THE EFFECT GEOMETRIC PATTERN OF ROSTER OPENINGS ON AIR FLOW DISTRIBUTION AND TEMPERATURE IN PONTIANAK CITY MOSQUE

• Main Author: Arinta Hapsari, Danti
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/77188
• Institution: Institut Teknologi Bandung

Pontianak City is located on the equatorial trajectory obtained high solar radiation on buildings, causing a hot sensation while in the room. Indoor heat temperature can be reduced to achieve comfort through a passive cooling design with natural ventilation techniques in the building envelope, one of which is the roster ventilation model. Most of the envelopes of mosques buildings in Indonesia apply roster on the walls as decorative ornaments which can also function as natural ventilation. Some of the results of the case study show that the different geometric opening patterns of the roster that are applied can affect the optimization of the roster as ventilation in distributing airflow to achieve comfortable temperatures in the mosque building. Therefore, it is necessary to conduct research on the effect of the geometric pattern of roster openings on the comfort of the distribution of airflow and temperature in mosque rooms, especially in Pontianak City. This research aims to find out how far the influence of the roster pattern shape applied to the mosque in Pontianak in distributing outside air throughout the room as an effort to reduce room temperature. The research uses a quantitative approach with five stages of data analysis which is divided into two parts of the analysis, namely the analysis of the aesthetic pattern and the analysis of the geometric pattern performance of the roster. First, an aesthetic analysis was carried out on the shape of the roster pattern by obtaining the results of the roster applied to the Pontianak City Mosque classified into four basic geometric patterns, namely the grid-based roster arrangement pattern (a), nonperiodic octagonal (b), 10-point star (c), and a 16-point star (d). Then an analysis of the performance of the roster pattern is applied with the findings obtained based on the airflow velocity performance cluster, the effect of the perforation of the roster pattern with the result of the difference in the average airflow speed (?V) and the result of the difference in the average temperature (?T) of the existing mosque roster pattern in Pontianak that pattern 1.a which has the largest perforation area of the other patterns which is 42%, is more effective in distributing air from outside to the inside of the mosque with the result that the average difference in the speed of the existing airflow is the smallest at 0.01 m/s and creates a large temperature drop difference between outdoor and indoor temperatures of 4.47 (°C). Although the results show pattern 1.a can create a large difference in temperature reduction between outdoor and indoor temperatures of 4.47 (°C), the average outdoor and indoor temperature comfort in Pontianak City is above the uncomfortable category according to SNI 03-6572 -2001 which is above 28 (°C). Other variable parameters are required in reducing room temperature such as modification of the roster model or materials applied to the roster with a thin thickness that is able to distribute airflow from outside to all space of the room so as to create a roster pattern that is very effective as passive cooling, especially in mosque rooms. This research be expected can provide recommendations for knowledge in the application and development of the most influential roster pattern in distributing airflow from outside to indoors to achieve thermal comfort in mosque buildings in Indonesia, especially in Pontianak City.