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Abstract: Energy supply to Iran requires the substitution of an energy model based on fossil by one based on renewable energy sources. The building sector, about 40% of total annual energy consumption, has an important share in energy demand in Iran. Iran as a Middle Eastern country has recently begun to use renewable energies. Solar energy, because of its availability and large number of sunny days in this country, is mostly concentrated. In this paper vented thermal storage wall that is used for heating of Isfahan buildings, Central of IRAN, are studied. The heating loads for a residential building which has about 800m2 floor area at four floor are calculated. Then the vented thermal storage wall are designed and the amount of annual energy saving is calculated. It is shown that more than 60 percent of winter energy consumption will saved by using this system. [Copyright &y& Elsevier]