Aircraft engine noise research and development depends on the ability to study and predict the noise created by each engine component in isolation. The presence of a downstream pylon for a model fan test, however, may result in noise contamination through pylon interactions with the free stream and model exhaust airflows. Additionally, there is the problem of separating the fan and jet noise co...

Improving the cooling efficiency of servers has become an essential requirement in data centers today as the power used to cool the servers has become an increasingly large component of the total power consumption. Additionally, fan speed control has emerged in recent years as a critical part of system thermal architecture. However, the state of the art in server fan control often results in ov...

A perfect connection between the column and fan is that which ensures an air inlet in fan, evenly distributed, over entire surface of suction mouth outlet from made a way allows full use developed pressure. For both exhaust, fans must be equipped with device/diffuser. When discharges freely into atmosphere without any connection, loss equivalent to 50% average dynamic pressure at discharge port...

The demand for electrical energy that continues to increase along with the advancement of civilization and also increasing number people as well reduced level fulfillment availability non-renewable sources, it is necessary have renewable resources capable fulfill these in a more environmental friendly. One natural energies we can use wind energy, which easy get lasts continuously. This research...

In this work, we present a control system for mini electrical fan. The aim of work is to design controller prototype an fan within the smart home system. consists STM32L100 microcontroller controlling using pulse-width modulation (PWM), TIP 102 BJT transistor ‘off,’ and ‘on’ fan, 1N4007 fly-back diode. PWM generated by Fan’s speed softly (25%, 50%, 75%, 0% - 100% speed). addition, equipped with...

Additive manufacturing (AM), also known as three-dimensional (3D) printing, is the process of building a solid object in layer-wise manner. Cybersecurity prevalent issue that appears more and frequently AM becomes popular. This paper focuses on effect fan speed printing quality presents plugin called Fan Speed Attack Detection (FSAD) predicts monitors speeds throughout process. The goal to prev...

Component and subsystem models used to evaluate the performance of a low-lift cooling system are described. An air-cooled chiller, a hydronic radiant distribution system, variable-speed control, and peak-shifting controls are modeled. A variable-speed compressor that operates over 20:1 speed range and pressure ratios ranging from one to six is at the heart of the chiller. Condenser fan and chil...

The present study aimed at assessing a novel annular-ducted fan lift system for VTOL aircraft through computational fluid dynamics (CFD) simulations. The power and lift efficiency of the lift fan system in hover mode, the lift and drag in transition mode, the drag and flight speed of the aircraft in cruise mode and the pneumatic coupling of the tip turbine and jet exhaust were studied. The resu...

As for a variable air volume (VAV) system, the air duct static pressure is a typical control variable maintained by modulating supply fan speed. The static pressure equals to the summation of the duct pressure loss downstream of the sensor to the terminal box and box inlet static pressure. Typically, the air duct static pressure is set as a constant set point based on the system design informat...