Abstract
The solubility of MnSO 4 in water declines markedly as the temperature of the solution is raised. This effect can be used to coat the absorber plate of a solar collector with a layer of fine white crystals which scatter light away from the absorber if it exceeds a predetermined temperature. We have investigated the solubility limits of the ternary system MnSO 4H 2OC 2H 6O 2 and found that ethylene glycol, added to the mix, provided adequate antifreeze protection and also increased the coating ability of the solution. We also found that the kinetics of nucleation and crystallization for this system are so slow that it will remain indefinitely in the supersaturated state; crystals only precipitate upon the initiation of boiling.
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