The purpose of this thesis work is to develop models of a particular tri generation system (TCA + PV/T), with solar irradiation as the main source of waste heat. A tri generation system is one which delivers combined heating and power. In so doing the aim of the work will be to show the functionality of these developed models and how it works in three different climates (Madrid, Spain; Benin, Nigeria; Phoenix, USA) The method used in the development of these models is in the EES program (engineering equation solver) which is useful in the calculation of heat and energy equations. Composite models were combined and a final simulation was performed to give outputs of heat and cooling produced for the different climates. The results obtained are mixed, with the Phoenix climate given the best results by delivering the required load capacity to this system and with the Madrid climate being the most unlikely. The main conclusion is that for this tri generation system to be feasible a back up system is required for the constant running of the tri generation system