Articles
<![CDATA[KEMAJUAN DARI PENGGUNAAN SISTEM SOLAR DESICCANT COOLING UNTUK BANGUNAN DI IKLIM TROPIS ]]>
<![CDATA[Arfidian Rachman]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 1, No 1 (2011) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[Solar desiccant cooling (SDC) memiliki potensi penghematan konsumsi energi primer sepanjang tahun dibandingkan dengan sistem penyegaran udara konvensional untuk aplikasi di iklim panas dan lembab(tropis). Evaluasi kinerja dari sistem solar desiccant cooling ini (SDC) ini dilakukan untuk bangunan pada kondisi iklim dan pembebanan yang berbeda. Alternatif pengunaan sistem penyegaran ini secara teknis layak di gunakan, dengan pnghematan hingga 35,2% dari konsumsi energi primer sepanjang tahun di bandingkan dengan sistem penyegaranan udara konvensional. Alternative dari penggunaan solar desiccant cooling ini rekomendasi dari penyegaranan udara dengan kompresi uap-konvensional dengan desain sistem udara penuh. Sistem solar desiccant cooling ini menggunakan pengumpul radiasi matahari dengan menggunakan tabung kaca hampa udara, tipe ini di pilih karena lebih ekonomis dibandingkan dengan panel PV atau PVT.]]>
<![CDATA[Exergy Study of Steam Flash Cycle & Kalina Cycle at Waste Heat Recovery Power Generation Operation System ]]>
<![CDATA[Arfidian Rachman]]>;
<![CDATA[Benny Arianto]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 10, No 1 (2020) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[Waste Heat from cement kiln factories has begun developed to power generation in the world. Waste Heat Recovery Power Generation (WHRPG) is the one of power generation with use hot gas from cement kiln to increase water temperature in After Quenching Cooler (AQC) Preheater (SP) Boiler, and change water into superheated steam stage. Superheated Steam will delivery in to turbine and drive the generator. The quality of hot gasses will affect the turbine work and power generator. The temperature of hot gasses frequently at below 340°C. It will cause turbine not work in optimally condition. This research done for study using ammonia – water on kalina cycle at WHRPG to resolve the problem in WHRPG. From this study found that value of total exergy destruction at Steam Flash Cycle is 19,97 MW with power generator 7,011 MW. While at kalina cycle, total exergy destruction the kalina cycle is 18,33 MW with power generator at 8,459 MW.]]>
<![CDATA[A Mathematical Model of Desiccant Wheel in Desiccant Cooling ]]>
<![CDATA[Arfidian Rachman]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 10, No 1 (2020) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[The desiccant wheel performance of desiccant cooling system components is very important whose function is to regulate air humidity levels as well as to the capability, size and cost of the entire system. Mathematical models for predicting the performance of desiccant wheels in the development of mathematical models is one of the effective methods for analyzing the performance of wheel this moisture-reducing. This mathematical model can also be used in guiding system operation, delivering experimental results and automation in designing this cooling system. The purpose of this paper is to provide an overview of efforts to mathematically model the process of heat transfer and mass transfer that occurs in the moisture-reducing wheel. The desiccant wheel model built here is a gas and solid system including basic principles, heat and mass transfer mechanism and model building. The model is based on ideal assumptions, equations, additional conditions and the method of solution and also the main results. The gas-solid model is a more precise and more complex model than the other models. From these results the evolutionary process of the mathematical model is obtained and the aspects of calculation of pressure loss, air leakage, and optimal rotation speed of the drying wheel / dehumification.]]>
<![CDATA[Improved Performance of the Vapor Compression Cooling System Using A Combination of Condensers-Evaporative Cooling ]]>
<![CDATA[Arfidian Rachman]]>;
<![CDATA[Sulaeman Sulaeman]]>;
<![CDATA[Syafrul Hadi]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 8, No 1 (2018) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[Energy use is a major problem in the vapor compression air cooling system, especially in areas with very hot weather conditions. In hot weather conditions, the performance of the system has decreased dramatically and electricity consumption has increased significantly. Combined Condensor with evaporative cooling will increase the heat removal process by using an evaporative cooling effect that will increase the efficiency of energy use. This paper presents the study of the use of evaporative cooling and condenser. This paper mainly calculated energy consumption in steam compression cooling systems and related problems. From the results of this study, the use of condensers with evaporative cooling, power consumption can be reduced to 46% and performance coefficient (COP) can be increased by about 12%, with 1,2 kW cooling capacity.]]>
<![CDATA[Improved Performance Cooling System with Integrated Condenser and Direct Evaporator Cooling ]]>
<![CDATA[Arfidian Rachman]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 9, No 1 (2019) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[For areas with very hot and humid weather conditions increased latent and sensible loads are a major problem in cooling systems that will increase compressor work so that electricity consumption will also increase. Combined Condenser with direct evaporative cooling will increase the heat removal process by using an evaporative cooler effect that will increase the efficiency of energy use. This paper presents the study of the use of evaporative cooling and condenser. This paper mainly calculated energy consumption in steam compression cooling systems and related problems. From the results of this study, the use of condensers with evaporative cooling, power consumption can be reduced to 46% and performance of coefficient (COP) can be increased by about 12%, with 1,2 kW cooling capacity.]]>
<![CDATA[KAJIAN EKSPERIMEN SISTEM PENGKONDISIAN UDARA MENGGUNAKAN TENAGA SURYA UNTUK IKLIM TROPIS ]]>
<![CDATA[Arfidian Rachman]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 5, No 1 (2015) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[Penelitian ini adalah menghasilkan suatu sistem pengkondisian udara yang hemat energi dan ramah lingkungan, karena menggunakan tenaga matahari sebagai sumber energi termal dan tidak menggunakan refrigerant sebagai fluida kerjanya. Sistem ini dirancang untuk memenuhi kebutuhan ruang pendinginan di bagunan, di mana sistem ini menghasilkan penghematan energi mencapai 80% dibandingkan sistem pengkondisian udara pemampatan gas. Kelebihan sistem ini adalah dapat mengontrol kelembabapan dan suhu secara terpisah. Analisis ekperimental dan simulasi untuk masing-masing komponen dikhususkan pada variasi kinerja sebagai fungsi dari laju aliran udara pada bagian proses dan regenerasi, didapatkan efisiensi kolektor matahari adalah 70% pada intensitas matahari adalah 0,606 kW/m2, pada kecepatan aliran air 4.5 m/s dengan debit aliran air 10 liter/menit. Untuk bagian sistem pengkondisian udara menggunakan dua buah roda, yaitu roda dehumidifikasi sebagai penurun kelembapan dan roda perpindahan panas sebagai penurun suhu. Kecepatan aliran udara proses dan udara regenerasi pada kedua-dua roda yaitu 3,77m/s dengan kapasitas 500m3/jam. Dari analisa eksperimen dan simulasi didapat efektifitas roda pengering dan roda perpindahan panas adalah 56% dan 72%. Hasil dari eksperimen didapatkan nilai COP sistem ini adalah 0,3, dengan kapasitas pendinginan 5,6kW. Dengan rasio pengembalian ekonomi 5 tahun.]]>
<![CDATA[Design and Performance Horizontal Axis Wind Turbine Taper Type ]]>
<![CDATA[Arfidian Rachman]]>;
<![CDATA[Putri Pratiwi]]>;
<![CDATA[Lucky Ashari]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 9, No 2 (2019) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[The potential of wind energy in Indonesia is sufficient for the development of renewable energy based on wind turbine, because the average wind speed ranges from 3-12 m / s. The wind that blows is dominated by West, Southwest, and Northwest winds with speeds sometimes reaching 2.5 m / s to 20 m / s. The designed wind turbine is a Taper type blade where the comparison of the tip chord to the base is 1.3: 1, with a blade length of 1 m. Where the blades are designed to be able to spin in high-speed winds and to maximize the efficiency that can be obtained. The design result that the highest peak is 59% at TSR 7 and the blades start to spin in winds of 8.7 m / s and at winds of 12 m / s the power produced reaches 3255 watts.]]>
<![CDATA[Overview of Variable Refrigerant Flow Air Conditioning System ]]>
<![CDATA[Arfidian Rachman]]>
<![CDATA[ Jurnal Teknik Mesin Vol 11 No 1 (2021): Jurnal Teknik Mesin Vol.11 No.1 April 2021 ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP ]]>
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DOI: 10.21063/jtm.2021.v11.i1.37-46
<![CDATA[Variable refrigerant flow air-conditioning (VRF) systems are important and widely used in building energy systems around the world. The system is gradually gaining popularity in commercial and residential buildings due to its satisfactory partial load performance, flexible control, ease of installation and maintenance. Variable refrigerant flow air-conditioning (VRF) is a multi-split Heating, Ventilation and Air Conditioning (HVAC) system that controls refrigerant flow to control separate zones for the needs of residential consumers and commercial buildings. The objective of this review is to identify VRF systems that affect various aspects of operation and performance. Special VRF components regulate refrigerant volume control for system performance and reliability. The findings show that specific testing through different compressor settings, electronic expansion valve (EEV) position, and airflow operation affects performance, thermal comfort and potential energy savings. The main conclusions drawn from this detailed review provide a comprehensive overview of VRF and inspire new insights and viable solutions for relevant researchers, product developers, practitioners and policy makers in this field. Previous experimental investigations will be more helpful in the future direction of progress as the development of an extensive VRF system is still in the main stages.]]>
<![CDATA[KEMAJUAN DARI PENGGUNAAN SISTEM SOLAR DESICCANT COOLING UNTUK BANGUNAN DI IKLIM TROPIS ]]>
<![CDATA[Arfidian Rachman]]>
<![CDATA[ Jurnal Teknik Mesin Vol 1 No 1 (2011): Jurnal Teknik Mesin Vol.1 No.1 October 2011 ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP ]]>
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DOI: 10.21063/jtm.2011.v1.i1.26-33
<![CDATA[Solar desiccant cooling (SDC) memiliki potensi penghematan konsumsi energi primer sepanjang tahun dibandingkan dengan sistem penyegaran udara konvensional untuk aplikasi di iklim panas dan lembab(tropis). Evaluasi kinerja dari sistem solar desiccant cooling ini (SDC) ini dilakukan untuk bangunan pada kondisi iklim dan pembebanan yang berbeda. Alternatif pengunaan sistem penyegaran ini secara teknis layak di gunakan, dengan pnghematan hingga 35,2% dari konsumsi energi primer sepanjang tahun di bandingkan dengan sistem penyegaranan udara konvensional. Alternative dari penggunaan solar desiccant cooling ini rekomendasi dari penyegaranan udara dengan kompresi uap-konvensional dengan desain sistem udara penuh. Sistem solar desiccant cooling ini menggunakan pengumpul radiasi matahari dengan menggunakan tabung kaca hampa udara, tipe ini di pilih karena lebih ekonomis dibandingkan dengan panel PV atau PVT.]]>
<![CDATA[Exergy Study of Steam Flash Cycle & Kalina Cycle at Waste Heat Recovery Power Generation Operation System ]]>
<![CDATA[Arfidian Rachman]]>;
<![CDATA[Benny Arianto]]>
<![CDATA[ Jurnal Teknik Mesin Vol 10 No 1 (2020): Jurnal Teknik Mesin Vol.10 No.1 April 2020 ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP ]]>
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DOI: 10.21063/jtm.2020.v10.i1.16-32
<![CDATA[Waste Heat from cement kiln factories has begun developed to power generation in the world. Waste Heat Recovery Power Generation (WHRPG) is the one of power generation with use hot gas from cement kiln to increase water temperature in After Quenching Cooler (AQC) & Preheater (SP) Boiler, and change water into superheated steam stage. Superheated Steam will delivery in to turbine and drive the generator. The quality of hot gasses will affect the turbine work and power generator. The temperature of hot gasses frequently at below 340°C. It will cause turbine not work in optimally condition. This research done for study using ammonia – water on kalina cycle at WHRPG to resolve the problem in WHRPG. From this study found that value of total exergy destruction at Steam Flash Cycle is 19,97 MW with power generator 7,011 MW. While at kalina cycle, total exergy destruction the kalina cycle is 18,33 MW with power generator at 8,459 MW.]]>
