Page 253 - Handbook of Energy Engineering Calculations
P. 253
FIGURE 2 Steam-water enthalpy-temperature diagram shows the
relation between NaK circuit and steam circuit. Keeping the steam
temperature high raises the thermal efficiency of the plant.
The steam outlet temperature from the boiler will be less than 950°F
(510.0°C) because transfer of heat between the NaK and the water and steam
in the boiler provides the energy required to convert the water to steam. A
temperature difference between the NaK and the steam is needed to produce
the desired heat transfer.
Assume a 50°F (27.8°C) temperature difference between the boiler outlet
steam and the NaK, which is a typical temperature difference for this type of
cycle. With such a temperature difference the outlet steam temperature = 950
