Dissertation > Excellent graduate degree dissertation topics show

Conjugate Heat Transfer in a Partially Open Cubic Enclosure with a Heat-generating Conducting Body

Author: ZhangYaoHua
Tutor: LiXun
School: Tianjin University
Course: Refrigeration and Cryogenic Engineering
Keywords: Transformer Semi-enclosed space Combined heat exchanger Heating element Buried box-type substation Radiator
CLC: TK124
Type: Master's thesis
Year: 2007
Downloads: 91
Quote: 2
Read: Download Dissertation

Abstract


Numerical heat transfer calculation method has a three-dimensional semi-enclosed space with built - in heating element within the composite heat exchanger numerical studies and experiments . Ground box-type substation transformer overall cooling of the project background , isolated fever thus summed up the built-in semi-enclosed space of natural convection and thermal conductivity , the composite radiation heat transfer problems , the calculation results of the analysis . The calculation results show that the overall flow of the complex three-dimensional flow , the local area with a whirlpool improve isolated heating element in position and half the overall height of the closed space , increases the surface area of the heat generating object , the surface emissivity and increased in the high position \exit area , can effectively improve the overall heat transfer performance of the semi-enclosed space . Secondly, preliminary thermal design of the semi-enclosed space outlined by the buried box-type substation engineering background , taking into account the import and export in the same horizontal position this feature , designed baffle at the inlet to prevent the inlet air The high temperature air space immediately mixed , the low-temperature air to smoothly reach the bottom of the main heating element ( transformer) cooling . And of different heights baffle were calculated , and found that the height of the flow plate optimum value exists . In addition , within the semi-enclosed space of the large-size , i.e. large indoor substations radiator chamber forced convection , radiation and thermal conductivity of the composite heat exchanger is calculated , the worsening of the heat exchanger for the internal reflux in the internal fan inlet with the space outside environment between design the ventilation tube , so that heat exchanger to be improved to reduce the maximum temperature of the radiator . Heat transfer and thermodynamics knowledge -piece radiator forced convection cooling area and fan flow optimized preliminary study results showed that when the surface area of the radiator each unit heatsink air flow cross between two adjacent heat sink , fans wasted work minimum cross-sectional area ) . Finally, in order to verify the reliability of the mathematical model , using Pt100 platinum resistance measurements of the the radiator room and transformer room temperature field , basically consistent with the calculated results with the measured temperature backstepping method , in order to verify the reliability of the model and calculation method .

Related Dissertations

  1. Study on the Radiative Heat Elimination by the Spray,TK124
  2. The Equivalent Circuit Model of Radial Vibration Mode Piezoelectric Transformer and Its Application,TM406
  3. Study on the Mechanism of Partial Discharge Emitting Ultrasonic Wave and Propagation Property Within Power Transformers,TM855
  4. Substation Integrated Early Warning System and Application,TM76
  5. Design and Implementation of petrochemical enterprises substation operation system,TP311.52
  6. Dynamic Voltage Restorer Based on Super-capacitor,TM761.1
  7. Fuzzy Control System Design of Transformer Cooler,TP273.4
  8. Research on Signal Processing Unit of Optical Voltage Transformer,TM451.6
  9. Research of Embedded Merging Unit Based on IEC61850,TM45
  10. Research on Electronic Voltage Transformer Based on Capacitive Voltage Divider,TM451
  11. The Research of Electronic Current Transformer and Its Communication Interface,TM452
  12. Calibration and Online Monitoring System for Electronic Transformer Based on IEC61850-9,TM45
  13. Research on Series Resonant High Voltage Capacitor Charging Power Supply,TM53
  14. The Study on the Method of Structural Dynamic Modeling and Analysis of Wind Power Transformers,TM41
  15. The Simulation Renserch of New Series Hybrid Active Power Filter and Some Related Problems Analysis,TN713.8
  16. Conventional Substation Analysis and Design of Renovation Project of Integrated Automation,TM63
  17. Research on Installation and Testing Technique on 500kV Three Phases Compact Transformer,TM407
  18. Research on Trigger System of Surface-breakdown High-voltage Switch,TM564
  19. Electronic Voltage Transformers and the Harmonic Voltage Measurements,TM451
  20. Research on Dynamic Voltage Restorer Based on Three Single-phase H Bridge,TM464
  21. Optimal Power Flow Control Based on Electronic Power Transformer,TM76

CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Thermal Engineering Theory > Heat Transfer
© 2012 www.DissertationTopic.Net  Mobile