Condensation heat-transfer device
AssigneeALSTOM Technology Ltd
InventorsFrancisco Blangetti, Harald Reiss
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Abstract
The heat transfer surfaces of a condensation heat exchanger are provided with a coating according to the invention which comprises a sequence of layers which includes at least one hard layer which comprises amorphous carbon or a plasma polymer and at least one soft layer which comprises amorphous carbon or a plasma polymer. The hard and soft layers are applied alternately, the first layer on the heat transfer surface being a hard layer and the last layer of the coating being a soft layer. The last, soft layer is distinguished in particular by hydrophobic properties. The layer sequence ensures condensation of drops and, at the same time, protects against drop impingement erosion.
Claims8
A condensation heat exchanger comprising:
- heat transfer surfaces for condensation of nonmetallic vapors, the heat transfer surfaces having a coating which contains amorphous carbon, and the surface of the coating having hydrophobic properties;
- wherein the coating, in order to attenuate compression waves which originate from the surface of the coating as a result of the impingement of drops, comprises two or more layer pairs, each layer pair including a hard layer comprising amorphous carbon or a plasma polymer and a soft layer comprising amorphous carbon or a plasma polymer, and the hard and soft layers being applied alternately and the last layer being a soft layer.
Dependencies are inferred from the claim text.