https://ijatr.polban.ac.id/ijatr/issue/feed International Journal Applied Technology Research 2022-04-21T02:21:17+00:00 Prof. Dr. Ir. Kasni Sumeru ijatr@polban.ac.id Open Journal Systems <p>The International Journal of Applied Technology Research (IJATR), an academic journal in engineering and technology, was published by Bandung State Polytechnic, Indonesia. This OPEN ACCESS Journal aims to encourage and stimulate the exchange of discourse among professionals and academics worldwide on issues of applied technology research.</p> https://ijatr.polban.ac.id/ijatr/article/view/78 The Effect of Inclusion on Crack Propagation Using Extended Finite Element Method 2022-04-21T02:21:17+00:00 Luthfi Muhammad Mauludin luthfi-mm@polban.ac.id Aji Pratama Rendragraha aji_pratama.rendragraha@tu-dresden.de <p>Numerical simulation is developed to investigate the effect of inclusion on crack propagation. In this study, the crack growth is modeled using extended finite element method (XFEM). Two-dimensional rectangular plate with single inclusion embedded off-centered is modeled. The specimen is subjected to uniaxial tension. The dimensions of the specimen are 40 mm x 80 mm and the radius of the inclusion is 10 mm. The specimen is pre-cracked with the length of an edge crack is 5 mm. The motion of the crack is modeled by XFEM based on traction-separation cohesive behavior for 2D mixed mode problem. In addition, enrichment procedure is used to implicitly determine predefined crack in XFEM framework. Two different inclusions, which are soft and hard inclusions, are considered on crack propagation scheme. The effects of soft and hard inclusions on crack propagation are studied and observed. The results showed that the trajectory of crack highly depends on inclusion inside the material. In the case of soft inclusion, propagation of the crack tended to approach the inclusion. Whereas in the case of hard inclusion, crack trajectory tended to move away from the inclusion. The mismatch of elastic modulus between inclusion and surrounded materials has significant effect on propagation of crack.</p> 2022-04-17T03:25:44+00:00 ##submission.copyrightStatement## https://ijatr.polban.ac.id/ijatr/article/view/74 Performance Evaluation of Thermoelectric Cooling with Two Difference Fluids Medium 2022-04-21T02:21:17+00:00 Bowo Yuli Prasetyo bowo_yuli@polban.ac.id <p>Thermoelectric has been used in various applications related to cooling systems (TEC). Most researchers focused on expanding the application of TEC and improving heat transfer. The improvement of the heat transfer relied on the configuration, heat exchanger, and fluid medium. However, no previous work has reported the influence of air and water as the fluid’s medium on the TEC performance. Therefore, in this study, the performance of TEC with water and air as working fluids is evaluated experimentally. Besides, several input parameters are controlled to evaluate the TEC performance under different conditions. The results reveal that the variation of working fluid and input parameters influenced the overall TEC output. The increment of TEC cooling capacity is proportional to the input power, mass flow rate, and inlet temperature of the working fluid. While the input power and inlet temperature also vary the heat exchanger thermal resistance. The overall thermal resistance of the water block is averagely ten times lower than that of the heat sink, therefore, the water block is significantly better compared to the heat sink. While the highest COP obtained from the water and air system is 1.72 and 1.41, respectively.</p> 2022-04-17T03:30:37+00:00 ##submission.copyrightStatement## https://ijatr.polban.ac.id/ijatr/article/view/55 The effectiveness of precipitation pH and temperature of Mg/Al Hydrotalcite synthesis on the glucose isomerization 2022-04-21T02:21:17+00:00 Ayu Ratna Permanasari ayu.ratna@polban.ac.id <p>Mg/Al Hydrotalcite as the catalyst in isomerization of glucose into fructose was made by coprecipitation of Mg(NO3)2.6H2O and Al(NO3)3.9H2O. Operating condition of precipitation including the temperature and pH was determined by Response Surface Method (RSM). The catalyst synthesis was carried out in the mole ratio of Mg/Al 3:1 for 18 h and the catalyst was activated by calcination for 3 h at 500°C. Catalyst characterization was done by FTIR, BET, and XRD. The highest mass product of Hydrotalcite Mg/Al 4.52 g, reached at the precipitation conditions of pH 9 and temperature of 45ºC. The catalytic activity of hydrotalcite Mg/Al was tested by the isomerization of Glucose into Fructose. The highest yield and selectivity were 20.14%, 62.40%, respectively. It was reached in pH 9 and 45ºC. While the highest conversion, 53.47%, was achieved in the pH 11.12 with a precipitation temperature of 45ºC. By the RSM analysis, neither the mass of catalyst product nor the catalytic activity from the isomerization (yield, conversion, and selectivity) were affected significantly by the pH and temperature precipitation.</p> 2022-04-17T03:36:12+00:00 ##submission.copyrightStatement## https://ijatr.polban.ac.id/ijatr/article/view/76 Quantitative Approach to Condensate from Residential Air Conditioners with Different Capacity as Drinking Water 2022-04-21T02:21:17+00:00 Kasni Sumeru sumeru@polban.ac.id Triaji Pangripto Pramudantoro tpp_ra@polban.ac.id Afif Miftakh Hafidzudin afif.miftakh.tptu417@polban.ac.id Mohamad Firdaus bin Sukri mohdfirdaus@utem.edu.my Cecep Sunardi csn_ra@polban.ac.id <p>During operation, the evaporator of split-type air conditioner (A/C) produces condensate water due to lower evaporator temperature, as compared to dew point temperature of the indoor air. So far, the condensate is considered unimportant and therefore being wasted. The split-type A/C is widely used in high-rise buildings, hotels, shopping areas, and even residential. The study aims to investigate the potential feasibility of the condensate to be used as for drinking water. Of course, treatment of the condensate is required before it can be used as a drinking water. The experiments were carried out in two cities, namely Bandung and Cirebon. Bandung represents a city with a cool climate, while Cirebon represents a city with a hot climate. The capacities of the A/C utilized in Bandung and Cirebon are 0.5 HP and 1 HP, respectively. The quantities of the condensate from the A/C were collected for 24 for hours. The quality of the condensate was benchmarked with guidelines/standard from PERMENKES NO 492/MENKES/PER/IV/2010. The benchmarking process involved testing and evaluation of 22 significant parameters related to water quality for drinking purpose. By utilizing waste condensate water, it is predicted that it can be a vital alternative of potable water in the future</p> 2022-04-17T03:34:44+00:00 ##submission.copyrightStatement## https://ijatr.polban.ac.id/ijatr/article/view/54 Simulation of IoT-Based Temperature and Humidity Conditioning System in Screen House 2022-04-21T02:21:17+00:00 Wirenda Sekar Ayu wirendasekar@polban.ac.id Bowo Yuli Prasetyo bowo_yuli@polban.ac.id <p>Nowadays, various problems have arisen in agricultural sector. One of which is the decline in productivity of farmers' crops up to 40% which is caused by non-optimal environmental conditions during the plant growth process. This is certainly a challenge for Indonesian farmers to be able to continue in supplying the country's needs for high quality agricultural products. The challenges faced by Indonesian farmers do not only come from the environmental conditions of plant growth, but the development of Industry 4.0 technology also plays an important role in the development of agricultural sector in Indonesia. In order to adapt to these technological changes, a solution is needed in the form of an integrated agricultural equipment with Industry 4.0 technologies such as the Internet of Things (IoT). One of which is creating an IoT-based control and monitoring system that will be applied to the screen house. In this research, an IoT-based temperature and humidity conditioning system was designed in the screen house. The system design is modeled and tested through simulation on Vensim software. Based on the simulation results of system design, the screen house internal temperature can be controlled or maintained in the optimal temperature range for tomato plant growth, which is 18–24<sup>o</sup>C with an offside value of ±0.5<sup>o</sup>C. The heating capacity or heating rate required in this system is 10<sup>o</sup>C/hour. The cooling capacity or cooling rate generated to compensate the influence of external temperature and heating effect on the screen house internal temperature is 1–1.8<sup>o</sup>C/hour. The heating and cooling rate values generated in this research are still need to be converted into fan and pump PWM values to be implemented in a fan- pad evaporative cooling system.</p> 2022-04-17T03:22:53+00:00 ##submission.copyrightStatement## https://ijatr.polban.ac.id/ijatr/article/view/62 Using mathematical model to design and sizing of pumping water system 2022-04-21T02:21:17+00:00 Luqman Raji rajiluqman2020@gmail.com Y Gajawa y.gajawa@gmail.c.om Aji A. B. Aji.A.B@gmail.com <p>The role of the pump in any pumping system is to provide sufficient pressure to overcome the operating pressure of the system in order to move fluid (water) at a required flow rate to the user. In this study, a mathematics model was used for design in order to provide adequate water supply to every quarter in Federal Polytechnic Mubi, Adamawa state Nigeria. According to the research, the proposed water supply requires a 1360W power pump, a 1500W inverter, and a 1500W solar panel. Because the suggested water supply is based on renewable energy, the study found that it can be used at Federal Polytechnic Mubi to increase their supply for human use. As a result, the FPM management has reduced greenhouse gas emissions.</p> 2022-04-17T03:37:22+00:00 ##submission.copyrightStatement##