scholarly journals Indoor Thermal Performance of Ventilated Dwellings Using Fly Screens in the Hot-Humid Climate of Chennai, India

2009 ◽  
Vol 4 (2) ◽  
pp. 150-157 ◽  
Author(s):  
Vijayalaxmi J ◽  
S.P Sekar
Keyword(s):  
Solar Radiation ◽  
Air Temperature ◽  
Thermal Performance ◽  
Indoor Air ◽  
Tropical Climate ◽  
Summer Period ◽  
Humid Climate ◽  
Floor Area ◽  
Hot Humid Climate ◽  
Heating Up

In a hot-humid tropical climate, indoor thermal performance can be enhanced by comfort ventilation. Indoor ventilation depends upon building opening size. But risks involved in providing openings include ingress of mosquitoes and insects which thrive in the tropical climate. A practical and prevalent option to prevent insects in ventilated dwellings of the tropical, hot-humid city of Chennai, India is through the use of fly screens. Fly screens, when used over openings, prevent a certain quantum of solar radiation and wind from entering inside the rooms. Reduced direct solar radiation prevents the indoors from heating up, while reduced wind movement prevents the cross ventilation. Therefore, it is important to know the indoor thermal performance of ventilated rooms in the presence of fly screens with changing opening sizes. The criterion to evaluate indoor thermal performance in this paper is indoor air temperature. The aim of this research is to investigate the influence of fly screens on openings with varying sizes, in a naturally ventilated dwelling in the hot-humid climate of Chennai, India, during the summer period. The results of the study show that fly screens raise the indoor air temperature when openings are in the range of 100% to 35% of the room floor area. There is no significant change in the indoor air temperature when the opening sizes are less than 30% of the room floor area.

scholarly journals Investigation on the Temperature Distribution of Asphalt Overlay on the Existing Cement Concrete Pavement in Hot-Humid Climate in Southern China

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Zuzhong Li ◽  
Yayun Zhang ◽  
Chunguang Fa ◽  
Xiaoming Zou ◽  
Haiwei Xie ◽  
...  
Keyword(s):  
Wind Speed ◽  
Relative Humidity ◽  
Solar Radiation ◽  
Prediction Model ◽  
Air Temperature ◽  
Concrete Pavement ◽  
Humid Climate ◽  
Temperature Prediction ◽  
Asphalt Overlay ◽  
Hot Humid Climate

Temperature is known to be one of the most important factors affecting the design and performance of asphalt concrete pavement. The distresses of asphalt overlay are closely related to its temperature, particularly in Guangxi, a hot-humid-climate region in China. This research is to analyze the impact of meteorological factors on temperature at 2 cm depth in asphalt overlay by ReliefF algorithm and also obtain the temperature prediction model using MATLAB. Two test sites were installed to monitor the temperatures at different pavement depths from 2014 to 2016; meanwhile, the meteorological data (including air temperature, solar radiation, wind speed, and relative humidity) were collected from the two meteorological stations. It has been found that the temperature at 2 cm depth experiences greater temperature variation, and the maximum and minimum temperatures of asphalt overlay, respectively, occur at 2 cm depth and on the surface. Besides, the results of ReliefF algorithm have also shown that the temperature at 2 cm depth is affected significantly by solar radiation, air temperature, wind speed, and the relative humidity. Based on these analyses, the prediction model of maximum temperature at 2 cm depth is developed using statistical regression. Moreover, the data collected in 2017 are used to validate the accuracy of the model. Compared with the existing models, the developed model was confirmed to be more effective for temperature prediction in hot-humid region. In addition, the analysis of rutting depth and overlay deformation for the two test sections with different materials is done, and the results have shown that reasonable structure and materials of asphalt overlay are vital to promote the high-temperature antideforming capability of pavement.

scholarly journals Influence of Courtyard Ventilation on Thermal Performance of Office Building in Hot-Humid Climate: A Case Study

2018 ◽  
Vol 34 ◽  
pp. 02053
Author(s):  
Esra’a Sh. Abbaas ◽  
Ala’eddin A. Saif ◽  
MAC Munaaim ◽  
Md. Azree Othuman Mydin
Keyword(s):  
Relative Humidity ◽  
Air Temperature ◽  
Thermal Performance ◽  
Natural Ventilation ◽  
Office Building ◽  
Humid Climate ◽  
Airborne Pollutants ◽  
Indoor Sources ◽  
Hot Humid Climate

The influence of courtyard on the thermal performance of Development Department office building in University Malaysia Perlis (UniMAP, Pauh Putra campus) is investigated through simulation study for the effect of ventilation on indoor air temperature and relative humidity of the building. The study is carried out using EnergyPlus simulator interface within OpenStudio and SketchUp plug in software to measure both of air temperature and relative humidity hourly on 21 April 2017 as a design day. The results show that the ventilation through the windows facing the courtyard has sufficient effect on reducing the air temperature compared to the ventilation through external windows since natural ventilation is highly effective on driving the indoor warm air out to courtyard. In addition, the relative humidity is reduced due to ventilation since the courtyard has high ability to remove or dilute indoor airborne pollutants coming from indoor sources. This indicates that the presence of courtyard is highly influential on thermal performance of the building.

scholarly journals Thermal Performance of Vertical Courtyard System in Office Buildings Under Typical Hot Days in Hot-Humid Climate Area: A Case Study

2020 ◽  
Vol 12 (7) ◽  
pp. 2591
Author(s):  
Jin Wei ◽  
Fangsi Yu ◽  
Haixiu Liang ◽  
Maohui Luo
Keyword(s):  
Air Temperature ◽  
Thermal Performance ◽  
Weather Conditions ◽  
Office Buildings ◽  
Radiation Environment ◽  
Humid Climate ◽  
Hot Days ◽  
Cooling Effects ◽  
Hot Humid Climate

Due to the different types of courtyards in vertical courtyard system (VCS), their impacts on thermal performance in office buildings may vary. To better understand this issue, this paper investigates the thermal performance impact of three typical vertical courtyards. A field case study was conducted in VCSs during two typical extreme hot days under hot-humid climate conditions. The results show that the vertical courtyards have significant cooling effects under hot-humid climatic conditions. Via testing on linear, integrated, and rooftop courtyard with fusion layout, the fusion one has an obviously positive impact on air temperature reduction (4.3 °C). Compared with the linear and integrated courtyards, the maximum air temperature difference of fusion layout is around 1.6 °C. The thermal radiation environment of the fusion layout was better than that of the other two (linear and integrated). Besides, the surface temperature of the pavements (wood panel) in the vertical courtyards can reach 47 °C, while the vegetation can lower it by 8 °C under the same weather conditions. These findings show that the courtyard with fusion layout is more suitable for extreme hot weather conditions.

scholarly journals Peak indoor air temperature reduction for buildings in hot-humid climate using phase change materials

2020 ◽  
Vol 22 ◽  
pp. 100762
Author(s):  
Zeyad Amin Al-Absi ◽  
Mohd Isa Mohd Hafizal ◽  
Mazran Ismail ◽  
Ahmad Mardiana ◽  
Azhar Ghazali
Keyword(s):  
Phase Change ◽  
Air Temperature ◽  
Indoor Air ◽  
Phase Change Materials ◽  
Humid Climate ◽  
Temperature Reduction ◽  
Hot Humid Climate

scholarly journals Field Investigation of Indoor Thermal Performance in Malaysia Air-Welled Terraced House

2019 ◽  
Vol 6 (3) ◽  
pp. 33-41
Author(s):  
Pau Chung Leng ◽  
Roshida Abdul Majid ◽  
Noraslinda Abdul Rahman ◽  
Dilshan Remaz Ossen ◽  
Farhana Mohd Razif
Keyword(s):  
Air Temperature ◽  
Thermal Performance ◽  
Field Measurement ◽  
Cooling System ◽  
Tropical Climate ◽  
Weather Data ◽  
Vertical Position ◽  
Air Velocity ◽  
Humid Climate ◽  
Data Set

This paper aims to determine the performance of the air well system in a hot and humid tropical climate with existing full-scale air well of single-storey terraced house.  The application of air well in residential building widely applied in a traditional building, especially in the Middle East and Europe countries. However, resulted from the development, the application of passive cooling strategies such as air well is gradually replaced by a mechanical cooling system. The aim of the study is to investigate the cooling system role in tropics, where hot and humid climate the overheating of building interior are a critical dilemma due to solar penetration through building fenestration. A field measurement has been carried out in a single storey terraced house with built-in air well in Kuching, Sarawak for 5 days. The field measurement investigates the thermal performance of the single-storey terrace house air well under tropical context. The investigation was measured with U-12 HOBO data logger for temperature and humidity while the air velocity was measured with HD32.3 DeltaOhm measurement logger. Both types of the instrument placed in the air well in a vertical position while another U12 HOBO datalogger placed in a test room with window connected to air well.  The outdoor weather data set were measured with HOBO U30. Findings show that the under Malaysia tropical climate, the mean air velocity induced by the air well throughout the measurement days marked as 0.91m/s while during the hottest hour of the measurement days, the air velocity induced in the upper air well could reach 1.09m/s with an outdoor air temperature of 33.6°C and solar radiation of 198 Wh/m².  The findings of the study have explained the effectiveness of the air well in providing the thermal performance in the indoor environment and further study on modification of the air well configuration could enhance the airflow and air temperature

scholarly journals Daylighting Evaluation and Optimisation of Window to Wall Ratio for Lecture Theatre in the Tropical Climate

2021 ◽  
Vol 8 (1) ◽  
pp. 20-35
Author(s):  
Moses Iorakaa Ayoosu ◽  
◽  
Yaik-Wah Lim ◽  
Pau Chung Leng ◽  
Olusegun Moses Idowu ◽  
...  
Keyword(s):  
Architectural Design ◽  
Spatial Configuration ◽  
Tropical Climate ◽  
Base Case ◽  
Floor Plan ◽  
Humid Climate ◽  
Design For Sustainability ◽  
Ceiling Height ◽  
Lecture Theatre ◽  
Hot Humid Climate

A base case model is a more potent dose for applied research; the passive architectural design for sustainability requires optimised experiments. However, experimenting with physical developments require construction and deconstruction until they achieved the optimal scenario. These wastes resources and time; hence, base models' development as useful instruments in the optimisation design process is desirable. Lecture theatres in universities have no specific design model whereby optimising one may not apply to the other. Therefore, this research evaluated a base model for lecture theatre regarding spatial configuration, daylighting potentials, and optimised window-to-wall ratio (WWR) for tropical daylighting. A study of ten existing lecture theatres in eight universities within eight states in Nigeria's hot-humid climate was analysed descriptively for the base model. The study employed Simulations with IES-VE software. The daylighting performance analysis adopted the daylighting rule of thumb, daylight factor, work plane illuminance (WPI), and WPI ratio. The results show that a typical lecture theatre in the study area has a dimensional configuration of 12×20 m floor plan, 6 m ceiling height, and a window wall ratio (WWR) of 13%. In the deduced base model, 4H was required for adequate daylighting against the thumb's 2.5 H daylighting rule. The research concludes a low window-wall ratio with poor daylighting quality and quantities in the base model; therefore, it implies that the daylighting was not a criterion in the designs. However, the experiment revealed a progression in daylighting performance with an increase in WWR from the base case until 30% WWR. Beyond that, there was a decline in the daylighting performance. Therefore, 30% WWR was optimal for daylighting performance in lecture theatre retrofitting within the tropical climate.

scholarly journals User Thermal Comfort in Historic Buildings: Evaluation of the Potential of Thermal Mass, Orientation, Evaporative Cooling and Ventilation

2020 ◽  
Vol 12 (22) ◽  
pp. 9672
Author(s):  
Mamdooh Alwetaishi ◽  
Ashraf Balabel ◽  
Ahmed Abdelhafiz ◽  
Usama Issa ◽  
Ibrahim Sharaky ◽  
...  
Keyword(s):  
Thermal Comfort ◽  
High Altitude ◽  
Air Temperature ◽  
Thermal Performance ◽  
Indoor Air ◽  
Computer Modelling ◽  
Evaporative Cooling ◽  
Comfort Level ◽  
Thermal Mass ◽  
The Impact

The study investigated the level of thermal comfort in historical buildings located at a relatively high altitude in the Arabian Desert of Saudi Arabia. The study focused on the impact of the use of thermal mass and orientation on the level of thermal performance at Shubra and Boqri Palaces. Qualitative and quantitative analyses were used in this study, including a questionnaire interview with architecture experts living at the relatively high altitude of Taif city, to obtain data and information from local experts. The computer software TAS EDSL was used along with on-site equipment, such as thermal imaging cameras and data loggers, to observe the physical conditions of the building in terms of its thermal performance. The study revealed that the experts’ age and years of experience were important aspects while collecting data from them during the survey. The use of thermal mass had a slight impact on the indoor air temperature as well as the energy consumption, but it helped in providing thermal comfort. Use of ventilation can improve thermal comfort level. Evaporative cooling technique has a considerable impact on reducing indoor air temperature with 4 °C drop, improving the thermal comfort sensation level. The novelty of this work is that, it links the outcomes of qualitative results of experts with field monitoring as well as computer modelling. This can contribute as method to accurately collect data in similar case studies.

Study on Energy Saving of the Air-Conditioning Exhaust Heat Recovery System in Office Buildings

2015 ◽  
Vol 775 ◽  
pp. 44-49
Author(s):  
Yan Zou
Keyword(s):  
Thermal Performance ◽  
Heat Recovery ◽  
Sensible Heat ◽  
Humid Climate ◽  
Beijing Area ◽  
Heat Efficiency ◽  
Exhaust Heat ◽  
Recovery System ◽  
Heat Recovery System ◽  
Hot Humid Climate

The study analyzed the thermal performance of a sensible heat recovery system in an office building in Beijing area. Based on proposing the basic evaluation index of the thermal performance, the study analyzed the effect of outdoor temperature and wind speed on the heat recovery efficiency and the reduction of fresh air load. The analysis results show that, the operation effect of the sensible heat recovery device in winter is better. In winter, the sensible heat efficiency η is higher than 60%, the system has higher EER, and the fresh air load can be reduced more than 50%. While the sensible heat efficiency η is lower than 60% in most time in summer. And in a hot, humid climate, the recovery effect of sensible heat recovery device is significantly reduced.

scholarly journals Indoor Daylighting and Thermal Response of a Passive Solar Building to Selective Components of Solar Radiation

Buildings ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 34
Author(s):  
Ochuko Kelvin Overen ◽  
Edson Leroy Meyer ◽  
Golden Makaka
Keyword(s):  
Relative Humidity ◽  
Solar Radiation ◽  
Air Temperature ◽  
Indoor Air ◽  
Temperature Response ◽  
Longwave Radiation ◽  
Thermal Conditions ◽  
Visible Radiation ◽  
Downward Longwave Radiation ◽  
Passive Solar

Solar radiation provides the most significant natural energy in buildings for space heating and daylighting. Due to atmospheric interference, solar radiation received at the Earth’s surface consists of direct beam and diffuse radiation, where diffuse can be further broken down into longwave and visible radiation. Although each of these components co-occurs, their influence on the indoor visual and thermal conditions of a building differ. This study aims to analyze the influence of the various components of solar radiation on the indoor thermal and daylighting of a passive solar building. Thus, a pyrheliometer, pyranometer, shaded-pyranometer, and pyrgeometer mounted on a SOLYS 2 (Kipp & Zonen, Delft, Netherlands) dual Axis sun tracker, were used to monitor direct, global horizontal, diffuse and downward longwave radiation, respectively. The seasonal indoor air temperature and relative humidity were measured using an HMP 60 temperature relative humidity probe. A Li-210R photometric sensor was used to monitor the indoor illuminance. The summer and winter indoor air temperature, as well as relative humidity, were found to be influenced by diffuse horizontal and global horizontal irradiance, respectively. In summer, the indoor air temperature response to diffuse horizontal irradiance was 0.7 °C/ħW/m2 and 1.1 °C/ħW/m2 to global horizontal irradiance in winter, where ħ is 99.9 W/m2. The indoor daylighting which was found to be above the minimum office visual task recommendation in most countries, but within the useful daylight illuminance range was dominated by direct normal irradiance. A response of 260 lux/ħW/m2 was observed. The findings of the study support the strategic locating of the windows in passive solar design. However, the results show that north-facing clerestory windows without shading device could lead to visual discomfort.

scholarly journals PRINSIP DESAIN ARSITEKTUR BIOKLIMATIK PADA IKLIM TROPIS

2019 ◽  
Vol 6 (2) ◽  
pp. 87
Author(s):  
Jarwa Prasetya Sih Handoko ◽  
Ikaputra Ikaputra
Keyword(s):  
Architectural Design ◽  
Design Principles ◽  
Tropical Climate ◽  
Climatic Conditions ◽  
Building Envelope ◽  
Natural Conditions ◽  
Humid Climate ◽  
Hot Arid Climate ◽  
Hot Humid Climate ◽  
Tropical Climates

Arsitektur Bioklimatik adalah adalah suatu pendekatan desain yang mengarahkan arsitek untuk mendapatkan penyelesaian desain dengan mempertimbangkan hubungan antara bentuk arsitektur dengan lingkungan iklim daerah tersebut. Pendekatan ini menekankan pada aspek pemenuhan kesehatan dan kenyamanan ruangan bagi pengguna dan minimalisasi penggunaan energi pada bangunan. Sedangkan Tropis merujuk pada terminologi letak geografis daerah di sekitar equator diantara Garis Tropic of Cancer dan Tropic of Capricorn. Kajian ini membahas prinsip desain Arsitektur Bioklimatik pada iklim tropis. Dengan demikian dapat disusun theoritical framework terkait prinsip desain arsitektur pada iklim tropis. Metode yang digunakan pada kajian ini dengan menggunakan studi referensi. Dari kajian ini dapat disimpulkan bahwa Prinsip Desain Arsitektur Bioklimatik pada Iklim Tropis terdiri dari 2 (dua) tipe meliputi Prinsip desain untuk bangunan pada daerah Iklim Tropika Basah ( Hot humid Climate ) dan Prinsip desain untuk bangunan pada daerah iklim Tropika kering ( Hot Arid Climate ). Hal ini menyesuaikan kondisi iklim dimana bangunan tersebut didesain.PRINCIPLES OF BIOCLIMATIC ARCHITECTURAL DESIGN IN THE TROPICAL CLIMATE The growth of building construction that does not consider natural conditions causes the potential for environmental degradation due to energy consumption in buildings, which and results in the depletion of natural resource. In addition to the occurrence of global climate change phenomena that foster energy-intensive for buildings to fulfill the physical comfort. This condition raises awareness of the importance of architectural design based on local natural conditions including local climatic conditions or the utilization of bioclimatic potential. Bioclimatic Architecture is a design approach that directs architects to get a design finish by considering the relationship between architectural forms and the climate environment of the area. This study discusses the principles of Bioclimatic Architecture design in tropical climates. Thus the theoretical framework is expected to be arranged related to the principles of architectural design in tropical climates. Tropical climate refers to the terminology of the geographical location of the area around the equator between the Tropic of Cancer and Tropic of Capricorn Lines. The method used in this study is a literature study or reference study. From this study it can be concluded that the principles of Bioclimatic Architectural Design in Tropical Climates consist of 2 (two) types, including design principles for buildings in the Hot Humid Climate area which has 2 seasons and design principles for buildings in dry tropical climate regions (Hot Arid Climate) with 4 seasons. These two design principles are influenced by several different climatic conditions between these two climatic regions. These two regions generally have high air temperatures; the difference is the diurnal temperature difference between the two climate regions. This condition requires a different response, especially in the design of the building envelope, where the design of the building envelope influences the level of heat gain and heat loss in the effort to create indoor thermal comfort in the building.

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