Modeling and Characteristic Analysis of a Solar Parabolic Trough System: Thermal Oil as the Heat Transfer Fluid

Table 2

Main physical and chemical characteristics of THERMINOL VP-1 [4].

Composition	Diphenyl oxide/diphenyl
Appearance	Clear/sediment free liquid
Maximum temperature	400°C
Kinematic viscosity (40°C)	2.48 mmm^2/s
Density (15°C)	1068 kg/m^3
Fire point	127°C
Autoignition temperature	621°C
Pour point	12°C
Normal boiling point (1013 mbar)	257°C
Coefficient of thermal expansion (200°C)	0.00097/°C
Average molecular weight	166