Analisis Numerik Pengaruh Modifikasi Desain Saluran HVAC Berbasis Computational Fluid Dynamics (CFD) pada Kereta Bandara Adi Soemarmo

Fawziya, Nur Aziza (2023) Analisis Numerik Pengaruh Modifikasi Desain Saluran HVAC Berbasis Computational Fluid Dynamics (CFD) pada Kereta Bandara Adi Soemarmo. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Efisiensi energi dalam kereta sangat tergantung pada peran penting perangkat pendingin udara. Kenyamanan termal juga harus dicapai walaupun dilakukan suatu efisiensi energi. Suplai temperatur, tingkat kelembaban, dan sirkulasi udara yang optimal dari lingkungan sekitar menjadi faktor utama untuk mencapai kenyamanan termal. Berdasarkan perhitungan yang dilakukan, Kereta Rel Diesel Elektrik membutuhkan kapasitas pendinginan minimal sebesar 44273 W. Udara dari AC akan dialirkan ke dalam Kereta Rel Diesel Elektrik melalui saluran dual-ducting yang merupakan desain existing dan disimulasikan dengan variasi single duct tanpa pengarah dan single duct dengan 450 grill dengan variasi kecepatan 9 m/s dan 18 m/s sebagai simulasi satu evaporator dan dua evaporator. Hasil simulasi CFD menunjukkan bahwa berdasarkan hasil temperatur rata-rata, seluruh jenis variasi saluran AC kereta memenuhi customer requirement. Namun, jika dilihat berdasarkan temperature minimum dan maksimum, hanya existing design, single duct design with 18 m/s inlet velocity, dan yang memenuhi standar atau tidak terlalu panas dan tidak terlalu dingin. Kemudian hasil lain yang dilihat adalah kecepatan udara pada area kepala. Pada hasil simulasi, dapat disimpulkan bahwa semua variasi desain single duct dengan kecepatan inlet 18 m/s ridak memenuhi standar atau melebihi 0,35 m/s. Untuk analisis RH, didapatkan semua jenis variasi saluran udara terasa nyaman, tidak terlalu kering atau terlalu lembab. Dari hasil analisis, dapat dipilih desain yang lebih baik dari existing design atau single duct design with 450 grill and 9 m/s inlet velocity yang keduanya sama-sama memenuhi standar temperature, kecepatan area kepala dan RH. Dari hasil tersebut, variasi yang paling memenuhi tujuan adalah Single duct design with 450 grill and 9 m/s inlet velocity dengan penggunaan 1 evaporator, temperatur rata-rata 23.460C, rata-rata kecepatan area kepala 0.27 m/s dan RH 58.99%.
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Energy efficiency in trains is highly dependent on the crucial role of air conditioning systems. Thermal comfort should also be achieved even when energy efficiency is pursued. The supply of optimal temperature, humidity levels, and air circulation from the surrounding environment are the key factors in achieving thermal comfort. Based on the conducted calculations, the Diesel Electric Railcar requires a minimum cooling capacity of 44273 W. The air from the AC will be supplied into the Diesel Electric Railcar through a dual-ducting system, which is the existing design, and simulated with variations of a single duct without a diffuser and a single duct with 450 grills at inlet velocities of 9 m/s and 18 m/s to simulate one evaporator and two evaporators, respectively. The results of the CFD simulations show that, based on the average temperature results, all variations of the train's AC ducts meet the customer requirements. However, when considering the minimum and maximum temperatures, only the existing design and the single duct design with 18 m/s inlet velocity meet the standard, providing comfort without being too hot or too cold. Another aspect observed is the airspeed at the head area. The simulation results indicate that all variations of single duct designs with 18 m/s inlet velocity do not meet the standard, as they exceed 0.35 m/s. Regarding the analysis of relative humidity (RH), all types of air duct variations provide comfort, avoiding excessive dryness or humidity. Based on the analysis, a better design can be selected compared to the existing design, which is the single duct design with 450 grills and 9 m/s inlet velocity, both of which meet the temperature, head area airspeed, and RH standards. Among these, the variation that best meets the objectives is the single duct design with 450 grills and 9 m/s inlet velocity, utilizing one evaporator, with an average temperature of 23.46°C, an average head area airspeed of 0.27 m/s, and RH of 58.99%.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Efisiensi Energi, Beban Pendinginan, CFD, Kereta Rel Diesel Elektrik, Sistem Pengkondisian Udara; Energy efficiency, Cooling Load, CFD, Diesel Electric Multiple Units, Air Conditioning System.
Subjects:	T Technology > T Technology (General) > T58.8 Productivity. Efficiency
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Nur Aziza Fawziya
Date Deposited:	11 Aug 2023 02:27
Last Modified:	23 Aug 2023 06:54
URI:	http://repository.its.ac.id/id/eprint/102499

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