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Table 2 Overview of modified parameters and variation range for hydraulic optimization

From: Net-exergetic, hydraulic and thermal optimization of coaxial heat exchangers using fixed flow conditions instead of fixed flow rates

Parameters Unit Reference case(st.) Range/variation Abbreviations
\({r}_{{i}}\) [m] [0.01:0.99]  
\({\text{SDR}}\) \([-]\) 11 6 7.4 9 11 13.6  
17 21 26 33 41  
flow type \([-]\) Turbulent Laminar  
Turbulent rough regime  
\({Re}\) \([-]\) 10000 1000 \(Re_{c,\text{lam}}\)
4000 \(Re_{c,\min}\)
100000 \(Re_{c,\max}\)
\({L}\) [m] 20 5 \(L_{\min}\)
100 \(L_{\max}\)
\({r_a}\) [m] 75 39 \(r_{a,\min}\)
240 \(r_{a,\max}\)
\({k}\) \([-]\) Plastic/steel Steel/plastic \(k_{\text{switch}}\)
Steel/steel \(k_{\text{steel}}\)
(Inner pipe/outer pipe) Plastic/plastic \(k_{\text{plast}}\)