A kind of anti-condensation gas water heater and control method

Abstract

The invention relates to a gas water heater for preventing condensed water, which comprises a casing, a heat exchanger, a first fan arranged at the air inlet of a combustion chamber, a ventilation pipe, a second fan arranged near the outlet of the air inlet pipeline, and a warm water heater. The humidity sensor is a temperature sensor arranged on the surface of the heat exchanger, and the ventilation pipe includes an isolated air inlet pipeline and a smoke exhaust pipeline, and a spiral baffle is arranged in the air inlet pipeline. The present invention also relates to a control method for preventing condensed water of a gas water heater, which calculates the moisture content of the air entering the housing and calculates the moisture content of combustion products; calculates the moisture content of flue gas according to the moisture content of air and the moisture content of combustion products Moisture content; calculate the dew point temperature of the flue gas according to the moisture content of the flue gas; compare the dew point temperature of the flue gas with the temperature on the surface of the heat exchanger, and then adjust the speed of the second fan and the first fan according to the comparison result, thereby reducing The moisture content of the air entering the enclosure. The gas water heater and control method for preventing condensed water can reduce the dew point temperature of flue gas and prevent the generation of condensed water.

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

Images