Steam Tables Practice Examples

STEAM TABLES PRACTICE EXAMPLES Using your Thermodynamic Properties of Fluids Tables, determine. 1. 2. 3. 4. 5.

The specific enthalpy of: i. Saturated water at a temperature of 130oC, ii. Dry saturated steam at a temperature of 130oC The saturated water pressure, and the dry saturated steam pressure at 130oC The specific volume of dry saturated steam at a pressure of 2.7bar. The specific enthalpy of steam at a pressure of 2.7 bar and a dryness fraction of 0.9. The specific enthalpy of steam at pressure of 20bar and a temperature of 400oC

SOLUTION Page 5 of tables: 1.i

Under column: ts read down to 130.0, read across under column hf = 546 kJ/kg.

ii

Under column: ts read down to 130.0, read across under column hg = 2720kJ/kg.

2.

"

3.

"

"

" p

" "

p = 2.7bar.

2.7 bar, read across under column vg = 0.6686m3/kg.

4. hwet = hf + xhfg hwet = 546 + 0.9 x 2174 2502.6kJ/kg Ans 5.

The saturation temperature for steam at 20bar is 212.4oC. In this case the steam is above its saturation temperature it must therefore be superheated steam. Page 8 of tables. Under column: p read down to 20, read across to h and under column 400 = 3248kJ/kg

Determine the following specific enthalpies. FLUID Boiling water Boiling water Saturated water Saturated water Dry saturated steam Dry saturated steam Steam Steam Steam Steam

STATE temperature = 165oC pressure = 5bar temperature = 195oC pressure = 1.6bar pressure = 11bar temperature = 165oC p = 5bar, dryness = 0.8 ts = 128.7oC, dryness = 0.95 p = 30bar, temp. = 350oC ts = 250.3oC, temp.= 400oC

Determine specific volumes for: FLUID Steam Steam Dry saturated steam Dry saturated steam Steam Steam

STATE p = 6bar, dryness = 0.9 ts = 250.3oC, dryness = 0.88 p = 30bar ts = 195oC p = 40bar, temp = 450oC ts = 263.9oC, temp = 500oC

ANSWER

(kJ/kg)

ANSWER

(m3/kg)