Ahmad Syuhada

Flower garden trees’ ability to absorb solar radiation heat for local heat reduction

Banda Aceh as an urban area tends to have a high air temperature than its rural surroundings. A simple way to cool Banda Aceh city is by planting urban vegetation such as home gardens or parks. In addition to aesthetics, urban vegetation plays an important role as a reducer of air pollution, oxygen producer, and reducer of the heat of the environment. To create an ideal combination of plants, knowledge about the ability of plants to absorb solar radiation heat is necessary. In this study, some types of flowers commonly grown by communities around the house, such as Michelia Champaka, Saraca Asoka, Oliander, Adenium, Codiaeum Variegatum, Jas Minum Sambac, Pisonia Alba, Variegata, Apium Graveolens, Elephantopus Scaber, Randia, Cordylin.Sp, Hibiscus Rosasinensis, Agave, Lili, Amarilis, and Sesamum Indicum, were examined. The expected benefit of this research is to provide information for people, especially in Banda Aceh, on the ability of each plant relationship in absorbing heat for thermal comfort in resid...

Characteristics of heat transfer on solar collector channel by using a sharp turn

The optimization of heat transfer from the solar energy collector is influenced by some fluid flow characteristics in the channel. However, a rectangular cross-section with 180° sharp turn is often used as a flow path on various types of thermal equipment. The flow pattern in the channel has a complex three-dimensional structure caused by the centrifugal force. Experiments were conducted in advance to investigate the thermal performance of the channel collectors with several variations, namely: non-turning channel, sharp multi-turn channel 90°, and sharp multipath channel 105°. The size of the collector was 250 cm × 80 cm, coated with thermal insulator in the form of black colored rubber with 10 mm thick. The solar radiation absorber used in this test was iron sand of 6 cm thickness. The iron sandbox was made of wood with a thickness of 15 mm and 5 mm glass with the size of 250 cm × 80 cm was used as the transparent cover. The position of the air heating box was made oblique with the aim that the air flow process can take place because of the difference in elevation between input and output. The results showed that the highest temperature distribution can be achieved by a collector with a sharp bend of the resistance angle of 105°, with maximum temperature of 84.3° C at 00:30 to 01:30 PM. The results of this study suggest that the type of sharp turning channel collector with a resistance angle of 105° has the ability to heat the air within the collector channel most optimally compared to other types tested.The optimization of heat transfer from the solar energy collector is influenced by some fluid flow characteristics in the channel. However, a rectangular cross-section with 180° sharp turn is often used as a flow path on various types of thermal equipment. The flow pattern in the channel has a complex three-dimensional structure caused by the centrifugal force. Experiments were conducted in advance to investigate the thermal performance of the channel collectors with several variations, namely: non-turning channel, sharp multi-turn channel 90°, and sharp multipath channel 105°. The size of the collector was 250 cm × 80 cm, coated with thermal insulator in the form of black colored rubber with 10 mm thick. The solar radiation absorber used in this test was iron sand of 6 cm thickness. The iron sandbox was made of wood with a thickness of 15 mm and 5 mm glass with the size of 250 cm × 80 cm was used as the transparent cover. The position of the air heating box was made oblique with the aim that the air flow...

Numerical study of heat transfer characteristics on Macchi package boiler (63-B4002) superheater tube in utility of PIM-2

Macchi Package Boiler is the main unit in PT Pupuk Iskandar Muda, which serves as a source of steam generators with superheater tubes as heat exchanger. The boiler system fails on the superheated tube so that the production of urea becomes disturbed. Therefore, an investigation based on thermal analysis is needed to analyze the cause of tube superheater package boiler failure. Linear one-dimensional mathematical approach used in this study is in an attempt to observe the behavior of heat transfer occurs through changes in inlet and outlet temperature and heat transfer rate. Completion numerically performed using the approach of finite difference method or finite difference method, and simulated using the software MatLab 2016a to facilitate observation of behavior change heat transfer system superheater in the form of three-dimensional graphics and two-dimensional graph. The simulation results show that the temperature will increase proportional to the length of the primary superheater and the secondary superheater and the temperature tends to decrease in the desuperheater. Saturated vapor entering the primary super heater will be superheated steam on the secondary super heater with a pressure 44 kg/cm2G and a temperature of 390°C.

Analysis of diffuser augmented wind turbine (DAWT) with flange and curved interior using CFD

Demand for electrical current is very high, especially for urban areas. To meet this condition, it is considered necessary to build a system that can function effectively. Micro-scale wind turbines would be a suitable choice to provide electricity particularly in residential areas. However, the wind velocity in Indonesia that only average less than 5 m/s may prove to be an obstacle that needs to be dealt with. One concept to solve problems in areas that have low wind speed is the use of Diffuser Augmented Wind Turbine (DAWT). DAWT is the development of horizontal wind turbines that use shroud as a concentrator that can boost a low wind speed. In this study, flanges and a curved interior were added to an existing DWAT design. A CFD simulation is used to obtain the suitable shape or design of the micro-scale wind turbines. Geometry obtained by using a diffuser with curved interior diameter of 115 mm, length 230 mm, the tilt angle of 9° and flange height is 0.6 h / D. Using this geometry specification, wind velocity is increased up to 2.15 times than free stream velocity.Demand for electrical current is very high, especially for urban areas. To meet this condition, it is considered necessary to build a system that can function effectively. Micro-scale wind turbines would be a suitable choice to provide electricity particularly in residential areas. However, the wind velocity in Indonesia that only average less than 5 m/s may prove to be an obstacle that needs to be dealt with. One concept to solve problems in areas that have low wind speed is the use of Diffuser Augmented Wind Turbine (DAWT). DAWT is the development of horizontal wind turbines that use shroud as a concentrator that can boost a low wind speed. In this study, flanges and a curved interior were added to an existing DWAT design. A CFD simulation is used to obtain the suitable shape or design of the micro-scale wind turbines. Geometry obtained by using a diffuser with curved interior diameter of 115 mm, length 230 mm, the tilt angle of 9° and flange height is 0.6 h / D. Using this geometry specification, wind ...

Heat transfer capability of solar radiation in colored roof and influence on room thermal comfort

Colored zinc is the most widely used by people in Indonesia as the roof of the building. Each color has different heat absorption capability, the higher the absorption capacity of a roof will cause high room temperature. A high temperature in the room will cause the room is not thermally comfortable for activity. Lack of public knowledge about the ability of each color to absorb heat can cause errors in choosing the color of the roof of the building so that it becomes uncomfortable regarding thermal comfort. This study examined how big the ability of each color in influencing the heat absorption on the roof of the zinc. The purpose of this study is to examine which colors are the lowest to absorb radiation heat. This research used theexperimental method. Data collected by measuring the temperature of the environment above and below the colored tin roof, starting at 11:00 am until 15:00 pm. The zinc roofs tested in this study are zinc black, red zinc, green zinc, blue zinc, brown zinc, maroon zinc, orange ...

Blade number impact on pressure and performance of archimedes screw turbine using CFD

Many rivers in Indonesia can be used as source of mini/micro hydro power plant using low head turbine. The most suitable type of turbine used in fluid flow with low head is the Archimedes screw turbine. The Archimedes screw hydro turbine is a relative newcomer to the small-scale hydropower that can work efficiently on heads as low as 10 meter. In this study, the performance of Archimedes water turbines that has different blade numbers that are thoroughly evaluated to obtain proper blade configuration. For this purpose, numerical simulations are used to predict the pressure changes that occur along the turbine. The simulation results show that turbines with an amount of two blades have more sloping pressure distribution so that it has better stability.

Analysis of wind energy potential for agriculture pump in mountain area Aceh Besar

In this study, the potential of wind power for agricultural pump driver in Saree mountainous area of Aceh Besar is analyzed. It is found that the average usable wind speed is 6.41 m/s, which is potential to produce 893.96 Watt of electricity with the wind turbine rotor diameter of 3 m. This energy can be used to drive up to 614 Watt of water pump with static head of 20 m to irrigate 19 hectare of land, 7 hours a day. HOMER analysis indicated the lowest simulated NPC value of USD 10.028 with CoE of USD 0.717 kWh. It is also indicated that the wind has potential to produce 3452 kWh/year with lifetime of 15 years.