The Heat and Mass Transfer Laboratory, Laboratori de Termotècnia i Energètica, of the Universitat Politècnica de Catalunya·BarcelonaTech (UPC), also constituted as Heat and Mass Transfer Technological Center, Centre Tecnològic de Transferència de Calor (CTTC), Thermal Systems, Solar Energy development and Aerodynamics and CFD&HT, is situated in Terrassa, a town located 25 km away from Barcelona. The Laboratory is composed by 6 professors, 12 doctor researchers, 33 researchers and 4 technicians to support the Research, all these members of the staff working full time. The research activities are focused on two main lines. The first one is dedicated to the mathematical formulation, numerical resolution and experimental validation of fluid dynamics and heat and mass transfer phenomena. Some issues in this line are: natural and forced convection, turbulence modelling, combustion, two-phase flow, solid-liquid phase change, radiation, porous media, numerical algorithms and solvers, high performance computing (parallelisation), etc. The second line involves the application of the acquired know-how from the basic studies mentioned above to the thermal and fluid dynamic optimisation of thermal system and equipment. Within this second line the Laboratory is working on: refrigeration (vapour compression refrigerating systems, hermetically sealed reciprocating compressors, absorption refrigerating systems,...), HVAC (ventilation, diffusion of contaminants in buildings,....), active and passive solar systems (solar collectors using transparent insulation materials, building facades with transparent layers and ventilation,.....), heat exchangers (gas liquid compact heat exchangers for automobile radiators, evaporators and condensers,...), heat storage (by liquids and using phase change materials,...), aerodynamics, wind energy, etc.