SVIBOR - Project code: 2-05-241

MINISTRY OF SCIENCE AND TECHNOLOGY

Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69
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Project code: 2-05-241

HEAT DISSIPATION FROM CORRUGATED TANKS TO AIR

Main researcher: GODEC, ZDENKO (13636)

Assistants

PODOBNIK, VLADIMIR (84053)
GARDIJAN, RAJKO (134475)
PAVELKA, DAMIR (131992)

Type of research: applied
Duration from: 04/30/91. to 12/31/94.

Papers on project (total): 19
Papers on project quoted in Current Contents: 1

Institution name: Končar, Institut za elektrotehniku, Zagreb (8)
Department/Institute: Transformer Department
Address: Baštijanova bb
City: 10000 - Zagreb, Croatia

Communication: Phone: 385 (0)1 301 631; Fax: 385 (0)1 318 815

Summary: Heat dissipation from device immersed in corrugated-wall tanks filled with dielecric fluids has been poorly investigated, despite the fact that corrugated tanks are frequently used (distribution transformers, reactors, rectifiers). For the purpose of better understanding factors that effect the steady-state temperature rises and for the purpose of optimizing the design of corrugated tanks and devices, cooling effects of following factors are experimentally investigated: fin depth of corrugated wall (0-50-130-205-280-350mm), fin pitch (35-45-60mm), height of corrugated wall (600-700-800-900mm), and position of heat source (device - active part of transformer) relatively to heat sink (corrugated wall of tank). On the basis of experimental results and theories of fluid flow, heat conduction and heat radiation, a mathematical model has been set for computation of characteristic steady-state temperature rises of dielectric fluid. The mathematical model has been tested against measured stady-state temperature rises of distribution transformers with corrugated tank. Very good agreement of results has been found. As a part of the project a new way of expressing measurement result, which harmonize with a new international agreement, is also elaborated.

Keywords: Corrugated tank, Natural cooling, Steady-state temperature rise, Experiments, Measurements, Physical model, Mathematical model, Oil-immersed transformer, Distribution transformer, Uncertainty in measurement

Research goals: Better understanding of thermal states and factors that effect them at the cooling of heat sources (devices) immersed in corrugated-wall tanks filled with different dielectric fluids. Setting of a new and more accurate algorithm for calculation of characteristic temperature rises. Optimization of design of corrugated tanks. Savings of materials for corrugared tanks and davices.

Other information about the project.


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Last update: 09/28/95
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