Rancang Bangun Turbin Angin Untuk Pembangkit Listrik Tenaga Angin (Sebagai Alternatif Pembangkit Listrik Daerah Pesisir Pantai)

The basic working principle of a wind turbine is to convert mechanical energy from the wind into rotary energy on the blades, the turbine rotation is used to turn a generator to produce electricity. The wind turbine under study is a propeller wind turbine whose axis is placed horizontally. The purpose of this study was to determine the output power produced by the wind turbine. Methods The research was conducted using experimental methods. The results showed that the designed wind turbine was able to produce electrical power at wind speeds of less than 40 m/s, overall based on the research that the maximum power value occurred at 17:00 with a wind speed of 28 m/s the power generated was 0.054 Watt, while the lowest turbine output power occurred at 15:00 with a wind speed of 18 m/s turbine output power of 0.025 Watt.

Rancangan Bangun Turbin Mikrohidro Tipe Archimedes Screw Dengan Kapasitas Daya 560 Watt

The performance of a micro-hydro turbine was influenced by several factors, namely the design and the enviromental. This study aims to obtain the appropriate design parameters for the manufacture of screw turbines. This research was focused on blade dimensions and turbine screw pitch distance. The calculations were performed using several screw turbine fixing formulations. The design results show that the optimum blade diameter and turbine pitch range are 0.213 m and 0.312 m at 0.2 m3 / s of turbine inlet water flow and 563.3 Watt turbine shaft output power. The turbine screw test results of the design were carried out in the river flow of Puri Kedaton Housing, Pematang Gajah Village, Rt 13, Jambi Province. The test results show that the highest turbine power occurs at 30 kg shaft loading with a turbine output power of 445 Watts and an efficiency of 78.9%.

Sleep actigraphy time-synchronized with wind turbine output

Studies have yielded inconsistent evidence for an association between long-term average wind turbine sound pressure level (SPL) and disturbed sleep. Transient changes in sleep may be more susceptible to short-term variations in wind turbine SPL throughout the sleep period time. We analyzed sleep actigraphy data (subject sleep nights=2094, males=151, females=192) in 10 min intervals time-synchronized to wind turbine supervisory control and data acquisition. Calculated indoor wind turbine SPL was considered after adjusting for turbine rotor speed and closed/open bedroom windows. Maximum calculated nightly average wind turbine SPL reached 44.7 dBA (mean=32.9, SD=6.4) outdoors, and 31.4 dBA (mean=12.5, SD=8.3) indoors. Wind turbine SPL in 10 min intervals, and nightly averages, were not statistically associated with actigraphy outcomes. However, the variability in wind turbine SPL due to changes in wind turbine operation across the sleep period time, as measured by the difference between the 10 min SPL and the nightly average SPL (∆SPL), was statistically related to awakenings (p=0.028) and motility (p=0.015) rates. These diminutive differences translate to less than 1 min of additional awake and motility time for a 5 dBA increase over a 450 min sleep period time. Overall results showed that wind turbine SPL below 45 dBA was not associated with any consequential changes in actigraphy-measured sleep. Observations based on ∆SPL provided some indication that a more sensitive assessment of sleep may be one that considers variations in wind turbine SPL throughout the sleep period time.

Numerical Investigation on the Dynamic Characteristics of an Adjustable Power Turbine Used in Environmental Control System

In this paper, the environmental control system of aircraft driven by a power turbine is further analyzed. Through the numerical simulation of the change of the bleed state under different flight conditions and the change of the flow field under different nozzle opening, the simulation results are verified by the experimental results, and the specific change rules of the power turbine output torque, power, and bleed flow are obtained. It is analyzed quantitatively that adjusting the adjustable nozzle ring can keep the output power stable, widen the flight envelope, and improve the stability of the environmental control system.