“…The motivation for using phase-change energy storage (PCES) is the reduction in storage volume which can be achieved compared to sensible heat storage. Therefore, we used commercial calcium chloride hexa-hydrate as a PCM, for solar energy storage because it is cheaper and has better thermal stability than the other PCMs (GuK ltekin et al 1991;Parisini, 1988;Carlsson et al, 1979;Abhat, 1983;Kaygusuz, 1995a;Hahne, 1996;Dinier and Dost, 1996). It is a commercial grade material produced by the Dow Chemical Company.…”