Abstract: The invention concerns a method for measuring the cleaning effectiveness of cleaning bodies (20) on heat exchangers having a bunch of tubes (16). Further, a method and a plant is proposed with which the heat transfer from steam into cooling water through the walls of the condenser tubes is measured. The measurement is carried out with the aid of an inertialess temperature sensor (15) so that, by highly sensitive measuring of the temperature sequence of a certain control volume, the cleaning effect of the cleaning bodies can be derived.

Abstract: The invention relates to a method and to an apparatus for monitoring the heat transfer and therefore the efficiency of a condenser. A water column is formed by shutting off a condenser pipe which assumes the steam temperature T.sub.s and whose outflow time after the resumption of the flow can be utilized for measuring the flow velocity. With the knowledge of the water inlet temperature T.sub.1 and the water outlet temperature T.sub.2 measured on the same condenser pipe, it is possible to very accurately establish the heat transfer through the measured condenser pipe, so that on the basis thereof it is e.g. possible to operate a cleaning system with foam rubber balls. Thus, each fraction of the possible efficiency of the condenser is exploited.

Abstract: The invention concerns a method for measuring the cleaning effectiveness of cleaning bodies (20) on heat exchangers having a bunch of tubes (16). Further, a plant is proposed in which the heat transfer from steam into cooling water through the walls of the condenser tubes is measured. The measurement is carried out with the aid of an inertialess temperature sensor (15) so that, by highly sensitive measuring of the temperature sequence of a certain control volume, the cleaning effect of the cleaning bodies can be derived.