Control method and device of electric water heater and electric water heater

Abstract

The invention discloses a control method and device of an electric water heater and an electric water heater. The control method comprises the steps of obtaining the outlet water temperature, inlet water flow and inlet water temperature of the electric water heater at a current sampling time point, judging whether the outlet water temperature is up to the heating temperature set by a user or not, calculating the deviation control amount of the outlet water temperature at the current sampling time point and obtaining corresponding heat power gears according to the deviation control amount of the outlet water temperature, the inlet water flow and the inlet water temperature if the heating temperature set by the user is not reached, obtaining the heating power of the electric water heater at a previous current sampling time point adjacent to the current sampling time point, adjusting the heating power according to the heat power gears and controlling the electric water heater according to the adjusted heating power. By means of the control method, the corresponding heating power is adjusted according to the outlet water temperature, the inlet water flow and the inlet water temperature corresponding to the electric water heater, resource waste caused by heating at fixed heating power is avoided, and energy is saved.

Description

technical field [0001] The invention relates to the technical field of electric water heaters, in particular to a control method and device for the electric water heater and the electric water heater. Background technique [0002] At present, the heating power of electric water heaters commonly used in households is relatively single, and generally there is only one heating power, and the heating power will not change with the increase of water temperature. [0003] The specific process of electric water heater heating is: after the electric water heater obtains the required heating temperature selected or set by the user, the controller in the electric water heater controls the heating device to heat with a fixed heating power, and the temperature sensor samples the water temperature. When the water temperature Stop heating after the temperature is greater than or equal to the user's setting, and then wait for the water temperature in the water tank of the electric water he...

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Problems solved by technology

[0004] In the process of using the electric water heater, the user mixes the hot water in the water heater with the normal temperature water through the water mixing valve, so that the electric water heater outputs water suitable for the bathing temperature of the human body. heating, it is impossible to guarantee the constant temperature of the water outlet of the electric water heater, therefore, the user experience of the user is not ideal

[0005] To sum up, it can be seen that the relevant electric water heaters cannot automatically adjust the heating power according to the temperature of the water, resulting in a waste of power resources, which is not conducive to energy conservation and environmental protection

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