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/ 6/ 5 +0- 4F < + 4 = W-5 -/ W< D Z 0 ?/ A +@ <kW 633 [F .<

),- (A (5: 6/ / A 5 AH9 > @ ?/+GF5 +G.

Energy and Exergy Analysis of a Tri-Generation System based on Ammonia-Fed Solid Oxide Fuel Cell

Faculty of Mechanical Engineering, Urmia university of Technology, Urmia, Iran M. Hassani Rikani Department of Mechanical Engineering, Urmia university, Urmia, Iran Sh. Khalil Aria Faculty of Mechanical Engineering, Urmia university of Technology, Urmia, Iran V. Zare

Abstract In this research, a tri-generation system based on ammonia fed solid oxide fuel cell is proposed and investigated. This study involves thermodynamic modeling of the fuel cell to conduct energy and exergy analysis of the system components in order to evaluate the energy and exergy efficiencies of the tri-generation system. In the proposed system, a solid oxide fuel cell with hydrogen-proton conducting electrolyte is used as the prime mover, which has the best performance for ammonia-fed fuel cells based on the reported results in the literature. The effects of important parameters such as current density, operating temperature and pressure are investigated on the performance of the proposed tri-generation system. Based on the results, assuming 1073 K and 505 kPa for the fuel cell working conditions, the energy utilization factor and exergetic efficiency of the proposed system are calculated to be 108.9% and 75%, respectively and overall output power is increased 633 kW by using tri-generation system instead of fuel sell stack only, regardless of the cooling and heating load produced. Keywords: Tri-Generation System, SOFC, Ammonia, Energy and Exergy Analysis.

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3 Open-circuit 4 Closed-Circuit 5 Effective Diffusion 6 Triple Phase Boundary

61

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1 Exergy destruction

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2 Engineering Equation Solver

62

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85/0 U 25/0 U8 5 (pr) -

250 A [m2] 7060 J 'AK*

7 10 pABp! pABp! exp (> 10 ) J!,- 'AK*

7 10 p8p! !. exp (> 130000 ) J!,. 'AK* 500 τ- [µm]

10 τ. [µm]

30 δ [µm]

735/0 RG [Ωm]

000001537/0 D- 'm KC*

0000015/0 D. 'm KC*

/ 6/ < bF0, +HTO bk-5

85 η. [%]

90 η [%]

90 ηA [%]

95 ηp [%]

98 ηijk [%] 80 ηW [%]

/ 6/ J +< < bm 5

298 T9 [K] 3/101 p0 [kPa]

21% B [%]

79% lB [%]

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= [. = T

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/]12[. A= < @ <90< _m [J < ?/ D +5 70F % 4 [90 4 %+GF5 ?/ A26 %

4+GF5 / 6/ 572 [J %.< C@ 2 = - 8 T ?

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[F .<

J- 2- d,24 12 0 E efD g9 :E2. +

6/ c8 p [kPa] T [K] d [mol/s] d [kW]

/

6

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=

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1 505 6/277 175/7 2468 2 505 1/509 175/7 2483

3 505 3/647 175/7 2504 4 505 2/781 11/87 870 5 505 1073 202/5 59/446

6 505 1073 68/91 1552 7 505 1193 08/96 1930

8 101 843 08/96 72/740

9 101 298 11/87 249/11 10 505 500 11/87 82/481 11 101 6/821 08/96 034/698 12 101 4/540 804/4 05/11

13 101 9/560 276/91 455/236 14 101 9/559 08/96 48/247 15 101 3/538 08/96 286/218

16 101 2/364 08/96 664/50 17 101 2/298 1000 9500 18 101 2/313 1000 9513

25 101 2/113 7/348 86/48 26 101 2/298 7/348 027/45

.

5w :

?S

19 77/35 365 8754/0 4758

20 2000 6/365 8754/0 4760 21 2000 553 8754/0 4785

22 77/35 2/479 8754/0 4773 23 101 2/313 99/50 8/485

24 101 2/328 99/50 85/489

/ </ 6/ +GF5 AH9 D /< L -

?/ A A? +GF5 _ :-< +0- 5 \ @ +J [ OT, A < : .J

+) -5< bQR ?/ A 5 o, T=4 D = a +GF5 _ :-< +1< . /J

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/ 6/ bF0, 4- +0- 5.J

)(

()

65

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C@ 3 - O +J 8/ 6/ +HT < 5

/ C@ +J1 103 × 816/1 Wd lmn [kW]

3/152 Qd o//70, [kW]

3/505 Qd y [kW]

103 × 183/1 Wd ef [kW]

9/108 η [%]

81/74 ψ [%]

2/29 ηo [%]

2/27 ψo [%]

92/79 η [%]

46/74 ψ [%]

/ 10 - ,* h:.f ()*+, E F,* 0 12 +

(ED

6 - (.+ / 6/ +GF5 +G AH9 D /< L -

4- +0- 5 + v= 9 JK 1073 kPa 505 9 < Am-2 7060 ?/ A 4@ 3S 4O <

A<; 8 / ; 6/ @%9/108 0< 4O < -

+G D +5%81/74 H D< 4O <+GF5 .J 4- L+HTO v= : J < ?/ A A <

/ 6/ 8 +0- 5kW 3/152 -/ W<kW 3/505 = m W-5< + 4 F 6/

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