The EC is searching for standardized methodologies for the assessment of thermal parameters for different types of building components. Dynamic system identification techniques are the most promising methods to achieve this goal. Development of assessment procedures and guidelines is one of the objectives of the EC. Within the frame of the DGXII PASSYS project the work by the participating teams has been concentrated on the development of reliable parameter identification methods. Methods developed in the subgroup Test Methodologies of the PASSYS project are based on a lumped parameter model and a continuous time model, modal models and armax models. The application of identification methods on "in-situ measurement of the thermal resistance and thermal transmittance" will be discussed. A performance check for these methods will be presented, which includes tests on noise, change of input signal by uncontrolled phenomena and non linear parameter behaviour. The application of several methods will be discussed in referenced papers. CEN TC89/WG8

CEN, Commitee Europeen de Normalisation, is organised through Technical Committees. The area of CEN/TC 89 is on Thermal Performance of Buildings and Building Components. Working Group 8 of the CEN/TC89 deals with Thermal Test Methods [5]. Its scope is to deal with standards on test methods for determining thermal properties of building materials, products and components, including the insulation of equipment. In the task is included consideration of accuracy levels appropriate to the subsequent treatment of results and guidleines to assess the apparatus and testing procedures used by laboratorie s.

• measurement: thermal properties