High-efficiency water tank for heat pump water heater

Abstract

The invention relates to a high-efficiency water tank for a heat pump water heater, which comprises a shell, an insulating layer and an inner chamber, wherein a plurality of layers of water flow units are arranged in the inner chamber from top to bottom in an overlapped way; the water flow unit comprises a surrounding edge and a elongated groove-shaped water flow channel inside the surrounding edge; the tail end of the water flow channel of each layer of water flow unit is provided with an open hole communicated with the head end of the lower layer of water flow unit; the head end of the water flow channel of the water flow unit at the top is provided with an upper opening connected with external equipment; and the tail end of the water flow channel of the water flow unit at the bottom is provided with a lower opening connected with the external equipment. The external equipment comprises a heat exchanger and a circulating water pump of the heat pump water heater. The invention has reasonable structure design, reduces the mixture of cold water and hot water in the water tank when the water flow circulates, improves the operating condition of a heat pump system, increases the energy efficiency of products, and shortens the heating time.

Description

technical field [0001] The invention relates to a water tank, in particular to a high-efficiency water tank for heat pump water heaters. Background technique [0002] For some families or commercial places with large water demand, the direct hot water supply system of heat pump water heaters often cannot meet the requirements, so a water tank is required to store hot water. The existing water tank structure mainly includes an outer shell, an insulation layer and an inner tank. There is a water outlet at the bottom and a water inlet at the top. The heat exchanger of the heat pump water heater and the circulating water pump are connected to the outside in turn. The water is directly stored in the large-capacity inner tank. This kind of water tank has the following disadvantages when used with the heat pump system Disadvantage: low energy efficiency. When the water in the water tank needs to be heated, the circulation pump is used to draw water from the bottom of the water tank...

AI Technical Summary

Problems solved by technology

[0002] For some families or commercial places with large water demand, the direct hot water supply system of heat pump water heaters often cannot meet the requirements, so a water tank is required to store hot water. The existing water tank structure mainly includes an outer shell, an insulation layer and an inner tank. There is a water outlet at the bottom and a water inlet at the top. The heat exchanger of the heat pump water heater and the circulating water pump are connected to the outside in turn. The water is directly stored in the large-capacity inner tank. This kind of water tank has the following disadvantages when used with the heat pump system Disadvantage: low energy efficiency. When the water in the water tank needs to be heated, the circulation pump is used to draw water from the bottom of the water tank, and then flow back to the water tank from the top after passing through the heat exchanger, and mix with a large amount of cold water in the water tank. The temperature rise rate of the inner water is extremely slow; on the other hand, due to the use of the heat pump system, when the temperature of the water in the water tank is slowly raised to close to the set water temperature, the temperature of the water entering the heat exchanger is already high at this time, and the compressor of the heat pump system The return air temperature also becomes relatively high, resulting in frequent shutdowns of the heat pump system, and its energy efficiency is also greatly reduced. The main reason is that the compressor suction temperature should not only not be too low, but also not An appropriate temperature range, the energy efficiency ratio (cop value) of the heat pump system is more reasonable, the traditional water storage tank has a large volume and a small temperature gradient, so it has a greater adverse effect on the heat pump system

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