Battery charging and discharging control of a hybrid energy system using microcontroller

This study aims to control charging and discharging the battery for hybrid energy systems. The control system works by selecting the right energy source to supply voltage to the load. And also this control system can regulate charging and discharging the battery automatically. The voltage source consists of two energy, namely from the battery and DC source. The control system that has been designed has the ability to choose the right DC source when the battery capacity is less than 80%. This system also has a good ability to choose a battery source when the battery reaches 100% capacity and the DC source has a voltage drop of more than 20%. This control system is equipped with excessive electric current protection so that the security level is high

Healthy Monitoring and Fault Detection Outer Race Bearing in Induction Motor Using Stator Current

This paper describes a new method for monitor and detection bearing damage on induction motor. This is considered important because induction motors have an important role in the industry which functions as the main engine in the production process. This paper focuses on bearing damage because this is the most common case. the case of damaged bearing is done by giving the outer race bearing hole in three cases, 1 mm hole, 2 mm hole and 3 mm hole. Bearing damage analysis is carried out through a stator current signal on an induction motor, then the Fast Fourier transform (FFT) algorithm is used to see the characteristics of the frequency spectrum that appears in the stator current signal. High frequency analysis is applied to get clear analysis results. The results obtained by analyzing the frequency spectrum in the stator current that bearing damage indicate there is an amplitude that appears in the sideband frequenc

The Effectiveness Of Google Classroom and Dojo Class Using the Discovery Learning Model on The Learning Outcomes of Vocational School Students

The aims of this study were to determine: (1) student learning outcomes through the use of Google Classroom and Class Dojo with the discovery learning model and (2) the effectiveness and efficiency of using Google Classroom and Class Dojo with the discovery learning model for class X. Multimedia students at SMKN 7 Poor. This research is a quasi-experimental research with quantitative and qualitative methods with the design of "Pre-test Post-test Nonequivalent Control Group". Data collection techniques by conducting interviews, giving treatment during learning, and student response questionnaires. The hypothesis is obtained from efficiency test data and effectiveness test. The results obtained from this study are: (1) the implementation of learning using Google Classroom and Class Dojo with the discovery learning model has increased learning outcomes and (2) the use of Google Classroom and Class Dojo with the discovery learning model provides efficient and effective results. In terms of efficiency and effectiveness, learning using Class Dojo with the discovery learning model is more efficient and effective compared to Google Classroom.

DESAIN STNK DIGITAL DENGAN CHIP ESP8266 BERBASIS INTERNET of THINGS (IoT) DALAM ERA INDUSTRI 4.0

Setiap tahun jumlah kendaraan yang ada di Indonesia selalu bertambah. Jumlah kendaraan bermotor yang semakin banyak dapat menimbulkan masalah lalu lintas di jalan. Masalah sosisal, kriminal, maupun masalah politik bisa timbul karena sulitnya pengawasan terhadap kendaraan bermotor yang beredar di jalanan Indonesia. Internet of Things (IoT) dapat digunakan sebagai alat kontrol pendeteksi kendaraan sehingga tercipta solusi Green Economic Development City Smart dengan Sistem Transportasi yang baik dalam penanganan kendaraan bermotor. Sensor dengan teknologi IoT yang dipasang pada kendaraan bermotor dapat mengenali kendaraan melalui model informasi SSID plat nomor kendaraan. Sistem IoT yang terhubung dengan deteksi plat nomor kendaraan bermotor di embedded ke dalam sebuah chip digital yang dipasang pada setiap kendaraan bermotor. Implementasi IoT untuk Surat Tanda Nomor Kendaraan (STNK) Digital merupakan sebuah aplikasi Android yang terintegrasi dengan CHIP ESP8266 yang tertanam di kendaraan bermotor yang berisi identitas kendaraan bermotor dan pemilik kendaraan. CHIP ESP8266 berfungsi sebagai perangkat identifikasi terhadap kendaraan bermotor yang terintegrasi antara plat, nomor rangka, nomor mesin kendaraan dan STNK. Dengan adanya identifikasi ini maka STNK Digital hanya bisa digunakan oleh orang yang berhak melalui aplikasi smartphone dapat menjawab tantangan industry 4.0 yang menghendaki system yang terintegrasi

Correlations Analysis of Airport Sustainability and Local Government Budget

The development of a public private partnership business centre in the region, particularly in the airport area, will improve regional economic equity. This study aims to analyse the correlation between airport sustainability and local government budget in Indonesia. The method used in this research is mixed method research. The results indicate that a cooperation agreement between the local government and the airport management will generate mutual benefits for both parties. Airport managers can improve their services to consumers and local governments receive contributions during the term of the agreement. Based on the T-Value Test Result, the T-value for the Airport Performance variable is 0.694. T-Value Test Results and compared with T-table equal to 1,976 (significant level 0,05) hence T-count <T-table thus variable of Airport Performance is predicted not to have a significant correlation to Local Government Budget (APBD) Performance. Regional governments are expected to participate more actively in investments or asset sharing of airports in the region

Evaluation of Three Working Fluid on an Organic Rankine Cycle of a Waste Heat Recovery Electric Generator

The aim of this study is to evaluating an Organic Rankine Cycle (ORC) system from diesel engine waste heat recovery by selecting three different working fluids with different pressure and temperature condition. N-Pentane, R-245fa, and R-134a are conditioned on variations in pressure and evaporation temperature with a difference of 0.5 bar and 5 °C from the previous best practice to achieve the best thermal efficiency. The proposed evaluation involved two phases, first is analysis of the working fluid with various condition is carried out using REFPROP software and then results of that analysis will be used as the basis of input in calculating the overall heat balance using the Cycle Tempo software. This study found that a diesel engine with a capacity of 1000 kVA wastes energy of 1177 kW which is released through exhaust pipe and engine radiator can produce a turbine power of 144,47 kW. The highest thermal efficiency of 13.48% was obtained by using the working fluid R-245fa at the evaporator pressure and temperature of 23.5 bar and 154 â°C, respectively

Evaluation of Three Working Fluid on an Organic Rankine Cycle of a Waste Heat Recovery Electric Generator

The aim of this study is to evaluating an Organic Rankine Cycle (ORC) system from diesel engine waste heat recovery by selecting three different working fluids with different pressure and temperature condition. N-Pentane, R-245fa, and R-134a are conditioned on variations in pressure and evaporation temperature with a difference of 0.5 bar and 5 °C from the previous best practice to achieve the best thermal efficiency. The proposed evaluation involved two phases, first is analysis of the working fluid with various condition is carried out using REFPROP software and then results of that analysis will be used as the basis of input in calculating the overall heat balance using the Cycle Tempo software. This study found that a diesel engine with a capacity of 1000 kVA wastes energy of 1177 kW which is released through exhaust pipe and engine radiator can produce a turbine power of 144,47 kW. The highest thermal efficiency of 13.48% was obtained by using the working fluid R-245fa at the evaporator pressure and temperature of 23.5 bar and 154 â°C, respectively