with enlarged surfaces, e.g. with protrusions or corrugations

Full Title

Solar heat collectors using working fluids > the working fluids being conveyed through tubular absorbing conduits > with enlarged surfaces, e.g. with protrusions or corrugations

Classification Context

Section:

MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

Class:

HEATING; RANGES; VENTILATING

Subclass:

SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS