Heat transfer analysis and numerical simulation of a parabolic trough solar collector A.A. Hachicha, I. Rodríguez, R. Capdevila, A. Oliva ∗ a Centre Tecnològic de Transferència de Calor, Universitat Politècnica de Catalunya,ETSEIAT, Colom 11, 08222 Terrassa (Barcelona), Spain. Abstract Parabolic trough solar collector is the most proven industry-scale solar gen- eration technology today available. The thermal performance of such devices is of major interest for optimising the solar field output and increase the ef- ficiency of power plants. In this paper, a detailed numerical heat transfer model based on the finite volume method for these equipment is presented. In the model, the different elements of the receiver are discretised into sev- eral segments in both axial and azimuthal directions and energy balances are applied for each control volume. An optical model is also developed for calculating the non-uniform solar flux distribution around the receiver. This model is based on finite volume method and ray trace techniques and takes into account the finite size of the Sun. The solar heat flux is determined as a pre-processing task and coupled to the energy balance model as a boundary condition for the outer surface of the receiver. The set of algebraic equations are solved simultaneously using direct solvers. The model is thoroughly val- * Tel: +34 93 739 8192; fax: +34 93 739 8101 Email address: cttc@cttc.upc.edu (A. Oliva) URL: http://wwww.cttc.upc.edu (A. Oliva) Preprint submitted to Applied Energy August 2, 2012