Comparative field performance study of concentrator augmented array with two system configurations

The paper describes the system and experimental evaluation of an evacuated tube heat pipe collector array augmented with a novel design internal concentrator having a direct flow absorber and tested in the north–south and east–west align configurations under real outdoor conditions. External and internal concentrators have the potential to supply higher generator inlet temperatures needed for solar driven cooling systems. However, internal concentrator augmented solar collectors can further reduce heat losses and increase output temperatures. It is shown that collector outlet temperatures of 110°C or more is possible and can be efficiently used to drive solar cooling systems with higher coefficient of performance (COP). The evacuated tube collector array augmented with a novely designed internal concentrator having a direct flow absorber in the north–south alignment was found to be more energy efficient with larger temperature lift and outlet and inlet temperature differential and substantial improvement in thermal performance compared to its east–west align configuration due to shorter connection piping connecting the internal concentrator augmented CPC to the evacuated tube heat pipe collector array.