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We have designed an apparatus dedicated for measurement of heat transfer coeffcient during saturated nucleate pool boiling. After several performed measurements, we have applied three important modifications of the apparatus motivated by discrepancies between measured and correlated heat transfer coeffcients. Firstly, the cubic stainless-steel heated block of the apparatus no longer accommodates heating cartridges. It now stands on a copper carrier of the cartridges, which are vertically oriented. Secondly, we have insulated the heated block with plates made of cellular glass. Thirdly, thermocouples used for measurement of temperatures inside the block have been fixated with a special high-temperature adhesive. These modifications were applied in order to improve the temperature distribution inside the block and to eliminate the impact of surroundings on measured heat transfer coeffcients. This contribution presents and discusses experimental results obtained with these modifications.

We have designed a simple apparatus for measurement of heat transfer during pool boiling in order to find or create suitable correlations for heat-transfer coefficient, which could be used for various liquids and conditions. We have run several testing experiments with tap and deionized water. This contribution presents proceedings and the first results of these experiments as well as comparison of these results with some published and verified correlations.