How will the outlet temperature of water be affected if water at a constant temperature of 15 degree Celsius is made to flow through the gap between the inner tube and the outer tube?

Consider a flat plate collector without the vacuum section.  Compare the thermal efficiency of such a flat plate collector with the values you obtained while performing this experiment using calculation.

Justify the placement of flat plate collector facing south. Will keeping it facing North, East or South influence its efficiency?

Find out the quantitative contributions of heat via radiation, convection and conduction in heating of the fluid.