Heat pump water heater and its control method

Abstract

The invention relates to the technical field of water heaters, in particular to a heat pump water heater and a control method thereof. The heat pump water heater includes a water tank, an upper heat exchanger and a lower heat exchanger coiled around the inner tank of the water tank, respectively, and a throttling valve that is connected in series with the upper and lower heat exchangers and connected in turn through pipelines to form a circulation flow channel. valve, wind-side heat exchanger, four-way valve, and compressor, the upper part of the water tank liner is provided with a water outlet, and the lower part is provided with a water inlet, and the upper and lower heat exchangers are located between the water inlet and outlet. The invention provides a heat pump water heater with double heat exchange that can be independently controlled, and at the same time provides a separate upper heat exchanger, separate lower heat exchanger, or upper and lower heat exchange according to the water temperature at different positions in the inner tank of the water tank. A control method for improving the heat exchange efficiency of the heat pump water heater by connecting them in series to the refrigerant circulation channel.

Description

technical field [0001] The invention relates to the technical field of water heaters, in particular to a heat pump water heater and a control method thereof. Background technique [0002] At present, the water tank of heat pump water heater is commonly equipped with micro-channel heat exchanger or copper tube heat exchanger, and both have a unified water inlet and outlet. When the exhaust port of the compressor discharges high temperature and high pressure gas, the whole process will be After running, this method will cause the pressure drop of the high-temperature and high-pressure refrigerant in the heat exchanger to be too large, and the energy consumption of the system will increase. The upper water temperature difference is small, the heat exchange is insufficient, and the utilization rate of the heat exchanger is low, which reduces the heat exchange efficiency and increases the heat exchange cost. SUMMARY OF THE INVENTION [0003] One of the objectives of the presen...

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Problems solved by technology

[0002] At present, heat pump water heater water tanks are commonly equipped with micro-channel heat exchangers or copper tube heat exchangers, and they all have a unified water inlet and outlet. When the exhaust port of the compressor discharges high-temperature and high-pressure gas, it will flow through the entire heat exchanger. After walking, this method will cause a large pressure drop of the high-temperature and high-pressure refrigerant in the heat exchanger, and the energy consumption of the system will increase; at the same time, due to the heating process of the statically heated water tank, the hot water in the relatively lower part will float up, causing the heat exchanger to The upper water temperature difference is small, the heat exchange is insufficient, and the utilization rate of the heat exchanger is low, which reduces the heat exchange efficiency and increases the heat exchange cost

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