Control method and apparatus for energy storage heat exchange electric water heater

A control method for an energy storage heat exchange electric water heater, wherein the energy storage heat exchange electric water heater comprises a water tank, an energy storage electric heater, a heat exchanger, a flow-through electric heater and a thermostatic valve;

• the energy storage electric heater and the heat exchanger are arranged in the water tank, the flow-through electric heater and the thermostatic valve are arranged outside the water tank, and the thermostatic valve is connected to an outlet of the heat exchanger, the flow-through electric heater and a water inlet of the energy storage heat exchange electric water heater;
• and the control method comprises:
• preliminarily heating a liquid in the water tank to a first preset temperature value by using the energy storage electric heater, and maintaining the temperature;
• performing heat exchange on a water in the heat exchanger by using the heated liquid in the water tank to obtain a water of the first preset temperature value;
• acquiring a water flow signal value of the energy storage heat exchange electric water heater;
• judging whether the water flow signal value satisfies a first preset trigger requirement;
• if the water flow signal value satisfies the first preset trigger requirement, outputting the water of the first preset temperature value in the heat exchanger to the thermostatic valve;
• controlling the flow-through electric heater and the thermostatic valve to be in an activated operating state at the same time, and using the thermostatic valve to mix the water of the first preset temperature value with a cold water inputted from the water inlet, to obtain a mixed water;
• and
• heating the mixed water outputted by the thermostatic valve to a second preset temperature value by using the flow-through electric heater, the second preset temperature value is greater than the first preset temperature value;
• before controlling the flow-through electric heater and the thermostatic valve to be in the activated operating state at the same time, the control method further comprises:
• acquiring an outlet water temperature of the thermostatic valve;
• judging whether the outlet water temperature satisfies a second preset trigger requirement;
• and
• if the outlet water temperature satisfies the second preset trigger requirement, controlling the flow-through electric heater and the thermostatic valve to be in the activated operating state at the same time;
• in a step of judging whether the outlet water temperature satisfies the second preset trigger requirement, the control method comprises:
• acquiring a preset temperature rise value of the flow-through electric heater;
• determining a temperature difference value between the second preset temperature value and the preset temperature rise value;
• judging whether the outlet water temperature is greater than or equal to the temperature difference value;
• and
• if the outlet water temperature is greater than or equal to the temperature difference value, determining that the outlet water temperature satisfies the second preset trigger requirement.