Air source heat pump system control method for hybrid heat supply and air source heat pump system

Abstract

The invention relates to the technical field of air source heat pumps, in particular to a hybrid heat supply air source heat pump system control method and an air source heat pump system. According to the air source heat pump system, the heat storage water tank, the cold water tank and the combined compressor are additionally arranged, so that mixed heat supply is carried out on the using environment, the air source heat pump system stably and reliably operates under the condition that the air source heat pump system is high and does not need to be started and stopped frequently, and the problems of low efficiency and high destructiveness of the air source heat pump system under low frequency and frequent starting are solved; moreover, the heat storage water tank and the compressor supply heat in a mixed mode, the situation that the heat supply load is suddenly increased can be rapidly met, and the heat supply performance of the system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air source heat pumps, and more specifically, to a control method and an air source heat pump system for hybrid heating. Background Art

[0002] As an efficient and clean heating and cooling technology, air source heat pumps have been widely used in the building field in recent years. How to efficiently design the application scenarios and solution designs has become the key research object of major heat pump manufacturers. Among them, how to maintain the air source heat pump system operating at an optimal energy efficiency point (mainly the compressor operating frequency) under different load demands has become a major problem to be solved at present.

[0003] As an efficient heat energy conversion device, air source heat pumps have been widely used in heating and hot water supply. However, in ultra-low temperature environments, traditional air source heat pump application designs often involve shutting down when reaching a certain temperature or operating at a lower compressor frequency under low load conditions. Whether it is frequent start-stop when reaching the temperature or the compressor operating at a lower frequency, it will bring problems such as low operating energy efficiency and poor system reliability. Especially in the scenario where the household load changes greatly, the system cannot quickly meet the customer's demand for heating and ventilation, resulting in the phenomenon of "heat pump not heating". Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the existing air source heat pump control system for hybrid heating, such as low operating energy efficiency and poor system reliability, and to provide a control method and an air source heat pump system for hybrid heating, which effectively improve the operating energy efficiency of the air source heat pump system for hybrid heating and improve the system stability.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0006] Provide a control method for an air source heat pump system for hybrid heating, including the following steps:

[0007] Start the air source heat pump system for hybrid heating, and obtain the compressor outlet water temperature and the target water temperature data required by the user;

[0008] According to the detected current temperature value, set the operating frequency of the compressor under the current load, so that the compressor operates at the maximum operating frequency under the current load. At this time, the air source heat pump system continuously heats the hot water storage tank while meeting the indoor heating demand;

[0009] When the load of the air source heat pump system continuously decreases and the temperature of the hot water storage tank has not reached the set first threshold, the compressor operates at the optimal operating frequency. At this time, the air source heat pump system continuously heats the hot water storage tank while meeting the indoor heating demand;

[0010] When the temperature of the hot water storage tank reaches the set first threshold:

[0011] If the load required by the user suddenly increases, the compressor is set to operate at the maximum operating frequency under the current load, and at the same time, the hot water storage tank is turned on. Combined heating is carried out by the compressor and the hot water storage tank to rapidly increase the temperature of the environment stably to meet the heating demand of the customer;

[0012] If the user only needs to maintain the current indoor temperature, the compressor is turned off, and the hot water storage tank and the cold water tank are used for combined heating.

[0013] A control method for an air source heat pump system with combined heating provided by the present invention realizes combined heating of the use environment by adding a hot water storage tank and a cold water tank and combining with a compressor, enabling the air source heat pump system to operate stably and reliably at a relatively high level without frequent start and stop, solving the problems of low efficiency and high destructiveness of the air source heat pump at low frequency and frequent start; moreover, through combined heating of the hot water storage tank and the compressor, it can quickly meet the sudden increase in heating load and improve the heating performance of the system.

[0014] In the present invention, only when the temperature of the hot water storage tank reaches the first threshold and the required load is low, the compressor will be turned off, and there is no need to frequently start and stop the compressor, enabling the system to operate stably; in the present invention, the volume of the hot water storage tank is large, which can maintain the heating demand for a long period of time; adding combined heating with the hot water storage tank can enable the compressor to operate at the optimal operating frequency most of the time, not only making the system operation more stable, but also avoiding frequent start and stop of the compressor.

[0015] It should be noted that in the present invention, the maximum operating frequency refers to the maximum frequency at which the compressor can operate under the current load; the optimal operating frequency refers to the operating frequency at which the compressor can operate stably, meet the heating demand, and have relatively low energy consumption at the same time.

[0016] Preferably, according to the peak and valley times of the municipal power grid, on the premise of meeting the indoor heating demand, the compressor is set to be turned on during the valley time and turned off during the peak time; during the valley time, if the temperature value of the hot water storage tank is less than or equal to the first threshold, the compressor operates stably at the optimal operating frequency and heats the hot water storage tank at the same time; if not, the compressor is turned off. According to the peak and valley of the municipal power grid, the air source heat pump system is set to operate stably at the optimal operating efficiency during the valley time. First, the compressor directly supplies heat to meet the customer's use demand. After reaching the target water temperature, the compressor continues to operate at the optimal operating efficiency and heats the hot water storage tank at the same time. Through continuous cyclic heating, when the water temperature of the hot water storage tank reaches the first threshold, the compressor is turned off.

[0017] Preferably, when the temperature of the hot water storage tank has not reached the first threshold, if the user demand load changes greatly, the compressor first operates at the maximum operating frequency under the current load at high load. After meeting the load demand and entering the low load, the compressor operates at the optimal operating frequency and heats the hot water storage tank at the same time.

[0018] In the present invention, when the difference between the monitored indoor environmental temperature and the target set temperature is large, that is, when the demand load is large, the system operates at a high frequency according to the operating parameters. However, because the load changes greatly, there are rarely cases of continuously operating at a high load. Therefore, after meeting the high heating load demand and entering a low load demand, it is necessary to reduce the frequency to the optimal operating frequency and open the passage for the compressor to supply heat to the hot water storage tank, using the compressor to maintain the room temperature and heat the hot water storage tank at the same time, avoiding the situation where the compressor operates at an ultra-high frequency for a while and then at a low frequency or even stops.

[0019] Preferably, for the scenario where the user demand load is large, if the temperature of the hot water storage tank reaches the first threshold, the compressor operates at the maximum operating frequency under the current load, and the hot water storage tank is opened at the same time, using the hot water storage tank and the compressor to supply heat together; if the temperature of the hot water storage tank has not reached the first threshold, the compressor operates at the maximum operating frequency under the current load and heats the hot water storage tank at the same time.

[0020] For the scenario where the user demand load is medium, if the temperature of the hot water storage tank reaches the first threshold, the compressor operates at the optimal operating frequency, and the hot water storage tank is opened at the same time, using the hot water storage tank and the compressor to supply heat together; if the temperature of the hot water storage tank has not reached the first threshold, the compressor operates at the optimal operating frequency and heats the hot water storage tank at the same time.

[0021] For the scenario where the user demand load is low, if the temperature of the hot water storage tank reaches the first threshold, the hot water storage tank and the cold water tank are opened at the same time, using the hot water storage tank and the cold water tank to supply heat in a mixed way; if the temperature of the hot water storage tank has not reached the first threshold, the compressor operates at the optimal operating frequency and heats the hot water storage tank at the same time.

[0022] In the present invention, the hot water storage tank has been heated to the first threshold during the off-peak time of the commercial power wave. During the peak time, if the load demand is very large, the hot water storage tank and the compressor supply heat in a mixed way. At this time, the compressor operates at the maximum operating frequency under the current large load to ensure that the customer demand can be met faster. Usually, the large load demand does not last for a long time. When the load demand gradually decreases, the compressor operates at the optimal operating frequency to reduce energy consumption; for the case of medium load, the compressor operates at the optimal operating frequency and jointly supplies heat with the hot water storage tank; for the case of low load demand, such as only maintaining the current room temperature, the compressor can be turned off and the hot water storage tank and the cold water tank supply heat in a mixed way.

[0023] Preferably, after the air source heat pump system is turned on, according to the outlet water temperature T1 and the target water temperature T2, the compressor operates at the maximum operating frequency under the current load of the compressor to meet the indoor heating demand while continuously heating the hot water storage tank;

[0024] Judge whether the difference between the target water temperature value T2 and the outlet water temperature value T1 is greater than or equal to the first set value X1:

[0025] If so, when T3≥N, continue to operate the compressor at the maximum operating frequency of the compressor under the current load, and at the same time turn on the mixed heating of the hot water storage tank; when T3<N, continue to operate the compressor at the maximum operating frequency of the compressor under the current load to meet the indoor heating demand while continuously heating the hot water storage tank;

[0026] If not, then judge whether the difference between the target water temperature value T2 and the outlet water temperature value T1 is greater than or equal to the second set value X2, X2 is less than X1, and whether the temperature T3 of the hot water storage tank reaches the first threshold value N:

[0027] If T3≥N and T2 - T1<X2, turn off the compressor and use the mixed heating of the hot water storage tank and the cold water tank;

[0028] If T3≥N and X1>T2 - T1≥X2, the compressor operates at the optimal operating frequency, and at the same time turn on the mixed heating of the hot water storage tank;

[0029] If T3<N and X1>T2 - T1≥X2, the compressor operates at the optimal operating frequency to meet the indoor heating demand while continuously heating the hot water storage tank.

[0030] Preferably, the first threshold is 90°C to 100°C. Usually, the first threshold is selected as 100°C.

[0031] Preferably, the optimal operating frequency is 55HZ to 65HZ; the maximum operating frequency is greater than the optimal operating frequency. According to experience, when the compressor operates at 60HZ, the system has high stability and low energy consumption.

[0032] Preferably, the first set value is 10°C to 15°C, and the second set value is 3°C to 7°C. When the difference between the target temperature and the outlet water temperature is large, it means that the user's demand load is large.

[0033] The present invention also provides an air source heat pump system for hybrid heating, which includes a controller, a compressor, a user-side coil pipe, a hot water storage tank, and a cold water tank; the water outlet end of the compressor is communicated with the water inlet end of the user-side coil pipe through a first water pipe, and the water outlet end of the user-side coil pipe is communicated with the water inlet end of the compressor through a second water pipe; a first electromagnetic three-way valve and a mixing valve are respectively arranged on the first water pipe, the water inlet end of the hot water storage tank is communicated with the first electromagnetic three-way valve, the water outlet end of the hot water storage tank is communicated with the cold water tank through a third water pipe, a second electromagnetic three-way valve is arranged on the third water pipe, the second electromagnetic three-way valve is communicated with the mixing valve through a fourth water pipe, and the controller is respectively in communication connection with the compressor, the first electromagnetic three-way valve, and the second electromagnetic three-way valve; a computer program is stored in the controller, and when the controller executes the computer program, the control method of the air source heat pump system for hybrid heating described above is realized.

[0034] Preferably, a temperature sensing probe is further included, and temperature sensing probes are installed at the hot water storage tank, the user-side coil pipe, and the water outlet end of the compressor, and the temperature sensing probe is in communication connection with the controller.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] 1. The control method of the air source heat pump system for hybrid heating of the present invention realizes hybrid heating of the use environment by adding a hot water storage tank and a cold water tank and combining with the compressor, enabling the air source heat pump system to operate stably and reliably at a relatively high level without frequent start and stop, solving the problems of low efficiency and high destructiveness of the air source heat pump in low frequency and frequent start; moreover, through the hybrid heating of the hot water storage tank and the compressor, it can quickly meet the sudden increase in heating load and improve the heating performance of the system.

[0037] 2. The control method of the air source heat pump system for hybrid heating of the present invention combines the situation of the peak and trough of the municipal power wave, and through the opening setting conditions of the compressor, enables the unit to store corresponding heat during the trough, and only shuts down the compressor under low load or when only maintaining the room temperature. Description of the Drawings

[0038] Figure 1 It is a schematic flowchart of the method of Embodiment 1 of the present invention;

[0039] Figure 2 It is a schematic structural diagram of the system of Embodiment 3 of the present invention.

[0040] In the drawings: 1. Compressor; 2. User-side coil pipe; 3. Hot water storage tank; 4. Cold water tank; 5. First water pipe; 6. Second water pipe; 7. First electromagnetic three-way valve; 8. Second electromagnetic three-way valve; 9. Mixing valve. Detailed Embodiments

[0041] The present invention will be further described below in conjunction with specific embodiments. Among them, the attached drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation on this patent; in order to better illustrate the embodiments of the present invention, some components in the attached drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted.

[0042] In the attached drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the attached drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the attached drawings are only for illustrative purposes and should not be construed as a limitation on this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0043] Embodiment 1

[0044] This embodiment is the first embodiment of a control method for an air source heat pump system with hybrid heating. To solve the above technical problems, the technical solution adopted by the present invention is:

[0045] As Figure 1 shown, a control method for an air source heat pump system with hybrid heating is provided, including the following steps:

[0046] Start the air source heat pump system with hybrid heating, and read out the outlet water temperature and target water temperature data;

[0047] According to the detected current temperature value, set the operating frequency of compressor 1 under the current load, so that compressor 1 operates at the maximum operating frequency under the current load. At this time, the air source heat pump system continuously heats the hot water storage tank 3 while meeting the indoor heating demand;

[0048] When the load of the air source heat pump system continuously decreases and the temperature of the hot water storage tank 3 has not reached the set first threshold, compressor 1 continues to operate and operates at the optimal operating frequency. At this time, the air source heat pump system continuously heats the hot water storage tank 3 while meeting the indoor heating demand;

[0049] When the temperature of the hot water storage tank 3 reaches the set first threshold:

[0050] If the load required by the user suddenly increases, it is set that the compressor 1 operates at the maximum operating frequency under the current load, and at the same time, the hot water storage tank 3 is turned on. Combined heating is carried out through the compressor 1 and the hot water storage tank 3 to rapidly increase the temperature of the environment stably to meet the heating requirements of the customer;

[0051] If the user only needs to maintain the current indoor temperature, the compressor 1 is turned off, and the hot water storage tank 3 and the cold water tank 4 are used for combined heating.

[0052] In the present invention, only when the temperature of the hot water storage tank 3 reaches the first threshold and the required load is low, the compressor 1 will be turned off, and there is no need to frequently start and stop the compressor 1, enabling the system to operate stably; in the present invention, the volume of the hot water storage tank 3 is large and can maintain the heating requirements for a relatively long period of time; adding the hot water storage tank 3 for combined heating can enable the compressor 1 to operate at the optimal operating frequency for most of the time, not only making the system operation more stable, but also avoiding frequent start and stop of the compressor 1.

[0053] It should be noted that in the present invention, the maximum operating frequency refers to the maximum frequency at which the compressor 1 can operate under the current load; the optimal operating frequency refers to the operating frequency at which the compressor 1 can operate stably, can meet the heating requirements, and has relatively low energy consumption at the same time.

[0054] In this embodiment, according to the peak and valley times of the commercial power, on the premise of meeting the indoor heating requirements, it is set that the compressor 1 is turned on during the valley time and turned off during the peak time; during the valley time, if the temperature value of the hot water storage tank 3 is less than or equal to the first threshold, the compressor 1 operates stably at the optimal operating frequency and heats the hot water storage tank 3 at the same time; if not, the compressor 1 is turned off. According to the peak and valley of the commercial power, it is set that the air source heat pump system operates stably at the optimal operating efficiency during the valley time. First, the compressor 1 is used for direct heating to meet the customer's use requirements. After reaching the target water temperature, the compressor 1 continues to operate at the optimal operating efficiency and heats the hot water storage tank 3 at the same time. The continuous cyclic heating makes the water temperature of the hot water storage tank 3 reach the first threshold, and then the compressor 1 is turned off.

[0055] In this embodiment, when the temperature of the hot water storage tank 3 has not reached the first threshold, if the user's required load changes greatly, the compressor 1 first operates at the maximum operating frequency under the current load at high load. After meeting the load requirements, when entering the low load, the compressor 1 operates at the optimal operating frequency and heats the hot water storage tank 3 at the same time. Preferably, the first threshold is 90°C to 100°C. In this embodiment, the first threshold is selected as 100°C. Preferably, the optimal operating frequency is 55HZ to 65HZ; the maximum operating frequency is greater than the optimal operating frequency. According to experience, when the compressor 1 operates at 60HZ, the system has high stability and low energy consumption.

[0056] As shown in Table 1 below, it is the ambient temperature operation table of the compressor 1 obtained based on experience, that is, the maximum operating frequency at which the compressor 1 can operate under different loads.

[0057] Table 1 Compressor Ambient Temperature Operation Table

[0058] ≤40℃ (40,45] (45,50] (50,55] (55,60] (60,65] ＞65℃ -35℃＜T＜-25℃ 84 90 86 88 86 60 60 -25℃≤T＜-15℃ 84 90 86 88 86 60 60 -15℃≤T＜-3℃ 90 88 84 86 84 60 60 -3℃≤T＜-7℃ 86 84 82 82 80 60 60 7℃≤T＜15℃ 80 76 74 74 72 60 60 15℃≤T＜27℃ 70 68 68 68 66 60 60 27℃≤T＜43℃ 66 64 64 64 62 60 60

[0059] In this embodiment, a temperature sensor probe is further included. Temperature sensor probes are installed at the hot water storage tank 3, the user-side coil pipe 2, and the water outlet end of the compressor 1, and the temperature sensor probes are communicatively connected to the controller.

[0060] In the present invention, when the difference between the monitored indoor environmental temperature and the target set temperature is large, that is, when the demand load is large, the system operates at a high frequency according to the operating parameters. However, because the load changes greatly, there is rarely a situation of continuously operating at a high load. Therefore, after meeting the high heating load demand, when entering a low load demand, it is necessary to reduce the frequency to the optimal operating frequency and open the passage for the compressor 1 to supply heat to the hot water storage tank 3, and use the compressor 1 to maintain the room temperature and heat the hot water storage tank 3 at the same time, avoiding the situation that the compressor 1 operates at an extremely high frequency for a while and then at a low frequency or even stops.

[0061] In this embodiment, the compressor 1 and the hot water storage tank 3 are used for combined heating. It is mainly divided into the following three types of scenarios:

[0062] 1. For the scenario where the user demand load is large, if the temperature of the hot water storage tank 3 reaches the first threshold, the compressor 1 operates at the maximum operating frequency under the current load, and at the same time, the hot water storage tank 3 is opened, and the hot water storage tank 3 and the compressor 1 are used for combined heating; if the temperature of the hot water storage tank 3 does not reach the first threshold, the compressor 1 operates at the maximum operating frequency under the current load and heats the hot water storage tank 3 at the same time.

[0063] 2. For the scenario where the user demand load is medium, if the temperature of the hot water storage tank 3 reaches the first threshold, the compressor 1 operates at the optimal operating frequency, and at the same time, the hot water storage tank 3 is opened, and the hot water storage tank 3 and the compressor 1 are used for combined heating; if the temperature of the hot water storage tank 3 does not reach the first threshold, the compressor 1 operates at the optimal operating frequency and heats the hot water storage tank 3 at the same time.

[0064] 3. For the scenario where the user demand load is low, if the temperature of the hot water storage tank 3 reaches the first threshold, the hot water storage tank 3 and the cold water tank 4 are opened at the same time, and the hot water storage tank 3 and the cold water tank 4 are used for combined heating; if the temperature of the hot water storage tank 3 does not reach the first threshold, the compressor 1 operates at the optimal operating frequency and heats the hot water storage tank 3 at the same time.

[0065] In the present invention, the hot water storage tank 3 has been heated to the first threshold during the valley time of the commercial power grid. During the peak time, if the load demand is very large, the hot water storage tank 3 and the compressor 1 are used for combined heating. At this time, the compressor 1 operates at the maximum operating frequency under the current large load to ensure that the customer demand can be met more quickly. Usually, the large load demand does not last for a long time. When the load demand gradually decreases, the compressor 1 operates at the optimal operating frequency to reduce energy consumption. For the case of medium load, the compressor 1 operates at the optimal operating frequency and combines with the hot water storage tank 3 for combined heating. For the case of low load demand, such as only maintaining the current room temperature, the compressor 1 can be turned off, and the hot water storage tank 3 and the cold water tank 4 are used for combined heating.

[0066] In summary, a control method for an air source heat pump system with combined heating provided in this embodiment realizes combined heating of the usage environment by adding a hot water storage tank 3, a cold water tank 4, and combining with the compressor 1, enabling the air source heat pump system to operate stably and reliably under a relatively high condition without frequent start and stop, solving the problems of low efficiency and high destructiveness of the air source heat pump under low frequency and frequent start; moreover, through the combined heating of the hot water storage tank 3 and the compressor 1, the sudden increase in the heating load can be quickly satisfied, improving the heating performance of the system.

[0067] Embodiment 2

[0068] This embodiment is the second embodiment of a control method for an air source heat pump system with combined heating. This embodiment is similar to Embodiment 1. In this embodiment, the control steps include:

[0069] After the air source heat pump system is turned on, according to the outlet water temperature T1 and the target water temperature T2, the compressor 1 is operated at the maximum operating frequency under the current load of the compressor 1 to meet the indoor heating demand and continuously heat the hot water storage tank 3 at the same time;

[0070] Judge whether the difference between the target water temperature value T2 and the outlet water temperature value T1 is greater than or equal to the first set value X1:

[0071] If it is, when T3≥N, continue to operate the compressor 1 at the maximum operating frequency under the current load of the compressor 1, and at the same time turn on the hot water storage tank 3 for combined heating; when T3<N, continue to operate the compressor 1 at the maximum operating frequency under the current load of the compressor 1 to meet the indoor heating demand and continuously heat the hot water storage tank 3 at the same time;

[0072] If not, then judge whether the difference between the target water temperature value T2 and the outlet water temperature value T1 is greater than or equal to the second set value X2, X2 is less than X1, and whether the temperature T3 of the hot water storage tank 3 reaches the first threshold N:

[0073] If T3≥N and T2 - T1<X2, turn off the compressor 1 and use the hot water storage tank 3 and the cold water tank 4 for combined heating;

[0074] If T3≥N and X1>T2 - T1≥X2, the compressor 1 operates at the optimal operating frequency, and the hot water storage tank 3 is simultaneously turned on for combined heating.

[0075] If T3<N and X1>T2 - T1≥X2, the compressor 1 operates at the optimal operating frequency, continuously heating the hot water storage tank 3 while meeting the indoor heating demand.

[0076] In this embodiment, when the temperature of the hot water storage tank 3 has not reached the first threshold, if the user demand load changes greatly, the compressor 1 first operates at the maximum operating frequency under the current load. After meeting the load demand and entering the low load, the compressor 1 operates at the optimal operating frequency and heats the hot water storage tank 3 simultaneously.

[0077] In this embodiment, the peak and valley times of the local city power wave are set. Under the condition of meeting the indoor heating demand, the compressor 1 is turned on or off according to the set time; if it is in the valley time and the temperature of the hot water storage tank 3 is less than the first threshold, the compressor 1 operates at the optimal operating frequency to meet the indoor heating and heat the hot water storage tank 3 simultaneously; otherwise, the compressor is turned off.

[0078] In this embodiment, the first set value is 10℃ - 15℃, and the second set value is 3℃ - 7℃. When the difference between the target temperature and the outlet water temperature is large, it indicates that the user demand load is large.

[0079] Embodiment III

[0080] This embodiment is an embodiment of an air source heat pump system for combined heating. In this embodiment, the provided technical solution includes:

[0081] As Figure 2 shown, an air source heat pump system for combined heating includes a controller, a compressor 1, a user - side coil pipe 2, a hot water storage tank 3, and a cold water tank 4; the water outlet end of the compressor 1 is communicated with the water inlet end of the user - side coil pipe 2 through a first water pipe 5, and the water outlet end of the user - side coil pipe 2 is communicated with the water inlet end of the compressor 1 through a second water pipe 6; a first electromagnetic three - way valve 7 and a mixing valve 9 are respectively arranged on the first water pipe 5, the water inlet end of the hot water storage tank 3 is communicated with the first electromagnetic three - way valve 7, the water outlet end of the hot water storage tank 3 is communicated with the cold water tank 4 through a third water pipe, a second electromagnetic three - way valve 8 is arranged on the third water pipe, the second electromagnetic three - way valve 8 is communicated with the mixing valve 9 through a fourth water pipe, and the controller is respectively in communication connection with the compressor 1, the first electromagnetic three - way valve 7, and the second electromagnetic three - way valve 8; a computer program is stored in the controller, and when the controller executes the computer program, it realizes the control method of the air source heat pump system for combined heating in Embodiment I or Embodiment II.

[0082] In the specific content of the above specific embodiments, the technical features can be combined arbitrarily without contradiction. For the sake of brevity of description, not all possible combinations of the above technical features are described. However, as long as the combinations of these technical features do not exist in contradiction, they should all be considered as the scope recorded in this specification.

[0083] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A control method for a hybrid heating air source heat pump system, characterized in that: The following steps are involved: Start the air source heat pump system for hybrid heating and obtain the data of the outlet water temperature T1 and the target water temperature T2; According to the current temperature value detected, the operating frequency of the compressor under the current load is set so that the compressor operates at the maximum operating frequency under the current load. At this time, the air source heat pump system continuously heats the hot water storage tank while meeting the indoor heating demand; When the load continues to decrease and the temperature T3 of the hot water storage tank has not reached the set first threshold value N, the compressor continues to run and operates at the optimal operating frequency. At this time, the air source heat pump system continues to heat the hot water storage tank while meeting the indoor heating demand; When the temperature T3 of the hot water storage tank reaches the set first threshold N: If the load required by the user increases suddenly, the compressor is set to run at the maximum operating frequency under the current load, and the hot water storage tank is turned on at the same time. The compressor and the hot water storage tank are used for joint heating to make the environment heat up steadily and quickly to meet the customer's heating needs; If the user only needs to maintain the current temperature, turn off the compressor and use the hot water tank and cold water tank for mixed heating.

2. The control method of the air source heat pump system for hybrid heating according to claim 1, characterized in that: According to the peak and trough times of the mains electricity, and on the premise of meeting the indoor heating demand, the compressor is set to start during the trough time and shut down during the peak time; during the trough time, if the temperature value of the heat storage tank is less than or equal to the first threshold, the compressor operates stably at the optimal operating frequency and heats the heat storage tank at the same time; if not, the compressor is shut down.

3. The control method of the air source heat pump system for hybrid heating according to claim 1, characterized in that: When the temperature T3 of the hot water storage tank has not reached the first threshold value N, if the user's required load changes greatly, the compressor will first operate at the maximum operating frequency under the current load under high load. After the load demand is met, when it enters low load, the compressor will operate at the optimal operating frequency and heat the hot water storage tank at the same time.

4. The control method of the air source heat pump system for hybrid heating according to claim 2, characterized in that: For scenarios with high user demand load, if the temperature of the hot water storage tank reaches the first threshold, the compressor runs at the maximum operating frequency under the current load, and the hot water storage tank is turned on at the same time, and the hot water storage tank and the compressor are used to provide heat together; if the temperature of the hot water storage tank does not reach the first threshold, the compressor runs at the maximum operating frequency under the current load and heats the hot water storage tank at the same time; For scenarios with medium user demand load, if the temperature of the hot water storage tank reaches the first threshold, the compressor operates at the optimal operating frequency, and the hot water storage tank is turned on at the same time, and the hot water storage tank and the compressor are used to provide heat together; if the temperature of the hot water storage tank does not reach the first threshold, the compressor operates at the optimal operating frequency and heats the hot water storage tank at the same time; For scenarios with low user demand load, if the temperature of the hot water storage tank reaches the first threshold, the hot water storage tank and the cold water tank are turned on at the same time, and mixed heating of the hot water storage tank and the cold water tank is adopted; if the temperature of the hot water storage tank does not reach the first threshold, the compressor operates at the optimal operating frequency and heats the hot water storage tank at the same time.

5. The control method of the air source heat pump system for hybrid heating according to any one of claims 2 to 4, characterized in that: After the air source heat pump system is turned on, the compressor is operated at the maximum operating frequency under the current load of the compressor according to the outlet water temperature T1 and the target water temperature T2, so as to meet the indoor heating demand and continuously heat the water storage tank; Determine whether the difference between the target water temperature value T2 and the outlet water temperature value T1 is greater than or equal to the first set value X1: If so, when T3≥N, the compressor continues to operate at the maximum operating frequency of the compressor under the current load, and the hot water storage tank is turned on for mixed heating; when T3<N, the compressor continues to operate at the maximum operating frequency of the compressor under the current load, meeting the indoor heating demand while continuously heating the hot water storage tank; If not, determine whether the difference between the target water temperature value T2 and the outlet water temperature value T1 is greater than or equal to the second set value X2, X2 is less than X1, and whether the temperature T3 of the hot water storage tank reaches the first threshold value N: If T3≥N, and T2-T1<X2, the compressor is turned off and the hot water storage tank and the cold water tank are used for mixed heating; If T3 ≥ N, and X1 > T2 - T1 ≥ X2, the compressor operates at the optimal operating frequency, and the hot water storage tank is turned on for mixed heating; If T3<N, and X1>T2-T1≥X2, the compressor operates at the optimal operating frequency, meeting the indoor heating demand while continuously heating the water storage tank.

6. The control method of the hybrid heating air source heat pump system according to claim 5, characterized in that: The first threshold is 90°C to 100°C.

7. The control method of the air source heat pump system for hybrid heating according to claim 5, characterized in that: The optimal operating frequency is 55 Hz to 65 Hz; the maximum operating frequency is greater than the optimal operating frequency.

8. The control method of the air source heat pump system for hybrid heating according to claim 5, characterized in that: The first setting value is 10°C to 15°C, and the second setting value is 3°C to 7°C.

9. A hybrid heating air source heat pump system, characterized in that: It includes a controller, a compressor, a user-end water coil, a hot water storage tank and a cold water tank; the water outlet end of the compressor is connected to the water inlet end of the user-end water coil through a first water pipe, and the water outlet end of the user-end water coil is connected to the water inlet end of the compressor through a second water pipe; a first electromagnetic three-way valve and a mixing valve are respectively provided on the first water pipe, the water inlet end of the hot water storage tank is connected to the first electromagnetic three-way valve, the water outlet end of the hot water storage tank is connected to the cold water tank through a third water pipe, a second electromagnetic three-way valve is provided on the third water pipe, the second electromagnetic three-way valve is connected to the mixing valve through a fourth water pipe, and the controller is respectively communicated with the compressor, the first electromagnetic three-way valve, and the second electromagnetic three-way valve; a computer program is stored in the controller, and when the controller executes the computer program, the control method of the air source heat pump system with mixed heating according to any one of claims 1 to 8 is implemented.

10. The hybrid heating air source heat pump system according to claim 9, characterized in that: It also includes a temperature sensing probe, which is installed on the hot water storage tank, the user-end water pipe, and the water outlet of the compressor. The temperature sensing probe is communicatively connected with the controller.

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