Above mentioned researchers are to involve the efficiency of solar heaters. Solar heating system has number of applications as indicated above.
However, its operation is to be optimized to a level which acceptable solar heater and must be developed with highly efficient lights absorbing materials properly assembled.
Multi-pass system has been incorporated positively in solar heating system to increase conversion efficiency.
It is important to point out that 70% thermal conversion efficiency has been noted in a solar air heater made up of broken glass pieces with doubleglazing.
Different configurations of solar heaters with number of material specifications have been investigated to increase efficiency of solar heating system.