Optimization design method for position of start-stop temperature sensing bulb relative to water tank, water tank and water heater

Abstract

The invention provides an optimization design method for the position of a start-stop temperature sensing bulb relative to a water tank, the water tank and a water heater, the optimization design method for the position of the start-stop temperature sensing bulb relative to the water tank comprises the following steps: establishing a relation table between the relative position of the start-stop temperature sensing bulb and a condenser and a preset hot water amount ratio, the preset hot water amount ratio is the ratio of the equivalent hot water amount capable of discharging the hot water at the preset temperature after the preset shutdown temperature is reached to the volume of the water tank, and the relative position is more than three values; a preset hot water amount ratio corresponding to the target hot water amount ratio is determined, and the difference value between the target hot water amount ratio and the corresponding preset hot water amount ratio is within a preset difference value range; and looking up the relation table, obtaining the relative position of the start-stop temperature sensing bulb and the condenser corresponding to the target hot water amount proportion, and arranging the start-stop temperature sensing bulb at the relative position. According to the optimization design method, on the premise that the hot water amount of a user is guaranteed, the heat exchange efficiency of the condenser side and the whole machine operation energy efficiency can be further optimized when the heat pump is started for heating, and therefore better energy saving performance is obtained.

Description

Technical Field

[0001] The invention relates to the field of water heaters, and in particular to an optimization design method for the position of a start-stop temperature sensing package relative to a water tank, a water tank and a water heater. Background Art

[0002] The relative position of the temperature sensing package that controls the start and stop of the heat pump on the water tank and the condenser components, as well as the start-stop temperature difference, directly affect the content of low-temperature water in the water tank, the amount of high-temperature hot water discharged, and the load state of the condenser side when the heat pump starts running. That is, it will affect the heat exchange efficiency on the condenser side when the heat pump starts heating, the energy efficiency of the entire machine, and the amount of hot water available to users.

[0003] In the existing scheme, it is impossible to reasonably set the position of the start-stop temperature sensor package. Therefore, when the start-stop temperature sensor package is set at the bottom or the start-stop temperature difference is set to a small value, the water temperature in the condenser area at the bottom of the water tank is at a high state. After the whole machine starts running, the heat exchange efficiency of the condenser is weakened, and the energy consumption of the whole machine increases. However, the amount of hot water in the water tank increases, and the amount of hot water that users can use at one time increases. Figure 1 As shown, when the start-stop temperature sensing package 11 is positioned close to the upper part or the start-stop temperature difference is set relatively large, the water temperature in the condenser area at the lower part of the water tank 12 is at a relatively low level. After the whole machine starts running, the heat exchange efficiency of the condenser 13 is improved, and the energy consumption of the whole machine is reduced. However, the amount of hot water in the water tank 12 is reduced, and the amount of hot water that the user can use at one time is reduced. Summary of the invention

[0004] The first purpose of the present invention is to provide an optimization design method for the position of the start-stop temperature sensing package relative to the water tank. This optimization design method can further optimize the heat exchange efficiency of the condenser side and the overall operating energy efficiency when the heat pump starts heating while ensuring the amount of hot water for users, thereby achieving better energy saving.

[0005] The second object of the present invention is to provide a water tank that adopts the above-mentioned optimization design method of the start-stop temperature sensing package relative to the water tank position.

[0006] A third object of the present invention is to provide a water heater having the above water tank.

[0007] To achieve the above-mentioned first purpose, the present invention provides an optimization design method for the position of the start-stop temperature sensing package relative to the water tank, including: establishing a relationship table between the relative position between the start-stop temperature sensing package and the condenser and the preset hot water volume ratio, the preset hot water volume ratio is the ratio of the amount of hot water equivalent to the preset temperature that can be released after reaching the preset shutdown temperature to the volume of the water tank, and the relative position can take more than three values; determining the preset hot water volume ratio corresponding to the target hot water volume ratio, and the difference between the target hot water volume ratio and the corresponding preset hot water volume ratio is within the preset difference range; looking up the relationship table, obtaining the relative position between the start-stop temperature sensing package and the condenser corresponding to the target hot water volume ratio and setting the start-stop temperature sensing package at the relative position.

[0008] It can be seen from the above scheme that by establishing a relationship table between the relative position between the start-stop temperature sensing package and the condenser and the preset hot water volume ratio, the relative position between the start-stop temperature sensing package and the condenser can be determined according to the value of the target hot water volume ratio, thereby ensuring that the start-stop temperature sensing package can be set at a suitable position. On the premise of ensuring the user's hot water volume, the heat exchange efficiency of the condenser side when the water heater starts heating and the energy efficiency of the entire machine operation are further optimized, thereby obtaining better energy saving.

[0009] A preferred solution is that the relationship table also includes the average operating COP value of the compressor after startup under the preset start-stop temperature difference corresponding to each relative position.

[0010] A further solution is that each relative position corresponds to more than two preset start-stop temperature differences.

[0011] It can be seen that the appropriate start-stop temperature difference can be set through the correspondence between the relative position and the average operating COP value after the compressor is started. Usually, at the same relative position, the start-stop temperature difference can be increased as much as possible to increase the average operating COP value after the compressor is started.

[0012] A further solution is to preset the start-stop temperature difference within the range of 2°C to 15°C.

[0013] A preferred solution is that the optimization design method further includes: determining a value of a preset start-stop temperature difference according to the determined relative position and an average operating COP value of the compressor corresponding to the relative position after startup.

[0014] It can be seen from this that, under the premise of ensuring the hot water supply to users, the heat exchange efficiency on the condenser side and the energy efficiency of the entire machine when the water heater starts heating can be further optimized, thereby achieving better energy saving.

[0015] A preferred solution is that the relative position takes more than five values.

[0016] It can be seen that by setting more relative position value points, the position of the start-stop temperature sensing package can be located more accurately.

[0017] A further solution is that when the start-stop temperature sensing package is set at the bottom of the condenser, the relative position value is 0; when the start-stop temperature sensing package is set at the top of the condenser, the relative position value is 1.

[0018] It can be seen from this that it is necessary to ensure that the start-stop temperature sensing package is set within the height range of the condenser.

[0019] A preferred solution is that the relationship table also includes the amount of hot water equivalent to the preset temperature hot water that can be released after reaching the preset shutdown temperature corresponding to each relative position.

[0020] To achieve the above-mentioned second purpose, the present invention provides a water tank, including a water tank inner body, a condenser and a start-stop temperature sensing package. The condenser is mounted on the outside of the water tank inner body, and a cold water inlet and a hot water outlet are provided on the water tank inner body. The position of the start-stop temperature sensing package relative to the water tank is determined by the optimization design method as mentioned above.

[0021] To achieve the third objective, the present invention provides a water heater including the water tank described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an existing water tank.

[0023] Figure 2 It is a structural schematic diagram of a water tank embodiment of the present invention.

[0024] Figure 3 It is a flow chart of an embodiment of the optimization design method of the present invention.

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0026] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully express the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, rather than as limitations.

[0027] The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] In the present invention, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices but have an intermediate device.

[0029] All terms (including technical terms or scientific terms) used in the present invention have the same meanings as those understood by ordinary technicians in the field, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0030] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0031] The water heater of this embodiment is a heat pump water heater, and the water heater includes a water tank and a compressor.

[0032] See also Figure 2 The water tank includes a water tank inner body 2, a condenser 3 and a start-stop temperature sensing package 4. The condenser 3 is sleeved on the outside of the water tank inner body 2 and is located in the middle of the height direction of the water tank inner body 2. The condenser 3 is connected to the compressor. A cold water inlet 21 and a hot water outlet 22 are provided on the water tank inner body 2. The cold water inlet 21 is located below the condenser 3, and the hot water outlet 22 is located above the condenser 3. The start-stop temperature sensing package 4 is located inside the water tank inner body 2 and is located within the height range of the condenser 3 in the vertical direction. The start-stop temperature sensing package 4 is used to detect the water temperature inside the water tank inner body 2. The controller of the water heater is electrically connected to the start-stop temperature sensing package 4 to control the opening and closing of the water heater according to the detection value of the start-stop temperature sensing package 4. The position of the start-stop temperature sensing package 4 relative to the water tank is determined by the following optimization design method. The middle does not refer to the exact middle position, but the middle position or the upper middle position or the lower middle position.

[0033] See also Figure 3The optimization design method of the start-stop temperature sensing package 4 relative to the water tank position in this embodiment includes the following steps:

[0034] First, execute step S1 to establish a relationship table between the relative position of the start-stop temperature sensing package 4 and the condenser 3 and the preset hot water volume ratio, such as Table 1. The preset hot water volume ratio is the ratio of the amount of hot water equivalent to the preset temperature that can be released after reaching the preset shutdown temperature to the volume of the water tank. In this embodiment, the preset shutdown temperature is 49°C, the preset temperature hot water equivalent is 45°C hot water equivalent, and the preset hot water volume ratio is the ratio of the amount of hot water equivalent to 45°C that can be released after shutdown at 49°C to the volume of the water tank. The relative position takes more than three values, preferably, the relative position takes more than five values. By setting more relative position value points, the position of the start-stop temperature sensing package 4 can be more accurately located. In this embodiment, the relative position includes five values, namely 0, 0.25, 0.5, 0.75, and 1. When the start-stop temperature sensing bag 4 is set at the bottom of the condenser 3, the relative position value is 0; when the start-stop temperature sensing bag 4 is set at 1 / 4 of the height of the condenser 3, the relative position value is 0.25; when the start-stop temperature sensing bag 4 is set at the midpoint of the height of the condenser 3, the relative position value is 0.5; when the start-stop temperature sensing bag 4 is set at 3 / 4 of the height of the condenser 3, the relative position value is 0.75; when the start-stop temperature sensing bag 4 is set at the top of the condenser 3, the relative position value is 1.

[0035] Next, step S2 is performed to determine the preset hot water volume ratio corresponding to the target hot water volume ratio, and the difference between the target hot water volume ratio and the corresponding preset hot water volume ratio is within a preset difference range, and optionally, the preset difference range is within a range of -2% to 2%. That is, the preset hot water volume ratio closest to the target hot water volume ratio in the relationship table is selected as the corresponding preset hot water volume ratio.

[0036] Next, step S3 is executed to query the previously prepared relationship table, obtain the relative position of the start-stop temperature sensing package 4 and the condenser 3 corresponding to the target hot water volume ratio, and set the start-stop temperature sensing package 4 at the relative position.

[0037] The relationship table also includes the amount of hot water equivalent to the preset temperature hot water that can be released after reaching the preset shutdown temperature corresponding to each relative position, and the average operating COP value of the compressor after starting under the preset start-stop temperature difference corresponding to each relative position. Optionally, each relative position corresponds to more than two preset start-stop temperature differences. In this embodiment, each relative position corresponds to three preset start-stop temperature differences, which are 2°C, 4°C and 6°C respectively. The appropriate preset start-stop temperature difference is set by the correspondence between the determined relative position of the start-stop temperature sensing package 4 and the average operating COP value of the compressor after starting corresponding to the relative position. Preferably, the preset start-stop temperature difference is in the range of 2°C to 15°C.

[0038] Table 1 takes a 270L water tank inner body 2 as an example, and sets the start-stop temperature sensing package 4 at five positions for testing. After the heat pump water heater starts running, the start-stop temperature sensing package 4 stops when it reaches 49°C, and the relationship table shown in Table 1 is obtained. It should also be noted that during the test, only one start-stop temperature sensing package is set at one relative position each time. After completing the test of one relative position, the start-stop temperature sensing package is set at the second relative position.

[0039] Table 1 Relationship between the relative position between the start-stop temperature sensing package and the condenser and the proportion of the preset hot water volume

[0040]

[0041]

[0042] For example, in order to ensure that users have enough hot water, when the equivalent water output of 45°C hot water is 80% of the water tank volume, that is, when the preset hot water volume corresponding to the target hot water volume ratio is 80%, the relative position of the start-stop temperature sensing package 4 and the condenser 3 can be optimized to 0.5 to improve the operating energy efficiency of the whole machine. At the same time, for the preset start-stop temperature difference of the start-stop temperature sensing package 4 at this position, the preset start-stop temperature difference can be increased as much as possible to further improve the operating energy efficiency of the whole machine. Preferably, when the relative position is 0.5, the preset start-stop temperature difference is set to 6°C.

[0043] It can be seen from the above that by establishing a relationship table between the relative position between the start-stop temperature sensing package and the condenser and the preset hot water volume ratio, the relative position between the start-stop temperature sensing package and the condenser can be determined according to the value of the target hot water volume ratio, thereby ensuring that the start-stop temperature sensing package can be set at a suitable position. On the premise of ensuring the user's hot water volume, the heat exchange efficiency of the condenser side when the water heater starts heating and the energy efficiency of the entire machine operation are further optimized, thereby obtaining better energy saving.

[0044] Finally, it should be emphasized that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. The optimization design method of the start-stop temperature sensing package relative to the water tank is characterized by: include: Establish a relationship table between the relative position between the start-stop temperature sensing package and the condenser and the preset hot water volume ratio, wherein the preset hot water volume ratio is the ratio of the amount of hot water equivalent to the preset temperature that can be released after reaching the preset shutdown temperature to the water tank volume, and the relative position can take more than three values; Determine a preset hot water volume ratio corresponding to the target hot water volume ratio, wherein the difference between the target hot water volume ratio and the corresponding preset hot water volume ratio is within a preset difference range; The relationship table is checked to obtain the relative position between the start-stop temperature sensing package and the condenser corresponding to the target hot water volume ratio, and the start-stop temperature sensing package is set at the relative position.

2. The optimization design method according to claim 1, characterized in that: The relationship table also includes an average operating COP value of the compressor after startup under the preset start-stop temperature difference corresponding to each relative position.

3. The optimization design method according to claim 2, characterized in that: Each of the relative positions corresponds to more than two preset start-stop temperature differences.

4. The optimization design method according to claim 2, characterized in that: The preset start-stop temperature difference is in the range of 2°C to 15°C.

5. The optimization design method according to any one of claims 2 to 4, characterized in that: The optimization design method also includes: The value of the preset start-stop temperature difference is determined according to the determined relative position and the average operating COP value of the compressor after startup corresponding to the relative position.

6. The optimization design method according to any one of claims 1 to 4, characterized in that: The relative position can take five or more values.

7. The optimization design method according to any one of claims 1 to 4, characterized in that: When the start-stop temperature sensing package is set at the bottom of the condenser, the relative position value is 0; When the start-stop temperature sensing package is set at the top of the condenser, the relative position value is 1.

8. The optimization design method according to any one of claims 1 to 4, characterized in that: The relationship table also includes the amount of hot water equivalent to the preset temperature hot water that can be released after reaching the preset shutdown temperature corresponding to each relative position.

9. A water tank, comprising a water tank inner body, a condenser and a start-stop temperature sensing package, wherein the condenser is sleeved on the outer side of the water tank inner body, and a cold water inlet and a hot water outlet are provided on the water tank inner body; Features: The position of the start-stop temperature sensing package relative to the water tank is determined by the optimization design method described in any one of claims 1 to 8.

10. A water heater, characterized in that Comprising a water tank as claimed in claim 9.

Images