Start-up and stop control method of heat pump water heater

Abstract

The invention discloses a heat pump water heater starting control method. The method includes the following steps: respectively receiving first temperature T1 of the middle of a water tank, second temperature T2 of the bottom of the water tank, third temperature Te detected by an environmental temperature sensor and user set temperature Ts; judging whether a water heater is in a standby state or not; if yes, judging whether T1, T2, Te and Ts meet any of four conditions or not; if yes, starting the water heater to make hot water, and if not, maintaining the current standby state. In addition, the invention further discloses a heat pump water heater stopping control method. A scheme of double-sensing thermal bulb is adopted, combined control of starting and stopping of the water heater is realized by combining environmental temperature and set temperature, and the water heater is enabled to be started and stopped optimally in various circumstances.

Description

technical field [0001] The invention relates to a water heater, in particular to a control method for starting and stopping a heat pump water heater. Background technique [0002] Existing heat pump water heaters are mainly composed of heat pump components, a water pump and a water storage tank. The water pump pumps a small part of water to the heat exchanger to heat up, and then returns to the water storage tank. In this way, all the water in the water storage tank is heated. At present, heat pump water heaters generally adopt a single temperature sensor control scheme, that is, a temperature sensor package is used to detect the temperature of the water in the water tank. When the temperature reaches the set temperature, it will stop, and when the temperature is lower than the set temperature, it will start up. This control scheme exists. The following defects: [0003] 1. A single temperature sensor cannot fully reflect the temperature distribution of the water tank; [...

AI Technical Summary

Problems solved by technology

[0003] 1. A single temperature sensing package cannot fully reflect the temperature distribution of the water tank;

[0004] 2. The position of the single-sensing temperature bulb affects the start-up of the unit. If the position is too low, it will start up early and stop too late, and if the position is too high, it will start too late and stop too early;

[0005] 3. The water consumption cannot be quickly detected, resulting in cold water under the temperature sensing package when starting up, and starting up too late;

[0006] 4. Does not consider the influence of ambient temperature

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