Symbol
|
Description
|
Units
|
|
PV cell Area
|
m2
|
|
Cross-sectional area of the reservoir (assuming unit depth)
|
m2
|
|
Heat capacity at constant pressure
|
J/(kg*K)
|
|
Specific heat of water
|
4.18 J/(g*C)
|
|
Hydraulic diameter
|
m
|
|
Total solar energy into the cell
|
W
|
|
Electrical energy
|
W
|
|
Thermal energy extracted by water
|
W
|
|
Forced convection heat transfer coefficient
|
W/m2
|
|
Maximum power point current
|
A
|
|
Thermal conductivity
|
W/(m*K)
|
|
Mass of water
|
g
|
|
Electrical power out of PV cell
|
W
|
|
Flow rate of water
|
ml/s
|
|
Heat flux
|
W/m2
|
|
Heat source
|
W/m2
|
|
Convective heat loss
|
W
|
|
Heat flux going into PV cell
|
W/m2
|
|
Heat or energy into PV cell
|
W
|
|
Longwave energy
|
W
|
|
Heat or energy out of PV cell
|
W
|
|
Shortwave energy flux
|
W/m2
|
|
Shortwave energy
|
W
|
|
Solar irradiance
|
W/m2
|
|
Reynolds Number
|
[ ]
|
|
Temperature
|
K
|
|
Ambient temperature
|
K
|
|
Water inlet temperature
|
K
|
|
Water outlet temperature
|
K
|
|
Temperature of PV cell
|
K
|
|
Reference temperature
|
K
|
t
|
Time
|
seconds
|
|
Inlet water flow velocity
|
m/s
|
u
|
Fluid velocity
|
m/s
|
|
Maximum power point voltage
|
V
|
|
Temperature coefficient at reference temperature
|
1/K
|
|
Surface emissivity
|
[ ]
|
|
Average cell electrical efficiency
|
[ ]
|
|
PV cell electrical efficiency
|
[ ]
|
|
Total PV/T panel efficiency
|
[ ]
|
|
Thermal efficiency of the cell
|
[ ]
|
|
PV cell electrical efficiency at reference temperature
|
[ ]
|
|
Dynamic viscosity
|
Pa*s
|
|
Density
|
kg/m3
|
|
Stefan-Boltzmann constant
|
5.67e-8 W/(m2*K4)
|
|
Kinematic viscosity of water at 25 C
|
9.137e-7 (m2/s)
|
