(19)
(11) EP 3 306 221 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.07.2018 Bulletin 2018/28

(43) Date of publication A2:
11.04.2018 Bulletin 2018/15

(21) Application number: 17194192.5

(22) Date of filing: 29.09.2017
(51) International Patent Classification (IPC): 
F24H 4/04(2006.01)
F24H 9/00(2006.01)
 F24D 19/00(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
MA MD

(30) Priority: 05.10.2016 JP 2016197489

(71) Applicant: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.
Tokyo 108-8215 (JP)

(72) Inventors:
  • MAENO, Masashi
    TOKYO, 108-8215 (JP)
  • KOSAKA, Masatomo
    TOKYO, 108-8215 (JP)

(74) Representative: Intès, Didier Gérard André et al
Cabinet Beau de Loménie 158 rue de l'Université
75340 Paris Cedex 07
75340 Paris Cedex 07 (FR)

   


(54) WATER HEATING SYSTEM


(57) The present invention aims to provide a water heating system capable of reducing the frequency of maintenance of a heat exchanger required because of scale.
The present invention provides a heat exchanger (23) including a plurality of heat exchange units (31, 32) which are separated from each other in a predetermined direction and are connected to each other in series. The total cross-sectional area of a water flow channel of the first heat exchange unit (31) cut along a plane orthogonal to a direction in which water flows is smaller than a total cross-sectional area of a water flow channel of the second heat exchange unit (32) cut along a plane orthogonal to the direction in which water flows.







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