MET 211 Steam tables practice_examples
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The document provides examples of using steam tables to determine thermodynamic properties of fluids including: 1) Specific enthalpies of saturated water and steam at 130°C and pressures of 2.7 bar. 2) Saturated water and steam pressures at 130°C. 3) Specific volume of dry saturated steam at 2.7 bar. 4) Specific enthalpy of steam at 2.7 bar with 90% dryness fraction. 5) Specific enthalpy of steam at 20 bar and 400°C.
MET 211 Steam tables practice_examples
- 1. STEAM TABLES PRACTICE EXAMPLES Using your Thermodynamic Properties of Fluids Tables, determine. 1. The specific enthalpy of: i. Saturated water at a temperature of 130oC, ii. Dry saturated steam at a temperature of 130oC 2. The saturated water pressure, and the dry saturated steam pressure at 130oC 3. The specific volume of dry saturated steam at a pressure of 2.7bar. 4. The specific enthalpy of steam at a pressure of 2.7 bar and a dryness fraction of 0.9. 5. 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. " " " " p = 2.7bar. 3. " p " 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 STATE ANSWER (kJ/kg) Boiling water temperature = 165oC Boiling water pressure = 5bar Saturated water temperature = 195oC Saturated water pressure = 1.6bar Dry saturated steam pressure = 11bar Dry saturated steam temperature = 165oC Steam p = 5bar, dryness = 0.8 Steam ts = 128.7oC, dryness = 0.95 Steam p = 30bar, temp. = 350oC Steam ts = 250.3oC, temp.= 400oC Determine specific volumes for: FLUID STATE ANSWER (m3/kg) Steam p = 6bar, dryness = 0.9 Steam ts = 250.3oC, dryness = 0.88 Dry saturated steam p = 30bar Dry saturated steam ts = 195oC Steam p = 40bar, temp = 450oC Steam ts = 263.9oC, temp = 500oC