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Analysis of a solar assisted micro-cogeneration ORC system 261 1 k =1-0.136⋅cosi -1 (4) For incidence angles higher than 80o, solar contribution was set to zero. For cycle 2, solar collector efficiency was calculated through, [8]: η=η -1⋅Tin -Tamb (5) 0 I In this case, the dependence of optical efficiency (h0) on incidence angle (i) is expressed by: η0 = 0.61+ 0.002⋅i for i ∈[0,35] η0 = 0.628 - 0.009⋅i for i ∈[35,67] (6) 0 for i ∈[67,180] After obtaining the heat required to generate 5 kW of electricity (Q. ), it is possible input to determine the solar contribution by a thermal balance. Solar fraction (f) represents the percentage of energy input in the micro-cogeneration system that is due to solar energy. The fluid in the primary circuit is cyclohexane with water in the secondary circuit. The monthly average solar fraction depends on the total heat transferred between fluids in the heat exchanger (QHX) and Qinput: f = QHX = QHX (7) Qinput Qboiler +QHX When the solar collectors are directly connected to the heat exchanger (without storage tank), QHX is equal to the useful energy gain in the solar collector (Qsolar). The useful solar input (instantaneous) is calculated through: Qsolar =(mcp)water(Tout -Tin) (8) For cycle 1 and with cyclohexane as the.fluid in the primary circuit, the power required to generate 5 kW of electricity (Q ) is equal to 75.2 kW (see Table 1). . For cycle 2, Q is equal to 40.4 kW (see Table 3). input It was assumed that the heat exchanger thermal efficiency was constant (75%), operating in single-phase or two-phase mode. When using the storage tank, water and cyclohexane flow rates in the heat exchanger are the same. Figure 3 shows the annual average solar fraction for different collector areas, for the 3 cities and for cycle 1. Due to utilization of the thermal storage tank, the system International Journal of Low Carbon Technologies 3/4 inputPDF Image | Analysis of a solar assisted micro cogeneration ORC
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