ISSN:0145-7632    

DOI:10.1080/01457638708962798

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The growth of the shell-and-tube heat exchanger design has been a tedious task that has evolved over many years and will continue to mature for many more. Set forth in this paper are (1) a historical and chronological summary of the major contributions to the state of the art, with special emphasis on the contributions of Karl A. Gardner; (2) an analysis of the relationship of shell-and-tube heat exchanger mechanical design to the requirements of a process system; (3) a summary of some of the efforts presently being advanced; and (4) a challenge to explore and conquer areas in need of development.

ISSN:0145-7632    

DOI:10.1080/01457638708962799

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

This paper presents procedures for computing stresses in floating-head and fixed-tubesheet heat exchangers. It does not cover U-tube exchangers. It was prepared in connection with the activities of the Special Working Group on Heat Transfer Equipment, Section VIII, of the ASME Boiler and Pressure Vessel Code Committee, for their use and consideration in the drafting of code rules for these items. The mathematical procedures are closely associated with the publications of K. A. Gardner and K. A. G. Miller [1–3].

ISSN:0145-7632    

DOI:10.1080/01457638708962800

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

A simplified design procedure is presented to determine tubesheet thickness in U-tube, floating-head, and fixed-tubesheet shell-and-tube exchangers. The procedure is based on classical plate-and-shell theory and permits a design code-oriented manual solution procedure. The configuration analyzed includes an unperforated rim, three different tubesheet head-shell-joint configurations, and arbitrary material properties for each component. Thermal loading due to differential radial expansion and the effect of local pressures acting on the head and shell walls are included.

ISSN:0145-7632    

DOI:10.1080/01457638708962801

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

A method for computing the thickness of a tubesheet extension (rim) used as a flange is proposed. The method treats both fixed and floating-head stationary tubesheets and U-tube tubesheets. Numerical examples illustrate the calculation method.

ISSN:0145-7632    

DOI:10.1080/01457638708962802

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The purpose of this presentation is to introduce in a broadbrush approach basic aspects of the mechanical design and fabrication of shell-and-tube heat exchangers.

ISSN:0145-7632    

DOI:10.1080/01457638708962803

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Avoiding flow-induced vibration damage is a major concern to the designers and operators of shell-and-tube heat exchangers. This paper discusses the characteristics of tube vibration as determined from a research program featuring tests of an industrial-size exchanger. The state of the art in understanding and predicting tube vibration and shell-side flow distribution is briefly reviewed. Finally, research needs are identified and discussed.

ISSN:0145-7632    

DOI:10.1080/01457638708962804

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Because of the potential restriction of plant capacity and increases in fuel consumption cost that result from the removal of closed feedwater heaters from service, there is a need for the application of new design and operation concepts that enhance both the thermal performance and the availability of heaters and their associated systems. Practical operating practices, which take into consideration the highly localized environments in closed feedwater heaters and the individual susceptibilities to failure of the various tube materials in common use, have evolved from direct experience with closed feedwater heater problems. Many electric utilities have adapted these operating concepts in their standard operating procedure. Life extension programs for feedwater heaters that are repaired or to be replaced must include the provision for new operating concepts. Heaters that are subjected to the same operation conditions that led to the original failures may be expected to fail for the same reasons, often in a much shorter time. The acquisition of accurate data on operating performance, the location of tube distress, combined with the application of new, successful practices in feedwater heater design, operation, and maintenance, have provided the best assurance of a satisfactory service life of closed feedwater heaters.

ISSN:0145-7632    

DOI:10.1080/01457638708962805

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0145-7632    

DOI:10.1080/01457638708962806

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The past five years have seen considerable interest in the possibility of constructing diesel engines in which all or part of the combustion chamber is insulated from the environment. either by ceramic materials or by high-temperature alloys backed with an air gap. It is hoped that such a design will permit engine mass to be reduced by the elimination of water cooling, and engine efficiency to be increased by the use of a secondary cycle to extract heat from the exhaust gases. In assessing the practicality of an uncooled engine, it is essential to establish the degree of insulation achievable by a proposed design. This requires identification of the principal heat loss mechanisms. This paper describes the construction of a three-dimensional time-varying combustion-chamber model, and shows that the cyclic motion of the piston leads to an important heat loss not calculable by static models. Insulation is shown to increase the importance of this loss mechanism. Estimates of the loss are given. By adapting methods established for the analysis of thermal regenerators, an approximate closed-form expression for the heat loss is obtained.

ISSN:0145-7632    

DOI:10.1080/01457638708962807

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor