Latent heat recovery type water heater
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[0024]A preferred embodiment of the present invention is explained in detail referring to the drawings.
[0025]A latent heat recovery type water heater A shown in FIG. 1 has a burner 3, a primary heat exchanger 1 for recovering sensible heat from the combustion gas generated by the burner 3, a secondary heat exchanger 2 for recovering latent heat from the combustion gas which has passed through the primary heat exchanger 1, and a controller 4. The burner 3 is a gas burner for burning combustion gas.
[0026]The primary heat exchanger 1 and the secondary heat exchanger 2 have heat transfer tubes 10 and 20, respectively. Hot water or cold water, referred to as water hereinafter, flows in the heat transfer tubes 10, 20 and the outer surfaces of the heat transfer tubes 10, 20 are exposed to combustion gas. The heat transfer tubes 10, 20 are designed to have a plurality of fins 10a, 20a on the outer circumferences for improving heat transfer efficiency. Water supplied to a water inlet 50 ente...
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Abstract
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