Alfisyahrin Alfisyahrin’s scientific contributions

This community service program aims to provide a sustainable energy solution through the installation of a Solar Power Plant (PLTS) for the Refill Water Village-Owned Enterprise (BUMDes) in Nosar Village, Central Aceh Regency. The program addresses high operational costs caused by dependence on conventional electricity. The implementation method involves systematic stages, including needs identification, community organization, technical training, PLTS installation, and initial monitoring and evaluation. The results show significant positive impacts, including reduced operational costs for BUMDes, increased energy independence, and the transfer of technical knowledge to the community. BUMDes managers now possess the capability to operate and maintain the PLTS system independently, ensuring the program's sustainability over the long term. Activities such as training sessions, installations, and system trials were thoroughly documented to strengthen the program's validity. By adopting a participatory and community-empowerment approach, this program delivers immediate benefits to its partners while establishing a replicable model for renewable energy development in other regions. The program demonstrates that technological solutions can serve as catalysts for sustainable economic and social change.

Vertical farming uses soil-less methods, either indoors or outdoors, such as aeroponics or hydroponics. Indoor setups include insulated structures, lighting, cooling, and CO2 supply. Unlike outdoor systems that rely on sunlight, indoor farming uses a light-emitting diode (LED), incandescent, or fluorescent lamp. However, the constant light intensity of the lamps can inhibit plant growth, so a light regulation method is needed, one of which uses the PWM method. This study aims to compare the growth rate of microgreen Ipomoea reptans Poir using artificial lighting with and without regulated light intensity levels using the PWM method. PWM adjusts the brightness from 65% - 100% during the day. Analysis showed the linear effect of PWM on lamp voltage and power, also improving power efficiency from 16.3 W without PWM to 13.36 W in lamps with PWM. Comparative results showed that PWM control increased leaf area, limb length, leaf number, and wet weight in plants. Meanwhile, the root length of plants with PWM (9.68 cm) is shorter than plants without PWM (9.98 cm). Overall, plant growth with PWM control is better and more efficient.

The energy contained in the flow of water from the tank can be utilized as an additional source of electrical energy, namely by making a Pico Hydro Power Plant (PLTPh). However, the flow of water produced is certainly not strong enough because it only relies on the height of the tank laying, and the water discharge is not too large. So, the energy from sunlight is also utilized simultaneously and becomes a hybrid PV-hydro power plant (PLTH PV-hydro) with the aim of producing more optimal alternative energy. PLTH PV-Hydro is designed using a combination of 10 WP monocrystalline solar panels and two 10W DC generators coupled with turbines. The distance between the water drop point and the generator is designed to be as high as 2 meters and uses a 12 V, 5Ah VRLA battery as an electrical energy storage system. Based on the tests that have been carried out, the water discharge measurement results are 147.82 cm3/s = 147.82 × 10-3 l/s. The total power that PLTH can generate is 5.32 Watts using a 5-watt lamp load, and it can charge the battery within 6 hours.

Salah satu tulang punggung penyaluran energi listrik dari pusat pembangkit ke beban adalah jaringan listrik saluran udara tegangan tinggi (SUTT) dan saluran udara tegangan menengah (SUTM). Pembangunan jaringan listrik SUTT dan SUTM tidak luput dari dampak yang ditimbulkan kepada masyarakat akibat adanya paparan medan magnet yang ditimbulkan pada jaringan. Keberadaan pembangunan jaringan SUTT dan SUTM yang menghubungkan jaringan tersebut ke pembangkit listrik tenaga air PLTA Luteung 16 MW menimbulkan kekhawatiran dampak kesehatan kepada masyarakat. Oleh karena itu pelaksanaan pengabdian ini bertujuan untuk melihat potensi medan magnet yang ditimbulkan jaringan SUTT dan SUTM yang melintas di desa Luteung. Dari hasil pengukuran dibawah jaringan SUTT pada koordinat N 04o 52’ 02.49” dan E 96o 05’ 06.15” diperoleh kuat medan magnet sebesar 1.57 ?T dan jaringan SUTM pada koordinat N 04o 52’14.77” dan E 96o 05’ 11.34” diperoleh kuat medan magnet sebesar 0 ?T. Berdasarkan Standar Nasional Indonesia SNI 04-6950-2003 dapat disimpulkan kuat medan magnet yang terukur masih dibawah ambang batas 25 mT sehingga dapat dinyatakan bahwa medan magnet yang ditimbulkan pada SUTT dan SUTM yang melintas di desa Luteung masih dalam taraf aman bagi kesehatan masyarakat Luteung.

The need for electricity is one of the important things in the advancement of technology and human civilization in all respects. So it is necessary to regulate the use of electrical energy properly. Thus, it is very important for us to regulate the use of electrical energy in terms of power usage by electrical loads. One way is by saving electrical energy. One way to save electrical energy is an energy audit. The audit report is the result of the audit plan which will be processed and analyzed further in energy management (electrical energy regulation). From the results of the energy audit, energy flows will be known which will provide an overview of energy use, so that a strategic plan can be prepared to control energy use better and of course be more energy and cost efficient. One aspect of an energy audit is an audit of lighting energy (lighting in an area), so it is very important for us to control the use of electrical energy loads, in this research the kit only audits electrical energy, from the lighting energy of the Muara Batu sub-district office, North Aceh, so that the use of electrical energy becomes economical. Efficient use of energy can be a solution that will be very profitable in efforts to increase comfort. When an office is able to carry out energy efficiency, it means that the office has benefited from savings in energy consumption costs in a certain period, then from these results there are funds available that can be converted for other needs such as adding facilities or replacing equipment, which will indirectly increase employee comfort or the office.

Penelitian ini bertujuan untuk melakukan komputasi perhitungan aliran daya dengan beban tidak seimbang pada jaringan distribusi dengan sistem radial. Kondisi beban yang tidak seimbang muncul di sisi sekunder dari transformator distribusi dikarenakan permintaan daya pada masing masing phasa tidak sama besar, hal ini disebabkan karena pemakaian beban oleh tiap pelanggan berbeda. Studi aliran Beban yang tidak seimbang pada sistem tenaga listrik akan berpengaruh pada konsumen yaitu akan terjadi penurunan tegangan yang diterima oleh konsumen. Suatu studi aliran beban dengan kondisi beban tak seimbang akan memberikan gambaran tentang kondisi tegangan, sudut fasa, arus, daya dan rugirugi daya tiap-tiap bus pada masing-masing fasa A, B dan C. Perhitungan aliran beban tak seimbang dengan menggunakan software ETAP versi 16.0.0 dengan objek penelitian jaringan distribusi sistem radial penyulang Teubeng gardu hubung Sigli Kota. Dari hasil simulasi pada penyulang Teubeng diperoleh beban pada phasa A sebesar 0.473 MW dan 0.313 MVAr, beban pada phasa B sebesar 0.503 MW dan 0.320 MVAr, sedangkan beban pada phasa C sebesar 0.483 MW 0.343 MVAr. Penyulang Teubeng mengalami penurunan tegangan terbesar pada bus DLM005- 00S yaitu sebesar 6.1%, 5.8% dan 6.9% untuk masing masing phasa A, B dan C.