Question

The steam condenses on a vertical plane wall, derive expression for the followings :

a. Average heat transfer coefficient

c. Rate of condensation

b. Film thickness

d. rate of heat flow.

Answer 1

Answer:

A

Explanation:

Condensation Heat Transfer

The condensation heat transfer coefficient of the R-134a refrigerant inside plain tubes plotted as a function of the vapor quality is shown in Fig. 10 for mass velocities of G = 300, 600, and 1000 kg/m2s at 40°C saturation temperature and constant heat flux (q″ = 8 kW/m2). The condensation coefficients increased with a decrease in the hydraulic diameter at 40°C saturation temperature in the plain tubes.

Answer 2

Answer is (A) average heat transfer coefficient .