ISSN:0145-7632    

DOI:10.1080/01457638108962757

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Heat transfer coefficients calculated from accepted correlations, but using physical properties derived from different sources, are compared with experimentally determined local heat transfer coefficients. In all cases, consistent, accurate property data yield more accurate estimates of the heat transfer coefficients.

ISSN:0145-7632    

DOI:10.1080/01457638108962758

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

A new concept in the design of heat exchangers has been developed and is now in production. This paper outlines the generic design concept of the cartridge heat exchanger.

ISSN:0145-7632    

DOI:10.1080/01457638108962759

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

This paper surveys the evolution of special surface geometries that promote high-performance nucleate boiling. Early work by Jakob and Fritz in 1931 showed that emery paper roughening or machined grooves provided only temporary performance increase. However, this improvement dissipated after a few days to the flat surface value. There was little sustained interest in this unique, but apparently unuseful, phenomenon until the mid-1950s. During the period 1955-1965, supporting fundamental studies of the character and stability of nucleation sites provided a basis for renewed efforts to develop a high area density of stable, artificially formed nucleation sites whose performance does not deteriorate with time. Beginning in 1968 industrial research produced patented technology that achieved the long-sought goal. In 1980 at least six high-performance nucleate boiling surfaces were commercially available. The technology reported in this paper represents a dramatic advance in the field of heat transfer.

ISSN:0145-7632    

DOI:10.1080/01457638108962760

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Large-scale research and testing in the area of energy conversion become a fundamental necessity during the current national effort to commercialize proven processes that have been dormant for many years. A recent example of such necessity is the on-site use of a 1-MWe ocean thermal energy conversion (OTEC) system where ocean temperatures are suitable for energy extraction. Other experimental examples are the coal liquefaction plants currently under construction, as well as many first-of-their-kind syngas systems and “combined cycle“power-generating loops. The large investment in such research design and development projects is further extended by the cost of operation, where budget limitation may force the preclusion of certain test objectives or the premature termination of ongoing test programs. To reduce the probability of such happenings, optimal test programs need to be devised and implemented. This article deals with various aspects of such testing optimization. It is hoped that some of the stated opinions or cited experience will be considered by planners of large experiments so that costly and irretrievable operation time may be utilized for maximum results.

ISSN:0145-7632    

DOI:10.1080/01457638108962761

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

An analysis is presented of the effect of altitude on heat transfer from an RCA 8807 power tube. Results of this analysis are included along with a comparison with existing data. A generalization of the results is presented as is a method that allows the design engineer to make use of the results in new and existing transmitter designs.

ISSN:0145-7632    

DOI:10.1080/01457638108962762

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The shell-and-tube heat exchanger (SBE), with its tubes held in plate baffles to produce cross flow of the shell-side fluid, has recently been modified to produce a RODbaffle heat exchanger (RBE) free from tube failure due to vibration. The results showed slightly enhanced heat transfer coefficients with significant reductions in pressure loss, leading to reduced cost of exchangers and in some instances smaller exchangers.

ISSN:0145-7632    

DOI:10.1080/01457638108962763

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

ISSN:0145-7632    

DOI:10.1080/01457638108962764

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor