COOLING PERFORMANCE OF HELIUM-GAS WATER-COOLERS IN HENDEL

The helium engineering demonstration loop (HENDEL) has four helium-gas /water coolers where the cooling water flows in the tubes and helium g as on the shell side. Their cooling performance was studied using the operational data from 1982 to 1991. The heat transfer of helium gas on the shell was obtained for segmental and step-up baffle type coolers. Also, the change with operation time was investigated. The cooling pe rformance was lowered by the graphite powder released from the graphit e components for several thousand hours and thereafter recovered becau se the graphite powder from the components was reduced and the powder in the cooler shell was blown off during the operation.