With rising energy costs and an ina-easing demand for renewable energy sour
ces, thermal energy storage (TES) systems are becoming an interesting optio
n. TES is a key component of any successful thermal system and a good TES s
hould allow, minimum thermal energy losses. In this study, various ways of
thermal conservation are outlined and discussed, both theoretical and exper
imental. In this respect, the TES systems and their practical applications
and some selection criteria have also been given.