Compact Heat Exchangers: Selection, Design and Operation by J.E. Hesselgreaves

By J.E. Hesselgreaves

This publication provides the information and business recommendations in compact warmth exchanger know-how which were constructed within the final 10 years or so. traditionally, the improvement and alertness of compact warmth exchangers and their surfaces has taken position in a piecemeal style in a few relatively unrelated parts, largely these of the car and best mover, aerospace, cryogenic and refrigeration sectors. a lot unique expertise, customary in a single region, advanced purely slowly over the boundary into one other area. This compartmentalisation used to be a characteristic either one of the consumer industries themselves, and in addition of the provider, or production industries. those obstacles are actually breaking down, with beneficial cross-fertilisation occurring.

one of many business sectors that's waking as much as the demanding situations of compact warmth exchangers is that widely outlined because the technique quarter. If there's a bias within the publication, it's in the direction of this region. the following, in lots of circumstances, the technical demanding situations are serious, considering that excessive pressures and temperatures are frequently concerned, and dealing fluids should be corrosive, reactive or poisonous. The possibilities, in spite of the fact that, are correspondingly excessive, considering the fact that compacts can supply a mixture of reduce capital or put in expense, decrease temperature changes (and consequently working costs), and reduce stock. from time to time they offer the chance for an intensive re-think of the method layout, via the creation of procedure intensification (PI) ideas resembling combining procedure components in a single unit. An instance of this can be response and warmth trade, which deals, between different benefits, considerably reduce spinoff production.

To stimulate destiny study, the writer contains insurance of hitherto missed ways, comparable to that of the second one legislation (of Thermodynamics), pioneered by means of Bejan and co- staff. The justification for this can be that there's expanding curiosity in life-cycle and sustainable techniques to business job as a complete, frequently concerning exergy (Second legislations) research. warmth exchangers, being basic parts of strength and technique platforms, are either savers and spenders of exergy, in keeping with interpretation.

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Example text

G. 013. The values correspond to high fin efficiency values. Thus if the plate gap b is 10mm the minimum thickness is about 0. l mm, or 100~tm. To the fight of the minimum the higher weight represents the cost of extra fin thickness not being compensated for by higher efficiency. To the left the lower efficiency necessitates extra flow Heat Exchanger Reactors 23 length. These values are not far from, and explain the basis for, the very thin fins found in automotive applications such as radiator and heater cores, for lo2 ~..

The second function of fins, both for tubular and plate surfaces, is to enable a low hydraulic diameter, with its advantage for heat transfer coefficient, to be obtained without the secondary surface having to serve a function of separating the two fluids. In the case of plate-fin surfaces the fins also serve to carry mechanical load arising from the differential pressure between streams. This does not apply for a fin- tube surface. Arising from both of the above functions, the consequence is that the fin can be made thinner than the primary surface, thus saving weight and cost.

29) It is perhaps this strong (cubic or above) relationship of pressure drops for unchanged mass flows that has given rise to the often- expressed misunderstanding that a compact exchanger (for N >> 1 compared with conventional dimensions) has a higher pressure drop than a non- compact one, for comparable thermal performance. The misconception centres on the implicit assumption of scaling all of the dimensions simultaneously ('making it smaller'). We have seen in the previous section that a specified pressure drop can be maintained in a compact exchanger by keeping the flow area approximately the same, whilst reducing the flow length in proportion to the hydraulic diameter.

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