scholarly journals Influence of Structure and Wall Materials on Building Thermal Performance

2019 ◽  
Author(s):  
Mahatma Sindu Suryo
Keyword(s):  
Air Temperature ◽  
Thermal Performance ◽  
Building Materials ◽  
Infrared Camera ◽  
Steel Structure ◽  
National Standard ◽  
Passive Cooling ◽  
Clay Brick ◽  
Local Climate ◽  
Wall Materials

The passive cooling technique is a strategy to improve building thermal performance which is cost-effective, eco-friendly and best suited for the local climate. The building material is one of the elements in passive cooling techniques. The research aims to investigate the influence of building materials on building thermal performance by field measurements on test houses. Hobo data loggers were used to collect indoor air temperature and relative humidity data. FLIR Infrared Camera was used to collect surface temperature data. The National Standard for Ventilation and Air Conditioning system (SNI 03-6572-2001) used as a reference for thermal performance value. The scope of the research is investigating the influence of the structure and wall materials on building thermal performance. The structure materials for the experiment were steel material and concrete material. The wall materials for this experiment were clay brick, light concrete brick (AAC), GRC-Rockwool panel and GRC-Styrofoam Panel. This research showed that steel structure influences the increasing indoor building air temperature. Clay brick material with higher thermal conductivity values has longer duration above the warm comfort zone rather than other wall materials in this experiment.

Study on Indoor Thermal Environment with Building Materials of Urban Residences in Zhejiang Region: Summer Investigation

2012 ◽  
Vol 568 ◽  
pp. 35-38
Author(s):  
Jing Hui Ma ◽  
Yan Gao
Keyword(s):  
Aluminum Alloy ◽  
Thermal Performance ◽  
Urban Areas ◽  
Building Materials ◽  
Thermal Environment ◽  
Residential Buildings ◽  
Indoor Thermal Environment ◽  
Indoor Thermal Comfort ◽  
Building Characteristics ◽  
Wall Materials

The aim of the present study is to clarify the actual conditions of indoor thermal environment with building materials, which built after 1980 years in urban areas of Zhejiang Province. In this paper, the investigations about building characteristics and indoor thermal environment were carried out in Hangjiahu Plain, Zhenan hills and mountains etc. The results show that the wall materials of the most residential buildings are clay solid bricks, the most windows type is aluminum alloy, and the most buildings are uninsulated. In summer, over half of the air- conditions operate more than 6 hours in residential buildings. The indoor thermal comfort is strongly affected by thermal performance of windows.

scholarly journals Numerical assessment of brick walls` use incorporating a phase change material towards thermal performance in buildings during a passive cooling strategy

2020 ◽  
Vol 24 (3 Part B) ◽  
pp. 1909-1922
Author(s):  
Zohir Younsi ◽  
Hassan Naji
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Thermal Performance ◽  
Building Materials ◽  
Performance Enhancement ◽  
Numerical Approach ◽  
Building Envelope ◽  
Passive Cooling ◽  
Volume Method ◽  
Change Material

The integration of new building materials incorporating phase change material (PCM) into the building envelope leads to an increase of the heat storage capacity, which may have an influence on minimizing the cooling demand and heating of the building. This work addresses a thermal performance enhancement of brick walls with incorporated PCM. The improvement has been assessed through a numerical approach in dealing with a 1-D transient conduction problem with phase change, while leaning on experimental results from a transient guarded hot plates method. The simulations have been fulfilled using a hybrid method combining both the finite volume method and an enthalpy porosity technique. The results of this combined approach are in good agreement. In the light of the findings obtained, it appears that PCM incorporation into a brick masonry can both reduce peak temperatures up to 3?C and smooth out daily fluctuations. Thereby, the evaluation achieved can turns out useful in developing brick walls with an incorporated PCM for passive cooling, thus improving buildings thermal performance.

scholarly journals Urban Heat Island in Mediterranean Coastal Cities: The Case of Bari (Italy)

Climate ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 79 ◽  
Author(s):  
Alessandra Martinelli ◽  
Dionysia-Denia Kolokotsa ◽  
Francesco Fiorito
Keyword(s):  
Urban Heat Island ◽  
Air Temperature ◽  
National Standard ◽  
Heat Island ◽  
Night Time ◽  
Local Climate ◽  
Sea Breezes ◽  
Pollution Levels ◽  
Air Temperatures ◽  
Urban Heat

In being aware that some factors (i.e. increasing pollution levels, Urban Heat Island (UHI), extreme climate events) threaten the quality of life in cities, this paper intends to study the Atmospheric UHI phenomenon in Bari, a Mediterranean coastal city in Southern Italy. An experimental investigation at the micro-scale was conducted to study and quantify the UHI effect by considering several spots in the city to understand how the urban and physical characteristics of these areas modify air temperatures and lead to different UHI configurations. Air temperature data provided by fixed weather stations were first compared to assess the UHI distribution and its daily, monthly, seasonal and annual intensity in five years (from 2014 to 2018) to draw local climate information, and then compared with the relevant national standard. The study has shown that urban characteristics are crucial to the way the UHI phenomenon manifests itself. UHI reaches its maximum intensity in summer and during night-time. The areas with higher density (station 2—Local Climate Zone (LCZ) 2) record high values of UHI intensity both during daytime (4.0 °C) and night-time (4.2 °C). Areas with lower density (station 3—LCZ 5) show high values of UHI during daytime (up to 4.8 °C) and lower values of UHI intensity during night-time (up to 2.8 °C). It has also been confirmed that sea breezes—particularly noticeable in the coastal area—can mitigate temperatures and change the configuration of the UHI. Finally, by analysing the frequency distribution of current and future weather scenarios, up to additional 4 °C of increase of urban air temperature is expected, further increasing the current treats to urban liveability.

scholarly journals The thermal phenomena of Aceh tradisional house due to changes inform spatial planning, building materials and constructure structures

2021 ◽  
Vol 881 (1) ◽  
pp. 012042
Author(s):  
H Sawab ◽  
A Shah ◽  
K Lahna ◽  
Nizarli ◽  
T Ivan
Keyword(s):  
Air Temperature ◽  
Thermal Performance ◽  
Environmental Conditions ◽  
Spatial Planning ◽  
Building Materials ◽  
Human Life ◽  
Thermal Perception ◽  
Main Building ◽  
Thermal Phenomena ◽  
House Building

Abstract The development of science and technology has influenced the pattern of human life, especially the housing as the basic needs in human life. This can also be seen in the Acehnese people who have made changes to their traditional houses which will unwittingly have an impact on the thermal performance of the building.. This study observes the thermal perception of the occupants of the original and changing Aceh traditional houses, in the form of their responses or reactions in describing environmental conditions when the air temperature is hot, normal, or cold, which is carried out by distributing questionnaires. Measurements were made on traditional house buildings and their occupants for 7 (seven) days on each house. As a thermal reference for occupancy, air temperature conditions in buildings and rooms will be measured using a Thermo Hygrograph and a Sling Thermometer. The results of this study indicate that there is a change in the thermal perception of occupancy in the form of a comfort range and length of time when the building is inhabited, which is caused by changes made to the traditional house building, in the form of adding another room at the back without disturbing the main building (Rumoh Aceh) using other materials and different buildings structures (not a stilt house like the main building).

scholarly journals Thermal Performance of Single-Story Air-Welled Terraced House in Malaysia: A Field Measurement Approach

2020 ◽  
Vol 13 (1) ◽  
pp. 201
Author(s):  
Pau Chung Leng ◽  
Gabriel Hoh Teck Ling ◽  
Mohd Hamdan Ahmad ◽  
Dilshan Remaz Ossen ◽  
Eeydzah Aminudin ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Air Temperature ◽  
Thermal Performance ◽  
Field Measurement ◽  
Natural Ventilation ◽  
Residential Buildings ◽  
Wet Bulb Globe Temperature ◽  
Natural Lighting ◽  
Ventilation Performance ◽  
Globe Temperature

The provision requirement of 10% openings of the total floor area stated in the Uniform Building By-Law 1984 Malaysia is essential for natural lighting and ventilation purposes. However, focusing on natural ventilation, the effectiveness of thermal performance in landed residential buildings has never been empirically measured and proven, as most of the research emphasized simulation modeling lacking sufficient empirical validation. Therefore, this paper drawing on field measurement investigates natural ventilation performance in terraced housing with an air-well system. The key concern as to what extent the current air-well system serving as a ventilator is effective to provide better thermal performance is to be addressed. By adopting an existing single-story air-welled terrace house, indoor environmental conditions and thermal performance were monitored and measured using HOBO U12 air temperature and humidity, the HOBO U12 anemometer, and the Delta Ohm HD32.3 Wet Bulb Globe Temperature meter for a six-month duration. The results show that the air temperature of the air well ranged from 27.48 °C to 30.92 °C, with a mean relative humidity of 72.67% to 79.25%. The mean air temperature for a test room (single-sided ventilation room) ranged from 28.04 °C to 30.92 °C, with a relative humidity of 70.16% to 76.00%. These empirical findings are of importance, offering novel policy insights and suggestions. Since the minimum provision of 10% openings has been revealed to be less effective to provide desirable thermal performance and comfort, mandatory compliance with and the necessity of the bylaw requirement should be revisited.

scholarly journals Heatwaves and Summer Urban Heat Islands: A Daily Cycle Approach to Unveil the Urban Thermal Signal Changes in Lisbon, Portugal

Atmosphere ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 292 ◽  
Author(s):  
Ana Oliveira ◽  
António Lopes ◽  
Ezequiel Correia ◽  
Samuel Niza ◽  
Amílcar Soares
Keyword(s):  
Climate Change ◽  
Air Temperature ◽  
Wind Direction ◽  
Urban Heat Islands ◽  
Daily Cycle ◽  
Local Climate ◽  
Thermal Signal ◽  
Air Temperatures ◽  
Local Climate Change ◽  
Urban Heat

Lisbon is a European Mediterranean city, greatly exposed to heatwaves (HW), according to recent trends and climate change prospects. Considering the Atlantic influence, air temperature observations from Lisbon’s mesoscale network are used to investigate the interactions between background weather and the urban thermal signal (UTS) in summer. Days are classified according to the prevailing regional wind direction, and hourly UTS is compared between HW and non-HW conditions. Northern-wind days predominate, revealing greater maximum air temperatures (up to 40 °C) and greater thermal amplitudes (approximately 10 °C), and account for 37 out of 49 HW days; southern-wind days have milder temperatures, and no HWs occur. Results show that the wind direction groups are significantly different. While southern-wind days have minor UTS variations, northern-wind days have a consistent UTS daily cycle: a diurnal urban cooling island (UCI) (often lower than –1.0 °C), a late afternoon peak urban heat island (UHI) (occasionally surpassing 4.0 °C), and a stable nocturnal UHI (1.5 °C median intensity). UHI/UCI intensities are not significantly different between HW and non-HW conditions, although the synoptic influence is noted. Results indicate that, in Lisbon, the UHI intensity does not increase during HW events, although it is significantly affected by wind. As such, local climate change adaptation strategies must be based on scenarios that account for the synergies between potential changes in regional air temperature and wind.

Sign in / Sign up

Export Citation Format

Share Document