Evacuated tube collector (ETC), with 14 heat pipes, an absorber area of 2.0 m2 and a diameter of heat pipe of 8.0 mm was compared to a copper HPs (MT 58-1800).
Evacuated tube collector (ETC), with 14 heat pipes, an absorberarea of 2.0 m2 and a diameter of heat pipe of 8.0 mm was comparedto a copper HPs (MT 58-1800).