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Analiza konstrukcji wymienników wyparnych na przykładzie wymiennika krzyżowego: wyniki symulacji numerycznej

Pandelidis D., Anisimov S.

Rynek Instalacyjny

2014

Nr 10

64--68

W artykule przedstawione zostały wyniki symulacji numerycznej procesów wymiany ciepła i masy w ożebrowanym wymienniku wykorzystującym przepływ krzyżowy. Zaprezentowane wyniki dotyczą porównania efektywności temperaturowej dwóch typów wymienników o różnej konstrukcji, analizy wymiany ciepła na powierzchni ożebrowanej oraz wpływu różnych cech charakterystycznych wypełnienia na skuteczność chłodniczą pośrednich rekuperatorów wyparnych.

The first article (RI 3/2014) presented the characteristics of indirect evaporative heat exchangers structure. The materials most often used in for of this type of units construction were presented. Also, the materials that can be used in the future have been shown. Differ-ent types of ribs, used in such devices, were presented, with the original mathematical model ĺ-NTU, describing nonlinear processes of heat and mass transfer in finned heat exchanger that uses the cross- flow pattern has been shown. In this part of the paper the results of numerical simulation will be presented. The results presented refer to comparing the temperature effectiveness of two types of ex-changer with different construction, heat transfer analysis for finned surface and the impact of different filling characteristics on the performance of indirect evaporative cooling recuperators.

The concept of a new approximate relation for exchanger heat transfer effectiveness for a cross-flow heat exchanger with unmixed fluids

Laskowski R.

Journal of Power Technologies

2011

Vol. 91, nr 2

93-101

This paper presents an approximate relation for the heat transfer effectiveness for a counter-flow heat exchanger, which was compared with the exact solution. Based on the obtained approximate relation for a counter-flow heat exchanger the approximate heat transfer effectiveness for a cross-flow heat exchanger in which both fluids do not mix is proposed. This approximate exchanger heat transfer effectiveness was compared with the exact solution proposed by Mason, the most well-known relation. A comparison between the most frequently used approximate formula and the exact solution proposed by Mason was made, too. The exchanger heat transfer effectiveness was analyzed for the ratio of the heat capacity rate of fluids C in the range from 0 to 1 and the number of transfer units NTU from the most common range 0-5.

Experimental and numerical analyses of finned cross flow heat exchangers efficiency under non-uniform gas inlet flow conditions

Bury T., Składzień J., Widziewicz K.

Archives of Thermodynamics

2010

Vol. 31, no. 4

133-144

The work deals with experimental and numerical thermodynamic analyses of cross-flow finned tube heat exchangers of the gas-liquid type. The aim of the work is to determine an impact of the gas non-uniform inlet on the heat exchangers performance. The measurements have been carried out on a special testing rig and own numerical code has been used for numerical simulations. Analysis of the experimental and numerical results has shown that the range of the non-uniform air inlet to the considered heat exchangers may be significant and it can significantly affect the heat exchanger efficiency.