Liquid heating collectors are mainly used for _________

_______ is a glazing which limits the radiation and convection heat losses.

What are provided to minimize heat loss?

Which part of flat plate collectors is coated in black?

In which collector does air flow without any obstruction?

Which type of absorber increases the heat transfer area over a simple flat plate absorber of the same capacity?

In what form is solar energy is radiated from the sun?

The scattered solar radiation is called ____________

Angle made by plane surface with horizontal is called ________