7755 Heat

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Uploaded: 22.07.2013
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Objective 1
A mixture consisting of the M1 and M2 kmol nitrogen kmol oxygen with initial parameters P1 = 1 MPa, T1 = 1000 K expanded to a pressure P2. The extension can be carried on the isotherm, adiabatic and polytropic with the index n.
Determine the gas constant of the mixture, its weight and the initial volume, the final parameters of the mixture, the work of expansion, the heat involved in the process, change in internal energy, enthalpy and entropy. Writing a summary table of the results and analysis of it. Show processes pv- and TS-diagrams.
M1 = 0.9 kmol; M2 = 0.1 kmol; P1 = 1 MPa; P2 = 0.57 MPa; T1 = 1000 K; n = 0,8
Task 2
1 kg of water vapor at an initial pressure P1 and the degree of dryness x1 expands isothermally; while it is supplied to the heat q.
Determine, using the IS-diagram parameters of the final status of the pair, the work of expansion, change in internal energy, enthalpy and entropy. Solve the problem as if the expansion is isobaric. Depict processes pv-, TS and IS-charts.
P1 = 7 MPa; x1 = 0.92; q = 470 kJ / kg
Objective 3
The gas flow rate in a single-stage reciprocating compressor is at a pressure P1 V1 = 0.1 MPa and a temperature t1. During compression, the gas temperature rises to 200 0C. Compression occurs with polytropic index n.
Determine the final pressure, the compression work and the work of the compressor drive, the amount of heat abstracted (in kilowatts), and the theoretical capacity of the compressor drive.
V1 = 60 m3 / min = 1 m3 / s; gas - not; n = 1,5; T1 = 0 C 25 = 25 + 273 = 298 K; T2 = 225 0 C = 225 + 273 = 498 K; μ = 4; P1 = 0.1 MPa
Task 4
Identify the needs of the surface of the regenerative heat exchanger in which water is heated by the hot gases. Calculation for a co produce and counter-schemes. Bring the temperature graph for both traffic patterns. The temperatures and gas t'1 t''1, water and t'2 t''2, water flow and heat transfer coefficient M K
For gas ρ = 1,293 kg / m3 Cp = 1005 J / kg K, water Cp = 4.19 x 103 J / kg K. t'1 = 500 0C; t''1 = 350 0C; t'2 = 10 0C; t''2 = 120 0C; M = 0,7 kg / s; K = 44 W / m2 K
Task 6
Determine the power indicator Ni-stroke internal combustion engine in its design parameters and mean indicated pressure. The value of the diameter of the engine cylinder D, stroke s, the angular velocity of the crankshaft ω, the number of cylinders z and mean indicated pressure Pi.
D = 100 mm; s = 118 mm; ω = 2600 min-1; z = 8; Pi = 860 kPa


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