Abstract
A relation for calculation of the effective overall heat transfer coefficient in a triple concentric-tube heat exchanger is proposed. The relation of the effective overall heat transfer coefficient is obtained based on total thermal resistance and it is applied within a case study for thermal analysis of two triple concentric-tube heat exchangers with different geometries, hot fluids and operating conditions. Through case study it is found that the values of effective overall heat transfer coefficient can be obtained with acceptable errors, up to 3 % for both heat exchangers.
Highlights
A relation for calculation of the effective overall heat transfer coefficient in a triple concentric-tube heat exchanger is proposed
In a triple concentric-tube heat exchanger the fluid to be cooled or heated flows through the inner annulus formed between the inner tube and the intermediate one, and the heating or the cooling medium flows in the inner tube and the outer annulus formed between the intermediate tube and the outer tube
One heat transfer direction is that of the cold fluid that flows through the inner tube, for which the overall htreaantsfterarndsirfeerctcioonefifsicoief ntht,eUc1oilsd as defined
Summary
In this a triple section presents concentric-tube htheeatceaxlccuhlaantigoenr,owf Uhe1,reU2haont dfluUidef flows through the inner annulus and cold fluid flows through the inner tube (fluid C1) and outer annulus (fluid C2) under counter-current arrangement. ManedanUsef can be obtained based of an analogy with the electric resistances expressions considering convection and conduction in cylindrical coordinates. For the thermal resistances series and expressions analogous to Newton’s law of cooling, the expressions of the heat flow rates for the the cold cold fluid fluid that that flows flows through through the the inner outer atunbneul(uQs1()Qa2n)dafroer:. In equation (2), Rt2 is the thermal resistance series corresponding to Q2, expressed as follows (4). From the equations (3) and (5), there was obtained the following expression of U1 for the outside area of the inner tube:. For the parallel heat the expressions of the transfer in the heat flow rate heat exchanger and the total heat transfer based on the hot fluid (Q) can be written area as: which equals the sum. TawaaelrrlhmeefeotphrtrheeebremoalottsChugp1ar,ceermoisctlhidCaf2mni,fcldmuicihtdHmCe1saianear,teanstCnd,t2hitnthee,Co1mtomHtuinpftl,aueastirrsCdae2,tfotulauhotrn,weedtidHnr∆oiaulftefttlemetar1st,er,e∆encmtcpltCmpeh12es,ea.crnaFpooCtduu2r,∆rttcelhtepslemHt, counter-current flow arrangement, be expressed as Batmaz [5]
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