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International Journal of Computer and Electrical Engineering, Vol. 5, No. 2, April 2013 III. CALCULATION MODEL OF THE SOLAR-OTEC SYSTEM As mentioned above, three configuration cases are chosen to be calculated. And the corresponding flow chart is given here as shown in Fig. 2. Fig. 2. Flow chart of Kalina Solar-OTEC calculation procedure A. Kalina Solar-OTEC Case 1 In this case, Solar-Evaporator 1 is effective. That is to say, the Solar-Evaporator 1 is directly connected with the solar collector pump and solar collector, or, the solar collector subcycle is a-b-c-h-i-j-a, as shown in Fig. 1. By using the heat balance of the evaporator, that is, the heat transfer rate absorbed from seawater Qe mwscP(twsi twso) is equal to ( t Fig. 2. In a similar way, the cold seawater temperature at the combinedwith y y and P P inthiscase,thestateof 11 7 11 7 point 11 will be solved here. And through the heat balance in Solar-Evaporator 1, the temperature tc is solved as following (1) thatsuppliedtothecycleQm(hh),thewarm t t e Q s e m s w f c p s e 22 UA se1 t t t e Q s e 1 m s w f c p c 11 7 s e 1 mc Qtt 117 Q swf p Meanwhile, tb ta Qse1 /(mswf cp)tc and Qse1 Qs . UA Qse1 seswfp /1eQ 1m c t11t7 Hereby, twso , tcso , P6 and P2 are assumed as iteration variables in this case (Fig. 2). And the corresponding Thus according to the given initial condition, the state of the system points could be found by iterative calculation. And the thermal efficiency of the Kalina Solar-OTEC in this case constraint functions are Qe Qewf , Qc Qcwf , (UA/Q)c given and (UA/Q)rg given , respectively. can be given asksotec,case1 Wnet,case1 /Qe,case1 , in which, W m ( ( h h ) ( h h ) ) net,case1 wf 1 11 12 3 2 Q e , c a s e 1 m w f ( h 5 h 4 ) m w f 1 ( h 1 1 h 7 ) . , For case 2, Solar-Evaporator 2 is effective, which means that the solar collector subcycle is a-d-e-h-i-j-a. In this case, the calculation approach for most points is same with that of case 1 except some special points, such as point 11, which has same properties as point 7 since there is no Solar-Evaporator 1 here. In addition, there is also no Solar-Evaporator 3 here, so twss twsi . Meanwhile, by using the heat balance in the Solar-Evaporator 2, the enthalpy of point 6 can be given as h6 h5 Qse2 /mwf . And combined with the given y6 and P6 in this case, the state of point 6 will be obtained. And through heat balance in Solar-Evaporator 2, the temperature te can be solved as following t e B. Kalina Solar-OTEC Case 2 Q UA se 2t6t5 Q ewf wf 5 4 seawater temperature at the outlet of the heat exchanger swf p (2) ) can be calculated with iterative solution as shown in Q UA se wso outlet of the heat exchanger ( t Furthermore, in this case, leave the influence of solar collector pump to temperature out of consideration, which means that tc th ti tj . In addition, by using the heat balance in the Solar-Evaporator 1, the enthalpy of point 11 canbegivenash11h7Qse1 /(1mwf),1m7/m5.And 2 t6t5 seswfp cso ) can also be solved here. /1eQ 2m c 189 65 mc Meanwhile, td ta Qse2 /(mswf cp)te and Qse2 Qs . Thus, the thermal efficiency of the Kalina Solar-OTEC in this case can be given as ksotec,case2 Wnet,case2 /Qe,case2 , inPDF Image | Energy-Economic Analysis and Configuration Design of the Kalina Solar-OTEC System
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