Method for the thermal qualification of a receiver tube of solar systems

摘要

Method for thermal qualification of a receiver tube of solar systems, which consists of a medium-leading absorber tube with a coating and an optically transparent cladding, characterized by the following process steps: - Measuring the ambient temperature T- changing the temperature of the absorber tube by at least one temperature change- measuring the outside temperature T is the absorber tube at a first temperature measuring point at least two times during the temperature change - measuring the temperature Tan an outer surface of the cladding tube at the first temperature measuring point in the radial direction of the cladding tube opposite second temperature measuring point at the at least two times during the temperature change, wherein the ratio of heat loss Q̇durch Heat radiation at the second temperature measuring point is changed to the convective heat loss Q̇derart that applies: Q̇ Q̇oderwobei the change in the temperature r of the absorber tube is carried out at a temperature level, so that T-T≤ 50 K applies- determining at least one characteristic of the thermal quality of the receiver tube characteristic from the measured.