Production of heat transfer element

(19)

(11)

EP 0 612 858 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	19.04.1995 Bulletin 1995/16

(43)	Date of publication A2:
	31.08.1994 Bulletin 1994/35

(21)	Application number: 94301175.9

(22)	Date of filing: 18.02.1994

(51)	International Patent Classification (IPC)⁵: C23C 4/12, C23C 4/08, F28F 13/18

(84)	Designated Contracting States:
	DE FR GB

(30)

Priority:

23.02.1993 GB 9303655

(71)	Applicant: Star Refrigeration Ltd.
	Glasgow G46 8JW, Scotland (GB)

(72)	Inventor:
	Pearson, Stephen Forbes Bearsden, Glasgow G61 1PZ (GB)

(74)	Representative: Horner, Martin Grenville et al
	Cruikshank & Fairweather 19 Royal Exchange Square Glasgow G1 3AE Scotland Glasgow G1 3AE Scotland (GB)

(56)

References cited: :

(54)	Production of heat transfer element

(57) A heat transfer element (2) for use in boiling a liquid is produced by spraying a substrate, such as a heat exchanger tube, with a plasma of liquified metal particles and concurrently spraying the substrate with liquid carbon dioxide to provide a cooling effect. Preferably the metal particle spray (4) and the carbon dioxide spray (8) are spaced apart, and there is relative movement between the sprays and the substrate, such that a given area of the substrate is precooled by the cold carbon dioxide just prior to liquified metal particles impinging thereon. A shroud (6) may assist in directing the liquid carbon dioxide first onto the substrate, then into the spray of liquified metal particles.

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