

Язык: Английский

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Analysis of determining factors in the thermal comfort of university students. A comparative study between Spain and Portugal

Energy and Buildings, Год журнала: 2024, Номер 308, С. 114022 - 114022

Опубликована: Фев. 17, 2024

The quality of the indoor thermal environment is essential because its impact on energy efficiency buildings and health well-being those who occupy them. This particularly important in educational direct student performance. Various factors, such as natural ventilation, have become relevant since COVID-19. Although this measure no longer mandatory, usefulness has been proven, it therefore interesting to evaluate understand comfort classrooms. In addition other aspects clothing, gender habits can also influence perception occupants. Therefore, study investigates these factors university Spain Portugal through a campaign measurements questionnaires. results showed that, according CO2 concentrations, ventilation strategies maintained more than Portugal. Also, protocols did not negative effect On hand, there were significant differences between student's responses two countries. fact, Portuguese students warmer preferences (Tn = 26.40 °C) Spanish 24.70 °C). Finally, clothing crucial factor comfort, with by country gender.

Язык: Английский

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Thermal comfort in university classrooms in humid subtropical climate: Field study during all seasons

Building and Environment, Год журнала: 2024, Номер 258, С. 111644 - 111644

Опубликована: Май 14, 2024

Язык: Английский

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Deriving thermal sensitivity across educational stages: Evidence-based definition of Griffiths' coefficient

Journal of Building Engineering, Год журнала: 2024, Номер 87, С. 109081 - 109081

Опубликована: Март 18, 2024

Thermal sensitivity directly impacts occupants' comfort by influencing neutral temperatures and models. The Griffiths method, commonly used to derive thermal sensitivity, often assumes a constant value of 0.5°C-1 for calculating temperatures. However, it is important note that can vary depending on factors such as building type, climatic conditions, operation mode (i.e., natural ventilation, mechanical or mixed mode), age. This study aims define whether age-dependent differences in exist schools, achieved through the formulation specific coefficients each educational stage. A field was conducted naturally ventilated classrooms within same climate zone, collecting 1548 subjective responses objective measurements from students across different stages. results demonstrate schools lower than assumed values, especially primary (0.085°C-1), increases with students' variation reflected corresponding temperatures, which also increase Using coefficient lead significant estimation errors temperature, potentially up 1 °C, impacting both energy consumption. emphasizes there are expectations related To improve reliability adaptive models ensure accurate estimations, essential future research consider age when evaluating sensitivity.

Язык: Английский

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Experimental research on energy utilization, aerosol transmission and thermal comfort under different ventilation strategies: Densely-occupied classrooms as a case study

Building and Environment, Год журнала: 2025, Номер unknown, С. 112523 - 112523

Опубликована: Янв. 1, 2025

Язык: Английский

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A study on adaptive thermal comfort and ventilation in Malaysia secondary school classrooms of tropical climate

Building and Environment, Год журнала: 2025, Номер unknown, С. 112701 - 112701

Опубликована: Фев. 1, 2025

Язык: Английский

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Development and comparison of adaptive data-driven models for thermal comfort assessment and control

Total Environment Research Themes, Год журнала: 2023, Номер 8, С. 100083 - 100083

Опубликована: Окт. 7, 2023

Thermal comfort prediction is an important issue, as it can largely influence occupants' well-being and buildings' energy consumption. Nowadays, models used to assess thermal have been increasingly discussed, a growing number of data-driven with several input parameters developed. Although these allow reasonably accurate predictions comfort, using complex algorithms determine might be unsuitable for some use cases, such quick estimations or real-time control Heating Ventilation, Air Conditioning (HVAC) systems. In this paper, model was developed based on 61710 samples subjective responses associated environmental from field studies available in two ASHRAE databases. Two resulted analysis, one higher accuracy simplified, which improved the comparison other regression PMV. However, since cannot conceived punctual condition, areas were derived, i.e., respective ranges at 90%, 80%, 70% acceptability. The result that error new below 90% acceptable range, means models' does not lead reduction evaluation occupant comfort. Built upon influential parameters, enable estimates occupant-cantered HVAC control. notion non-fixed state empowers more flexible building management criteria, reducing while upholding indoor

Язык: Английский

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Developing a new adaptive heat balance model to enhance thermal comfort predictions and reduce energy consumption

Energy and Buildings, Год журнала: 2024, Номер 321, С. 114663 - 114663

Опубликована: Авг. 14, 2024

Accurate thermal comfort prediction is essential for enhancing both and energy efficiency in buildings. The heat balance adaptive models, while widely used, have been often questioned relation to their strengths limitations. To overcome these challenges, a comprehensive understanding of the physical parameters influencing exchange occupants' capacities essential. This study introduces an analytical method formulate new model, adPMV, which integrates models considering various perception. model PMV with factor associated running mean outdoor temperature, line theory. Tested on 1377 samples from European university classrooms, adPMV demonstrates enhanced accuracy (MAE=0.74, RMSE=1.01, MBE=-0.11) compared other models. Validation naturally ventilated classrooms ASHRAE's databases further confirms promising results, showcasing reduced error indices (MAE=0.68, RMSE=0.81, MBE=-0.03). Notably, using setpoints not only improves sensation but also leads substantial reduction heating demand, reaching up 40 %. adaptability this different contexts, such as building types, climates, HVAC system operations, presents it versatile tool exploring principles.

Язык: Английский

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The impact of thermal comfort requirements on household heating energy consumption

Journal of Building Engineering, Год журнала: 2024, Номер 90, С. 109426 - 109426

Опубликована: Апрель 25, 2024

Язык: Английский

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Field study of meeting thermal needs of occupants in old residential buildings in low-temperature environments using personalized local heating

Building and Environment, Год журнала: 2023, Номер 247, С. 111004 - 111004

Опубликована: Ноя. 3, 2023

Язык: Английский

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