Old spec Tutorial 1 Problem 6 (ENGR5003) - Revisica

Old spec Tutorial 1 Problem 6TutorialOld spec ENGR2172:215 min

ENGR217 (old spec) Thermo L6 Tutorial 1, Problem 6 official answers

Using the steam tables, complete the following table for water (blanks marked "?").

	T (C)	p (kPa)	u (kJ/kg)	x	Phase description
(a)	?	200	?	0.4	?
(b)	150	?	1800	?	?
(c)	?	1200	2955.5	?	?
(d)	75	500	?	?	?
(e)	?	850	?	0	?

Formulas you may need

Wet steam: $u = (1 - x)u_f + xu_g$ , so $x = \dfrac{u - u_f}{u_g - u_f}$ (on the formula sheet)
Phase test: compare the given $u$ (or $T$ ) with $u_f$ , $u_g$ (or $T_{sat}$ ) at the given pressure or temperature (learn this)
Compressed liquid: $u \approx u_f(T)$ (learn this)

(a)
Row (a)
T =C
u =kJ/kg
(b)
Row (b)
p =kPa
x =-
(c)
Row (c)
T =C
(d)
Row (d)
u =kJ/kg
(e)
Row (e)
T =C
u =kJ/kg

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