Condensate water prevention gas water heater and control method

Abstract

The invention relates to a condensate water prevention gas water heater. The condensate water prevention gas water heater comprises a shell, a heat exchanger, a first draught fan, a vent pipe, a second draught fan, a temperature and humidity sensor and a temperature sensor, wherein the first draught fan is arranged at an air inlet of a combustion chamber; the second draught fan and the temperatureand humidity sensor are arranged close to an outlet of an air inlet pipe; the temperature sensor is arranged on the surface of the heat exchanger; the vent pipe comprises the air inlet pipe and a smoke exhaust pipe which are isolated; and a spiral blocking plate is arranged in the air inlet pipe. The invention further relates to a control method of preventing condensate water of the gas water heater. The control method comprises the steps of calculating the moisture content of air going into the shell, and calculating the moisture content of combustion products; calculating the moisture content of exhaust gas according to the moisture content of the air and the moisture content of the combustion products; calculating the dew point temperature of the exhaust gas according to the moisture content of the exhaust gas; and comparing the dew point temperature of the exhaust gas with the surface temperature of the heat exchanger, adjusting the rotating speeds of the second draught fan and the first draught fan according to the comparison result and then reducing the moisture content of the air going into the shell. Through the condensate water prevention gas water heater and the controlmethod, the dew point temperature of the exhaust gas can be reduced, and generation of condensate water is prevented.

Description

technical field [0001] The invention relates to the technical field of gas water heaters, in particular to a gas water heater for preventing condensed water, and also relates to a control method for preventing condensed water for the gas water heater. Background technique [0002] When the gas water heater is burning and working under low load, due to the low exhaust gas temperature, it is prone to the phenomenon that the temperature of the flue gas is lower than the dew point temperature, resulting in the precipitation of condensed water on the inner wall of the heat exchanger. On the one hand, the condensed water accumulated on the inner wall of the heat exchanger is easy to drop on the fire row and cause the flame to go out; on the other hand, the condensed water on the inner wall of the heat exchanger combines with CO2, NOx, etc. in the flue gas to form acidic substances, It will cause acid corrosion to the heat exchanger and reduce the service life of the heat exchanger...

AI Technical Summary

Problems solved by technology

However, when the gas water heater is in use, when the hot water is turned on again after the water is cut off, there will be a period of high temperature of the outlet water, which may be scalded to the user

In addition, when the outlet water temperature is constant, it needs to be considered that the temperature of the heat exchanger is higher than the outlet water temperature, and the calculated load is higher than the actual load demand, which will consume more gas and not save energy.

In addition, in the rainy season, the air humidity is high, and there is still the phenomenon of condensed water on the inner wall of the heat exchanger, which cannot fundamentally prevent the generation of condensed water

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