Thermal design of a passive building is closely interrelated to the architectural design of the structure itself, there is a spectrum of methods for estimating long-term thermal performance of these buildings that ranges from practical experience using of charts and tables that are based on combinations of experience and calculations to correlation and useful methods that are the counterparts of the methods for active systems. The design method to be described in more details in the following, have common basic feature. It uses the correlations of result of simulations to determine long-term performance. The correlating variables, the definitions of terms, the ways in which the correlations are used are however very different from one to another. In this paper the unutilizability method design collector-storage wall will illustrate in details.

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