It is desired to generate 500 kg/hr of steam at 180C saturated condition using 20 m² area. Determine the surface temperature. Also estimate the value of convection coefficient.

If a flow through a 62.5 mm ID tube for obtaining the value of convective heat transfer coefficient off 4876 W/m² K for water at a bulk mean temperature of 180C (same as boiling with T = 2.9C). Calculate the flow velocity .What should be the velocity for heat flux to the equal to the critical heat flux ?.

The property values required are : = 2015 10³ J/kg (steam tables)

1 =1.538 10^-4, 1 = 889, v = 5.1533, = 42.16 10^-3 N/m

Pr = 1.044, cp_l = 4417 J/kg K,

Csf = 0.013 (for general application)