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SECOND TEST MATURITY '2013 - svolgimenti AND SOLUTIONS. The students of the 'technical institute professional mechanic to address the maturity steam pressure temperature of 2013 touched a second test on the fluid machines. The maximum time to perform the test is 6 hours and throughout the script you can use 'use of numerical tables, technical manuals and non-programmable calculators. We focus on the situation of what is a fluid machine is a machine that is primarily through the conversion of forces steam pressure temperature applied to a compressible fluid (gas, steam) or incompressible (liquid).
The energy is obtained by fuels that cause pollution. In a project of fluid machines the goal is to maximize returns while minimizing pollution and energy consumption. steam pressure temperature
The fluid machines can be classified as follows: - Under the direction of energy transfer between the fluid and machine: the operating and driving - Depending on the type of process steam pressure temperature fluid (r = density) and thermal hydraulics - Depending on the mode of working fluid: volumetric and dynamic
Comment
With regard to points 1, 2, 3, spoiled for choice, books and manuals are full. From the Mollier diagram for pressure p = 45 bar and a temperature T = 623-273 = 350 C is the enthalpy for the point 3 h3 = 3100 kJ / kg. Going vertical (adiabatic expansion in the turbine) steam pressure temperature intersects with the pressure p = 0.5 bar condenser section 4 that the enthalpy h4 = 2250 kJ / kg The enthalpy of the initial point 1, is located at: h1 = c T1 where T1 = T4 from the diagram Molliere T1 = 80 C h1 = 4.186 80 = 335 kJ / kg Well, now we can solve. Step 4. The efficiency of the thermodynamic cycle (ideal system) is ni = (h3-h4) / (h1-h3) steam pressure temperature = (3100-2250) / (3100-335) = 0.31 = 31% Punto5 The missing data is the efficiency of the steam turbine that can take as teaching nt = nt = 0.9 From Pu / John (h3-h4) steam pressure temperature is Pu = nt Jn (h3-h4) Pu = 0.9 20000 (3100-2250) = 15300000 steam pressure temperature kJ / h = 15300000/3600 = 4250 kW Peace and good health and fortune
The characteristics of the test, the notes to prepare, exercise ... Continue Applied mechanics and fluid machines, depending on the test track in 2012
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