Quantum Teknika : Jurnal Teknik Mesin Terapan

Analisis Beban Pendinginan di Ruang Kelas F212 Institut Teknologi Sumatera

Daniel Manurung — 2025-04-30

Cooling load analysis in the classroom is carried out to support a comfortable learning process. Determining the cooling load is the foundation for planning an air conditioning system for a room. From the results of this determination, the capacity of the AC machine device used can be estimated. The method used in this solution is observation in the room, consisting of direct observation, measurement, and data recording. After obtaining all the data and calculating all possible heat dissipation factors, the total cooling load value in the room is 8584.34 W. The cooling capacity of the AC specifications in the room is 10040 W. Based on the results obtained, the total cooling load is lower than the cooling capacity of the AC in the room. So that the AC capacity in the room can provide comfort for the load in the room.

Pengaruh Plugging Terhadap Kinerja High Pressure Heater Tipe Shell and U-Tube Heat Exchanger (Studi Kasus: Unit 1- 4 di PT ABC)

Ghaffar Muhammad — 2025-04-30

High Pressure Heater (HPH) is an auxiliary component used to be required in regenerative steam power plants. The component is a heat exchanger utilized to enhance the power plant’s efficiency by enabling high pressure heating process for feedwater before entering the economizer in boiler using bled steam from turbine. The heat transfer effectiveness of HPH needs to be evaluated in relation to its operational conditions which are equipped with plugs to overcome leaks. This study aims to evaluate the impact of number of plugs on the high-pressure heater 5 in unit 1-4 PT ABC regarding heat transfer and its effectiveness. The Number of Transfer Unit (NTU) method along with Log Mean Temperature Difference (LMTD) method were employed in analysis of this research. The existing number of plugs are 4, 574, 100, and 111 in unit 1, 2, 3, and 4 respectively. The result shows that the heat transfer value for high pressure heaters in unit 1-4 PT ABC are 16.18 MW, 10.32 MW, 15.20 MW and 15.08 MW respectively, while the effectiveness value are 0.89, 0.74, 0.88, and 0.88. The study concludes that the effect of number of plugs in high-pressure heater regarding to heat transfer and effectiveness tends to be inversely linear.

Experimental Study of Drying Fruits and Vegetables Using The Freeze Drying Method With The Aim of Maintaining The Nutrition and Effectiveness of Processed Products

Mirza Yusuf — 2025-04-30

The potential of natural resources in tropical countries is very diverse. one of them is the abundant agricultural products. but there are some obstacles in the post-harvest cycle and the continuous availability when the harvest season ends. various methods of preserving agricultural products have been tested from conventional methods to advanced technology. one of the technologies for preserving agricultural products is freeze drying. various innovations continue to be tested until they get consistent results with good energy efficiency. This method was originally started in the pharmaceutical industry. Various treatments and flexible adaptations make this method penetrate the food industry to maintain the quality of food products. In the food industry, freeze drying is suitable for food products such as meat, fruits, grains, and vegetables. The advantage of freeze drying is that the food products produced do not change shape, form, texture, taste, and nutrition even though they have gone through the drying process. Of the various characteristics of fruits and vegetables have their own properties that can be changed with the temperature parameters applied in the freeze dryer method.

Pengaruh Penambahan Octane Booster Pada Bahan Bakar Terhadap Emisi Gas Buang Kendaraan Bermotor Empat Langkah 150cc

Khambali — 2025-04-30

The increasing demand for motorcycles in Indonesia has contributed to rising air pollution, particularly from exhaust emissions such as CO, HC, CO₂, and O₂. This study aims to investigate the effect of adding Octane Booster to Pertamax fuel on reducing harmful emissions from 150cc four-stroke motorcycle engines. The experimental method involved adding 0.2g, 0.5g, and 1g of Octane Booster per liter of fuel and testing engine performance at 2000, 2500, 3000, and 3500 rpm using an emission analyzer. The results showed that the addition of Octane Booster significantly reduced emission levels of CO, HC, CO₂, and O₂. The most effective reduction was observed with 1g Octane Booster at 3500 rpm, where CO was reduced by 31%, HC by 34%, CO₂ by 35%, and O₂ by 33% compared to standard fuel. The study concludes that Octane Booster not only improves combustion efficiency but also contributes to lowering emissions, thereby supporting efforts to mitigate global warming and air pollution caused by motorized vehicles.

Analisa Pengaruh Preheating dan Post Weld Quench terhadap Kekuatan dan Struktur Mikro Baja S45C dengan Pengelasan Shielded Metal Arc Welding

Arif Rachman — 2025-04-30

In many industrial contexts, steel is an everyday material. The technique of attaching metal parts using heat energy, known as welding, is something we encounter often; S45C is one of several steels that are used in machine construction. Protected metal arc welding is one type of welding that we come across frequently. Unwanted metallurgical changes, deformation, or residual stress in the base metal might occur as a consequence of uneven or excessive heating. A better method is to heat it up beforehand, often known as preheating, before welding. Determining the effect of preheating on the hardness of S45C steel during welding is one of the primary aims of this study. (2) to understand how changes in temperature and time affect the microstructure of S45C steel during welding and how it affects the final product. (3) ascertain the effect of temperature and duration on the resulting hardness of S45C steel welding. During the preheating procedure, the temperature is varied between 160 and 260 degrees Celsius, and the waiting periods are 7, 15, and 20 minutes, respectively. Hardness and microstructure testing, also known as metalografy, is performed on S45C steel after shielded metal arc welding (SMAW) to ascertain the degree of hardness and microstructure of the steel.

Analisis Variasi Waktu Perendaman Deep Cryogenic Treatment dan Aging terhadap Pengujian Kekerasan pada Aluminium 6061

Bimo Sakti Mahardika — 2025-04-30

Aluminum alloys are used more in industry due to its light weight, corrosion resistance, high strength, hardness, and recycling. This study examines the microstructure and hardness of 6061 aluminum alloy treated with Deep Cryogenic Treatment for 2, 12, 24, and 48 hours, followed by 1 hour of 1500C aging. Vickers hardness and microstructure testing will occur. The test results show that the hardness value has increased compared to the raw material. In the raw material variation, the hardness value is 53.4 HVN. The 2-hour immersion time variation experienced an increase in hardness value of 48.59% compared to the raw material. In the 12-hour soaking time variation, there was an increase of 43.9%. While the 24-hour and 48-hour variations also experienced an increase of 21.76% and 28.52% compared to the raw material. This is influenced by the microstructure that changes along with the variation in soaking time. Precipitates form due to the influence of deep cryogenic treatment which results in the hardness value of the 24-hour and 48-hour time variations decreasing compared to the 2-hour and 12-hour time variations.