Novel heat-pump water heater

Abstract

The invention discloses a novel heat-pump water heater. The novel heat-pump water heater comprises a first heat exchange device and a second heat exchange device. The first heat exchange device and the second heat exchange device carryout heat exchange through a middle heat exchange device. The first heat exchange device comprises a carbon dioxide refrigerant heat pump unit, and the carbon dioxiderefrigerant heat pump unit is provided with an inner coil pipe extending into the middle heat exchange device, and a refrigerant in the middle heat exchange device is heated by the inner coil pipe. The heated refrigerant in the middle heat exchange device heats tap water in the second heat exchange device, and the refrigerant in the middle heat exchange device is only cyclically used in the middle heat exchange device. According to the scheme, by arranging the middle heat exchange device, the refrigerant in the middle heat exchange device is only cyclically used in the middle heat exchange device, so that the refrigerant is not in contact with external matter, and the situation that due to the fact that the refrigerant is contaminated, the inner coil pipe in contact with the refrigerant is rusted is avoided.

Description

technical field [0001] The invention relates to the technical field of heat exchange, in particular to a novel heat pump water heater. Background technique [0002] A heat pump is a high-efficiency and energy-saving device that makes full use of low-grade heat energy. Heat can be transferred spontaneously from a high-temperature object to a low-temperature object, but not in the opposite direction. The working principle of the heat pump is a mechanical device that forces heat to flow from a low-temperature object to a high-temperature object in a reverse cycle. It only consumes a small amount of reverse cycle net work to obtain a large heat supply, which can effectively convert difficult-to-apply low-grade Heat energy is utilized to achieve energy saving purposes. [0003] Generally, heat pump water heaters are heated by coils in non-pressurized water tanks, and there are the following problems: [0004] 1) Since the water tank is a non-pressurized water tank, the stratif...

AI Technical Summary

Problems solved by technology

[0004] 1) Since the water tank is a non-pressurized water tank, the stratification in the water tank is not obvious, and the phenomenon of water mixing is serious. When the water in the water tank is not fully heated to the temperature required by the user, the temperature of the water outlet of the water tank cannot meet the user's demand, which affects the user experience. ;

[0005] 2) The inner coil heats hot water, and the inner coil of the water tank is directly contacted with the tap water continuously entering the water tank for heating. Long-term use will cause serious scaling on the outer wall of the inner coil and affect the heat transfer efficiency of the inner coil;

[0006] In order to solve the above problems, some manufacturers use the outer coil of the pressurized water tank for heating, which solves the problems of serious water mixing in the water tank and scaling of the inner coil, but the new heat transfer method still has low heat transfer efficiency and low heat transfer Poor problem, and the cost of the pressurized water tank is high, which will undoubtedly increase the total cost of the heat pump unit

Images