Question

Three return steam lines in a chemical processing plant enter a collection tank operating at steady state at 5 bar. Steam enters inlet 1 with flow rate of 1.4 kg/s and quality of 0.9. Steam enters inlet 2 with flow rate of 2 kg/s at 200°C. Steam enters inlet 3 with flow rate of 1.2 kg/s at 95°C. Steam exits the tank at 5 bar. The rate of heat transfer from the collection tank is 40 kW.
Neglecting kinetic and potential energy effects, determine for the steam exiting the tank:
(a) the mass flow rate, in kg/s.
(b) the temperature, in °C.

Answer 1

ARVIND P. No. Dt. Mass balance mtnm t m3 .4 1.2 m4 46 -Us ing Table A-3 ot P 56ar and 0-9 Saturated water 2537.88 Usi ng Table H-Superheated at P= 5 bar and T2 =200 2855.4 Table A-2 Saturated csater Using at T=95 C Liquid Isubcasled 397.96 J n lance —.D- 4и tучи t yш (397-96) my h4 I(2537-88)+ 2(2955.4) t 1-2 40 kalkg hy = 2108.9 Table A-3;at P= 56ar Tsat he - Using 151-C amd 6ИО.23 2748-7 hg

he hyhg ies between at. Laud State-4 amd Sat. vafOr Saturated mixture State- 4 sat 151-9 C Jer Им