Heat pump control method based on adjustable target superheat degree and air source heat pump

Abstract

The invention relates to a heat pump control method based on the adjustable target superheat degree and an air source heat pump. According to the control method, the environment temperature and the outlet water temperature are collected in real time, a target superheat degree compensation value is obtained according to the set target water temperature and a set target superheat degree compensation value model or an experiment data table, PID adjustment is conducted based on the target superheat degree compensation value, and the target superheat degree compensation value is obtained. The actual superheat degree can still be stabilized near the optimal target superheat degree under different working conditions, and therefore it is guaranteed that the unit can give full play to the maximum heating capacity under various working conditions; the target superheat degree is dynamically updated to be in the optimal state all the time according to the environment temperature and the outlet water temperature, so that the energy efficiency of the air source heat pump unit is remarkably improved, energy waste is reduced, and the use cost of a user is reduced.

Description

Technical Field

[0001] This invention relates to the field of heat pump control technology, and in particular to a heat pump control method based on adjustable target superheat and an air source heat pump. Background Technology

[0002] Air source heat pumps, as a highly efficient and clean heating and cooling technology, have been widely used in the building sector in recent years.

[0003] In the operation and control of air source heat pump units, the setting of the target superheat has a crucial impact on the unit's capacity and energy efficiency. Therefore, existing air source heat pumps typically use the target superheat as an important control parameter to control the compressor frequency.

[0004] However, in actual operating environments, parameters such as ambient temperature and water temperature can vary significantly with factors such as season, time, and geographical location. A fixed target superheat often cannot match the current operating conditions, making it difficult for the unit to fully utilize its maximum capacity under different operating conditions. The energy efficiency cannot reach the optimal level, resulting in energy waste and a decline in unit performance, which fails to meet users' needs for efficient operation of heat pump units. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide a heat pump control method based on adjustable target superheat. This control method is based on a target superheat compensation model of ambient temperature and water temperature difference to determine the corresponding target superheat compensation amount. Then, combined with the initial target superheat, the target superheat is adjusted in real time through a PID control algorithm to obtain the optimal target superheat under the current operating conditions. This enables the unit to fully utilize its maximum capacity under different operating conditions and achieve optimal energy efficiency.

[0006] A heat pump control method based on adjustable target superheat includes the following steps:

[0007] S1: Based on the current ambient temperature Target water temperature With outlet water temperature water temperature difference Determine the target overheat compensation value at the current moment. Based on the actual superheat at the current moment Set target overheat The superheat deviation at the current moment is calculated. ; S2: Based on the set target superheat Target overheat compensation value and superheat deviation The optimal target superheat S at the current moment is calculated using a PID control algorithm. S3: Adjust the opening of the electronic expansion valve according to the optimal target superheat S at the current moment.

[0008] Furthermore, the optimal target overheat S at the current moment satisfies: ; in: To set the target superheat, the unit is °C; The target superheat compensation value is expressed in °C. This is the proportionality coefficient; The integral coefficient; These are the differential coefficients; e(t) represents the superheat deviation at the current moment, in °C.

[0009] Furthermore, the target superheat compensation value Obtained through the following methods: S11A: Obtain the current ambient temperature Outlet water temperature and target water temperature The target water temperature was calculated. With outlet water temperature water temperature difference ; S12: Based on water temperature difference Ambient temperature Determine the target superheat compensation value .

[0010] Furthermore, based on the water temperature difference Ambient temperature Determine the target superheat compensation value Specifically, the target superheat compensation model employs the XGBoost algorithm. It uses extensive data from multiple units undergoing target superheat commissioning and operational testing at varying water and ambient temperatures as training and testing datasets. A mapping relationship is established between a feature list [ambient temperature, water temperature difference, set target superheat] and a label [target superheat compensation value]. This is based on the water temperature difference... Ambient temperature Obtain the predicted target superheat compensation value .

[0011] Furthermore, based on the water temperature difference Ambient temperature Determine the target superheat compensation value Specifically, the data is obtained by looking up the experimental data table based on the water temperature difference range and the ambient temperature range.

[0012] Further, step S1 includes the following sub-steps: S11A: Obtain the current ambient temperature Outlet water temperature and target water temperature The target water temperature was calculated. With outlet water temperature water temperature difference ; S11B: Obtain the actual overheat at the current moment. Set target overheat The superheat deviation at the current moment is calculated. ; S12: Based on water temperature difference Ambient temperature Determine the target superheat compensation value .

[0013] Furthermore, the water temperature difference satisfy: .

[0014] Furthermore, the current superheat deviation satisfy: .

[0015] Furthermore, when the controller of the air source heat pump adjusts the opening of the electronic expansion valve according to the optimal target superheat S, it follows the following: When the current optimal target superheat S is greater than the previous optimal target superheat S', the opening of the expansion valve should be appropriately reduced. When the current optimal target superheat S is smaller than the previous optimal target superheat S', the opening of the expansion valve should be appropriately increased.

[0016] Compared to existing technologies, this invention collects ambient temperature and outlet water temperature in real time, obtains the target superheat compensation value based on the set target water temperature, the set target superheat compensation value model, or experimental data table, and performs PID regulation based on this value. This ensures that the actual superheat remains stable near the optimal target superheat under different operating conditions, thereby guaranteeing that the unit can fully exert its maximum heating capacity under various operating conditions. The target superheat is always dynamically updated to the optimal state based on the ambient temperature and outlet water temperature, which significantly improves the energy efficiency of the air source heat pump unit, reduces energy waste, and lowers the user's operating costs.

[0017] Meanwhile, the present invention also provides an air source heat pump, including a compressor, a water-side heat exchanger, an electronic expansion valve, an air-side heat exchanger connected in sequence through a refrigerant circulation pipeline, a parameter detection module, and a controller communicatively connected to the electronic expansion valve and the parameter detection module; wherein, the parameter detection module includes a first temperature sensor and a second temperature sensor, the first temperature sensor being used to measure the outlet water temperature of the water-side heat exchanger, and the second temperature sensor being used to measure the ambient temperature, and the controller implementing the above-mentioned heat pump control method based on adjustable target superheat.

[0018] Compared with the prior art, the beneficial effects of the air source heat pump provided by the present invention are the same as those of the heat pump control method based on adjustable target superheat, and will not be repeated here. Attached Figure Description

[0019] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings.

[0020] Figure 1 This is a flowchart of the heat pump control method based on adjustable target superheat of the present invention. Detailed Implementation

[0021] The technical solutions of the present invention will now be clearly and completely described with reference to the accompanying drawings of the embodiments of the present invention. The described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0022] The air source heat pump of the present invention includes a compressor, a water-side heat exchanger, an electronic expansion valve, an air-side heat exchanger, and a parameter detection module, which are circulated and connected through a refrigerant pipeline, and a controller that is communicatively connected to the compressor, the electronic expansion valve, and the parameter detection module.

[0023] The parameter detection module includes a first temperature sensor and a second temperature sensor.

[0024] The first temperature sensor is installed at the outlet of the water working fluid pipeline of the water-side heat exchanger and is used to measure the outlet water temperature of the water-side heat exchanger. and the outlet water temperature is displayed in real time. Transmitted to the controller.

[0025] The second temperature sensor is used to measure the ambient temperature. And the ambient temperature is displayed in real time. Transmitted to the controller.

[0026] The controller, based on the received outlet water temperature Ambient temperature and target water temperature Obtain the target superheat compensation value Based on the target superheat compensation value Obtain the optimal target superheat based on PID control. .

[0027] Please see Figure 1 The controller obtains the optimal target superheat of the air source heat pump under heating conditions based on PID control in the following manner. Specifically, it includes the following steps.

[0028] S1: Based on the current ambient temperature Target water temperature With outlet water temperature water temperature difference Determine the target overheat compensation value at the current moment. Based on the actual superheat at the current moment Set target overheat The superheat deviation at the current moment is calculated. .

[0029] The specific implementation includes the following sub-steps.

[0030] S11A: Obtain the current ambient temperature Outlet water temperature and target water temperature The target water temperature was calculated. With outlet water temperature water temperature difference .

[0031] In practice, the data collection frequency can be set to 10s / time to 15s / time.

[0032] The water temperature difference satisfy: .

[0033] S11B: Obtain the actual overheat at the current moment. Set target overheat The superheat deviation at the current moment is calculated. .

[0034] The current superheat deviation satisfy: .

[0035] S12: Based on water temperature difference Ambient temperature Determine the target superheat compensation value .

[0036] In practice, the target superheat compensation value can be obtained using a target superheat compensation model or experimental data tables. .

[0037] The target superheat compensation model, employing the XGBoost algorithm, underwent extensive target superheat debugging and operational testing on multiple units under varying water temperature differences and ambient temperatures. This yielded a test dataset, and a mapping relationship was established between a feature list [ambient temperature, water temperature difference, set target superheat] and a label [target superheat compensation value]. After training and testing, the model can be used based on water temperature difference... Ambient temperature Predicted target superheat compensation value The target overheating compensation value is based on the difference between the optimal target overheating during the test run and the set target overheating.

[0038] The XGBoost algorithm is not a limitation of the target overheating compensation model; other machine learning and deep learning models, such as LightGBM and SVR, can also be used to achieve target prediction.

[0039] The experimental data table is based on extensive target superheat commissioning and operation test data from multiple units under various water temperature differences and ambient temperatures. Target superheat compensation values ​​are calculated according to the water temperature difference range and ambient temperature range. The statistical values ​​are set as shown in Table 1 in this embodiment.

[0040] Table 1

[0041] S2: Based on the set target superheat Target overheat compensation value and superheat deviation The optimal target superheat S at the current moment is calculated using a PID control algorithm.

[0042] The optimal target superheat S satisfies: ; in: The optimal target superheat at the current moment, in °C; To set the target superheat, the unit is °C; for example... = -1; The target superheat compensation value is expressed in °C. This is the proportionality coefficient; The integral coefficient; These are the differential coefficients; e(t) represents the superheat deviation at the current moment, in °C. Among them, the proportionality coefficient Integral coefficient and differential coefficients These parameters were determined through experimental debugging to ensure the speed and stability of the adjustment process. = 2.5, =0.1, =0.5.

[0043] S3: Adjust the opening of the electronic expansion valve according to the optimal target superheat S at the current moment.

[0044] When the controller of an air source heat pump adjusts the opening of the electronic expansion valve according to the optimal target superheat S, the following applies: When the current optimal target superheat S is greater than the previous optimal target superheat S', the opening of the expansion valve should be appropriately reduced to increase the actual superheat. ; When the current optimal target superheat S is smaller than the previous optimal target superheat S', the expansion valve opening should be appropriately increased to reduce the actual superheat. .

[0045] The above operation ensures that when the air-side heat exchanger is used as an evaporator, the actual superheat of the refrigerant at its outlet is stabilized near the optimal target superheat S.

[0046] Compared to existing technologies, this invention collects ambient temperature and outlet water temperature in real time, obtains the target superheat compensation value based on the set target water temperature, the set target superheat compensation value model, or experimental data table, and performs PID regulation based on this value. This ensures that the actual superheat remains stable near the optimal target superheat under different operating conditions, thereby guaranteeing that the unit can fully exert its maximum heating capacity under various operating conditions. The target superheat is always dynamically updated to the optimal state based on the ambient temperature and outlet water temperature, which significantly improves the energy efficiency of the air source heat pump unit, reduces energy waste, and lowers the user's operating costs.

[0047] This control method makes the adjustment of the target superheat more targeted and precise, enabling the air source heat pump unit to adapt to different operating environments and conditions, improving the adaptability and stability of the air source heat pump unit, and extending the service life of the unit.

[0048] The aforementioned heat pump control method based on adjustable target superheat is stored in an electronic device and executed by the electronic device to adjust the opening of the electronic expansion valve based on the optimal target superheat. The electronic device includes, but is not limited to, memory, processor, and network interface that can be interconnected via a system bus.

[0049] The memory includes at least one type of readable storage medium, including flash memory, hard disk, multimedia card, card-type memory (e.g., SD or DX memory), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, magnetic disk, optical disk, etc. The memory can be an internal storage unit of the electronic device, such as the hard disk or RAM of the electronic device. The memory can also be an external storage device of the electronic device, such as a plug-in hard disk, smart media card (SMC), secure digital card (SD), flash card, etc. The memory may also include both internal storage units and external storage devices of the electronic device.

[0050] The processor can be a central processing unit (CPU), controller, microcontroller, microprocessor, or other data processing chip. This processor is typically used to control the overall operation of the electronic device, such as performing control and processing related to data interaction or communication with the electronic device. The processor is used to run program code stored in the memory or process data, for example, to run the aforementioned heat pump control method based on adjustable target superheat.

[0051] The network interface may include a wireless network interface or a wired network interface, which is typically used to establish communication connections between the electronic device and other electronic devices. For example, the network interface is used to connect the electronic device to an external data platform via a network, establishing a data transmission channel and communication connection between the electronic device and the external data platform. The network may be an intranet, the Internet, Global System for Mobile communication (GSM), Wideband Code Division Multiple Access (WCDMA), 4G network, 5G network, Bluetooth, Wi-Fi, or other wireless or wired networks.

[0052] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0053] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" and "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0054] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and the present invention also intends to include these modifications and variations.

Claims

1. A heat pump control method based on adjustable target superheat, characterized in that, Includes the following steps: S1: Based on the current ambient temperature Target water temperature With outlet water temperature water temperature difference Determine the target overheat compensation value at the current moment. Based on the actual superheat at the current moment Set target overheat level The superheat deviation at the current moment is calculated. ; S2: Based on the set target superheat Target overheat compensation value and superheat deviation The optimal target superheat S at the current moment is calculated using a PID control algorithm. S3: Adjust the opening of the electronic expansion valve according to the optimal target superheat S at the current moment.

2. The heat pump control method based on adjustable target superheat as described in claim 1, characterized in that, The optimal target overheat S at the current moment satisfies: ； in: To set the target superheat, the unit is °C; The target superheat compensation value is expressed in °C. This is the proportionality coefficient; The integral coefficient; These are the differential coefficients; e(t) represents the superheat deviation at the current moment, in °C.

3. The heat pump control method based on adjustable target superheat according to claim 2, characterized in that, The target superheat compensation value Obtained through the following methods: S11A: Obtain the current ambient temperature Outlet water temperature and target water temperature ; The target water temperature was calculated. With outlet water temperature water temperature difference ; S12: Based on water temperature difference Ambient temperature Determine the target superheat compensation value .

4. The heat pump control method based on adjustable target superheat as described in claim 3, characterized in that, Based on water temperature difference Ambient temperature Determine the target superheat compensation value Specifically, the target superheat compensation model employs the XGBoost algorithm. It uses extensive data from multiple units undergoing target superheat commissioning and operational testing at varying water and ambient temperatures as training and testing datasets. A mapping relationship is established between a feature list [ambient temperature, water temperature difference, set target superheat] and a label [target superheat compensation value]. This is based on the water temperature difference... Ambient temperature Obtain the predicted target superheat compensation value .

5. The heat pump control method based on adjustable target superheat according to claim 3, characterized in that, Based on water temperature difference Ambient temperature Determine the target superheat compensation value Specifically, the data is obtained by looking up the experimental data table based on the water temperature difference range and the ambient temperature range.

6. The heat pump control method based on adjustable target superheat according to claim 1, characterized in that, Step S1 includes the following sub-steps: S11A: Obtain the current ambient temperature Outlet water temperature and target water temperature The target water temperature was calculated. With outlet water temperature water temperature difference ; S11B: Obtain the actual overheat at the current moment. Set target overheat level The superheat deviation at the current moment is calculated. ; S12: Based on water temperature difference Ambient temperature Determine the target superheat compensation value .

7. The heat pump control method based on adjustable target superheat as described in claim 6, characterized in that, The water temperature difference satisfy: 。 8. The heat pump control method based on adjustable target superheat according to claim 6, characterized in that, The current superheat deviation satisfy: 。 9. The heat pump control method based on adjustable target superheat according to claim 1, characterized in that, When the controller of an air source heat pump adjusts the opening of the electronic expansion valve according to the optimal target superheat S, the following applies: When the current optimal target superheat S is greater than the previous optimal target superheat S', the opening of the expansion valve should be appropriately reduced. When the current optimal target superheat S is smaller than the previous optimal target superheat S', the opening of the expansion valve should be appropriately increased.

10. An air source heat pump, comprising a compressor, a water-side heat exchanger, an electronic expansion valve, and an air-side heat exchanger connected sequentially via a refrigerant circulation pipeline, a parameter detection module, and a controller communicatively connected to the electronic expansion valve and the parameter detection module; wherein, The parameter detection module includes a first temperature sensor and a second temperature sensor. The first temperature sensor is used to measure the outlet water temperature of the water-side heat exchanger, and the second temperature sensor is used to measure the ambient temperature. The controller implements the heat pump control method based on adjustable target superheat as described in any one of claims 1 to 9.

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