Fault Prediction of Fan Cooling System for Aircraft Weather Radar

2019 ◽  
pp. 897-905
Author(s):  
Liu Guihang ◽  
Zhao Shiwei
Keyword(s):  
Cooling System ◽  
Weather Radar ◽  
Fault Prediction ◽  
Fan Cooling

Research on Control Strategy of Hydro-Viscous Driven Fan Cooling System

2014 ◽  
Vol 722 ◽  
pp. 182-189
Author(s):  
Li Gang Ma ◽  
Chang Le Xiang ◽  
Tian Gang Zou ◽  
Fei Hong Mao
Keyword(s):  
Control Strategy ◽  
Cooling System ◽  
Fuzzy Pid ◽  
Loop Control ◽  
Speed Regulation ◽  
Temperature Feedback ◽  
Loop Control System ◽  
System Temperature ◽  
Fan Cooling ◽  
Fan Speed

The paper proposes a cascade control strategy of speed feedback in inner loop and temperature feedback in outer ring for hydro-viscous driven fan cooling system, and compares the simulation of PID and fuzzy PID. The simulation result shows that the double-loop control system while the response time longer, but much smaller overshoot, can achieve a good feedback to adjust the fan speed and temperature and realize stepless speed regulation of hydro-viscous driven fan cooling system under the premise of stability for fan speed and system temperature.

A Numerical Analysis on the System Impedance in a Fan Cooling System

2003 ◽  
Author(s):  
Dong-Il Kim ◽  
Ki-So Bok ◽  
Han-Bae Lee
Keyword(s):  
Numerical Analysis ◽  
Pressure Drop ◽  
Flow Rate ◽  
Pressure Difference ◽  
Cooling System ◽  
Computational Time ◽  
Computational Domain ◽  
Impedance Curve ◽  
Fan Cooling ◽  
Large Investment

To seek the fan operating point on a cooling system with fans, it is very important to determine the system impedance curve and it has been usually examined with the fan tester based on ASHRAE standard and AMCA standard. This leads to a large investment in time and cost, because it could not be executed until the system is made actually. Therefore it is necessary to predict the system impedance curve through numerical analysis so that we could reduce the measurement time and effort. This paper presents how the system impedance curve (pressure drop curve) is computed by CFD in substitute for experiment. In reverse order to the experimental principle of the fan tester, pressure difference was adopted first as inlet and outlet boundary conditions of the system and then flow rate was calculated. After determining the system impedance curve, it was compared with experimental results. Also the computational domain of the system was investigated to minimize computational time.

Spreadsheet Modeling to Size Dairy Sprinkler and Fan Cooling System

2008 ◽  
Author(s):  
Mohamed Samer ◽  
Hartmut Grimm ◽  
Mohamed H Hatem ◽  
Reiner Doluschitz ◽  
Thomas Jungbluth
Keyword(s):  
Cooling System ◽  
Fan Cooling

Investigation of a piezoelectric fan cooling system with multiple magnetic fans

2013 ◽  
Vol 189 ◽  
pp. 356-363 ◽  
Author(s):  
H.K. Ma ◽  
H.C. Su ◽  
W.F. Luo
Keyword(s):  
Cooling System ◽  
Fan Cooling

Sprinkler and Fan Cooling System for Dairy Cows in Hot, Humid Climates

1989 ◽  
Vol 5 (2) ◽  
pp. 231-236 ◽  
Author(s):  
J. T. Strickland ◽  
R. A. Bucklin ◽  
R. A. Nordstedt ◽  
D. K. Beede ◽  
D. R. Bray
Keyword(s):  
Dairy Cows ◽  
Cooling System ◽  
Fan Cooling

scholarly journals Pad and Fan Cooling System

2020 ◽  
Vol 45 (1) ◽  
pp. 13-16
Author(s):  
Tomoharu YAMAGUCHI
Keyword(s):  
Cooling System ◽  
Fan Cooling

A Miniature Double Oscillating-Fan Cooling System Using Electromagnetic Force

2015 ◽  
Author(s):  
Hsien-Chin Su
Keyword(s):  
Electromagnetic Force ◽  
Structural Reliability ◽  
Cooling System ◽  
Low Cost ◽  
Total Power ◽  
Cooling Device ◽  
Design Flexibility ◽  
Total Power Consumption ◽  
Cooling Devices ◽  
Fan Cooling

In this study, an oscillating-fan cooling device using electromagnetic force has been proposed. The device consists of two oscillating-fans flapping back and forth. It requires only one electromagnet and two elastic blades with one magnet on each of them. The electromagnet and two elastic blades are situated on a base and arranged accordingly. And thus, the electromagnetic force generated by the electromagnet can actuate the blades. The main advantage of this cooling device compared to a rotary fan is its simple structure because there is no bearing and motor in the cooling device. Moreover, the simplicity of the device makes it a highly reliable and low cost cooling device. The driving current can be either DC PWM or AC under 8 V – 12 V so it is compatible to most electronic devices. The dimensions of the cooling device can be designed as small as 20 mm (L) * 30 mm (W) * 4 mm (H) and as large as 60 mm * 55 mm * 25 mm. For a cooling experiment, three cooling devices with the dimension of 50 mm * 50 mm * 15 mm were incorporated with a heat sink with the dimension of 190 mm * 110 mm * 15 m. The dummy heater dissipated 55W while the environmental temperature is 44.8 °C. The result showed that the dummy heater can be cooled from 120.7 °C to 69.3 °C while the total power consumption of the three cooling devices is 1.74 W. The result shows that the cooling device not only provides an outstanding cooling ability but also shows a great potential for structural reliability and design flexibility.

Comparison between DC Brushless Fan and DC Hybrid Solar Panel Cooling System

2015 ◽  
Vol 793 ◽  
pp. 373-377
Author(s):  
Y.M. Irwan ◽  
W.Z. Leow ◽  
M. Irwanto ◽  
M. Fareq ◽  
N. Gomesh ◽  
...  
Keyword(s):  
Ambient Temperature ◽  
Output Power ◽  
Solar Irradiance ◽  
Output Voltage ◽  
Cooling System ◽  
Solar Panel ◽  
Output Current ◽  
Pv Module ◽  
Voltage Output ◽  
Fan Cooling

The purpose of this paper is compare between DC brushless fan and DC hybrid solar panel cooling system. The efficiency of PV module is depending on solar irradiance and ambient temperature. As temperature of PV module increase, the output current will increase but output voltage and output power will decrease and also vice versa. As solar irradiance increase, output current and output power will increase with linear and output voltage will increase with marginal and vice versa. The DC cooling system is a way to fix the issue of low efficiency of PV module with the intention to generate more electrical energy. To make an attempt to cool down the PV module, DC brushless fan and water pump with inlet/outlet manifold are built for constant fresh air movement and water flow circulation at the backside and front surface of PV module. The PV module with DC brushless fan cooling system increase 3.47 %, 29.55 %, 32.23 % in term of output voltage, output current, and output power respectively. It decrease 6.1 °C compare than to PV module without DC brushless fan cooling system. While PV module with DC hybrid cooling system increase 4.99 %, 39.90 %, 42.65 % in term of output voltage, output current, and output power respectively. It decrease 6.79 °C compare to PV module without DC hybrid cooling system. The efficiency of PV module with cooling system was increasing compared to PV module without cooling system, for the reason that the ambient temperature dropped significantly. An increase in efficiency of PV module, investment payback period of the system can reduce and the lifespan of PV module will be prolonged.

scholarly journals Exogenous bovine somatotropin and mist-fan cooling synergistically promote the intramammary glucose transport for lactose synthesis in crossbred Holstein cows in the tropics

2021 ◽  
pp. 1247-1257
Author(s):  
Narongsak Chaiyabutr ◽  
Siravit Sitprija ◽  
Somchai Chanpongsang ◽  
Sumpun Thammacharoen
Keyword(s):  
Glucose Transport ◽  
Glucose Utilization ◽  
Cooling System ◽  
High Ambient Temperature ◽  
Phosphate Concentration ◽  
Bovine Somatotropin ◽  
Recombinant Bovine Somatotropin ◽  
Fan Cooling ◽  
Lactose Synthesis ◽  
The Tropics

Background and Aim: Milk synthesis by the mammary gland is negatively influenced in part by high ambient temperature (AT). This study aimed to clarify the pathway of intramammary glucose utilization involved in mediating lactose synthesis during treatment with somatotropin under housing with misters and fans. Materials and Methods: A single subcutaneous injection of 500 mg of recombinant bovine somatotropin (rbST) was administered 3 times once every 14 days to 87.5% crossbred Holstein cattle in early-/mid-/late lactation, under housing in a normal shaded barn and in a shaded barn with a mist-fan cooling system. Results: The milk yields of the cooled cows tended to increase compared with those of uncooled cows and exhibited more potentiated effects in response to rbST treatment, coinciding with increases in mammary plasma flow and glucose uptake, but not in the mammary extraction of glucose. Treatment with rbST in the cooled cows resulted in a greater increase in the milk glucose concentration and a greater decrease in the milk glucose-6-phosphate concentration at all stages of lactation. Conclusion: rbST treatment exerted its galactopoietic action more by local intramammary factors than by other extramammary factors at a low AT and the synergistic effect between rbST treatment and low AT increased the availability of intramammary glucose transport in activating the process of lactose synthesis.

Fault Prediction in Air-Conditioning Refrigeration System by Wavelet Transform

2012 ◽  
Vol 614-615 ◽  
pp. 428-431
Author(s):  
Jian Jun Li ◽  
Zhi Yi Wang ◽  
Dong Zheng
Keyword(s):  
Wavelet Transform ◽  
Air Conditioning ◽  
Cooling System ◽  
Electricity Consumption ◽  
Good Deal ◽  
Basic Function ◽  
Fault Prediction ◽  
Refrigeration System ◽  
Low Performance ◽  
Conditioning Room

A good deal of electricity consumption can be attributed to air-conditioning refrigeration systems. The percentage can be significantly higher if a cooling system is operating at low performance levels due to the presence of faults. The wavelet transform moves data from a time domain to a frequency domain with the wavelet as the basic function giving the localized features of the original signal in the fault detection. It is well known for its capability of treating the transient or time-related varying signals. The fault of heat load increase of the air-conditioning room can be predicted by wavelet transform through the test. Fault prediction in air-conditioning refrigeration system by wavelet transform can avoid defects of the conventional methods.

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