Water heater capable of precisely controlling water use point temperature and control method thereof

Abstract

The invention discloses a water heater capable of precisely controlling water use point temperature and a control method thereof. The water heater comprises a water heater body, a water inlet pipe, awater outlet pipe, a gas control valve, a circulating pump, a return water temperature probe, an outlet water temperature probe and a control assembly, wherein the return water temperature probe is arranged on the water inlet pipe and used for real-time monitoring of return water temperature T<return>, the outlet water temperature probe is arranged on the water outlet pipe and used for real-time monitoring of outlet water temperature T<outlet>, and the control assembly is electrically connected with the gas control valve, the circulating pump, the return water temperature probe and the outletwater temperature probe respectively. After a preheating function of the water heater is activated, the control assembly can calculate the water use point temperature T<use> according to the outlet water temperature T<outlet> and the return water temperature T<return> monitored in real time, and can determine whether to finish preheating according to the size relationship of the water use point temperature T<use> and target temperature T<target>. The water heater can achieve precise control over the water use point temperature, the water use point temperature is effectively prevented from being too hot or too cold after the preheating, and the water use experience is improved.

Description

technical field [0001] The invention relates to the technical field of water heaters, in particular to a technology for preheating and temperature control of water heaters. Background technique [0002] Zero-cold water gas water heaters have become a trend in the water heater industry because they can realize instant hot water. When the preheating function is started, the built-in circulation pump runs to drive the water stored in the external hot water pipe and return pipe to circulate and realize preheating. Conventional zero-cooled water gas water heaters generally determine whether preheating is completed by monitoring the return water temperature or the outlet water temperature. [0003] For the control logic of judging whether preheating is completed by monitoring the return water temperature, there will be the following problems: 1. The water temperature at the actual water point may be overheated or too cold. The temperature distribution of the water stored in the ...

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Problems solved by technology

[0003] For the control logic of judging whether preheating is completed by monitoring the return water temperature, there will be the following problems: 1. The water temperature at the actual water point may be overheated or too cold. The temperature distribution of the water stored in the circulation pipeline after heating is uneven, and the water temperature of the water points in different locations is different, which is quite different from the preset temperature, which affects the water experience

[0004] For the control logic of judging whether the preheating is completed by monitoring the outlet water temperature, there will be the following problems: 1. When the preset temperature is low, after the preheating function is turned off, the actual water point is far away from the water heater, especially in winter. 2. When the preset temperature is high, the water heater burns under heavy load but cannot reach the expected temperature, and wastes gas at the same time

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