| 摘要 |
PROBLEM TO BE SOLVED: To increase heat transfer efficiency of a heat absorbing surface with a comparatively simple structure and restrain generation of nitrogen oxides at the time of combustion by providing an exhaust emitter having an airtight structure at a downstream side of a burner and specifying an area of a plurality of emitting ports provided to the emitter, a heating value of the burner and the like. SOLUTION: A premixing forced combustion burner 5 in a gas combustion heater is arranged such that a mixed gas of air and gas produced at a mixer 2 is fed to a blower 3, and that the mixed gas is blown out from a burner port 6 having a number of small holes and grooves and combusted. The exhaust resulting from the combustion is emitted to a heat absorbing surface 13 of an object to be combusted from an emitting port 12... of a jetting member 10 which is provided at a downstream of the burner 5 so as to heat the heat absorbing surface. Specifically, the function of the blower 3, the heating value of the burner 5 and an emitting port area are set so that the flowing velocity of the combusted exhaust from the emitter 12 is 5 m/sec. or more when combusted at a rated maximum heating value. Further, an adequate space volume is set in order to restrain radiant heat from the jetting member 11 to the burner 5.
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