Among the different possibilities for TES ,cold storage is attracting an increasing interest for different applications such as in HVAC systems , where cold storage can heip shift the peak loads decrease the operation costs and reduce the installed capacity. Published work has shown the benefits of cold storage for the HVAC in different buildings. In latter cases, the daily variation of the electricity tariffs are a key point to evaluate the economic benefits. In Spain for instance, depending on the electricity tariff, the cost of the electrical power consumption during off-peak hours at night can be less than half the cost during peak hours.