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Title:
WATER HEATER
Document Type and Number:
Japanese Patent JPH01174856
Kind Code:
A
Abstract:

PURPOSE: To lower the exhaust temperature of an exhaust gas to or below the saturation temperature of the gas and enable effective recovery of the latent heat of evaporation, by partitioning the interior of a water-heating tank into upper and lower water-heating parts, providing a second indirect hot-water heat exchanging part on the downstream side of a first indirect hot-water heat exchanging part in a hot water circulating system provided for the upper water-heating part, and connecting a return pipe between the downstream side of the second heat exchanging part and a lower part of the lower water-heating part.

CONSTITUTION: A combustion exhaust gas generated at a burner 14 is discharged from a combustion chamber 5 through an exhaust pipe 7 and an exhaust chamber 6, while making heat exchange with water contained in a water-heating tank 1 to heat the water in a water- heating part 3 to a higher temperature, as compared with the water in a water-heating part 4. The water heated in the water-heating part 3 is passed through an indirect hot-water heat exchanging part 8, when it is cooled through heat exchange with the water in a hot water supplying system C. The hot water reaching the downstream side of the heat exchanging part 8 while being lowered in temperature is divided into a portion fed toward a lower part of the water-heating part 3 and a portion fed toward an indirect hot-water heat exchanging part 9. The hot water reaching the lower part of the water-heating part 3 is again heated. The hot water fed toward the heat exchanging part 9 is further lowered in temperature through heat exchange with the water on upstream parts of the system C, is then returned from the downstream side of the heat exchanging part 9 to a lower part of the water-heating part 4 through a return pipe 10, and is re-heated.


Inventors:
SUGANO YOSHIHIRO
KOSHIMIZU DAISUKE
YUMOTO NORIO
SAITO HIDETOSHI
Application Number:
JP1987000336362
Publication Date:
July 11, 1989
Filing Date:
December 28, 1987
Export Citation:
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Assignee:
TOKYO GAS CO LTD
HOSOYAMA NEKKI KK
International Classes:
F24H1/18; F24D3/00; F24H1/20; (IPC1-7): F24H1/18; F24H1/20
Attorney, Agent or Firm:
佐藤 幸男 (外1名)



 
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