A floating photovoltaic system for fishery aeration

Photovoltaic panel as a producer of renewable energy is increasingly being utilized. The electrical energy produced by photovoltaic panel can be used for aeration in fish ponds located quite isolated and far from the main electricity grid. Aeration is important for fishery because it affects the dissolved oxygen level in the water. The system uses two units of 50 Wp floating solar panels and four units of DC aerator of 12 Volt/0.28 A. The measurement of solar irradiance, solar panel temperature, output voltage and current was conducted to monitor floating solar panel performance. Dissolved oxygen level measured in the water without aeration was 3 - 3.9 mg/L while after using floating photovoltaic panels to supply the electrical energy for aerators, dissolved oxygen level in the water was increased to 4.1 - 4.8 mg/L.

Thermal Tactile Perception

Using thermal tactile sensing mechanism based on semi-infinite body model, and combining with the advantages of maximum proportional controller, fuzzy and PID controller, a thermal tactile perception and reproduction experiment device (TTPRED) was designed based on the composite control strategy of threshold switching. The finger difference threshold measurement experiment of thermal tactile was carried out and the finger thermal tactile difference threshold was measured. The relationship between thermal tactile sensation and emotion based on temperature cues has been explored. The experiment results show that, the temperature control range of TTPRED is from -10℃ to 130℃, the temperature resolution and precision are 0.01℃ and ±0.1℃ respectively, the maximum heating or cooling rate is greater than 12℃, and the TTPRED can realize the temperature output of the specific waveform quickly and accurately. The experiment results of psychophysical experiment will provide the experimental foundations and technical support for the further study of thermal tactile perception and reproduction.

Thermal Tactile Perception

Using thermal tactile sensing mechanism based on semi-infinite body model, and combining with the advantages of maximum proportional controller, fuzzy and PID controller, a thermal tactile perception and reproduction experiment device (TTPRED) was designed based on the composite control strategy of threshold switching. The finger difference threshold measurement experiment of thermal tactile was carried out and the finger thermal tactile difference threshold was measured. The relationship between thermal tactile sensation and emotion based on temperature cues has been explored. The experiment results show that, the temperature control range of TTPRED is from -10℃ to 130℃, the temperature resolution and precision are 0.01℃ and ±0.1℃ respectively, the maximum heating or cooling rate is greater than 12℃, and the TTPRED can realize the temperature output of the specific waveform quickly and accurately. The experiment results of psychophysical experiment will provide the experimental foundations and technical support for the further study of thermal tactile perception and reproduction.

Infrared Thermometer using Arduino

In gift things, social distancing is that the most vital reality. Moreover, the very fact is COVID-19 patient's initial symptom is vital sign is high. the explanation why, measure body temperature is most vital, however has to maintain social distancing. Whereas ancient thermometers can’t confirm of social distancing, wherever our developed contactless measuring system are able to do temperature on show by victimisation Arduino uno because the main management device also as MLX90615 because the infrared (IR) measuring system device. As a result, compared with the standard measuring system, it shows robust points like convenient reading, wide selection of temperature activity, and accuracy wherever temperature output is displayed digitally. Besides, it might be used all over attributable to its easy-handling

Design of Augmented Cooling System for Urban Solar PV System

Solar photovoltaic (PV) panels have been widely used to convert the renewable energy from the sun to electrical energy to power electrical loads but suffers from relatively low efficiency between 15% to 22%. Typically, the panels have an average lifespan of 25 to 30 years but could degrade quicker due to the panel overheating. Beyond the optimum working temperature of 25°C, a drop of efficiency by 0.4 to 0.5% for every 1°C had been reported. For solar PV applications in urban regions, passive cooling is beneficial due to limited amount of space and lower energy consumption compared to active cooling. A solar PV system with augmented cooling was conducted at a balcony of a condominium from 10am until 2pm. The solar PV system consisted of an Arduino controller, solar panel module, temperature sensor and LCD monitor. Reusable cold and hot gel packs were attached to the bottom of the solar PV. Both setups of solar PV panel with and without the cooling system were placed at the balcony simultaneously for measurement of temperature, output voltage and current. From this research, the outcome of implementing a cooling system to the solar PV increases the efficiency of the energy conversion.

IoTTECH : TECHNOLOGY INTERNET OF THINGS (IoT) UNTUK PENGATURAN OTOMATIS KELEMBABAN & TEMPERATUR RUANGAN BUDIDAYA JAMUR TIRAM (PLEUROTUS OSTREATUS)

Hasil dari alat IoTTech Internet of Things (IoT) budidaya Jamur Tiram mengontrol temperatur dan kelembaban ruangan rumah budidaya Jamur Tiram. Teknologi IOTTECH ini memiliki input sensor DHT11 untuk diproses ke Arduino mega dan ethernet shield sedangkan output alat ini adalah smartphone android, actuator, control kelembaban dan temperatur menggunakan aplikasi Blynk. Proses awal dengan sensor DHT11 mengirimkan data ke mikrokontroller untuk proses menampilkan nilai output humadity, LDR dan temperature, output ditampilkan pada smartphone android sebagai interface pemantauan dengan aplikasi Blynk sebagai monitoring dari jauh. Penelitian ini menghasilkan prototype untuk output humadity, LDR dan temperature udara pada rumah jamur dengan menggunakan Internet of Thing (IoT) menggunakan blynk. Pengaturan output humadity, LDR dan temperature memafaatkan IoT melalui blynk, lebih efesien baik dari waktu dan biaya. Actuator akan hidup otomatas sesuai dengan humadity, LDR dan temperature yang sudah diatur.

EVALUASI DAN OPTIMASI EFISIENSI ENERGI SISTEM CHILLER DENGAN PROSES DESCALING

Chiller system consumes most energy (around 50%) of the electrical energy in a building. To reduce the use of energy, it is necessary to evaluate the use of energy and identify opportunities for energy savings and recommendations for increasing efficiency. The evaluation aims to ensure that a chiller system works and produces chilled water products as designed. The chiller system evaluation includes the evaluation of the chiller refrigeration system, power consumption, cooling capacity, as well as the evaluation of the piping system and pumps. Evaluation is carried out on the system before and after repairing/descaling on the chiller system. The results of the evaluation and optimization of the chiller system are: the chilled water temperature output drops to 15oC, the cooling capacity of the chiller rises to 30 KW, the pressure of the condenser coolant pump rises to 0.58 bar. While the efficiency of the circulating pump system is 15.8%; efficiency of condenser cooling pump is 19.3% and distribution pump system efficiency is 14.1%. Keywords: performance evaluation, optimization, chiller system.

Dynamic Characterization and Robustness Test of High Voltage SiC MOSFETs

This work addresses the electrical behaviour of high-voltage (HV) SiC MOSFETs, being the main motivation to check their robustness. Large area (25 mm2) devices rated for 3.3 kV applications were fabricated with a special process for the gate oxide formation. The unit cell was designed to achieve good short-circuit performance. Static and dynamic characterization is presented at room and high temperature. Output curves and 3rd quadrant behaviour were analysed. Dynamic tests were performed at high bus voltages and high current. To check device robustness, short-circuit and power cycling’s were considered. Robustness test results put in evidence the achievement of reasonable good results obtained due to a suitable cell design.