. 2020 Aug 24;135:110254. doi: 10.1016/j.rser.2020.110254

Table 2.

The governing equations of PV/T with MWCNT system [62].

Description	Equations
PV/T system	$ρ_{n f} (u \frac{\partial u_{i}}{\partial x} + ν \frac{\partial u_{i}}{\partial y} + ω \frac{\partial u_{i}}{\partial z}) = - \frac{\partial p}{\partial x} + μ_{n f} (\frac{\partial^{2} u_{i}}{\partial x^{2}} + \frac{\partial^{2} u_{i}}{\partial y^{2}} + \frac{\partial^{2} u_{i}}{\partial z^{2}})$ ${(ρ C_{p})}_{n f} (u \frac{\partial T_{n f}}{\partial x} + ν \frac{\partial T_{n f}}{\partial y} + ω \frac{\partial T_{n f}}{\partial z}) = k_{n f} (\frac{\partial^{2} T_{n f}}{\partial x^{2}} + \frac{\partial^{2} T_{n f}}{\partial y^{2}} + \frac{\partial^{2} T_{n f}}{\partial z^{2}})$
PV/T received energy from module surface	$E_{r} = τ_{g} α_{s c} P_{s c} G A$
PV/T electrical energy output	$E_{p} = η_{s c} P_{s c} τ_{g} α_{s c} P_{s c} G A [1 - μ_{s c} (T_{s c} - T_{r})]$
PV/T thermal energy output	$E_{t} = m C_{p n f} (T_{out} - T_{in})$
PV/T electrical-thermal-overall efficiency	$η_{e} = \frac{E_{p}}{E_{r}}$ , $η_{t} = \frac{E_{t}}{E_{r}}$ , $η_{o} = \frac{E_{p} + E_{t}}{E_{r}}$