ISSN:0145-7632    

DOI:10.1080/01457638008939559

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

Published correlations for predicting the two-phase flow pressure drop across ideal tube banks are reviewed and compared with experimental data. No presently available methods can be considered general enough for use under all conditions.

ISSN:0145-7632    

DOI:10.1080/01457638008939560

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

Because of the low heat transfer coefficient of gases, it is necessary to use extended surfaces on the gas side when exchanging heat with liquids or two-phase fluids. Such finned tube exchangers are a very important basic class of heat exchangers. Although finned tube exchangers have been in existence for 50 yr, there have been numerous developments in the technology. This paper attempts to survey the recent developments related to the air-side aspects of heat exchanger design. Nearly all of the recent developments have been empirical because of the complicated gas-side flow structure. Among the developments discussed are the use of special surface geometries for enhanced heat transfer, row effects, local heat transfer coefficient distribution, and correlations for heat transfer coefficient and pressure drop. Two important design configurations—circular finned tubes and plate fin designs—are considered separately.

ISSN:0145-7632    

DOI:10.1080/01457638008939561

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

Heat exchangers using cooling water are designed with fouling resistance applicable to tubular equipment, in most cases TEMA recommended values. Plant experiences indicate that plate heat exchangers produce substantially lower fouling rates due to turbulence induced by the plate corrugations. Furthermore, plate exchangers are more severely penalized by fouling resistance than tubular exchangers because of the high heat transfer coefficients typical of plate exchangers. To supply reliable folding data to the designer, APV Company. Ltd. sponsored a research project to study fouling in plate exchangers with Heat Transfer Research. Inc. (HTRI). The test fluid was a typical, treated cooling-tower water. Results of these experiments, described in this paper, show that at typical operating conditions the fouling resistances for plate exchangers are substantially lower than those used for tubular equipment.

ISSN:0145-7632    

DOI:10.1080/01457638008939562

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

On March 28, 1979, what has been called the worst accident in the history of commercial nuclear power generation occurred at the Three Mile Island no. 2 reactor unit in Pennsylvania. The sequence of events that occurred during the first 16 h of the incident are described. There was extensive damage to the core of the reactor as well as some release of gaseous fission products from the station. However, the radiation doses received by the general public as a result of exposure to this released radioactivity were so small that there will be no detectable adverse health effects. Nevertheless, the accident at Three Mile Island will have a profound effect on commercial nuclear power in the United States and throughout the world.

ISSN:0145-7632    

DOI:10.1080/01457638008939563

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

At the session entitled History and Evolution of Heat Exchanger Equipment and Standards at the ASME/AIChE 18th National Heat Transfer Conference, San Diego, California, August 6-8, 1979, various segments of the history of heat transfer devices were discussed by engineers who had themselves played significant roles in that history. Because of time, topics were limited to those involving shell-and-tube exchangers. One of these historical studies, Joe Sebald's history of the surface condenser, is presented in this issue. It provides an excellent record of the evolution of the modern surface condenser, which is in fact a spectacularly large, fixed, tube sheet shell-and-tube unit. The history of other types of heat transfer apparatus, as well as shell-and-tube exchangers, will appear in this column in future issues.

ISSN:0145-7632    

DOI:10.1080/01457632.1980.10844591

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor