مجال التميز | تميز دراسي وبحثي |
البحوث المنشورة |
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البحث (1): | |
عنوان البحث: |
Experimental field study of the integration of passive and evaporative cooling techniques with Mashrabiya in hot climates |
رابط إلى البحث: |
https://www.sciencedirect.com/science/article/abs/pii/S0378778820304618 |
تاريخ النشر: |
24/07/2020 |
موجز عن البحث: |
Mashrabiya is one of the primary features of Arab-Islamic architecture which can be found and still used in different cities around the world. It can be defined as an opening covered with wooden lattice for ventilation, daylight, privacy, and an aesthetic appeal for houses. The motivation for this work stems from the lack of existing field studies on the ventilation and thermal performance of buildings incorporated with Mashrabiya and the potential to enhance its capabilities by combining it with different passive cooling techniques. The present study aims to investigate the influence of Mashrabiya on the indoor environment in a traditional building situated in a hot climate. The case study selected for this work is the Baeshen House which is located in the heart of historic Jeddah and the area with the most traditional Mashrabiyas in Saudi Arabia. The field data of air temperature, relative humidity, globe temperature, and air velocity were collected for two similar rooms (one open Mashrabiya and one close) in the building during typical hot summer conditions when the outdoor temperature ranged between 40 and 41.6 °C in the afternoon. Different techniques of passive/evaporative cooling strategy were integrated with the Mashrabiya: thermal mass, water pots, water spray, and cloth. The results showed that the closed Mashrabiya contributed to reducing the flow of hot air into rooms during the afternoon, and the indoor temperature was maintained at 35.4–35.8 °C. Increasing the speed of airflow into the room by opening the Mashrabiya had a minimal effect during the afternoon, but it was observed that the night cooling improved. It was found that the most effective strategy was the use of wetted cloth near the inlet of the Mashrabiya (33.8 °C indoor average when the outdoor temperature was at 41.6 °C). The study demonstrated that comfortable conditions could be attained between 1 and 9 a.m. during hot summer conditions. Overall, the Mashrabiya with evaporative cooling was not able to provide comfort during the midday, and other strategies should be considered for hot summer conditions. Future work will focus on investigating different materials and strategies to enhance the performance of Mashrabiyas. |
البحث (2): | |
عنوان البحث: |
Evaluation of the Integration of the Traditional Architectural Element Mashrabiya into the Ventilation Strategy for Buildings in Hot Climates |
رابط إلى البحث: | |
تاريخ النشر: |
20/01/2021 |
موجز عن البحث: |
This paper reviewed related research works and developments on the traditional architectural element “mashrabiya” focusing on its history, design and structure, typology, and functions in hot climates. Moreover, the paper assessed the effect of the traditional mashrabiya on the indoor thermal environment and thermal comfort in a selected case study building. For this purpose, two similar rooms were investigated in a selected historic building with abundant mashrabiyas located in the Makkah Region, specifically in Old Jeddah, Saudi Arabia. The field tests were conducted during a typical hot summer month with two different configurations. The study demonstrated that opening the mashrabiya allowed more airflow into the room during the day and reduced the indoor temperature by up to 2.4 °C as compared to the closed mashrabiya. Besides, the building envelope played an important role in preventing the high fluctuation of the indoor air temperature, where the fluctuation of the rooms air temperature ranged between 2.1 °C and 4.2 °C compared to the outdoor temperature which recorded a fluctuation between 9.4 °C and 16 °C. The data presented here can be used for the future development of the mashrabiya concept and the potential incorporation with passive cooling methods to improve its design according to the requirements of modern buildings in hot climates. Moreover, further studies and tests on mashrabiyas under different climatic conditions are required. Also, the different strategies or materials can be incorporated with mashrabiyas in order to improve its thermal performance. |
المؤتمرات العلمية |
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المؤتمر (1): | |
عنوان المؤتمر: |
4th SEE SDEWES Conference on Sustainable Development of Energy, Water and Environment Systems |
تاريخ الإنعقاد: |
28/06/2020 |
مكان الإنعقاد: |
Sarajevo, Bosnia & Herzegovina |
طبيعة المشاركة: |
Oral presentation |
عنوان المشاركة: |
Experimental Field Study of the Integration of Passive and Evaporative Cooling Techniques with Mashrabiya in Hot Climates |
ملخص المشاركة: |
The accelerated development of Saudi Arabia during the last decades led to major changes in the economic, social, and buildings fields and experienced a high increase in energy demand. The traditional buildings in KSA have used different passive cooling techniques as high thermal mass, mashrabiya, and windcatcher aimed at reducing heat gain. Many research has indicated to revive mashrabiya and emphasize its importance while some studies have attempted to utilization mashrabiya traditionally, improved, or innovative form, and perhaps combine with new technologies to contribute to improving the indoor thermal environment or reducing energy use. However, the field experiments still few and not yet determine how well the mashrabiya can affect the indoor environment in residential buildings. Hence this study aims to investigate the effect of mashrabiya on the indoor thermal environment in a historical building a hot climate. Baeshen House is the case study of this work located in the old historic Jeddah between the traditional buildings and the richest area of mashrabiyas in KSA. The field measurements of the air temperature, relative humidity, globe temperature, and air velocity were conducted inside two rooms in addition to the courtyard of the building during summer 2019. Moreover, three different techniques of passive cooling were integrated and examined with the mashrabiya. The results demonstrated that both tested rooms in the standard mode when the mashrabiya was closed have a high similarity of performance, which confirms the validity of their comparison when the different positions. The thermal mass led delaying the passage of heat into the rooms about 3 hours beside maintaining the indoor temperatures from fluctuations between 33.2 and 38 ̊C. This study found that increasing the speed of airflow into the room through the open mashrabiya gave a feeling of comfort. By integrating different passive evaporative cooling techniques with mashrabiya, it was found the most effective strategy to improve the room air temperature was hanging wet cloth 1.7 % better than regular room beside gave the best feeling of comfort to the researcher compared to the other strategies. To concludes, the mashrabiya has a clear effect on the indoor thermal performance, whether it is closed or open beside the significant impact of the thermal mass. |
المؤتمر (2): | |
عنوان المؤتمر: |
4th SEE SDEWES Conference on Sustainable Development of Energy, Water and Environment Systems |
تاريخ الإنعقاد: |
29/06/2020 |
مكان الإنعقاد: |
Sarajevo, Bosnia & Herzegovina |
طبيعة المشاركة: |
Oral presentation |
عنوان المشاركة: |
Evaluation of the Integration of Mashrabiya into the Ventilation Strategy for Buildings in Hot Climates |
ملخص المشاركة: |
The accelerated development of Saudi Arabia during the last decades led to major changes in the economic, social, and buildings fields and experienced a high increase in energy demand. The traditional buildings in KSA have used different passive cooling techniques as high thermal mass, Mashrabiya, and windcatcher aimed at reducing heat gain. Mashrabiya is one of the prominent traditional architectural elements in Saudi can be defined as an opening covered by wooden lattice for ventilation, daylight, privacy, and aesthetic appeal for houses. This paper reviewed related research works and developments on the traditional architectural element, “Mashrabiya” focusing on its history, design and structure, typology, and functions in hot climates. Moreover, the paper assessed the effect of the traditional Mashrabiya on the indoor thermal environment and thermal comfort in a selected case study building. For this purpose, two similar rooms were investigated in a selected Historic building abundant with Mashrabiyas located in old Jeddah “Al-Balad”, Saudi Arabia. The field tests were conducted during a typical hot summer month with two different configurations. The study demonstrated that the Mashrabiya increased air movement and circulation inside the room during the day and reduced the indoor temperature by up to 4 °C as compared to the closed Mashrabiya. The thermal mass played a significant role in maintaining the indoor air temperature where the mean of air temperatures of the room with open Mashrabiya ranged between 33.8°C to 37°C and 37°C to 40.9°C in the room with close Mashrabiya. The data presented here can be used for the future development of the Mashrabiya concept and potential integration with other passive cooling strategies in order to improve its design according to the requirements of modern buildings in hot climates. Further studies are needed to carry out tests in other climatic conditions. In addition, the different strategies or materials can be incorporated with Mashrabiya in order to improve its thermal performance. |
الرابط: |
المرفقات
- https://uksacb.org/wp-content/uploads/ملخص-مشاركاتي-في-المؤتمر-SEE-SDEWES.pdf
- https://uksacb.org/wp-content/uploads/SEE_SDEWES2020_Certificate_of_Presentation.pdf
- https://uksacb.org/wp-content/uploads/SEE_SDEWES2020_Certificate_of_Attendance.pdf
- https://uksacb.org/wp-content/uploads/my-Full-Article-on-Elsevier.pdf
- https://uksacb.org/wp-content/uploads/1st-page-of-the-paper.pdf