Investigação experimental do desempenho de um trocador de calor de tubos concêntricos

Abstract

In this Work Course Conclusion an experimental investigation of concentric tubes heat exchanger performance under different operating conditions in parallel flow and counterflow was performed. The overall rate of heat transfer was determined using three different methods to compare: Energy Balance, LMDT (Log Mean Temperature Difference) Method, and -NTU (Effectiveness-NTU) Method. All experiments were performed on an experimental apparatus located in Educational Laboratory of Thermal Sciences of Academic Department of Mechanics, Federal University of Technology – Paraná/Ponta Grossa. The experimental uncertainties were calculated by simple sampling technique with the help of Uncertainty Calculator software. Regardless of the method used, the experimental results of the performance of the concentric tube heat exchanger indicated that the highest heat transfer rates occur at higher flow rates of the hot and cold fluids and the higher inlet temperature gradient between the hot fluid and cold. For the same input temperature and flow of hot and cold fluids to flow in counterflow configuration performed better than the configuration in parallel flow.