Cooling of spherical products: Part I—effective process parameters

Abstract

An experimental and methodological study was performed for determining the effective cooling process parameters, namely cooling coefficients, lag factors, half cooling times and seven-eighths cooling times of the individual products being cooled with water and with forced air. The different batch weights in water cooling and the different flow velocities in forced air cooling were used to determine the changes in the effective cooling process parameters. In the experimental investigation, the centre temperatures of the individual products were measured. A regression analysis in the exponential form was applied to the measured temperature distributions and therefore, the effective cooling parameters were determined in a simple case. As a result, the half cooling times and seven-eighths cooling times of the individual products increased with an increase in the batch weight in water cooling and decreased with an increase in the air-flow velocity in the air cooling.