Experimental Investigation of Different Finned Tube Heat Exchanger

EasyChair Preprint 4910

Abstract

This study presented the experimental  effect of heat transfer through the cross-flow heat exchanger and the impact of changing the height of the fins on improving the heat transfer of four exchangers with eight-corridor (smooth tube, low, medium and high integral finned tubes) those are cooled by air, each corridor has a length of 250 mm inside the air duct. The working conditions are (1, 1.7, 2.3) m /sec air velocity, water flow rates (2-6) L/ min, water entry temperature (50, 60, 70)^oC. The experimental results show that the heat transfer coefficient for the air side when using the finned tubes is higher than the smooth tube and the best improvement of the high integral finned tubes are (291%, 329.95%, 182.5W/m².^oC and 0.180 ) the enhancement factor, heat transfer rate, overall heat transfer coefficient  and effectiveness respectively.

Empirical correlations were found for the Nusselt's number in the air side of the three exchangers (low, med, high) and a model for these correlations with a water flow rate of (6L/min) and the water temperature of (70°C).

Nua=0.2449 Rea0.4577 Pra1/3 (AoAi)0.7661

(20496.54 < Re_a < 48394.26)

Keyphrases: Cross flow heat exchanger, Fins, Integral fins tube, heat transfer coefficient

@booklet{EasyChair:4910,
  author    = {Farah Abdulzahra Taher and Zena Khalefa Kadhim},
  title     = {Experimental Investigation of Different Finned Tube Heat Exchanger},
  howpublished = {EasyChair Preprint 4910},
  year      = {EasyChair, 2021}}