Statistical simulation of the hypersonic aircraft pressurized compartment and surface cooling system thermal state

2019 ◽  
Author(s):  
S. A. Gusev ◽  
V. N. Nikolaev
Keyword(s):  
Thermal State ◽  
Cooling System ◽  
Statistical Simulation ◽  
Surface Cooling ◽  
Hypersonic Aircraft

Definition of the Transfer Function Parameters of Asynchronous Motor as an Object of Temperature Control

2014 ◽  
Vol 698 ◽  
pp. 124-130 ◽  
Author(s):  
Alexander Pugachev ◽  
Galina Fedyaeva
Keyword(s):  
Induction Motors ◽  
Transfer Functions ◽  
Thermal State ◽  
Cooling System ◽  
Asynchronous Motor ◽  
Experimental Investigations ◽  
Thermal Processes ◽  
Variable Speed ◽  
Heating And Cooling ◽  
Definition Of

The analysis and systematization of research methods of thermal state of induction motors including traction ones is done. It is shown that for each type of motor it is necessary to develop its own mathematical model of thermal processes, and its verification should be carried out only on the basis of experimental investigations. The structure and operating principles of the complex developed physical model of the traction electric drive with induction motors is represented. The motors have a cooling system with variable-speed electric fan and subsystem of measurement and recording of monitored parameters. The method and the results of experimental study of the processes of heating and cooling of the induction motor are illustrated. Transfer functions and approximation curves of transients are proposed, their parameters are defined.

scholarly journals Improvement of Endothermic Characteristics with Catalyst Molding in Hypersonic Aircraft Cooling System

2017 ◽  
Vol 21 (3) ◽  
pp. 56-60 ◽  
Author(s):  
Dong Hun Hyeon ◽  
Tae Ho Lee ◽  
Sung Hyun Kim ◽  
Byung Hun Jeong ◽  
Jeong Sik Han
Keyword(s):  
Cooling System ◽  
Hypersonic Aircraft

scholarly journals Cooling of a Processor With the Use of a Heat Pump

2018 ◽  
Vol 28 (1) ◽  
pp. 16-25
Author(s):  
Zygmunt Lipnicki ◽  
Hanna Lechów ◽  
Katarzyna Pantoł
Keyword(s):  
Theoretical Analysis ◽  
Heat Pump ◽  
External Surface ◽  
Cooling System ◽  
Heat Distribution ◽  
Surface Cooling ◽  
Cooling Systems ◽  
Model Calculations ◽  
Systems Model ◽  
Liquid Evaporation

Abstract In this paper the problem of cooling a component, in the interior of which heat is generated due to its work, was solved analytically. the problem of cooling of a processor with the use of a heat pump was solved based on a earlier theoretical analysis of authors of external surface cooling of the cooled component by using the phenomenon of liquid evaporation. Cases of stationary and non-stationary cooling were solved as well. The authors of the work created a simplified non-stationary analytical model describing the phenomenon, thanks to which heat distribution within the component, contact temperature between the component and liquid layer, and the evaporating substance layer thickness in relation to time, were determined. Numerical calculations were performed and appropriate charts were drawn. The resulting earlier analytical solutions allowed conclusions to be drawn, which might be of help to electronics engineers when designing similar cooling systems. Model calculations for a cooling system using a compressor heat pump as an effective method of cooling were performed.

Efficiency Improvement of a Photovoltaic Module Using Front Surface Cooling Method in Summer and Winter Conditions

2018 ◽  
Vol 140 (6) ◽  
Author(s):  
Himanshu Sainthiya ◽  
Narendra S. Beniwal ◽  
Navneet Garg
Keyword(s):  
Output Power ◽  
Cooling System ◽  
Front Surface ◽  
Weather Conditions ◽  
Photovoltaic Module ◽  
Surface Cooling ◽  
Cell Efficiency ◽  
Pumping System ◽  
Winter Conditions ◽  
Cooling Method

Photovoltaic (PV) cells exhibit long-term degradation, when its temperature exceeds a certain limit. On the other hand, decreasing the temperature results in lower PV cell efficiency. The aim of this paper is to demonstrate the improvements in the output power and efficiency of PV modules using a cooling system based on flowing water on the front surface. Front surface cooling method with the help of a water pumping system is one of the most promising methods for cooling the PV cells. With poly-crystalline PV cells, different water flow rates are experimented, and the output power and the efficiency are computed for different weather conditions. These experiments yield that the cell efficiency is improved by approximately 27.3% in winter conditions and 27.6% in summer conditions.

scholarly journals Thermally induced icequakes detected on blue ice areas of the East Antarctic ice sheet

2019 ◽  
Vol 60 (79) ◽  
pp. 45-56 ◽  
Author(s):  
Denis Lombardi ◽  
Irina Gorodetskaya ◽  
Guilhem Barruol ◽  
Thierry Camelbeeck
Keyword(s):  
Thermal State ◽  
Seismic Station ◽  
Ice Sheet ◽  
Leeward Side ◽  
Surface Cooling ◽  
Thermally Induced ◽  
Seismic Waveform ◽  
Dronning Maud Land ◽  
Temporal Occurrence ◽  
Waveform Pattern

ABSTRACTOver a year of seismic observations, ~5000 short duration icequakes were detected by a permanent broadband station installed at the Princess Elisabeth base, located ~180 km inland in eastern Dronning Maud Land, East-Antarctica. Icequake detection via seismic waveform pattern recognition indicates the presence of two dominating clusters of events, totalizing ~1500 icequakes. The corresponding icequake locations point towards two distinct zones of outcropping blue ice areas (BIAs) located respectively at 4 and 1 km from the seismic station, both on the leeward side of a nunatak protruding through the ice sheet. The temporal occurrence of these icequakes suggests a close genetic link with thermal contraction of ice caused by significant surface cooling controlled, in summer by variations in diurnal solar radiation and in winter by strong cooling during cold katabatic regimes. Further analysis demonstrates the dependence of these icequakes on the absolute surface temperature and on its temporal change. Besides providing information on the ice fracture mechanics and rheology, investigations of thermal icequakes may be regarded as a ground-based proxy for the monitoring of the thermal state of BIAs, and characterization of ice-sheet ablation zones.

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