Boiling in a Jacketed Vessel Boiler

Energy Balance (Vapor Phase assume equilibrium)  

= mass flow of vapor through exit valve 

A steady-state mechanical energy balance around the valve results  

It should be noted that the boiling relation and the equation of state both involve the temperature and pressure as unknowns. These two nonlinear algebraic equations must therefore be solved simultaneously. 

EXAMPLE 5.1 Dynamics of a Steam-Power Boiler Let us solve the following boiler dynamic response problem. The data for a steam-power boiler installation for a chemical plant are given in Table 5.1. The plant normally runs with a downstream pressure of 165 psia. Determine the unsteady-state response to an opening in the take-off valve that results in a downstream pressure of 150 psia. The boiling relation is given in the steam tables by Keenan and Keyes (1959) as 

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