Showing papers by "Rosenberg J. Romero published in 2009"

Instantaneous Determination of Heat Transfer Coefficients in a Steam Generator for an Alternative Energy Upgrade System

Abstract: The present work shows a mathematical model to determine the thermal behavior of a steam generator in an al- ternative energy upgrade system. In this system, alternative energy (solar, geothermal or waste heat from an industrial process) is upgraded to a higher temperature, through a thermodynamic cycle. A plate heat exchanger is used as the steam generator, and is a key component in the system. A mixture of water-lithium bromide + ethylene glycol was used as working solution. The steam generator works with alternative energy, this is used to evaporate a part of the working solu- tion inside the steam generator. The temperature profile and the heat transfer coefficients were obtained with type T ther- mocouples placed along the plate heat exchanger. The conditions that produce the highest heat transfer coefficients for the alternative energy system and the calculated heat transfer coefficients for the working solution are shown. This is the first work where a plate heat exchanger is used as a steam generator in an energy upgrade system and the first time that has been calculated the heat transfer coefficients for the working solution. There are no previous data of the use of the work- ing solution on steam generators.