Preheating and heat preservation control method of zero-cold-water gas water heater

Abstract

The invention discloses a preheating and heat preservation control method of a zero-cold-water gas water heater. The preheating and heat preservation control method comprises the following steps thatS1, the gas water heater is in a standby mode; S2, the gas water heater is controlled to enter a preheating working mode; S3, the pump-on water return temperature T < pump-on water return > is recorded, and the water outlet temperature T < outlet > is controlled according to the sum of the preset temperature T < preset > and the compensation temperature difference delta T < compensation >; and S4,whether the actually measured return water temperature T < return > is greater than the pump-on water return temperature T < pump-on water return > and the water return temperature rise delta T < water return temperature rise > or not is judged, if so, that the water outlet temperature T < outlet > is controlled according to the preset temperature T < preset > is recovered, and if not, whether the preheating pump-off condition is met or not is judged. By increasing the preheating water temperature, the heat loss of a pipeline is compensated, so that the purposes of shortening the preheating time and improving the use experience of a user are achieved.

Description

technical field [0001] The invention relates to the technical field of water heaters, in particular to a preheating and heat preservation control method for a zero-cold water gas water heater, which is suitable for domestic hot water supply gas water heaters or dual-purpose boilers. Background technique [0002] In related technologies, zero-cold water gas water heaters have become a trend in the gas water heater industry because they can realize instant hot water. When the zero cold water gas water heater starts the preheating function, the built-in circulating water pump runs to drive the external hot water pipe and the water stored in the return pipe to circulate and realize preheating. [0003] However, when the zero-cold water gas water heater is actually used, the water stored in the circulation pipeline has heat loss, the temperature of the return water rises slowly, and the preheating time is long. And the longer the circulation pipeline, the greater the heat loss, ...

AI Technical Summary

Problems solved by technology

[0003] However, when the zero-cold water gas water heater is actually used, the water stored in the circulation pipeline has heat loss, the temperature of the return water rises slowly, and the preheating time is long

And the longer the circulation pipeline, the greater the heat loss, the longer the user waits for hot water, and the user experience is not good

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