Measurement of convective heat transfer for various checker systems

Abstract

The heat transfer properties of six different checkerworks were studied using a special test equipment. The temperature was deliberately limited to 300 C in order to measure the local temperature distribution of the air for the first time. The flow in the regenerator channels shows a considerable non-symmetrical appearance and local strands. Its enthalpy can not be determined by the measurement of only one temperature. The heat transfer depends not only on the velocity of the flow (forced convection) but also on the temperature differences and resulting density differences of the fluid (free convection). In consequence of the low operating temperature and the necessity to measure the air temperature at many points, sufficiently accurate values for the coefficient of heat transfer could only be achieved for a part of the parameter range of industrial regenerators.