In a chiller unit R-123 evaporates at -20ºC in 1-cm-inside-diameter horizontal tubes. The inside surface temperature of the tubes is estimated as 5ºC and film boiling is assumed. Saturated liquid flows in at 20 g/s and is to leave as saturated vapor. Estimate the necessary tube length required. Use hnf = 183.4 kJ/kg and hng = 367.9 kJ/kg for R-123.

What will be an ideal response?


Assuming forced convection in the horizontal tubes, Equation 10-19 can be used to

predict the convective heat transfer coefficient and using an energy balance the length

of the tubes can be determined. The properties of R-123 at 300 K, from Appendix Table



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