AME 3363 - University of Oklahoma



AME 3363 Information Sheet

Properties of Water (Liquid-Vapor)

v = (1 - x)vf + xvg = vf + x(vg - vf)

u = (1 - x)uf + xug = uf + x(ug - uf)

h = (1 - x)hf + xhg = hf + x(hg - hf)

s = (1 - x)sf + xsg = sf + x(sg - sf)

Ideal Gases

pv = RT, pV = mRT, k = cp/cv, cp = cv + R

Rair = 0.287 kJ/kg(K, kair= 1.4

Steady-Flow Processes

[pic] (Conservation of Mass)

[pic] (Conservation of Energy)

Isentropic Processes

[pic] (constant specific heats)

[pic] [pic] (variable specific heats)

Ideal Otto Cycle

1-2 isentropic compression

2-3 constant-volume heat addition

3-4 isentropic expansion

4-1 constant-volume heat rejection

Ideal Diesel Cycle

1-2 isentropic compression

2-3 constant-pressure heat addition

3-4 isentropic expansion

4-1 constant-volume heat rejection

Ideal Brayton Cycle

1-2 isentropic compression

2-3 constant-pressure heat addition

3-4 isentropic expansion

4-1 constant-pressure heat rejection

Ideal Rankine Cycle

1-2 isentropic compression

2-3 constant-pressure heat addition

3-4 isentropic expansion

4-1 constant-pressure heat rejection

Vapor Compression Refrigeration Cycles

1-2 Isentropic compression in a compressor

2-3 constant-pressure heat rejection in a condenser

3-4 throttling in an expansion valve

4-1 constant-pressure heat absorption in an evaporator

Performance [pic]

Isentropic Efficiency

[pic] (Turbines)

[pic] (Compressors, pumps)

Atmospheric Air

Specific humidity [pic]

Relative humidity [pic]

Total Pressure P = Pa + Pv

Total Enthalpy h = ha + ωhv

Dew Point TDP = Tsat@Pv

Thermal Resistance [pic] (plane walls), [pic] (cylindrical walls)

Heat Exchangers

Q = UA (LMTD) = mcp(To - Ti), LMTD = [(ΔTi) - (ΔTo)] / [ ln(ΔTi /ΔTo)]

(LMTD)cross-flow = F (LMTD)counter-flow

F = function of (P, R)

P = [t2 – t1] / [T1 – t1], R = [T1 – T2] / [t2 – t1],

[pic], [pic]

[pic] [pic]

Boiling and Condensation

Nucleate Pool Boiling [pic]

Critical Heat Flux [pic]

Minimum Heat Flux [pic]

Film Boiling for Cylinders [pic]

Total Heat Transfer in Film Boiling [pic]

Wave-Free Film Condensation [pic] Re ≤ 30

[pic]

Wavy Film Condensation [pic] 30 < Re < 1800

[pic]

Film Condensation over Horizontal Tubes

[pic]

AME 3363 – HW # 8

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