European Journal of Scientific Research - EuroJournals

Modeling and Temperature Controller Design for Yazd Solar Power Plant 889
VI. Nomenclature
Figure 6: The Variation of delay in effect of flow variation
ρ s Density of oil pipe (kg/m 3 )
•
q Oil flow (m 3 /s)
Cs Specific thermal capacity of oil pipe (J/kg ºC)
G Width of collector (m)
As Area of metal pipe (m 2 )
Ht Heat transfer coefficient from pipe to oil (W/m 2 ºC)
ρ f
3
Density of oil (kg/m )
L Inner diameter of oil pipe (m)
C Specific thermal capacity of oil (J/kg ºC)
f
I Sun direct radiation (W/ m 2 )
V Volume of fluid path (m 3 )
•
m Mass flow of fluid(kg/s)
Af Inner cross area of oil pipe (m 2 )
Tf
Tf
Oil temperature along one collector (ºC)
- Oil temperature along previous collector (ºC)
Ts Temperature of oil pipe (ºC)
η Optical efficiency of mirrors
opt
x Distance of sensor from control valve (m)
HL Thermal loss coefficient (W/m 2 ºC)
v Oil velocity (m/s)
ρ Fluid density(kg/m 3 )
Flow (m 3 /s)
Q
A cross area of fluid pipe (m 2 )