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# 116 177 Heat

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# Description

Examination number 1

4. Show how the work is determined by the reversible thermodynamic processes analytically and graphically in the PV-diagram

17. Draw in pv- TS-diagrams and thermodynamic processes in compressors. Why isothermal compression process gas in the process is energetically more favorable than the polytropic with n> 1?

Task 4

Find volume composition ideal gas mixture specified mass proportions: mCO2 = 14%, mH2O = 15%, mN2 = 45%, mO2 = 26%.

Determine also the partial pressures of components of a mixture, if the absolute pressure of the mixture p = 0.2 MPa

Target 13

In a closed vessel of 10 m3 are moist saturated steam with a pressure P = 1.2 MPa. The amount of steam contained 30 kg of liquid. To determine the mass of the vapor mass in the vessel and steam dryness.

Task 20

The wet saturated steam at a pressure p1 = 1.2 MPa enters the throttling calorimeter to determine the humidity. After throttling to the pressure P2 = 0.1 MPa steam temperature becomes equal to t2 = 131 0C. What moisture vapor to choke? As increases in specific entropy of steam throttling calorimeter? Solution of the problem is illustrated in the diagram is-

Problem 30

Determine how the initial pressure is lowered by throttling varies disposable heat drop and thermal efficiency of the Rankine cycle steam power plant, if the initial absolute vapor pressure p1 = 35 bar, temperature t1 = 420 0C and the pressure in the condenser installation 5 kPa. The pressure to which the steam is throttled, is p2 = 10 bar. Solution of the problem is illustrated in the diagram is-

Verification work number 2

4. Define thermal conductivity, heat transfer and heat transfer

18. In which case, the change in temperature heating medium in the heat exchanger will be greater than the heated and in which less?

Target 8

What is the thickness of the insulation steam pipe if the inner surface temperature = 200 0C t1st outer surface of the diameter d2 = 275 mm has a temperature of 50 0C = t2st? Thermal conductivity of insulation λ = 0,08 W / (mK). The heat transfer coefficient on the surface of the insulation to the surrounding air α2 = 15 W / (m2 K). Air temperature t2 = 20 0C

Target 17

Find the average heat transfer coefficient in film condensation of dry saturated vapor pressure p = 0.01 MPa approximately horizontal tube (diameter d = 0,03 m and a length l = 0,8 m), and having a surface temperature Tw = 15 0C. How many of these handsets will need to condense 500 kg of steam per hour?

Problem 27

Between two vertical flat plate size 0,5h0,5 m placed an electric heater with a uniform distribution of heat density. Emissivity surfaces ε = 0,45. What should be the capacity of the electric heater to at ambient temperature ti = 27 0 C to keep the temperature of surfaces plates Tw = 320 0 C, if the coefficient of heat transfer by convection to the air is determined by the equation:

αk = 2.65 (Tw - TV) 0.25

(Heat transfer plates are not taken into account)