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All Journal JiTEKH (Jurnal Ilmiah Teknologi Harapan) Journal La Multiapp Jurnal Ilmiah MADIYA: Masyarakat Mandiri Berkarya
Zumhari, Zumhari
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Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Environmental Science Mechanical Engineering Social Sciences

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PEMANFAATAN KOMPRESOR UDARA UNTUK MENINGKATKAN PELAYANAN BAGI PENGGUNA JASA BENGKEL SEPEDA MOTOR Zumhari, Zumhari; Asriyati, Asriyati; Suherman, Suherman; Sari, Dewi Comala; Safitri, Habibi Ramdani
Jurnal Ilmiah Madiya (Masyarakat Mandiri Berkarya) Vol. 5 No. 2 (2024): Edisi November 2024
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/madiya.v5i2.2631

Abstract

The community service activity carried out in Sumber Mulyorejo Village, Binjai Timur Subdistrict, for business partners in the field of motorcycle repair technology is a collaboration between higher education institutions and the community to fulfill the requirements of the Tri Dharma Perguruan Tinggi (Three Pillars of Higher Education). This collaboration emphasizes technology transfer and ensures the availability of technology needed by the community. As part of this planned community service initiative, the technology transfer from the proposing team to the business partners also includes providing and enhancing the technical equipment already owned by the partners. In running their motorcycle repair businesses, the partners face challenges due to the limited equipment they possess. The incompleteness and simplicity of the technical equipment owned by the partners result in slow and low-quality completion of work for their customers. Several complaints have been raised by customers with the partner regarding the slow completion of work. As a result, the number of customers has decreased. If this situation continues to recur, there is a possibility that the partner may lose customers entirely, which would inevitably reduce the partner's income. To address this detrimental situation, improving and adding technical equipment have become necessary and an urgent priority. The outcomes of this community service activity include an increase in the partner's income in the workshop sector and the addition of new equipment, namely one air compressor unit and tools supporting motorcycle service and repair work.
Thermal Effectiveness Analysis of Lube Oil Cooler Fan with Capacity of 40.332 Kg/S with Pressure of 5 Bar Pratama, Angga Bahri; Razak, Abdul; Sahat, Sahat; Manurung, Nelson; Ginting, Berta Br; Sinaga, Franklin Taruyun Hudeardo; Zumhari, Zumhari
Journal La Multiapp Vol. 7 No. 3 (2026): Journal La Multiapp
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallamultiapp.v7i3.841

Abstract

The Lube Oil Cooler Fan is an essential component in the lubrication system of a gas turbine because it maintains lubricating oil temperature within a safe operating range. This study aims to analyze the thermal performance and effectiveness of the Lube Oil Cooler Fan on Gas Turbine GT 1.1 at PT XYZ. The study employed a descriptive quantitative approach using field observation data and heat transfer calculations. The analysis was conducted through the Log Mean Temperature Difference method and heat exchanger effectiveness approach by considering fluid temperature changes, mass flow rates, thermophysical properties, flow characteristics, convective heat transfer coefficients, overall heat transfer coefficient, heat transfer rate, and thermal effectiveness. The results show that the lubricating oil temperature decreased from 61°C to 49°C, while the cooling air temperature increased from 32°C to 53.5°C. The tube side heat transfer coefficient was 40.71 W/m²°C, the shell side heat transfer coefficient was 308 W/m²°C, and the overall heat transfer coefficient was 30.61 W/m²°C. The calculated heat transfer rate was 992.57 W or approximately 0.993 kW. The lubricating oil was identified as the minimum heat capacity fluid, with a heat capacity rate of 33.13 kW/°C. The thermal effectiveness of the Lube Oil Cooler Fan was 41.4%, indicating that the cooler was able to perform its cooling function, although its performance remained moderate. Routine monitoring, stable airflow control, and periodic cleaning are recommended to improve thermal performance.
Sistem Monitoring IoT untuk Evaluasi Kebersihan Alat Konverter pada Insinerator Sampah Zumhari, Zumhari; Yuvina, Yuvina; Damayanti, Fera; Nasution, Tuti Adi Tama; Mardiana, Mardiana
JiTEKH Vol. 14 No. 1 (2026): March 2026
Publisher : Universitas Harapan Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35447/jitekh.v14i1.1238

Abstract

The issue of waste in major cities is one of the biggest challenges that needs to be addressed. To tackle this, an Internet of Things (IoT)-based clean urban system is designed to reduce waste volume, improve environmental quality, and generate renewable electricity. The method used consists of several main components. First, smart bins equipped with sensors identify the amount and type of waste, with data sent to an IoT platform for analysis. Second, an incinerator is used to burn waste and produce thermal energy, which is then converted into electrical energy by a thermoelectric generator. Third, the IoT platform manages data from thermocouple and MQ-2 sensors to monitor the combustion process and air quality. This platform also provides system performance information to users. The implementation of this system is expected to significantly reduce urban waste volume, enhance environmental quality, and generate renewable energy. Furthermore, this system has the potential to improve waste management efficiency and public awareness.
Co-Authors Abdul Razak Angga Bahri Pratama Asriyati Asriyati, Asriyati Damayanti, Fera Franklin Taruyun Hudeardo Sinaga Ginting, Berta Br Mardiana Mardiana Nasution, Tuti Adi Tama Nelson Manurung, Nelson Safitri, Habibi Ramdani Sahat Sahat Sari, Dewi Comala Suherman, Suherman Yuvina, Yuvina