Question 247Steam Plants - Assistant Engineer

The correct answer is C) 1016.40 BTU. To determine the heat required to change the water into steam, we need to calculate the enthalpy of vaporization (latent heat) at the given pressure of 385.3 psig. At this pressure, the saturated steam temperature is approximately 435°F (223.9°C). Using steam tables or appropriate thermodynamic calculations, the enthalpy of vaporization at this temperature is approximately 1016.40 BTU/lb. This is the amount of heat required to change the water into steam, given the initial feed water temperature of 104.5°C. The other options are incorrect because they do not accurately represent the enthalpy of vaporization at the specified pressure and temperature conditions.