thermal storage electric water heater

Abstract

This invention discloses a thermal storage electric water heater. The thermal storage electric water heater includes a storage tank, a water temperature sensing module, a display module, and a control circuit. The storage tank has a cold water inlet pipe, a hot water outlet pipe, and an electric heating element. The height of the water temperature sensing module relative to the ground is greater than the height of the electric heating element relative to the ground. The control circuit acquires multiple parameters of the thermal storage electric water heater and determines whether water is being dispensed from the storage tank through the water temperature sensing module. When water is being dispensed from the storage tank, the control circuit calculates the hot water storage capacity based on these parameters and performs a calculation to display a decreasing hot water storage capacity. Next, the control circuit determines whether the water in the storage tank is turned off through the water temperature sensing module and performs a calculation to display an increasing hot water storage capacity when the water in the storage tank is turned off.

Claims

1. A thermal storage electric water heater, comprising: a water storage tank having a cold water inlet pipe, a hot water outlet pipe, and an electric heating element; a water temperature sensing module for sensing the water temperature of the water storage tank, wherein the height of the water temperature sensing module relative to the ground is greater than the height of the electric heating element relative to the ground. A display module and a control circuit are electrically connected to the electric heating element, the water temperature sensing module, and the display module. The control circuit acquires multiple parameters of the storage-type electric water heater and determines whether the water tank is dispensing water based on the sensing results of the water temperature sensing module. When the water tank is dispensing water, the control circuit calculates a hot water storage capacity based on the acquired parameters and performs a calculation to convert the hot water storage capacity into a decreasing display, causing the display module to display the calculation result of the hot water storage capacity decreasing display. Subsequently, the control circuit determines whether the water tank is turned off based on the sensing results of the water temperature sensing module. When the water tank is turned off, the control circuit performs a calculation to convert the hot water storage capacity into an increasing display, causing the display module to display the calculation result of the hot water storage capacity increasing display.

2. The thermal storage electric water heater as described in claim 1, wherein, The water temperature sensing module includes an inlet water temperature sensor installed in the cold water inlet pipe and an inlet water temperature sensor that extends from the outside of the water storage tank into the inside of the water storage tank. The control circuit determines whether the water storage tank is dispensing water based on the temperature slope generated by the sensing result of the inlet water temperature sensor.

3. The thermal storage electric water heater as described in claim 2, wherein, The control circuit further determines whether the water tank is dispensing water by using the heating signal generated by the electric heating element and the temperature slope generated by the sensing result of the inlet water temperature sensor.

4. The thermal storage electric water heater as described in claim 3, wherein, The control circuit further determines whether the water tank should be turned off by using the temperature slope generated by the water temperature sensor inside the tank.

5. The thermal storage electric water heater as described in claim 1, wherein, The parameters obtained by the control circuit include: water volume in the tank, power of the electric heating element, inlet cold water temperature, average inlet cold water temperature, set heating completion temperature in the tank, current water temperature in the tank, predetermined mixing temperature, predetermined water output, water volume adjustment coefficient in the tank, and calorific value adjustment coefficient of the electric heating element. The control circuit calculates the hot water storage based on the set heating completion temperature in the tank, the predetermined mixing temperature, the water volume in the tank, the water volume adjustment coefficient in the tank, the average inlet cold water temperature, the predetermined water output, and the calorific value adjustment coefficient of the electric heating element.

6. The storage-type electric water heater as described in claim 5, wherein, The control circuit performs the calculation for the hot water inventory reduction conversion display, including the following steps: calculating the remaining hot water percentage of a water outlet; calculating the remaining usable hot water time of a water outlet based on the calculated remaining hot water percentage; and converting the calculated remaining usable hot water time into a display format in the form of a number of bars for the display module to display.

7. The thermal storage electric water heater as described in claim 5, wherein, The control circuit performs the calculation for the hot water storage increment conversion display, including the following steps: calculating the remaining available hot water time after turning off the water; calculating the remaining hot water percentage after turning off the water based on the calculated remaining available hot water time; calculating a temperature difference percentage; calculating the final remaining hot water percentage after turning off the water based on the calculated temperature difference percentage and the remaining hot water percentage after turning off the water; and converting the final remaining hot water percentage after turning off the water into a display format in the form of a number of divisions for display by the display module.

8. The thermal storage electric water heater as described in claim 5, wherein, The parameters obtained by the control circuit also include a predetermined heating slope corresponding to the water volume in the tank and the power of the electric heating tube. Furthermore, when the water in the storage tank is turned off, the control circuit performs an initial calculation of the heating waiting time based on the current water temperature in the tank, the set heating completion temperature in the tank, and the predetermined heating slope, and displays the calculation result of the initial heating waiting time on the display module.

9. The thermal storage electric water heater as described in claim 8, wherein, When the difference between the current water temperature in the tank and the set heating completion temperature in the tank is less than a predetermined value, the control circuit performs a mid-term correction on the initially calculated heating waiting time to update the heating waiting time until the current water temperature in the tank is greater than or equal to the set heating completion temperature in the tank.

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