Jets of high-speed steam are used in spray cleaning. Steam

Chapter 7, Problem 7.38

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Jets of high-speed steam are used in spray cleaning. Steam at 15.0 bar with 150a C of superheat is fed to a well-insulated valve at a rate of 1.00 kg/so As the steam passes through the valve, its pressure drops to 1.0 bar. The outlet stream may be totally vapor or a mixture of vapor and liquid. Kinetic and potential energy changes may be neglected. (a) Draw and label a flowchart, assuming that both liquid and vapor emerge from the valve. (b) Write an energy balance and use it to determine the total rate of flow of enthalpy in the outlet stream {-ri,,"! = tn,{!i t- rnvH. ;. Then Ce[e;-mine whether the outlet stream is m L,ct it mixture of liquid and vapor or whether it is pure vapor. Explain your reasoning. (c) What is the temperature of the outlet stream?