Heat exchanger engineering techniques : process, air by Michael J Nee

By Michael J Nee

Sharing his specialist event of choosing warmth exchangers for advertisement installations, fairly by way of floor, Nee discusses recommendations equivalent to solid fluid distribution, operation, upkeep, development, delivery, dealing with, and price

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Extra resources for Heat exchanger engineering techniques : process, air conditioning, and electronic systems : a treatise on heat exchanger installations that did not meet performance

Example text

Generally speaking, if an exchanger does not have to be disassembled for mechanical cleaning, the longer-tube-length exchanger is chosen because of its cost-saving potential. It should be understood that if sufficient space is available for cleaning rods, these factors do not apply and the least expensive exchanger can be selected. 3 PARALLEL FLOW A parallel-flow exchanger is seldom recommended because it is the least efficient exchanger in terms of driving heat from one fluid to another. However, there are applications where its use has benefits, particularly where limiting the transfer of heat is an asset.

Usually they can be met if known in advance. Define method of shipping. Also, date needed at site. Is product solidification possible? Is preventive protection required? Define installation space and access route. Determine type and quantity of spares required. 6). Are vents required? Can venting be through inlet or outlet nozzles? Confirm that warm air out will not be a hazard to personnel or affect nearby equipment. Table 1-4, Features A/C Designers Should Consider There are aspects to workable exchangers not covered in the specifications.

Axial temperature profile in a heat exchanger: (a) counterflow; (b) parallel flow. Parallel flow minimizes the chance that freezing or channeling will occur but does not eliminate the possibility of either. Adding supplemental heat usually solves these problems (see Chapter 12, “Freezing”). 4 TUBE-SIDE CONSIDERATIONS IN SELECTING AN EXCHANGER An efficient heat exchanger is usually one that makes maximum use of the allowable pressure drop on both streams. Modifications to the tube side, assuming a fixed tube length, are limited to changes in the number of passes, in the tube diameter, or in the tube gauge.

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