Water tank, heat pump water heater and control method

Abstract

The invention relates to a water tank and a heat pump water heater. An electric auxiliary heating device is arranged in the water tank, a separation part is arranged in the water tank and forms a separated space inside the water tank, and the separated space is communicated with a water outlet of the water tank; the separation part is provided with a water inlet, the separated space is communicated with the inside of the water tank through the water inlet, and the electric auxiliary heating device is arranged in the separation part and used for heating water in the separated space. The water tank and the heat pump water heater can improve heating energy efficiency of the water tank and reduce heat loss. The invention further relates to a control method of the heat pump water heater comprising the water tank, energy consumption of a heat pump is reduced while the hot water outlet rate is guaranteed, and energy waste is reduced.

Description

technical field [0001] The invention relates to the field of electrical appliances, in particular to a water tank, a heat pump water heater and a control method. Background technique [0002] The principle of the heat pump water heater is that the compressor compresses the returning low-pressure refrigerant and turns it into high-temperature and high-pressure gas to be discharged. The water is heated. Usually, in order to achieve better heating, an electric auxiliary heating device is also provided. [0003] In the existing heat pump water heater, the strip-shaped electric auxiliary heating device is placed at the lower part of the water tank. When starting up and running, the outer coil of the heat pump first heats the water in the water tank. When the temperature of the water in the water tank reaches the target temperature set by the user, the whole machine stops heating the hot water. During this process, when the temperature sensor of the water tank detects When the ...

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Problems solved by technology

[0006] 2. Since the target temperature of the water tank set by the user may be high, and the existing heating method needs to heat the water temperature under the water tank to the target temperature for heat preservation, and in the heating stage of higher water temperature, the heating efficiency of the heat pump will decrease. At this time, it is necessary to turn on the heat pump and the constant power electric auxiliary heating device at the same time to ensure the water output rate of hot water, thereby increasing energy consumption;

[0007] 3. During the high water temperature insulation process of the water tank, due to the large temperature difference between the water temperature in the water tank and the environment, the water tank dissipates heat quickly, and repeated heating is required to ensure that the water temperature is constant at the user's set temperature, which further causes waste of energy;

[0008] 4. At present, the electric auxiliary heating device with fixed power is mainly used for heating in the water tank, lacking precise temperature control

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