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PEM Fuel Cells by Ken S. Chen, Yun Wang

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Appendix II.A

Thermodynamic Properties of Air, Hydrogen Gas, and Water Vapor*

Table A.2-a1. Ideal-gas properties of air (k: 1.406 – 1.392)

T

(K)

H

(kJ/kg)

U

(kJ/kg)

S**

(kJ/(kg K))

Cp*

(kJ/(kg K))

Cv*

(kJ/(kg K))

230

  232.0409

  165.5811

1.776346

0.9939

0.7069

240

  242.1921

  172.9011

1.789524

0.9952

0.7082

243

  245.2402

  175.0744

1.793309

0.9956

0.7086

250

  251.7154

  180.1442

1.802048

0.9966

0.7096

260

  262.4987

  187.4031

1.814533

0.9980

0.7110

270

  272.6462

  194.6583

1.826454

0.9994

0.7124

273

  275.6964

  196.8337

1.830082

0.9998

0.7128

280

  282.8037

  201.9056

1.838426

1.0008

0.7138

290 ...

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