Q3: Consider evaluation of different temperatures of solar photovoltaic/thermal system(PVT) as shown in Figure 1(a). The following set of differential equations representenergy balance equations to be solve using matrices and eigenvalues using MATLAB(or Octave):dTglass = -0.75Tolass + 0.75TpvtTdt(1)dTpyT= -dt1.18Tglass – 22TPVT + 23Twax(2)dTwax= 127glass + 18Tpyt – 19 Twaxdt(3)Where, Tatass, Tpyr, and Twax, are temperatures illustrated in Figure 1(b). At time t=0 the initialconditions are Tatass = 35 , TpyT = 33, and Twax = 31 °C.Call sepptyIa tree waterTankGlassPVTExpuNane PCMPVT CallectorTubTepeSterg Take MaNanouHest EschangerContainerTeketvaePumpfor draie(a)(b)Figure 1. (a) Schematic diagram of the nano-PCM and nanofluid PVT system, (b) mathematical model in context of thePVT collector: glass, PV, wax layer and tube coil, respectively [1].

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Q3: Consider evaluation of different temperatures of solar photovoltaic/thermal system (PVT) as shown in Figure 1(a). The following set of differential equations represent energy balance equations to be solve using matrices and eigenvalues using MATLAB (or Octave):