STRUCTURE OF HEAT EXCHANGER OF GAS BOILER, ESPECIALLY IN CONCERNED WITH ENLARGING HEAT TRANSFER AREAS OF HEAT EXCHANGE PIPES AND HEAT TRANSFER FINS AND MAXIMIZING FLOW OF EXHAUST GAS THROUGH EXHAUST RESISTANCE ELEMENTS

摘要

PURPOSE: A structure of a heat exchanger of a gas boiler is provided to enlarge heat transfer areas of heat exchange pipes and heat transfer fins, maximize flow of exhaust gas through exhaust resistance elements, and improve corrosion resistance, thereby improving the heat exchange efficiency. CONSTITUTION: A plurality of heat exchange pipes(40a) having heat transfer fins(40b) on an outer peripheral surface are arranged in a combustion chamber(10) to circulate heating water. The heat exchange pipes have an elliptical section. The heat transfer fins are formed on the outer peripheral surface of the heat exchange pipes at regular gaps through form rolling. Exhaust resistance elements(90) are arranged on the heat transfer fins.