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Table 1 Used variables

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

Variables

Values

Units

Source

\({Re}_{\text{lam}}\)

1000

[-]

(Kratz et al. 1931)

\(Pr\)

26

[-]

(pro 2016)

\({\lambda }_{\text{steel}}\)

60

[W/(m K)]

(VDI 2010-06)

\({\lambda }_{\text{plastic}}\)

0.42

[W/(m K)]

(VDI 2010-06)

\({\lambda }_{\text{brine}}\)

0.513

[W/(m K)]

(pro 2016)

\({k}_{\text{steel}}\)

2

[mm]

(White 2011)

\({k}_{\text{plastic}}\)

0.0015

[mm]

(White 2011)

\({\rho }\)

1036

\([\text{kg}/\text{m}^{3}]\)

(pro 2016)

\({\nu }\)

\(3.35\times 10^{-6}\)

[\(\text{m}^{2}/\text{s}\)]

(pro 2016)

\({c_p}\)

3880

[J/(kg K)]

(pro 20)

\({T_{e}}\)

10

[\({}^\circ \text{C}\)]