Modeling and performance analysis of solar parabolic trough collectors for hybrid process heat application in Kenya’s tea industry using system advisor model

Sustainable Energy Research

Table 2 Design parameters and considerations

Parameter	Value
Site: Toror tea factory, Kericho Kenya
Longitude	35.297
Latitude	− 0.318
DNI	5.25 kWh/m²/day
Solar field
Design point DNI	476 W/m²
Total aperture reflective area	10,800 m²
Target receiver thermal energy	25,667 MWh
Loop temperature at field entrance	40 °C
Loop temperature at field exit	130 °C
Collector (EuroTrough ET150)
Reflective aperture area	817.5 m²
Length of collector assembly	150 m
Length of single module	12.5 m
Number of modules per assembly	12
Optical efficiency at design	0.871
Mirror reflectance	0.935
Optical efficiency at design	87.1%
Receiver tube (Schott PTR70)
Absorber tube inner diameter	0.066 m
Absorber tube outer diameter	0.07 m
Absorptance of absorber tube	0.96
Emittance of absorber tube	0.074
Thermal storage system
Heat transfer fluid (HTF)	Pressurized water
Loop inlet HTF temperature	40 °C
Loop outlet HTF temperature	130 °C
Heat sink
Heat sink	14,286 MWh
Pumping energy for HTF through heat sink	0.55 kW/Kg/s