One Million Red Ribbons

The analysis of known solutions to design annulus, it was decided to abandon the intensifying heat transfer fluid flow patterns: cross-washing tubes with segmental partitions; swirl flow in the annulus with the help of specially made shear walls or by partitioning into the annular space in the form of twisted ribbons, etc. Therefore, considered heat exchangers are simple so-called reverse current circuit coolant, the space between the tubes do not cross partitions, install only one longitudinal septum. In addition, revised decision on the pipe wall thickness, shells, flanges, tube sheets, covers, without reducing their strength. Experience to date experience in operating this type of heat exchanger is shown that the devices, in contrast to plate heat exchangers are not very sensitive to sudden temperature fluctuations and pressure. Their tube bundles easily and withstand the effects hydroblows, vibration, shaking. Pipes for supplying and draining medium located in the head coil (figure), which provides the convenience of strapping heaters and reduce thermal strains. At nominal values of expenditure-type heat exchangers have vvpi moderate pressure drop of 20-50 kPa, which in the case of the need for large heat fluxes at low temperature pressures connecting heaters in the units in parallel or sequentially in both Wednesdays, or a combination of schemes of their connections in the block. Pigging these heat exchangers can be made by any known method: chemical (1,5% aqueous solution of nitric acid), cavitation shock method, the steel wire hedgehogs, etc. Designed heat exchangers for energy and weight and size characteristics are second only to shell and type of vehicles ttai, but surpass the latter in Indicators of reliability due to the greater rigidity of tubes (lack of sag, and consequently the friction of pipes against each other) and a more reliable fastening tubes in tube sheets by welding, rather than silicone.