Question: 1. A 1/2-in. OD by 6-ft-long tube is to be used to condense steam at 6 psia. Assume that the average tube wall temperature is 1800F. Estimate the mean heat transfer coefficient for this tube in botb horizontal and vertical positions.
2. Water in turbulent flow is being heated in a concentric pipe exchanger by steam condensing in the annulus at 2200F. The water enters at 60°F and leaves at 80°F. If the water rate is doubled, estimate the new exit temperature.