A simplified correlation for the air-side heat transfer coefficient exhibited from plate finned heat exchangers was accomplished. The development of the present formula was based on the implementation of the Buckingham-pi theorem. The physical dimensions of the plate fin parameters and tube geometry of the heat exchanger were incorporated in the correlation to reveal their effect on air-side heat transfer coefficient. It is intended to be used for air dry bulb and wet bulb temperatures in the range 16–40 °C and 13–20 °C through the tube banks, respectively. It is valid for transverse to longitudinal tube pitches ratio of XT/XL = 0.75 and 0.83. The air-side Reynolds number based on maximum flow velocity and equivalent tube diameter to be in the range of 2.2 × 103 ≤ Re ≤ 8.75 × 103. The total mean absolute errors of the predicted overall heat transfer coefficient and heat duty were 10% and 13%, respectively.

The present work represents an attempt to formulate the air heat transfer performance exhibited from a wavy corrugated duct in the form of simplified correlations at constant heat flux. The correlations are empirical formulae intended to be applied for a corrugation wavelength to amplitude ratio (λ/a) of (5.7-12.6) with (0°) phase shift angle at corrugation plate angles of (54.5°), (45°), (38°), and (32.5°). The main stream air flow Reynolds number domain through the corrugated duct was bounded by (1.85×10 3) to (3.9×10 3). Four simple correlations for the heat transfer coefficient enhancement factor, corrugated duct heat transfer coefficient, Stanton number and Nusselt number were developed by the implementation of the Buckingham-pi theorem. These correlations were in terms of the duct corrugation characteristics, flow operating conditions and exerted heat flux. The deviation of the predicted data for the heat transfer coefficient enhancement factor was within a scatter of (± 10) %. The corrugated duct Stanton number, Nusselt number and heat transfer coefficient were correlated with accuracy margin of (± 20) % of the measured experimental data.

The paper describes an investigation for the thermal design of a fluidized bed cooler and prediction of heat transfer rate among the media categories. It is devoted to the thermal design of such equipment and their application in the industrial fields. It outlines the strategy for the fluidization heat transfer mode and its implementation in industry. The thermal design for fluidized bed cooler is used to furnish a complete design for a fluidized bed cooler of Sodium Bicarbonate. The total thermal load distribution between the air-solid and water-solid along the cooler is calculated according to the thermal equilibrium. The step by step technique was used to accomplish the thermal design of the fluidized bed cooler. It predicts the load, air, solid and water temperature along the trough. The thermal design for fluidized bed cooler revealed to the installation of a heat exchanger consists of (65) horizontal tubes with (33.4) mm diameter and (4) m length inside the bed trough.