Carbon dioxide heat pump water heater with balanced heating water tank

Abstract

The utility model discloses a carbon dioxide heat pump water heater with a balanced heating water tank, and belongs to the technical field of carbon dioxide heat pump structures. According to the carbon dioxide heat pump water heater with the balanced heating water tank, the heat storage water tank is heated through the heat exchanger, the inlet of the refrigerant air inlet pipe of the heat exchanger is located in the lower portion of the heat storage water tank, and the outlet of the refrigerant air outlet pipe of the heat exchanger is located in the upper portion of the heat storage water tank, so that the lower heat supply amount of the heat storage water tank is larger than the upper heat supply amount; the heat supply temperature of the lower refrigerant is higher than that of the upper refrigerant, the lower water temperature in the water tank is high, the water density is small, convection heat exchange of water in the water tank is facilitated, and the heat exchange effect is enhanced. The problems that the water temperature above an existing water heater is high, the water outlet temperature at the bottom is low, and the heat exchange efficiency of a system is low are solved.

Description

Technical Field

[0001] This utility model belongs to the technical field of carbon dioxide heat pump structure, specifically relating to a carbon dioxide heat pump water heater with a balanced heating water tank. Background Technology

[0002] Because existing heat exchangers generally use a top-in, bottom-out refrigerant configuration, the water tank being heated typically has its inlet at the top and its outlet at the bottom. High-temperature, high-pressure carbon dioxide refrigerant flows into the heat exchanger, exchanges heat with the liquid in the tank, and then flows out as low-temperature, high-pressure carbon dioxide refrigerant. In other words, the amount of heat that can be exchanged in the heat exchanger gradually decreases from top to bottom. Above 4°C, the density of the water in the tank gradually decreases as the temperature rises; that is, high-temperature water tends to rise, and low-temperature water tends to fall. High-temperature water is mostly located in the upper part of the tank, and low-temperature water is mostly located in the lower part. Since the amount of heat available for exchange in the upper part of the heat exchanger is greater than that in the lower part, the heating supply at the high-temperature water level is greater than that at the low-temperature water level. However, the heat energy demanded at the high-temperature water level is less than that demanded at the low-temperature water level. This mismatch between heat demand and supply leads to uneven heating of the water tank by the water heater. Although this unevenness gradually disappears over time, the increased heating time also leads to a decrease in heating efficiency.

[0003] In summary, existing heaters cannot simultaneously meet the requirements of balanced heating and efficient heating. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a carbon dioxide heat pump water heater with a balanced heating tank, which addresses the shortcomings of the prior art. It has a novel and reasonable design, high heating efficiency, and balanced heating, and is easy to promote and use.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A carbon dioxide heat pump water heater with a balanced heating water tank includes a hot water storage tank; the top of the hot water storage tank is provided with a water tank inlet and the bottom of the hot water storage tank is provided with a water tank outlet; a heat exchanger is wound around the hot water storage tank to realize heat exchange; the refrigerant inlet of the heat exchanger is located at the bottom of the hot water storage tank, and the refrigerant outlet of the heat exchanger is located at the top of the hot water storage tank.

[0007] Furthermore, the heat exchanger adopts a plate heat exchanger; the plate heat exchanger includes a first manifold, a second manifold, multiple flat tubes, a refrigerant inlet pipe and a refrigerant outlet pipe, one end of the flat tube is connected to the first manifold and the other end is connected to the second manifold, and the multiple flat tubes are arranged in parallel on a vertical plane.

[0008] The second manifold includes a non-connected pipe A and a pipe B located below pipe A. Pipe A is used to connect to the refrigerant outlet pipe, and pipe B is used to connect to the refrigerant inlet pipe.

[0009] Furthermore, it also includes a baffle for installation in the second manifold, with the pipe above the baffle being pipe A and the pipe below the baffle being pipe B.

[0010] Furthermore, pipe A and pipe B are two structurally independent pipes.

[0011] Furthermore, the number of flat pipes connected to pipe A is less than the number of flat pipes connected to pipe B.

[0012] Furthermore, it also includes a temperature sensor installed on the heat exchanger to detect the temperature of the heat exchanger, and the data output terminal of the temperature sensor is indeed used to connect to the defrosting system.

[0013] Furthermore, the temperature sensor is installed on the first manifold, specifically on the pipe section between the flat pipe used to connect pipe A and the flat pipe used to connect pipe B.

[0014] Furthermore, the inlet of the refrigerant inlet pipe of the heat exchanger is located below 1 / 2 of the height of the hot water storage tank, and the outlet of the refrigerant outlet pipe of the heat exchanger is located between 1 / 2 and 4 / 5 of the height of the hot water storage tank.

[0015] This utility model has the following advantages compared with the prior art:

[0016] This utility model discloses a carbon dioxide heat pump water heater with a balanced heating tank. It heats the storage tank via a heat exchanger. By placing the refrigerant inlet of the heat exchanger at the bottom of the storage tank and the refrigerant outlet at the top, the heat supply from the bottom of the tank is greater than that from the top. This balances the heat demand of the high-temperature water at the top of the tank compared to the low-temperature water at the bottom, achieving a balanced heating of the storage tank. This also solves the problem of low heating efficiency due to long heating times and addresses the inability of existing heaters to simultaneously meet the requirements of balanced and efficient heating. Furthermore, the heat exchanger uses a plate heat exchanger, which has a high heat transfer coefficient, reducing energy waste and improving heat exchange efficiency. The parallel arrangement of multiple flat tubes on a vertical plane ensures uniform heat exchange.

[0017] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the hot water storage tank structure of Embodiment 1 of the carbon dioxide heat pump water heater with balanced heating water tank of this utility model.

[0019] Figure 2 This is a schematic diagram of the heat exchanger structure of Embodiment 1 of the carbon dioxide heat pump water heater with balanced heating water tank of this utility model.

[0020] Figure 3 This is a schematic diagram of the heat exchanger structure of a carbon dioxide heat pump water heater with a balanced heating water tank according to the present invention, in embodiment 2.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Hot water storage tank; 2. Water tank inlet; 3. Water tank outlet; 4. Refrigerant inlet pipe; 5. Refrigerant inlet pipe inlet; 6. Refrigerant outlet pipe; 7. Refrigerant outlet pipe outlet; 8. First manifold; 9. Second manifold; 10. Flat pipe; 11. Pipe A; 12. Pipe B; 13. Partition plate; 14. Temperature sensor. Detailed Implementation

[0023] Example 1 of a carbon dioxide heat pump water heater with a balanced heating tank:

[0024] like Figure 1 and Figure 2 As shown, the carbon dioxide heat pump water heater with balanced heating water tank includes a hot water storage tank 1. The hot water storage tank 1 has a water inlet 2 at the top and a water outlet 3 at the bottom. Low-temperature water flows in from the water inlet 2 at the top, sinks to the bottom of the hot water storage tank 1, and after heat exchange, high-temperature water flows out from the water outlet 3 at the bottom.

[0025] A heat exchanger is wound around the hot water storage tank 1 to achieve heat exchange. To achieve a balance between heat supply and demand, the refrigerant inlet 5 of the heat exchanger is located at the lower part of the hot water storage tank 1, and the refrigerant outlet 7 of the heat exchanger is located at the upper part of the hot water storage tank 1. Specifically, to further ensure even heating, the inlet of the refrigerant inlet 4 of the heat exchanger is located below 1 / 2 of the height of the hot water storage tank 1, and the refrigerant outlet 7 of the heat exchanger is located between 1 / 2 and 4 / 5 of the height of the hot water storage tank 1.

[0026] The heat exchanger is a plate heat exchanger. The plate heat exchanger includes a first manifold 8, a second manifold 9, multiple flat tubes 10, a refrigerant inlet pipe 4, and a refrigerant outlet pipe 6. One end of each flat tube 10 is connected to the first manifold 8, and the other end is connected to the second manifold 9. The multiple flat tubes 10 are arranged parallel to each other in a vertical plane, offering advantages such as small footprint and high heat exchange efficiency. To achieve orderly refrigerant flow, the second manifold 9 includes a non-connected A pipe 11 and a B pipe 12 located below the A pipe 11. The A pipe 11 connects to the refrigerant outlet pipe 6, and the B pipe 12 connects to the refrigerant inlet pipe 4.

[0027] To improve the compactness of the heat exchanger structure, a baffle 13 is included for installation in the second manifold 9. The pipe above the baffle 13 is pipe A 11, and the pipe below the baffle 13 is pipe B 12. The baffle 13 isolates pipe A 11 and pipe B 12, reducing the size and footprint of the equipment. The baffle 13 design ensures more uniform fluid distribution within the heat exchanger, thereby improving heat exchange efficiency. Using the same manifold and separating pipe A 11 and pipe B 12 only by the baffle 13 simplifies the design and manufacturing process of the heat exchanger, reducing production costs.

[0028] Because the density of high-temperature carbon dioxide is lower than that of low-temperature carbon dioxide, the space occupied by high-temperature carbon dioxide is greater than that occupied by low-temperature carbon dioxide. The flat tube 10 connected to pipe B 12 is used to transport high-temperature, high-pressure carbon dioxide refrigerant, while the flat tube 10 connected to pipe A 11 is used to transport low-temperature, high-pressure carbon dioxide. To improve pipe utilization, the number of flat tubes 10 connected to pipe A 11 is less than the number of flat tubes 10 connected to pipe B 12. For example, the number of flat tubes 10 connected to pipe A 11 is 4, and the number of flat tubes 10 connected to pipe B 12 is 5, or the number of flat tubes 10 connected to pipe A 11 is 2, and the number of flat tubes 10 connected to pipe B 12 is 5. The number of flat tubes 10 can be appropriately varied according to actual operational needs.

[0029] In winter, the surface temperature of the evaporator can drop below zero degrees Celsius, and frost may form on its surface. A thick layer of frost can obstruct airflow, affecting the air conditioner's heating capacity. Existing temperature sensors 14 are typically located on the evaporator, and existing defrosting systems activate based on the temperature data sensed by the sensor 14. However, in this embodiment, since the evaporator releases cold air, this cold air can affect the temperature sensed by the sensor 14, preventing the defrosting system from activating accurately. Therefore, a temperature sensor 14 is also included, located on the heat exchanger, to detect the heat exchanger's temperature. The data output of the temperature sensor 14 is indeed connected to the defrosting system. If frost buildup on the evaporator affects the release of cold energy, the corresponding heat energy in the heat exchanger cannot be exchanged in a timely manner. By placing the temperature sensor 14 on the heat exchanger, the evaporator's condition can be indirectly sensed without being affected by the cold energy released by the evaporator, further improving the heater's heating efficiency. Specifically, in order to improve the accuracy of the data sensed by the temperature sensor 14, the temperature sensor 14 is installed on the first manifold 8, specifically on the pipe section between the flat pipe 10 used to connect pipe A 11 and the flat pipe 10 used to connect pipe B 12.

[0030] Example 2 of a carbon dioxide heat pump water heater with a balanced heating tank:

[0031] like Figure 3As shown, the only difference between this embodiment and Embodiment 1 is the way the second manifold 9 divides pipe A 11 and pipe B 12. Specifically, pipe A 11 and pipe B 12 are two structurally independent pipes. By using two structurally independent pipes, the requirement that pipe A 11 and pipe B 12 are not connected is achieved. The two pipes can be operated and maintained independently, reducing the possibility of mutual interference. Independent manifolds can provide greater flexibility to adapt to different fluid conditions.

[0032] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A carbon dioxide heat pump water heater that equalizes the heating of the water tank, characterized by: The utility model provides a heat storage water tank (1), the top of the heat storage water tank (1) is provided with a water tank water inlet (2), the lower part is provided with a water tank water outlet (3), a heat exchanger is arranged around the heat storage water tank (1) to realize heat exchange, the refrigerant inlet pipe inlet (5) of the heat exchanger is located at the lower part of the heat storage water tank (1), and the refrigerant outlet pipe outlet (7) of the heat exchanger is located at the upper part of the heat storage water tank (1).

2. A carbon dioxide heat pump water heater of the type described in claim 1 wherein: The heat exchanger adopts a plate heat exchanger, which comprises a first header (8), a second header (9), a plurality of flat tubes (10), a refrigerant inlet pipe (4) and a refrigerant outlet pipe (6), one end of the flat tube (10) is communicated with the first header (8), the other end is communicated with the second header (9), and the plurality of flat tubes (10) are arranged in parallel on a vertical plane. The second header (9) comprises a non-communicating A pipe (11) and a B pipe (12) located below the A pipe (11), the A pipe (11) is used for being communicated with the refrigerant outlet pipe (6), and the B pipe (12) is used for being communicated with the refrigerant inlet pipe (4).

3. A carbon dioxide heat pump water heater of the type described in claim 2 wherein: A baffle (13) is further arranged in the second header (9), the pipe above the baffle (13) is the A pipe (11), and the pipe below the baffle (13) is the B pipe (12).

4. A carbon dioxide heat pump water heater of the type described in claim 2 wherein: The A pipe (11) and the B pipe (12) are two independent pipes.

5. A carbon dioxide heat pump water heater of the type described in claim 2 wherein: The number of the flat tubes (10) communicated by the A pipe (11) is less than the number of the flat tubes (10) communicated by the B pipe (12).

6. A carbon dioxide heat pump water heater of the type described in claim 2 wherein: A temperature sensing bag (14) is further arranged on the heat exchanger to detect the temperature of the heat exchanger, and the data output end of the temperature sensing bag (14) is connected with a defrosting system.

7. A carbon dioxide heat pump water heater of the type described in claim 6 wherein: The temperature sensing bag (14) is installed on the first header (8), and specifically, the temperature sensing bag (14) is installed on the pipe section between the flat tube (10) for communicating the A pipe (11) and the flat tube (10) for communicating the B pipe (12).

8. A carbon dioxide heat pump water heater of the type having an equalized heating tank according to any one of claims 1 to 7, characterized in that: The inlet of the refrigerant inlet pipe (4) of the heat exchanger is located below 1 / 2 of the height of the heat storage water tank (1), and the refrigerant outlet pipe outlet (7) of the heat exchanger is located between 1 / 2 and 4 / 5 of the height of the heat storage water tank (1).

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