(19)

(11)

EP 1 230 520 A1

(12)

(43) Date of publication: 14.08.2002 Bulletin 2002/33 (21) Application number: 00980112.7 (22) Date of filing: 08.11.2000

(51) International Patent Classification (IPC)7: F24D 17/00 (86) International application number: PCT/NL0000/813 (87) International publication number: WO 0136/878 (25.05.2001 Gazette 2001/21)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 18.11.1999 NL 1013603 (71) Applicant: Stichting Energieonderzoek Centrum Nederland 1755 ZG Petten (NL)	(72) Inventor: SJOERDSMA, Evert NL-1902 NB Castricum (NL) (74) Representative: Dokter, Hendrik Daniel et al Octrooibureau Dokter,P.O. Box 657 7300 AR Apeldoorn 7300 AR Apeldoorn (NL)