HEAT EXCHANGER AND WATER HEATING DEVICE INCLUDING THE SAME
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United States of America Patent
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Issued Date -
Aug 26, 2021
app pub date -
Feb 17, 2021
filing date -
Feb 26, 2020
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Abstract
A heat exchanger includes: a casing into which heating gas is supplied; and a plurality of heat transfer tubes which are arranged in the casing, wherein the plurality of heat transfer tubes are set in a posture in which a plurality of straight tube portions are arranged in a direction intersecting a heating gas flow direction, are stacked a plurality of stages in the heating gas flow direction, and are distinguished into first and second heat transfer tubes respectively located on an upstream side and a downstream side in the heating gas flow direction, and wherein the second heat transfer tube is formed so that an outer diameter of the tube and an arrangement pitch of the plurality of straight tube portions are smaller than those of the first heat transfer tube.
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