Budi Waluyo

• Doctor of Engineering
• Lecturer at Muhammadiyah University of Magelang

This study presents the analysis of thermodynamic behavior and energy efficiency of a vapor compression refrigeration system with two types of condensers: air-cooled (ACC) and water-cooled (WCC). The main objective is to assess the system performance by comparing the Coefficient of Performance (COP) and Energy Efficiency Ratio (EER) under both cond...

The Sustainable Development Goals (SDGs), established by the United Nations in 2015, are a comprehensive global framework that addresses social, economic, and environmental challenges through sustainable development. This study examines the role of universities, specifically focusing on the Department of Mechanical Engineering at Universitas Muhamm...

Kelancaran proses pengolahan air di PDAM seringkali terhambat oleh gangguan pada finish water pump yang berperan penting dalam operasional Water Treatment Plant (WTP), ketika mengalami kerusakan komponen mesin ini seringkali memerlukan perbaikan yang signifikan, mengakibatkan dampak yang merugikan bagi perusahaan. Waktu yang terbuang akibat breakdo...

Now days, the use of fossil fuels is still the most widely used energy source. This condition causes its availability to start depleting and it has an impact on worsening air quality. Biofuel can improve air problems when used as a substitute or mixture of fossil fuels. Methanol is a potential candidate because it is cheap and easy to produce. The...

Waste Motor Oil (WMO) is a hazardous waste material with the potential to contaminate water, soil, and the atmosphere. The management and engineering of WMO have become imperative in modern society for both resource utilization and environmental protection. Maximizing the energy content of WMO poses a significant challenge for researchers, to solve...

An increase in the number of vehicles today will result in an increase in fuel oil consumption and emission pollution. Therefore, it is necessary to optimize for fuel oil economy and emission reduction by improving engine performance. Improving engine performance can be done through several factors, including; with compression ratio, volumetric eff...

The droplet evaporation characteristics of crude vegetable oils, including crude coconut oil (CCO), crude palm oil (CPO), crude jathropa oil (CJO), and crude sunflower oil (CSFO) mixed with and without nanocarbon (fullerene C60) were investigated. The nanocarbon was produced from the waste biomass-based coconut shell. The droplet evaporation experi...

This paper reports on the experimental investigation of the cooling effect harvested in liquefied petroleum gas (LPG)-fueled vehicles. The heat required to vaporize the LPG in a vaporizer, which was originally transferred by the engine coolant, was replaced by air flow. The fuel line was modified by adding an evaporator equipped with an expansion v...

This article is the result of implementing the CSR program of PT PLN Magelang Regency branch to help solve problems in the Rahayu Manunggal Women Farmers Group (KWT). High production costs and low profits are obstacles faced by KWT Rahayu Manunggal. This problem is caused by the production process of making brown sugar which uses quite a lot of ene...

This paper reports on the experimental investigation of the cooling effect harvested in liquefied petroleum gas (LPG)-fueled vehicles. The heat required to vaporize the LPG in a vaporizer, which was originally transferred by the engine coolant, was replaced by air flow. The fuel line was modified by adding an evaporator equipped with an expansion v...

In recent years, one of the most logical efforts made to reduce the dependence on fossil energy sources is the use of a gasoline-methanol fuel blend. However, the problem in using a gasoline-methanol blend as fuel is that the methanol will eventually separate itself from the gasoline unless they are properly blended together, this is because methan...

The high monthly costs associated with the use of electrical energy for the production of dairy cowsheds at the KTT Sumber Sari, as well as the problem of PLN blackouts, have a negative impact on the smooth production process. Meanwhile, KTT Sumber Sari already has a 40 m3 biodigester that has only been used for household cooking. Problem identific...

This study reports an experimental investigation of cooling power harvesting in LPG-fueled vehicles. The heat of vaporization for LPG in the vaporizer which is initially transferred from the engine coolant is modified by circulating low-temperature water by adding a chiller which placed on a three-passenger pick-up car. Low-temperature water is cir...

Damage to the car compartment, thermal discomfort, fuel wastage, health risks, and the death threat of passengers/pets in the cabin due to high temperatures in cars parked under the sun is an interesting discussion. Therefore, this research examines the characteristics of solar cells-based cabin cooler system on car parked under the sun. Four ST32M...

Highlights: • The high viscosity of waste cooking oil (WCO) was converted to biodiesel (WCOBD) through a transesterification process • Fuel properties are measured and observed within the scope of ASTM standards (ASTM D6751) and fatty acid profiles captured by chromatography • RSM optimization and ANN modeling for biodiesel production have been tes...

The emergence of Corona Virus Disease 19 (Covid-19) required a new method to control its spread. During this time, controlling COVID-19 was carried out by implementation of a sterilization chamber using a liquid-based disinfectant. However, the use of liquid-based disinfectants has been evaluated to be less effective because it allows disrupting th...

The advantages of methanol as a fuel for Internal Combustion (IC) engines includes the latent heat of evaporation that increase volumetric efficiency, high flame speed for increasing the engine power, low combustion temperature, and high hydrogen to carbon ratio which reduces harmful exhaust gases. One of the most critical aspects of gasoline-metha...

It has been a year after the announcement of Covid-19 outbreak in Wuhan. Activity restriction, implementation of health protocol, and lock-down are enforced to cutoff the spread of this virus. However, in the uncertainty towards a new normal, the mobility of people continues for various purposes. A rapid medical checkup at the airport or at railway...

The enactment of national standards of higher education in Indonesia requires vocational higher education (VHE) to carry out curriculum improvements. Unfortunately, curriculum changes which are routine activities often leave new problems, such as differences in understanding how to reconstruct the higher education curriculum that is still very dive...

The ½ cycle refrigeration system on LPG fueled vehicles has a significant cooling effect. However, the cooling is very dependent on the heat exchange process in the evaporator. Therefore, this paper analyses the deviation of the actual cooling curve from the ideal scenario carried out on a laboratory scale. The analytical method used is the calcula...

This article presents an overview of the technology status and market trends of LPG-fueled vehicles through the literature approach to re-evaluate their future. In the review, it is discovered that LPG vehicles are globally increasing, though with a concentration in some countries. Of the 25 countries included in the World LPG Association (WLPGA) a...

The ½ cycle refrigeration system on LPG fueled vehicles has a significant cooling effect. However, the cooling is very dependent on the heat exchange process in the evaporator. Therefore, this paper analyses the deviation of the actual cooling curve from the ideal scenario carried out on a laboratory scale. The analytical method used is the calcula...

Solar radiation causes excessive temperatures in the cabin of a car parked in direct sunlight. Excess temperatures can accelerate damage to interior compartments, increase the evaporation of benzene from interior components, and increase the AC load when the vehicle starts. Therefore, this article presents the results of an investigation on the ene...

Consumer interest in privately managed urban transport services in Indonesia are showing a declining trend. On the other hand, the presence of Transportation on Demand (ToD) based on Internet of Things (IoT) has attracted the majority of conventional fleet customers which contribute to the declining trend of occupancy. Therefore, this study aims to...

This study aims to disclose the role of molecular interactions of iso-octane ethanol blend during droplet combustion. The iso-octane ethanol composition which has the potential to form molecular clusters was analyzed using integer interaction modeling with mole ratio. Comparison of mole-based compositions was converted to a volume base to verify em...

This research was conducted to investigate the performance of vapor compression refrigeration systems with Musicool 134 refrigerant. The scope of this study was to compare the performance of double expansion valves installed parallel to the temperature expansion valve (TEV). The temperature and pressure of the refrigerant at the variable cooling lo...

This paper presents the development of a smart brake controller (SBC) that applied to passenger cars to reduce accidents while stopped on a hill road. Crash accidents often occur due to the lack of driver skill or negligence in holding the brake pedal. The smart brake controller works by electro-mechanically to lock the brake system even though the...

This article aims to reveal the role of ethanol as a cosolvent in maintaining the stability of a gasoline methanol blend. Polar methanol was mixed with polar gasoline with a fraction of 30, 50 and 70% v/v at room temperature and atmospheric pressure. Ethanol titration in gasoline methanol mixtures was conducted to determine the ethanol content need...

This paper presents a simulation study on the utilization of LPG/Vi-Gas for public transport in Magelang City. Estimates of CO 2 reduction per year are calculated theoretically and based on data from NEDC experiences. Both of these methods show positive results, reducing CO 2 by theoretical calculations and comparing with NEDC experiences are 13.6...

Methanol has a strong potential to be used as a substitution for fossil fuel due to its several advantages such as the enthalpy of evaporation, high octane numbers and high oxygen content. However, unlike the non-polar gasoline, it is polar and very miscible with water and this leads to the phase separation of the gasoline-methanol blend. Therefore...

Alternative fuels have become an effective solution to reduce the impact of road transport on the environment. On the other hand, the growing uses of airconditioning (AC) have contributed to worsening the fuel economy of passenger vehicles. Liquid petroleum gas (LPG), if injected in the gaseous phase to power SI engines, may allow reducing the fuel...

This article presents an analysis of the development of fuel system technology in Liquified Petroleum Gas (LPG) vehicles compared to the development of a fuel system in a gasoline engine. We found that over the past 100 years of using LPG as an alternative fuel, there have been changes in LPG kits for six generations. The first and second-generatio...

Engine torque and power are one of the problems in LPG applications for vehicles with first-generation converter kits. Therefore, this paper presents the results of the development of a mixer prototype to be applied to LPG fueled vehicles with first-generation converter kits (converters and mixers). A series of work is done beginning from design, p...

In LPG-fuelled vehicles, there is a potential cooling from LPG evaporation in the fuel line. Cooling power is obtained without reducing the caloric value of the fuel supplied to the engine. Thus, LPG functions like a refrigerant before it is burned in the combustion chamber. Consequently, there is a change in fuel efficiency. Therefore, this paper...

In LPG-fuelled vehicles, there is a potential cooling from LPG evaporation in the fuel line. Cooling power is obtained without reducing the caloric value of the fuel supplied to the engine. Thus, LPG functions like a refrigerant before it is burned in the combustion chamber. Consequently, there is a change in fuel efficiency. Therefore, this paper...

This paper presents a lab-scale experiment on the prototype of the ½ cycle refrigeration system of an LPG-fueled vehicle. LPG before being sent to the engine is used as a heat absorbing medium. The experiment was carried out at 0.15 MPa evaporation pressure and 1-6 g/s of LPG flow rate which representing of Light Duty Vehicle (LDV) fuel consumption...

Maintaining the quality of food products from an agricultural land and farms to the final consumer is usually conducted through the car-cooling box. However, as long as the refrigeration equipment takes energy from the car engine, it will significantly increase fuel consumption. Therefore, this paper presents the concept of 1/2 cycle refrigeration...

Datsun Go merupakan salah satu mobil Low Cost Gren Car (LCGC) yang beredar di Indonesuia. Mobil ini sudah dilengkapi dengan sistem AVG (Average) atau pembacaan rata-rata bahan bakar yang dapat dilihat dengan mudah pada display. Namun demikian laporan terkait konsumsi bahan bakar yang disampaikan pengguna kendaraan sangat bevariasi. Tujuan studi ini...

In the past decade, the general method for measuring the performance of research and scientific publications in a Study Program at a Higher Education is by the Rough Value (Nilai Kasar, NK) calculated per three years. This value is derived from the accreditation instrument. In fact, the calculation of the performance of research and scientific publ...

Puji syukur dipanjatkan ke hadirat Allah SWT, atas nikmat dan karuniaNya hingga penyusunan kurikulum berdasarkan Permenristekdikti no.44 Tahun 2015 Program Studi Mesin Otomotif Universitas Muhammadiyah Magelang ini dapat diselesaikan. Kegiatan ini merupakan salah satu implementasi “Hibah Bantuan Implementasi Kurikulum Pendidikan Tinggi Vokasi” yang...

This paper presents a simulation of the potential cooling effect that can be harvested from the Liquefied Petroleum Gas (LPG) phase change process on the fuel line before being supplied to the combustion chamber. The composition of LPG used was obtained from the average test result of the samples taken periodically in the fuel line with a special g...

This paper is part of the project of hybrid A/C system development on LPG-fueled vehicles which is conducted at the Automotive Laboratory of Universitas Muhammadiyah Magelang.

This paper is part of the project of hybrid A/C system development on LPG-fueled vehicles which is conducted at the Automotive Laboratory of Universitas Muhammadiyah Magelang

LPG sebagai bahan bakar alternatif yang sangat menjanjikan, banyak digunakan disejumlah negara maju. Penggunaan LPG tersebut karena memiliki properties yang baik seperti nilai kalor, nilai oktan yang tinggi serta emisi yang lebih ramah lingkungan. Makalah ini mempelajari pengaruh tekanan kompresi terhadap emisi gas buang untuk kendaraan motor bensi...

Kendaraan LPG, Komposisi LPG, Wobbe Index Energy Delivery Artikel ini menyajikan sebuah analisis numerik perubahan komposisi LPG terhadap energy delivery pada kendaraan berbahan bakar LPG berpenggerak Spark Ignition (S.I.). Perubahan komposisi LPG terhadap pengiriman energy content bahan bakar ke ruang bakar dinilai menggunakan Wobbe Index ! ". Per...

Generally, parameters for measuring the performance of air conditioning system is COP. In a thermodynamic analysis of air conditioning system, the losses that occur in the expansion valve is not considerable. In reality, the ice formation layer phenomenon is formed around the expansion valve during air conditioning system operation. Therefore, this...

In the first generation of LPG kit, are called Converter and Mixer (CM), the engine power is influenced strongly by the size of mixer venturi, but this case has not been widely discussed. LPG has lower carbon content than gasoline, so it requires less air to burn. Theoretically, the amount of air to burn LPG is 46% lower than gasoline. However, in...

Liquefied Petroleum Gas (LPG) is an alternative fuel in spark ignited premix combustion engine and emissions from LPG engines are lower than those in gasoline engines. This article presents a novel method ofchanging the ignition curve in an LPG/Gasoline bi-fuel engines which still use the converter and mixer models. The goal of this research was to...

Salah satu kelemahan converter kits model vaporizer-mixer adalah belum dilengkapi power system. Pada saat beban berat (bukaan throttle valve besar dan putaran mesin rendah), suplai LPG menjadi sangat berkurang sehingga output yang dihasilkan rendah. Tujuan dari penelitian ini adalah mengembangkan model mixer yang dinamis, dengan ukuran venturi yang...

Proses pembentukan campuran LPG-udara pada converter kits konvensional dilakukan pada komponen mixer. Sebuah mixer dituntut memiliki venturi yang tepat untuk menjaga efisiensi volumetrik dan memberikan sinyal vakum yang tepat ke vaporizer pada setiap kondisi kerja mesin. Inovasi bentuk dan ukuran venturi mixer yang sudah ada memberikan campuran yan...

The main problem SI engine with a positive crankcase ventilation system (PCV) is the formation of carbon crust due to the evaporation of the lubricating oil. This condition will cause engine knocking as well as performance decreases.This problem can be reduced by adding oil catch tank between the PCV valve and the induction chamber. This research a...