scholarly journals ANÁLISE DE CONDIÇÕES TÉRMICAS NOS BLOCOS DIDÁTICOS DA UNIVERSIDADE FEDERAL DE GOIÁS - REGIONAL CATALÃO

2016 ◽  
Vol 11 (3) ◽  
Author(s):  
Débora Adiane Borges ◽  
Ed Carlo Rosa Paiva ◽  
Antover Panazzolo Sarmento ◽  
André Alves de Resende
Keyword(s):  
Thermal Stress ◽  
Thermal Comfort ◽  
Effective Temperature ◽  
Educational Institution ◽  
Thermal Conditions ◽  
Thermal Discomfort ◽  
Air Conditioners ◽  
Maximum Value ◽  
Para Determinar ◽  
Autumn And Winter

RESUMO: Este trabalho objetivou analisar as condições térmicas dos blocos didáticos da Universidade Federal de Goiás, Regional Catalão. O conforto térmico foi avaliado pela ISO 7730 (ISO, 2005) por meio dos índices PMV e PPD e das prescrições da NR 17 (BRASIL, 1978), enquanto o estresse térmico foi avaliado pelo valor máximo do IBUTG conforme a NR 15 (BRASIL, 1978) e a NHO 06 (BRASIL, 2002). As medições foram realizadas na sala 301 do Bloco Didático 1 (BD1) utilizando-se um medidor de estresse térmico para medir o IBUTG e as temperaturas de bulbo seco, bulbo úmido e globo, usadas para determinar a temperatura efetiva e os índices PMV e PPD com o auxílio dos programas Grapsi v. 5.1 e Ladesys v. 1.0. A sala foi considerada desconfortável por calor principalmente na primavera e verão, enquanto no outono e inverno houve dias confortáveis para ela desocupada, sem garantir que permaneceria confortável quando cheia de alunos. Possíveis soluções para o problema seria a colocação de brises na fachada esquerda do BD1, arborização e instalação de climatizadores. As contribuições deste trabalho envolveram a análise do desconforto térmico em uma instituição de ensino e os possíveis impactos na produtividade, motivação por mais pesquisas na área e a citação de estratégias para amenizar o desconforto térmico. ABSTRACT: This study aimed to analyze the thermal conditions of the Education Center at the Federal University of Goiás, Regional Catalão. Thermal comfort was evaluated by ISO 7730 (ISO 2005) through of PMV and PPD indexes and the requirements of NR 17 (BRAZIL, 1978), while the thermal stress was evaluated by the WBGT maximum value according to NR 15 (BRAZIL, 1978 ) and NHO 06 (BRAZIL, 2002). Measurements were performed at classroom 301 of the Education Center 1 using a thermal stress meter to measure the WBGT and dry bulb temperature, wet bulb and globe, used to determine the effective temperature and PMV and PPD indexes with the help of programs Grapsi v. 5.1 and Ladesys v. 1.0. The classroom was considered uncomfortable for heat mainly in spring and summer, while in autumn and winter there were comfortable days to empty classroom, without to ensure that it remained comfortable in the classroom full of students. Possible solutions to the problem would be put solar protections in the left side of the Education Center I, forestation and air conditioners installation. The contributions of this work involved the analysis of thermal discomfort in an educational institution and the possible impacts on productivity, motivation for further research in the area and the citation of strategies to mitigate the thermal discomfort.

scholarly journals Thermal Indices Influence on Occupants’ Window Opening Behaviours: A Case of Ibadan and Ogbomoso, Oyo State, Nigeria

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Abdulrasaq Kunle Ayinla ◽  
Ilelabayo Ismail Adebisi ◽  
Olubunmi Adedayo Olaoye ◽  
Emmanuel Oloruntoba Aina
Keyword(s):  
Thermal Stress ◽  
Thermal Comfort ◽  
Thermal Conditions ◽  
Climatic Data ◽  
Indoor Climate ◽  
Thermal Indices ◽  
Chi Square ◽  
Air Conditioners ◽  
Window Opening ◽  
Chi Square Analysis

Window opening operations are considered as one of the significant way of regulating indoor climate and maintaining thermal comfort in buildings, even when alternative active devices such as fans and air conditioners are available. This study investigates responses of occupants of the traditional core areas of Ibadan and Ogbomoso to thermal comfort conditions (thermal stress) through window opening behaviours. Climatic data of the two cities were subjected to Evans scale to predict their day and night thermal stress and questionnaires were administered to know how occupants respond to changing thermal conditions through window opening behaviours. Descriptive and inferential statistics were used in analysing the data.The study found the morning periods to be the most comfortable, the afternoon periods offer the most hot discomfort condition and cold discomfort is mostly experienced in the evening periods in both cities. Findings revealed that majority of occupants in both cities prefer to keep their windows opened in the morning and afternoon periods and an increase was observed in the numbers of occupants who prefer to keep their windows closed in the evening periods. This is an indication that building occupants in both cities actively respond to thermal stress using window opening operations. Results obtained from chi square analysis concluded that there is a significant relationship between occupants’ window opening behaviour and thermal conditions at different periods of the day in both cities. Recommendations were given on how to improve on window opening systems in the future.

scholarly journals Simulation of thermal comfort on public space and buildings around river in Banjarmasin-Indonesia

2022 ◽  
Vol 1212 (1) ◽  
pp. 012008
Author(s):  
A Rahman
Keyword(s):  
Thermal Comfort ◽  
Public Space ◽  
Effective Temperature ◽  
Rural Areas ◽  
Thermal Conditions ◽  
Concrete Construction ◽  
Validation Data ◽  
Wood Construction ◽  
Gathering Place ◽  
The City

Abstract The climate and environmental aspects are one of the things that affect architectural products. The city as a gathering place that interacts for a particular purpose has influenced the shape and visual of the city. The density of buildings in a city has affected the urban microclimate. Urban get hotter than rural areas. Urban planners need to pay attention to several aspects related to the solution to the design of the humid tropics. The concept of greening the city evenly and thoroughly, so that the thermal is not too high that can affect comfort. In this research used Rhinoceros 5, Grasshopper, Ladybug, and ladybug for simulation and validation data of wet bulb temperature on a psychometric chart and CBE Thermal Comfort Tool from ASHRAE-55 standard. The purpose of this study used simulation is to facilitate and predict the thermal conditions of buildings and the environment. This application is also used by researchers and architect designers. Based on the simulation, the indoor maximum effective temperature and standard effective temperature are always uncomfortable zones. The building condition with wooden construction is higher of thermal comfort compared with concrete construction buildings and the wood construction is faster reaches maximum value compared to concrete construction.

scholarly journals Thermal Comfort Level Assessment in Urban Area of Petrolina-PE County, Brazil

2017 ◽  
Vol 32 (4) ◽  
pp. 555-563 ◽  
Author(s):  
Pedro Vieira de Azevedo ◽  
Péricles Tadeu da Costa Bezerra ◽  
Mario de Miranda Vilas Boas Ramos Leitão ◽  
Carlos Antonio Costa dos Santos
Keyword(s):  
Thermal Comfort ◽  
Urban Area ◽  
Rural Areas ◽  
Urban Areas ◽  
Thermal Conditions ◽  
Comfort Level ◽  
Urban Heat Islands ◽  
Thermal Discomfort ◽  
Heat Islands ◽  
Urban And Rural Areas

Abstract This study evaluated the thermal conditions of urban areas in Petrolina-PE, from continuous data collected in urban and rural areas for the year of 2012. The results characterized urban heat islands (UHI) with varying intensity in urban areas, especially UHI = 5.3 °C (high intensity) occurred on April 28, 2012. It was evident that the constituent elements of urban areas contribute to the formation and expansion of UHI bringing thermal discomfort for its inhabitants. An adaptation to Thom’s equation for calculating the Thermal Discomfort Index (DIT), was used to obtain the maximum (DITx) and minimum (DITm) thermal discomfort. In the urban area, the DITm indicated thermal comfort in 23.0% of the days and partial comfort in 77.0% of days surveyed. Already, the DITx characterized 71.6% of days with partial comfort and 28.4% of days with thermal discomfort. In the rural area, The DITm indicated that 41.5% of days were thermally comfortable and 58.5% of days had partial comfort. However, the DITx pointed 87.7% of the days of this environment with partial thermal comfort and 12.3% of thermally uncomfortable days. Finally, the results showed that afforestation of urban area constitutes to an effective and efficient way to mitigate thermal discomfort.

scholarly journals Passive Cooling Solutions to Improve Thermal Comfort in Polish Dwellings

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3648
Author(s):  
Joanna Ferdyn-Grygierek ◽  
Krzysztof Grygierek ◽  
Anna Gumińska ◽  
Piotr Krawiec ◽  
Adrianna Oćwieja ◽  
...  
Keyword(s):  
Thermal Comfort ◽  
Energy Efficient ◽  
Thermal Conditions ◽  
Efficient Solutions ◽  
Climatic Conditions ◽  
Passive Cooling ◽  
Thermal Discomfort ◽  
Controlled Systems ◽  
Thermal Calculations ◽  
Family Building

The household sector in Poland consumes more than 25% of final energy. At the same time, residents reported dissatisfaction with the thermal conditions during the summer months. This paper details the search for passive and energy-efficient solutions to improve thermal comfort in Polish dwellings. A five-story, multi-family building was selected for this research. Analyses were conducted in apartments located on the top two floors using EnergyPlus (for thermal calculations) and CONTAM (for air exchange calculations) simulation programs for current and future climatic conditions. The stochastic behavior of people when opening windows and automatically controlled systems supplying external air to the building was considered. Airing the apartments by opening windows increased the heating demand but reduced the number of thermal discomfort hours by over 90%. The degree of airing by opening windows depends on residents opening their windows; therefore, a mechanical supply of external air controlled by both internal and external temperatures was proposed and tested.

scholarly journals Sensasi Termal Pelajar di Dalam Ruang Kelas

NALARs ◽  
2020 ◽  
Vol 19 (2) ◽  
pp. 81
Author(s):  
Humairoh Razak ◽  
Fitri Wulandari
Keyword(s):  
Climate Change ◽  
Thermal Comfort ◽  
Effective Temperature ◽  
School Environment ◽  
Air Conditioning ◽  
Qualitative Method ◽  
Thermal Conditions ◽  
Primary Sources ◽  
Global Emission ◽  
Quantitative And Qualitative Methods

ABSTRAK. Kota Banjarmasin memiliki iklim tropis lembab, kenyamanan termal menjadi unsur kenyamanan yang vital untuk dicapai khususnya untuk efektifitas kegiatan belajar bagi pelajar. Terutama dengan terjadinya pemanasan global, penggunaan penghawaan buatan seperti Air Conditioning (AC) justru akan memperparah terjadinya climate change karena AC merupakan salah satu sumber utama penghasil emisi. Metode pelaksaan penelitian ini dengan menggabungkan metode kuantitatif dan kualitatif. Metode kuantitatif digunakan untuk mengetahui kondisi termal di dalam dan di luar ruang kelas dengan mencari temperatur efektif kondisi termal di dalam ruang kelas dan kondisi iklim lingkungan sekolah dengan menggunakan alat environmental meter. Sedangkan metode kualitatif untuk mengetahui sensasi termal yang dirasakan pelajar saat berada di dalam ruang kelas, pengambilan data dilakukan 3 kali dengan interval 2 jam dimulai pukul 08.00 WITA. Hasil penelitian menunjukan bahwa sensasi termal yang dirasakan oleh pelajar pada pukul 08.00 dan pukul 10.00 WITA kurang dari 30% yang merasa nyaman saat berada di dalam ruang kelas dan tersisa hanya 5.14% pelajar yang merasa nyaman pada pukul 12.00 WITA. Puncaknya pada pukul 12.00 WITA saat matahari berada persis di puncak tertinggi 93.15% pelajar merasakan kepanasan, yaitu terasa agak panas, panas dan panas sekali. Hal ini didukung dengan data kuantitatif yang temperatur efektif di dalam ruang kelas berada di atas batas kenyamanan Webb, yaitu 30.58°C TE pada pukul 08.00 WITA, meningkat menjadi 31.38°C TE pada pukul 10.00 WITA dan puncak tertinggi pada pukul 12.00 WITA mencapai 31.57°C TE. Kata kunci: Kenyamanan Termal, Temperatur Efektif, Lubang Udara, Ruang Kelas, Ventilasi Silang ABSTRACT. Banjarmasin city has a humid tropical climate, which makes thermal comfort one of the vital comfort elements to be achieved. Especially for the effectiveness of the students' learning activities. Global warming is a hot topic today; the use of artificial ventilation such as air conditioning (AC) will aggravate climate change. AC is one of the primary sources of global emission. This research used both quantitative and qualitative methods. The quantitative approach is used to determine thermal conditions inside and outside the classroom by finding the classroom's effective temperature and school environment using environmental meter tools. On the other hand, the qualitative method is used to determine student's thermal sensations inside the classroom. Data collection was carried out three times in 2-hour intervals starting at 08.00 WITA. The results showed that the students' thermal feeling inside the classroom at 8:00, and 10:00 WITA was less than 30% who felt comfortable while only 5.14% felt comfortable at 12.00 WITA. The peak is at 12.00 WITA when the sun is precisely at the highest peak, 93.15 % of students feel discomfort, which is feeling rather hot, hot, and very hot. This is supported by quantitative data where the effective temperature in the classroom is over Webb's comfort limit, which is 30.58 ° C ET at 08.00 WITA, increasing to 31.38 ° C at 10:00 WITA and the highest peak at 12.00 WITA reaching 31.57 ° C ET. Keywords: Thermal Comfort, Effective Temperature, Air Opening, Classroom, Cross Ventilation

scholarly journals Distribuição espaço-temporal do conforto térmico na malha cicloviária em Recife-PE

2020 ◽  
Vol 12 (6) ◽  
pp. 2313
Author(s):  
Rafael Silva Anjos ◽  
Ayobami Badiru Moreira ◽  
Tamires Gabryele de Lima Mendes ◽  
Tanelly Neriah Santos ◽  
Cleusa Aparecida Gonçalves Pereira Zamparoni ◽  
...  
Keyword(s):  
Thermal Comfort ◽  
Effective Temperature ◽  
Geographical Location ◽  
Temporal Distribution ◽  
Thermal Conditions ◽  
Northeastern Brazil ◽  
Physical Conditioning ◽  
Adverse Conditions ◽  
Historical Series ◽  
The Times

maioria dos casos, as condições do ambiente podem influenciar no condicionamento físico dos ciclistas, de acordo com o seu conforto térmico. Por isso, a proposta dessa pesquisa foi avaliar as condições de conforto térmico em toda a malha cicloviária em Recife, município situado no nordeste do Brasil. Para isso, foi necessário interpolar as médias mensais de umidade e temperatura do ar, nos horários de 6:00, 12:00 e 18:00, para posteriormente calcular a Temperatura Efetiva e produzir cartograficamente sua distribuição espacial. Foi identificado que o conforto térmico nas ciclofaixas estão relacionadas à hora, mês e localização geográfica das vias. Os resultados permitiram apontar que a sensação de calor leve nas ciclofaixas e ciclovias predominaram ao longo da série histórica. No entanto, outubro de 2015, às 6:00, apresentou sensações confortáveis em toda a malha cicloviária, enquanto janeiro de 2016 às 12:00 apresentou condições mais adversas para o ciclismo. Diante dos resultados analisados, propõe-se um planejamento urbano que leve em consideração o conforto térmico dos ciclistas assim como ações que promovam os cuidados necessários para os ciclistas em condições térmicas adversas, de acordo com o período e a área da prática do ciclismo. Spatial-temporal distribution of cycling in Recife-PE A B S T R A C TCycling is one of the sporting practices that is growing the most in urban spaces. Because it is practiced outdoors, in most cases, the conditions of the environment can influence the physical conditioning of cyclists, according to their thermal comfort. Therefore, the proposal of this research was to evaluate the thermal comfort conditions in the entire cycle network in Recife, a municipality located in northeastern Brazil. For this, it was necessary to interpolate the monthly averages of humidity and air temperature, at the times of  6:00, 12:00 and 18:00, to later calculate the Effective Temperature and produce cartographically its spatial distribution. It was identified that the thermal comfort in the cycle ranges are related to the time, month and geographical location of the tracks. The results allowed to point out that the sensation of light heat in the cycle ranges and cycle paths predominated throughout the historical series. However, October of 2015, at 6:00 am, presented comfortable sensations throughout the cycling network, while January of 2016 at 12:00 showed more adverse conditions for cycling. Considering the results analyzed, it is proposed an urban planning that takes into account the thermal comfort of cyclists as well as actions that promote the necessary care for cyclists in adverse thermal conditions, according to the period and the area of cycling practice.Keywords: thermal comfort, cycle path, effective temperature.

scholarly journals Conforto Térmico em Habitações de Interesse Social: um Estudo Aplicado a uma Unidade de Saúde da Família

UNICIÊNCIAS ◽  
2018 ◽  
Vol 22 (1) ◽  
pp. 2
Author(s):  
Nara Kethilin França Silva ◽  
Thiago Fernandes ◽  
Jonathan Willian Zangeski Novais ◽  
Thaiany Fernandes ◽  
Alex Dias Curvo
Keyword(s):  
Public Health ◽  
Thermal Comfort ◽  
Thermal Conditions ◽  
Early Morning ◽  
Microsoft Excel ◽  
Mato Grosso ◽  
Air Conditioners ◽  
Warm Environment ◽  
The People ◽  
The One

Este trabalho foi realizado na cidade de Barra do Bugres, interior do Mato Grosso, em uma Unidade de Saúde Pública da família. A referida unidade não possui ares condicionados, dessa forma, o objetivo do trabalho foi avaliar as condições térmicas da ala de atendimento para propor melhorias em conforto térmico para as pessoas que o utilizam. Foi medida a temperatura do ar e umidade relativa, posicionando-se o equipamento no centro da ala de atendimento da unidade. As coletas de dados aconteceram durante os dias 24/05/2017, 25/05/2017, 26/05/2017 e 30/05/2017, período seco, entre as nove horas e onze horas (matutino) e das treze horas às quinze horas (vespertino), realizando aferimentos de 1 hora decorrente. Para geração do Índice de Temperatura e Umidade – ITU e Cartas Psicométricas de Givoni, se fez o uso do programa Microsoft Excel, versão 2013 e o software AnalysisBio, versão 1.0 criado pela LabEEE – UFSC. Os resultados indicaram que o dia 25/mai foi o que maior corroborou com desconforto térmico. Já os dias 26 e 31/mai foram os que apresentaram menos desconforto, sendo enquadrados na classificação de ambiente quente. O principal fator de amenização climática no local foi a sombra, apresentando percentuais elevados de requisição para ambos os períodos, bem como uso de ares condicionados e ventilação. Identificar o conforto térmico, no intuito de melhorar seu ambiente físico, foi de suma importância nessa pesquisa, principalmente, ao possibilitar incluir proposta de minimização do estresse e o desconforto na prestação de serviços à saúde pública.Palavras-chave: Conforto. Meio ambiente. Pacientes. Saúde pública.AbstractThis work was carried out in the city of Barra do Bugres, Mato Grosso, in a family public health unit . This unit does not have air conditioners, thus the objective of this work was to evaluate the thermal conditions of the service ward  to propose improvements of thermal comfort to the people who use it. Air temperature and relative humidity were measured by placing the equipment in the center of the service ward of the unit.  Data collection took place during the days 05/24/2017, 05/25/2017, 05/26/2017 and 05/30/2017, dry period between 9 am  and 11 am  (early morning) and the 01 pm and 03 pm  (afternoon), performing measurements  of 1 hour due. For the generation of the temperature and humidity index – ITU and  Psychometric Letters of  Givoni,  Microsoft Excel program, 2013 and software version AnalysisBio, version 1.0 created by LabEEE – UFSC were used. The results indicated that  May 25th  was the one  the  corroborated  the most with thermal discomfort.  Whereas  may 26th and 31st  were those which showed less discomfort, and fit into the warm environment classification. The main factor of climate in place was shadow, showing high percentages of request for both periods, as well as use of air conditioners and ventilation. Identifying the thermal comfort, in order to improve its  physical environment, was of paramount importance in this research, primarily by enabling to include proposal for minimization of stress and discomfort in the provision of public health services.Keywords: Comfort. Environment. Patients. Public health. 

scholarly journals Building Retrofit and Energy Conservation/Efficiency Review: A Techno-Environ-Economic Assessment of Heat Pump System Retrofit in Housing Stock

2021 ◽  
Vol 13 (2) ◽  
pp. 983
Author(s):  
Mustapha Mukhtar ◽  
Bismark Ameyaw ◽  
Nasser Yimen ◽  
Quixin Zhang ◽  
Olusola Bamisile ◽  
...  
Keyword(s):  
Energy Conservation ◽  
Thermal Comfort ◽  
Heat Pump ◽  
Cooling System ◽  
Commercial Buildings ◽  
Optimization Techniques ◽  
Hot Water ◽  
Environmental Benefits ◽  
Pump System ◽  
Air Conditioners

The world has not been able to achieve minimum greenhouse gas emissions in buildings’ energy consumptions because the energy and emissions optimization techniques have not been fully utilized. Thermal comfort is one of the most important issues for both residential and commercial buildings. Out of the 40% of global energy consumed by buildings, a large fraction is used to maintain their thermal comfort. In this study, a comprehensive review of the recent advancements in building energy conservation and efficiency application is presented based on existing high-quality research papers. Additionally, the retrofit of the heating/cooling and hot water system for an entire community in Cyprus is presented. This study aims to analyze the technical and environmental benefits of replacing existing electric heaters for hot water with heat pump water heating systems and the use of heat pump air conditioners for thermal comfort in place of the existing ordinary air conditioners for space heating and cooling. One administrative building, 86 apartments (including residential and commercial) buildings, and a restaurant building is retrofitted, and the feasibility of the project is determined based on three economic indicators, namely; simple payback period (SPP), internal rate of return (IRR), and net present value (NPV). The electrical energy required by the hot water systems and the heating/cooling system is reduced by 263,564 kWh/yr and 144,825 kWh/yr, respectively. Additionally, the retrofit project will reduce Cyprus’ CO2 emission by 121,592.8 kg yearly. The SPP, IRR, and NPV for the project show that the retrofit is economically feasible.

scholarly journals Examining the magnitude and perception of summertime overheating in London care homes

2021 ◽  
pp. 014362442110136
Author(s):  
Rajat Gupta ◽  
Alastair Howard ◽  
Mike Davies ◽  
Anna Mavrogianni ◽  
Ioanna Tsoulou ◽  
...  
Keyword(s):  
Thermal Comfort ◽  
Care Home ◽  
Thermal Conditions ◽  
Care Homes ◽  
Structured Interviews ◽  
Night Time ◽  
Institutional Practices ◽  
Subjective Data ◽  
Hybrid Buildings ◽  
Hot Weather

This paper brings together objective and subjective data on indoor temperature and thermal comfort to examine the magnitude and perception of summertime overheating in two London-based care homes occupying modern and older buildings. Continuous monitoring of indoor and outdoor temperature, relative humidity and CO2 levels was conducted in summer 2019 along with thermal comfort surveys and semi-structured interviews with older residents and staff of the care settings. Indoor temperatures were found to be high (>30°C) with bedroom temperatures often higher at night than daytime across both care settings. Limited opening due to window restrictors constrained night-time ventilation. Overheating was prevalent with four out of the five monitored bedrooms failing all four overheating metrics investigated. While 35–42% of staff responses perceived indoor temperatures to be uncomfortably hot, only 13–19% of resident responses were found to do so, indicating that elderly residents tend to be relatively insensitive to heat, leaving them open to overheating without realising it. Residents and staff in the modern care setting were less satisfied with their thermal conditions. As hybrid buildings, care settings need to keep both residents and staff comfortable and healthy during hot weather through night-time ventilation, management of heating and supportive institutional practices. Practical application: Care home designs have focused on keeping residents warm through the winter, neglecting the risks of summertime overheating. Care homes are hybrid buildings serving as living spaces for vulnerable older residents and offices/workspaces for staff. Providing comfort to both groups during periods of hot weather is challenging. Opportunities for ventilation are limited by Health & Safety regulations that mandate up to 10 cm maximum window openings and institutional practices that result in windows routinely kept closed, particularly at night. Utilising natural and where possible cross-ventilation should be considered along with external shading. Heating should be managed to avoid unwanted heat gains in the summer.

scholarly journals Thermal Comfort and Sleep Quality of Indonesian Students Living in Japan during Summer and Winter

Buildings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 326
Author(s):  
Wiwik Budiawan ◽  
Kazuyo Tsuzuki
Keyword(s):  
Sleep Quality ◽  
Thermal Comfort ◽  
Thermal Sensation ◽  
Thermal Conditions ◽  
Physical Conditions ◽  
Subjective Sleepiness ◽  
Adaptive Action ◽  
Quality Sleep ◽  
Sleep Parameters

Thermal comfort is crucial in satisfaction and maintaining quality sleep for occupants. In this study, we investigated the comfort temperature in the bedroom at night and sleep quality for Indonesian students during summer and winter. Eighteen male Indonesian students aged 29 ± 4 years participated in this study. The participants had stayed in Japan for about six months. We evaluated the sleep parameters using actigraphy performed during summer and winter. All participants completed the survey regarding thermal sensation, physical conditions, and subjective sleepiness before sleep. The temperature and relative humidity of participants’ bedrooms were also measured. We found that the duration on the bed during winter was significantly longer than that during summer. However, sleeping efficiency during winter was significantly worse than that during summer. The bedroom temperature of the participants was in the range of comfort temperature in Indonesia. With the average bedroom air temperature of 22.2 °C, most of the participants still preferred “warm” and felt “slightly comfortable” during winter. The average comfort temperature each season calculated using the Griffiths method was 28.1 °C during summer and 23.5 °C during winter. In conclusion, differences in adaptive action affect bedroom thermal conditions. Furthermore, habits encourage the sleep performance of Indonesian students.

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