ISSN:0145-7632    

DOI:10.1080/01457639308939790

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Data are reported on the perception of fouling in New Zealand based on 200 companies and the application of nearly 2000 heat exchangers. These data are discussed with respect to their occurrence for various heat exchanger applications, industries, and heat exchanger types. The fouling mitigation strategies applied in New Zealand are depicted and compared with the state of the art in fouling mitigation as found from an extensive literature search. Some comments are made as to the heat exchanger cleaning frequencies in New\Zealand industries. Finally, an attempt is made to provide a reasonably reliable estimate of the annual fouling-related costs in New Zealand. These results are then compared with those previously reported from the United States and England.

ISSN:0145-7632    

DOI:10.1080/01457639308939791

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

An integral approach is extended to determine the optimum dimensions for rectangular longitudinal fins and cylindrical pin fins by incorporating transverse heat conduction. The effects of variable heat transfer coefficient and heat transfer from the fin tip are also taken into account. The mathematical expression for optimum dimension ration thus obtained is found to be as simple as that of the classical one-dimensional approach, but the accuracy of numerical results is improved significantly. The same approach is then utilized for solving for the optimum dimensions of a cylindrical pin fin. To facilitate thermal designers, numerous design charts are presented according to the nature of the flow, the boundary condition at the fin tip, and the types of heat transfer under consideration.

ISSN:0145-7632    

DOI:10.1080/01457639308939792

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

The isothermal flow losses through an array of A-frame finned tube heat exchangers are determined experimentally. Correlations that describe these losses are derived from scale-model tests conducted on different V-bundle configurations, each simulating a section of a typical A-frame array. The experimental data are then compared with test data obtained from a full-scale heat exchanger installation.

ISSN:0145-7632    

DOI:10.1080/01457639308939793

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

This article presents a method for predicting the transient responses to arbitrary inlet temperature changes in multipass shell-and-tube heat exchangers, considering the longitudinal heat conduction in the wall core as well as the thermal capacities of both fluids and the wall. The final solution is obtained by means of numerical inversion of the Laplace transform. The effect of longitudinal heat conduction on transient behavior of heat exchangers is discussed.

ISSN:0145-7632    

DOI:10.1080/01457639308939794

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

A simple method for predicting the thermal performance of multistage heat exchangers is proposed. The technique involves an area weighting scheme of the reseated Colburn J factors. The method is developed for, and probably limited to, applications with indirect contact, direct transfer heat exchangers operated in series. However, condensing heat exchangers are amenable to this technique, and thus it offers more flexibility and wider applicability than previously proposed methods. Experimental data for a two-stage, condensing heat exchanger are reported, and the behavior is compared to the predictive scheme with moderate success. While the behavior of multistage heat exchangers may be affected by interstage spacing, the data from the experiments do not allow quantification of the impact of this effect.

ISSN:0145-7632    

DOI:10.1080/01457639308939795

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor