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a. Assuming the outside heat transfer coefficient remains the same as that for 25-bar saturated steam (i.e. it is independent of steam pressure and temperature), estimate the steam pressure necessary for the new operating conditions. b. Accounting for the variation of the external heat transfer coefficient with steam pressure, evaluate the proposal by plotting the effect of saturated steam pressure (temperature) on the air flow rate that can be achieved with the same temperature rise. a. Assuming the outside heat transfer coefficient remains the same as that for 25-bar saturated steam (i.e. it is independent of steam pressure and temperature), estimate the steam pressure necessary for the new operating conditions. b. Accounting for the variation of the external heat transfer coefficient with steam pressure, evaluate the proposal by plotting the effect of saturated steam pressure (temperature) on the air flow rate that can be achieved with the same temperature rise