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You searched for subject:(condensation of steam). Showing records 1 – 3 of 3 total matches.

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Stellenbosch University

1. Schoenfeld, Paul David. Pressure drop during reflux condensation of steam in an inclined elliptical tube.

Degree: MEng, Mechanical and Mechatronic Engineering, 1998, Stellenbosch University

ENGLISH ABSTRACT: Zapke and Kroger developed a model for the pressure drop across flattened tubes employed in reflux condensers. This model is based on adiabatic two-phase countercurrent experiments and incorporates the theory on fluid friction during condensation by Groenewald. Zapke also developed a correlation with which the flooding velocity during adiabatic countercurrent flow may be predicted. The applicability of both the pressure drop model and the flooding correlation to reflux condensation had prior to this investigation not been verified by experiment. In this investigation the header-to-header pressure drop, the occurrence of flooding and the heat transfer performance of an inclined air-cooled elliptical tube in which reflux condensation of steam occurs were studied. The qualitative effect of the presence of a backflow region on the performance of the tube was also investigated. The 7 m long tube has a height of 97 mm (major axis) and a width of 16 mm (minor axis) and a sharpedged (90°) inlet. The tube is inclined at 60° to the horizontal. Steam temperatures are in the range of 45 °C to 65 °C. The pressure drop measurements obtained in this investigation showed that the header-to-header pressure drop in the tube is predominantly dependent upon the superficial vapor Froude number at the tube entrance. The pressure drop is also accurately predicted by the Zapke-Kroger pressure drop model in the range 0.1 ≤ Fr Hsv ≤ 0.4. At a certain steam flow rate a sudden sharp increase in the pressure drop occurs. This phenomenon is known as flooding. It was found that flooding during reflux condensation is governed by the superficial densimetric vapor Froude number with the duct height taken as the characteristic dimension. The measured vapor velocities at flooding are also in close agreement with those predicted by the Zapke flooding correlation. Flooding was found to have a limiting effect on the heat transfer rate of the elliptical tube in which all the steam condenses in the reflux mode. Finally, the formation of a steam backflow region in the tube resulted in the accumulation of noncondensable gases and the formation of a dead or cold zone. This led to a decrease in the heat transfer rate of the tube.

AFRIKAANSE OPSOMMING: 'n Model is deur Zapke en Kröger ontwikkel om die drukval in plat buise wat in teenvloei kondensers gebruik word te bereken. Hierdie model is op adiabatiese tweefase teenvloei eksperimente gebaseer en sluit die teorie oor wrywing tydens kondensasie deur Groenewald in. Zapke het ook 'n korrelasie ontwikkel waarmee die vloedingsnelheid tydens adiabatiese teenvloei voorspel mag word. Die toepaslikheid van beide die drukval model en die vloedingskorrelasie op teenvloei kondensasie is egter voor hierdie ondersoek nog nie eksperimenteel bevestig nie. In hierdie ondersoek is 'n lugverkoelde elliptiese buis waarin teenvloei kondensasie van stoom plaasvind gebruik om die drukval en vloeding in die buis asook die warmteoordragsvermoë van die buis te bestudeer. Die…

Advisors/Committee Members: Kroger, D. G., Stellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering..

Subjects/Keywords: Condensation; Condensers (Steam); Steam generators; Evaporation, Latent heat of

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Schoenfeld, P. D. (1998). Pressure drop during reflux condensation of steam in an inclined elliptical tube. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/51020

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Schoenfeld, Paul David. “Pressure drop during reflux condensation of steam in an inclined elliptical tube.” 1998. Thesis, Stellenbosch University. Accessed January 22, 2021. http://hdl.handle.net/10019.1/51020.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Schoenfeld, Paul David. “Pressure drop during reflux condensation of steam in an inclined elliptical tube.” 1998. Web. 22 Jan 2021.

Vancouver:

Schoenfeld PD. Pressure drop during reflux condensation of steam in an inclined elliptical tube. [Internet] [Thesis]. Stellenbosch University; 1998. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/10019.1/51020.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Schoenfeld PD. Pressure drop during reflux condensation of steam in an inclined elliptical tube. [Thesis]. Stellenbosch University; 1998. Available from: http://hdl.handle.net/10019.1/51020

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Brno University of Technology

2. Juráš, Filip. Kondenzátor páry: Condenser.

Degree: 2019, Brno University of Technology

The Master´s thesis is dealing with water-cooled condensers and is splitted into three main parts. The first section provides general knowledge about condensers and heat exchangers, including the basic information of hydrophobic surfaces. These surfaces were used during verifying the impact of hydrophobicity on the heat exchange in water steam. The second section describes an experimental testing. It shows the difference between hydrophobic and nonhydrophobic surfaces and their impact on the heat exchange. The third and the last part of this thesis is design and calculation of water-cooled condenser. The design of the condenser is supported by drawings placed in attachement. Advisors/Committee Members: Pospíšil, Jiří (advisor), Baláš, Marek (referee).

Subjects/Keywords: Tepelný výmenník; vodou chladený kondenzátor; kondenzácia vodnej pary; voda; para; trubkové zväzky; vodné chladenie; hydrofóbne povrchy; hydrofobicita; návrh a výpočet kondenzátora.; Heat exchanger; water-cooled condenser; steam condensation; water; steam; tube bundles; water cooling; hydrophobic surfaces; hydrophobicity; design and calculation of water-cooled condenser

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Juráš, F. (2019). Kondenzátor páry: Condenser. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/67556

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Juráš, Filip. “Kondenzátor páry: Condenser.” 2019. Thesis, Brno University of Technology. Accessed January 22, 2021. http://hdl.handle.net/11012/67556.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Juráš, Filip. “Kondenzátor páry: Condenser.” 2019. Web. 22 Jan 2021.

Vancouver:

Juráš F. Kondenzátor páry: Condenser. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/11012/67556.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Juráš F. Kondenzátor páry: Condenser. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/67556

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Brno University of Technology

3. Kubiš, David. Zvýšení ročního využití parního práškového kotle K5 ve ŽĎAS, a. s: Increasing the annual use of steam boilers K5 powder in ŽĎAS, a. S.

Degree: 2019, Brno University of Technology

This mastes´s thesis deals with higher usage of boiler K5 in CHP plant ŽĎAS, a.s. in temporary season, when due to reduced consumption is overheating hot water return branch and there is need to change to another boiler. Main goal of thesis is reduce changes betwen boiler K5 and boiler K3 and increase usage of boiler K5 in temporary season by ekonomic profitablbe technical solution. At the beginning of thesis is described CHP plant ŽĎAS, a.s. and its equipment. Next are four methods of calculation increase year´s usage of boiler K5. And these are cooling hot water return branch using heat exchanger, condensation of part steam from back pressure, reduce minimal power of boiler K5 and usage with small condensing turbine. Thesis is finished with comparison of mentioned methods and experimental reduce of minimal power boiler K5. Advisors/Committee Members: Fiedler, Jan (advisor), Štempel, Pavel (referee).

Subjects/Keywords: Teplárna ŽĎAS; a.s.; kotel; chlazení horkovodu; kondenzace páry; snížení minimálního výkonu kotle; točivá redukce; CHP plant ŽĎAS; a.s.; boiler; cooling hot water return branch; condensation of steam; reduce minimal power of boiler; micro turbine

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Kubiš, D. (2019). Zvýšení ročního využití parního práškového kotle K5 ve ŽĎAS, a. s: Increasing the annual use of steam boilers K5 powder in ŽĎAS, a. S. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/66680

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Kubiš, David. “Zvýšení ročního využití parního práškového kotle K5 ve ŽĎAS, a. s: Increasing the annual use of steam boilers K5 powder in ŽĎAS, a. S.” 2019. Thesis, Brno University of Technology. Accessed January 22, 2021. http://hdl.handle.net/11012/66680.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Kubiš, David. “Zvýšení ročního využití parního práškového kotle K5 ve ŽĎAS, a. s: Increasing the annual use of steam boilers K5 powder in ŽĎAS, a. S.” 2019. Web. 22 Jan 2021.

Vancouver:

Kubiš D. Zvýšení ročního využití parního práškového kotle K5 ve ŽĎAS, a. s: Increasing the annual use of steam boilers K5 powder in ŽĎAS, a. S. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/11012/66680.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kubiš D. Zvýšení ročního využití parního práškového kotle K5 ve ŽĎAS, a. s: Increasing the annual use of steam boilers K5 powder in ŽĎAS, a. S. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/66680

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.