caa a22 4500 606189432 CHVBK 20210128100850.0 cr unu---uuuuu 210128e20150901xx s 000 0 eng 10.1007/s10891-015-1291-6 doi (NATIONALLICENCE)springer-10.1007/s10891-015-1291-6 Moshinskii A. St. Petersburg Chemical-Pharmaceutical Academy, 14 Prof. Popov Str., 193376, St. Petersburg, Russia aut Analysis of the Region of Validity of Equations for Calculating Heat Exchangers of the Tube-in-Tube Type [Elektronische Daten] [A. Moshinskii] Based on the traditional model with direct flow and counterflow of heat transfer agents in a stationary regime, the operation of a heat exchanger of the tube-in-tube type is analyzed. Account is taken of the natural limitations for the model that are connected with the possibility of practical realization of the similarity numbers involved in the equations of the model, as well as with the conditions (assumptions) invoked in the derivation of the model. A comparison of the efficiency of heat transfer in the noted regimes of heat transfer agent motions is made. For the purposes of this comparison, it is proposed to use an averaged value of the function that represents the ratio of efficiencies with heat transfer agent direct flow and counterflow over the region of possible values of similarity numbers. The necessary calculations and illustrations are presented. Springer Science+Business Media New York, 2015 heat transfer nationallicence heat exchanger nationallicence heat transfer agent nationallicence direct flow nationallicence counterflow nationallicence Journal of Engineering Physics and Thermophysics Springer US; http://www.springer-ny.com 88/5(2015-09-01), 1119-1130 1062-0125 88:5<1119 2015 88 10891 https://doi.org/10.1007/s10891-015-1291-6 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10891-015-1291-6 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Moshinskii A. St. Petersburg Chemical-Pharmaceutical Academy, 14 Prof. Popov Str., 193376, St. Petersburg, Russia aut NATIONALLICENCE 773 0- Journal of Engineering Physics and Thermophysics Springer US; http://www.springer-ny.com 88/5(2015-09-01), 1119-1130 1062-0125 88:5<1119 2015 88 10891