Structural Analysis of Historical Constructions, New Delhi 2006 P.B. Lourenço, P. Roca, C. Modena, S. Agrawal (Eds.) 1 THE PROJECT CLIMON 1.1 Background and project objectives The protection of the cultural heritage is one of the very important tasks of the present genera- tion. Both in India and Europe, there is a great diversity and number of buildings of cultural heritage. One major source of damages on these buildings is the influence of climate: tempera- ture variations, moisture, driving rain, solar radiation. Therefore the preservation of such monuments requires elaborate tools and knowledge about the influencing climatic parameters and the construction’s hygrothermic behaviour. This knowledge is insufficiently available in Europe and India. The CLIMON-project aims at exchanging these needed tools and knowledge, first between the project partners, and second with external experts. The partnership consists of two European universities: TU Dresden, Germany, as main appli- cant and CU Leuven, Belgium. The other partners are: IIT Delhi and MNIT Jaipur as Indian sci- entific partners, and the Indian Council of Architecture, with its reputation and connections im- portant for the spreading of the project results. The Archaeological Survey of India enabled and supported the practical work at the monument. 1.2 Project activities To reach the project goal, three main work packages are used. First, during preliminary studies an equal state of knowledge among the partners is reached to ensure a smooth flow of the fur- ther work. The second section, theoretical modelling and human resources development, pro- vides the scientific tools as a basic requirement: theoretical models on climate parameters, soft- ware and common work standards. In a third work package the practical work at one monument Solar Radiation Measurements and Modelling at the Humayun’s Tomb, New Delhi Claudia Finkenstein, Hans Petzold and Peter Häupl Technical University (TU) Dresden, Institute of Building Climatology, Dresden, Germany Bishwajit Bhattacharjee Indian Institute of Technology (IIT) New Delhi, Department of Civil Engineering, New Delhi, India ABSTRACT: Historical monuments are often damaged by the influence of climate: temperature variations, moisture, driving rain, solar radiation. Therefore, the analysis of the hygrothermic behaviour of a construction plays an important role within the preservation of historical monu- ments. An elaborate interaction of climatic measurement and numerical simulation helps to avoid damages in historical constructions. The article presents the EU-funded project CLIMON which deals with the Indo-European knowledge transfer in building climatology applied on investigations on the Humayun´s Tomb in New Delhi. Furthermore, a revised engineering model for the calculation of solar radiation on arbitrarily oriented and tilted surfaces, taking into account the effects of self-shading, is pre- sented. The well-rounded concept is suitable to be integrated in numerical programs for hy- grothermal building part simulation. At the end of the article, calculation’s results are compared with the measured radiation values.