Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Evaluation of the thermal-hydraulic performance of heat exchanger for energy reuse in organic Rankine cycles
Submission Author:
Cristiano Tibiriçá , SP
Co-Authors:
Caio Morini, Thalles Coimbra Borba Roldão , Alex Roger Almeida Colmanetti, Cristiano Tibiriçá
Presenter: Cristiano Tibiriçá
doi://10.26678/ABCM.ENCIT2022.CIT22-0143
Abstract
This project focuses in the thermal-hydraulic evaluation of two-types of compact heat exchangers used for energy reuse in Organic Rankine Cycles. For this, it is used a multi-pass cross-flow plain fin-and-tube heat exchanger with a 1.31m2 total surface area and 2 rows of circular tubes, and a single pass cross-flow heat exchanger with multi-louvered fin array, a 0.96 m2 total surface area and 16 rectangular micro-channels. In the experiments, the heat exchangers operate with a single-phase water internal flow, and external air flow with inlet velocities between 1 and 2 m/s and inlet temperatures between 15 and 60°C. For the plain fin-and-tube exchanger, the external convection coefficients obtained experimentally are between 44.5 and 61.6 W/m2K, and for the cross-flow exchanger with multi-louvered fin at the same operating conditions, between 143.1 and 193.3 W/m2K. The obtained results are compared with thermal-hydraulic correlations. The totality of experimental Colburn j-factor data were correlated within } 15% for both plain fin-and-tube and multi-louvered with micro-channels heat exchangers, with mean deviation of 6.7% and 10.1%, respectively.
Keywords
Heat exchanger, tube and fin, louvered heat exchanger, microchannels, experimental
