Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
DESIGN OF SHELL AND TUBE HEAT EXCHANGERS FOR WASTE HEAT RECOVERY WIHT THE KALINA CYCLE
Submission Author:
Felipe Raul Ponce Arrieta , MG
Co-Authors:
Cláudio Silva, Josme Santos
Presenter: Felipe Raul Ponce Arrieta
doi://10.26678/ABCM.ENCIT2016.CIT2016-0440
Abstract
The purpose in the design of shell and tube heat exchangers is to calculate the heat transfer surface area aiming to waste heat recovery with Kalina cycles. The procedure for calculating the area was implemented in software Engineering Equation Solver (EES). We made the area calculation using the Logarithmic Mean Temperature Difference (LMTD) and determining the overall heat transfer coefficient. The calculation of the LMTD was held with the existing functions in EES for the correction factor calculation. The determination of the overall heat transfer coefficient was performed by calculating the convective heat transfer coefficients for the hot and cold sides of the heat exchanger. Additional correlations were implemented in the EES to calculate the thermodynamic properties of NH3-H2O mixture and to determine the transport properties of the phase change regions. As input data for the calculations were employed geometry (internal and external diameters of the tubes, the exchanger arrangement, geometrical arrangement of the pipes, etc.) and the heat balance of the heat exchanger (temperature, concentration of NH3-H2O mixture, etc.) obtained by simulation of the Kalina cycle. As an example of the results that were obtained for the evaporator, the overall heat transfer coefficient was found to be 62 W/m2K and the heat transfer surface area of 122 m2. This value of the overall heat transfer coefficient is within the ranges reported in the literature by other researchers.
Keywords
Heat transfer, convection heat transfer., EES Simulation, Waste heat Recovery
