MEASUREMENT OF CONVECTIVE HEAT-TRANSFER FOR VARIOUS CHECKER SYSTEMS

The heat transfer properties of six different checkerworks were studie d using a special test equipment. The temperature was deliberately lim ited to 300-degrees-C in order to measure the local temperature distri bution of the air for the first time. The flow in the regenerator chan nels shows a considerable non-symmetrical appearance and local strands . Its enthalpy can not be determined by the measurement of only one te mperature. The heat transfer depends not only on the velocity of the f low (forced convection) but also on the temperature differences and re sulting density differences of the fluid (free convection). In consequ ence 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.