Heat pump system heat recovery control method and device, heat pump system and storage medium

Abstract

The application discloses a heat pump system tail gas recovery control method and device, a heat pump system and a storage medium, relates to the technical field of tail gas recovery, and the heat pump system comprises a tail gas recovery valve, an air return mixing chamber, an evaporator, a four-way valve and a compressor which are connected in sequence, the evaporator is further connected with a throttling component and a water side heat exchanger in sequence, the compressor is further connected with the water side heat exchanger through the four-way valve, the tail gas recovery valve is used for receiving tail gas after boiler combustion and transmitting to the air return mixing chamber, the method comprises the following steps: acquiring the evaporator temperature and the water side heat exchanger outlet water temperature in response to the heating demand and when the boiler is started; and controlling the tail gas recovery valve according to the evaporator temperature and / or the water side heat exchanger outlet water temperature, so as to realize tail gas recovery. Through tail gas heat recovery, the heat pump evaporation heat absorption temperature can be improved at low temperature, and the heat pump output efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat recovery, in particular to a heat pump system heat recovery control method and device, a heat pump system and a storage medium. BACKGROUND

[0002] At present, the main form of urban resident heating in China is urban central heating, which mainly uses pure heat pump systems or hybrid systems for heating. The pure heat pump system can only use a larger outdoor heat exchanger to improve the heat absorption capacity to improve the low-temperature heating capacity, while the hybrid system can reduce the size of the heat exchanger by absorbing exhaust heat to reduce the weight and cost of the whole machine. However, the existing hybrid heat pump system only relies on the ambient temperature for heating, and the heating efficiency is low in low-temperature environment. SUMMARY

[0003] The main purpose of the present application is to provide a heat pump system heat recovery control method, device, system and storage medium, which aims to solve the technical problem of low heating efficiency of the heat pump system in low-temperature environment.

[0004] To achieve the above-mentioned purpose, the present application provides a heat pump system heat recovery control method, which is applied to a heat pump system. The heat pump system comprises: a tail gas recovery valve, a return air mixing chamber, an evaporator, a four-way valve and a compressor connected in sequence, wherein the evaporator is further connected with a throttling component and a water-side heat exchanger in sequence, and the compressor is further connected with the water-side heat exchanger through the four-way valve. The tail gas recovery valve is used to receive the exhaust gas after the boiler combustion and transmit it to the return air mixing chamber. The method comprises:

[0005] obtaining the evaporator temperature and the water-side heat exchanger outlet water temperature in response to the heating demand and when the boiler is turned on; and

[0006] controlling the tail gas recovery valve according to the evaporator temperature and / or the water-side heat exchanger outlet water temperature to realize heat recovery.

[0007] In an embodiment, the step of controlling the tail gas recovery valve according to the evaporator temperature and / or the water-side heat exchanger outlet water temperature to realize heat recovery comprises:

[0008] obtaining the evaporator inlet temperature and the evaporator return air temperature according to the evaporator temperature; and

[0009] controlling the tail gas recovery valve according to at least one of the evaporator inlet temperature, the evaporator return air temperature and the water-side heat exchanger outlet water temperature to realize heat recovery.

[0010] In an embodiment, the step of controlling the tail gas recovery valve according to at least one of the evaporator inlet temperature, the evaporator return air temperature and the heat exchanger outlet water temperature to achieve heat recovery comprises:

[0011] controlling the tail gas recovery valve to open when the heat exchanger outlet water temperature is less than a preset temperature difference and the evaporator return air temperature is less than or equal to a first preset temperature threshold; and

[0012] controlling the tail gas recovery valve to close to achieve heat recovery when the heat exchanger outlet water temperature is greater than a preset setting temperature.

[0013] In an embodiment, the step of controlling the tail gas recovery valve according to at least one of the evaporator inlet temperature, the evaporator return air temperature and the heat exchanger outlet water temperature to achieve heat recovery comprises:

[0014] controlling the tail gas recovery valve to open when the evaporator return air temperature is greater than a first preset temperature threshold and less than or equal to a second preset temperature threshold and the evaporator inlet temperature is less than a first preset inlet temperature value; and

[0015] decreasing the air speed of the tail gas recovery valve to a preset gear when the evaporator inlet temperature is greater than a second preset inlet temperature value, which is greater than the first preset inlet temperature value, and setting an opening period and an opening duration to control the tail gas recovery valve to achieve heat recovery.

[0016] In an embodiment, the step of controlling the tail gas recovery valve according to at least one of the evaporator inlet temperature, the evaporator return air temperature and the heat exchanger outlet water temperature to achieve heat recovery comprises:

[0017] setting an opening period and an opening duration when the evaporator return air temperature is greater than a first preset temperature threshold and less than or equal to a second preset temperature threshold, the evaporator inlet temperature is greater than or equal to a first preset inlet temperature value, and the heat exchanger outlet water temperature is greater than a second preset inlet temperature value; and

[0018] controlling the tail gas recovery valve according to the opening period and the opening duration, and controlling the tail gas recovery valve to close to achieve heat recovery when the heat exchanger outlet water temperature is greater than a preset setting temperature.

[0019] In an embodiment, the step of controlling the tail gas recovery valve according to at least one of the evaporator inlet temperature, the evaporator return air temperature and the heat exchanger outlet water temperature to achieve heat recovery comprises:

[0020] When the evaporator return air temperature is greater than a second preset temperature threshold, the tail gas recovery valve is controlled to be closed to realize heat recovery.

[0021] In an embodiment, the step of controlling the tail gas recovery valve according to the evaporator temperature and / or the water outlet temperature of the water-side heat exchanger to realize heat recovery comprises:

[0022] obtaining a continuous detection duration and a preset temperature difference; and

[0023] When the water outlet temperature of the water-side heat exchanger is greater than or equal to the preset temperature difference within the continuous detection duration, the tail gas recovery valve is controlled to be closed to realize heat recovery.

[0024] In addition, to achieve the above-mentioned purpose, the present application further provides a heat pump system heat recovery control device, which comprises:

[0025] an obtaining module, configured to obtain an evaporator temperature and a water outlet temperature of a water-side heat exchanger in response to a heating demand and when a boiler is turned on; and

[0026] a control module, configured to control a tail gas recovery valve according to the evaporator temperature and / or the water outlet temperature of the water-side heat exchanger to realize heat recovery.

[0027] In addition, to achieve the above-mentioned purpose, the present application further provides a heat pump system, which comprises: a tail gas recovery valve, a return air mixing chamber, an evaporator, a four-way valve and a compressor connected in sequence, the evaporator is further connected with a throttling component and a water-side heat exchanger in sequence, the compressor is further connected with the water-side heat exchanger through the four-way valve, the tail gas recovery valve is used for receiving tail gas after combustion of a boiler and transmitting to the return air mixing chamber, and the heat pump system performs steps of the heat pump system heat recovery control method as described above.

[0028] In addition, to achieve the above-mentioned purpose, the present application further provides a storage medium, which is a computer readable storage medium, and a computer program is stored on the storage medium, the computer program is executed by a processor to realize steps of the heat pump system heat recovery control method as described above.

[0029] In addition, to achieve the above-mentioned purpose, the present application further provides a computer program product, which comprises a computer program, and the computer program is executed by a processor to realize steps of the heat pump system heat recovery control method as described above.

[0030] The one or more technical solutions provided in the application, the heat pump system comprises: a tail gas recovery valve, an air return mixing chamber, an evaporator, a four-way valve and a compressor connected in sequence, the evaporator is further connected with a throttling component and a water side heat exchanger in sequence, the compressor is further connected with the water side heat exchanger through the four-way valve, the tail gas recovery valve is used for receiving tail gas after combustion of a boiler and transmitting to the air return mixing chamber, the method comprises: obtaining an evaporator temperature and a water side heat exchanger outlet water temperature in response to a heating demand and when the boiler is turned on; and controlling the tail gas recovery valve according to the evaporator temperature and / or the heat exchanger outlet water temperature to realize heat recovery, through tail gas heat recovery, the heat pump evaporation heat absorption temperature can be improved at low temperature, and the heat pump output efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] The drawings incorporated into the specification and forming a part thereof show embodiments consistent with the present application and, together with the specification, serve to explain the principles of the application.

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows, and obviously, other drawings can also be obtained by those skilled in the art without creative labor under the premise of these drawings.

[0033] Figure 1 A flowchart is provided for the heat pump system heat recovery control method embodiment one of the application;

[0034] Figure 2 A structural diagram is provided for the heat pump system of the application;

[0035] Figure 3 A flowchart is provided for the heat pump system heat recovery control method embodiment two of the application;

[0036] Figure 4 A brief flowchart is provided for the heat pump system heat recovery control method of the application embodiment two;

[0037] Figure 5 A module structure diagram is provided for the heat pump system heat recovery control device of the application embodiment;

[0038] Figure 6 A device structure diagram of a hardware running environment involved in the heat pump system heat recovery control method in the application embodiment is provided.

[0039] BRIEF DESCRIPTION OF DRAWINGS

[0040] Heat pump system 10, tail gas recovery valve 11, air return mixing chamber 12, evaporator 13, four-way valve 14, compressor 15, throttling component 16, water side heat exchanger 17;

[0041] Boiler 20.

[0042] The purposes, functional features and advantages of the present application will be further illustrated with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0043] It should be understood that the specific embodiments described herein are merely intended to explain the technical solutions of the present application, and are not intended to limit the present application.

[0044] In order to better understand the technical solutions of the present application, the following will be described in detail in combination with the drawings and specific embodiments.

[0045] The main solution of the embodiments of the present application is: obtaining the evaporator temperature and the water outlet temperature of the water side heat exchanger in response to the heating demand and when the boiler is turned on; and controlling the tail gas recovery valve according to the evaporator temperature and / or the water outlet temperature of the heat exchanger to realize heat recovery.

[0046] Since the prior art is in low-temperature heating, one is to improve the heat absorption capacity through a larger outdoor heat exchanger, but the weight and cost of the outdoor heat exchanger are larger, and the other is to heat through a hybrid system, to reduce the size of the heat exchanger by absorbing tail gas waste heat, thereby reducing the weight and cost of the whole machine, but the heating efficiency is low.

[0047] The present application provides a solution, when the boiler is turned on, whether the tail gas recovery valve meets the opening condition is determined according to the obtained temperature data, so as to control the opening or closing of the tail gas recovery valve, when the tail gas recovery valve is opened, the high-temperature combustion tail gas enters the evaporator return air side to mix with air to evaporate and absorb heat for the refrigerant in the evaporator, thereby improving the heat absorption capacity of the low-pressure side refrigerant, thereby greatly improving the efficiency of converting air energy into heat energy of the heat pump system, especially the heating efficiency can be doubled at low temperature.

[0048] It should be noted that the execution subject of the present embodiment can be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device capable of realizing the above functions, a heat pump system heat recovery control device, etc. The following will take the heat pump system heat recovery control device as an example to describe the present embodiment and each of the following embodiments.

[0049] Based on this, the present embodiment provides a heat pump system heat recovery control method, which is described in detail with reference to Figure 1 , Figure 1 is a flowchart of the first embodiment of the heat pump system heat recovery control method of the present application.

[0050] In the present embodiment, the heat pump system heat recovery control method is applied to a heat pump system 10, as shown inFigure 2 As shown, Figure 2 As shown in the structural diagram of the heat pump system, the heat pump system 10 comprises, in sequence, an exhaust gas recovery valve 11, an air return mixing chamber 12, an evaporator 13, a four-way valve 14, and a compressor 15. The evaporator 13 is further connected in sequence with a throttling component 16 and a water-side heat exchanger 17. The compressor 15 is further connected with the water-side heat exchanger 17 through the four-way valve 14. The exhaust gas recovery valve 11 is used to receive the exhaust gas after combustion of a boiler 20 and transmit the exhaust gas to the air return mixing chamber 12.

[0051] Wherein, TP is the exhaust gas temperature, Th is the air return temperature, T3 is the evaporator inlet temperature, T4 is the evaporator air return temperature, Tw in is the water inlet temperature of the heat exchanger, and TW out is the water outlet temperature of the heat exchanger. After the refrigerant is compressed by the compressor 15, high-temperature and high-pressure gaseous refrigerant is discharged. After passing through the four-way valve 14, the high-temperature and high-pressure gaseous refrigerant enters the water-side heat exchanger 17 and exchanges heat with the circulating water flowing therethrough. The refrigerant is condensed into high-pressure two-phase state. After throttling by the throttling component 16, the refrigerant becomes low-temperature and low-pressure liquid refrigerant and enters the evaporator 13 to evaporate and absorb heat, and becomes low-temperature gaseous refrigerant and enters the compressor 15 for recycling.

[0052] In a specific implementation, the throttling component 16 can be an electronic expansion valve, and can also be other throttling components. The water-side heat exchanger 17 can be a double-pipe heat exchanger or a plate heat exchanger.

[0053] In the embodiment, the heat pump system heat recovery control method comprises steps S10-S20:

[0054] Step S10: obtaining the evaporator temperature and the water outlet temperature of the water-side heat exchanger in response to the heating demand and when the boiler is turned on.

[0055] It should be noted that the heating demand can be sent by a user. When the user requests heating, a heating request is generated to the heat pump system heat recovery control device. The device can respond to the heating request and determine whether the start condition is met. The start condition can be the operation of the boiler and the like. When the start condition is met, the heat pump is controlled to start operation, and the boiler is turned on for combustion. The high-temperature exhaust gas generated by the boiler flows through the pipeline to the exhaust gas recovery valve.

[0056] When the boiler is turned on, the evaporator temperature and the water outlet temperature of the water-side heat exchanger can be obtained in real time. The evaporator temperature can include the evaporator inlet temperature and the evaporator outlet temperature.

[0057] Step S20: controlling the exhaust gas recovery valve according to the evaporator temperature and / or the water outlet temperature of the heat exchanger to realize heat recovery.

[0058] In a specific implementation, the tail gas recovery valve can be controlled by the evaporator temperature and the water outlet temperature of the water side heat exchanger collected in real time, and the tail gas recovery valve can also be controlled by one of the evaporator temperature and the water outlet temperature of the water side heat exchanger.

[0059] It can be understood that the tail gas recovery valve can be an electrically operated air valve, and the control of the tail gas recovery valve can include the control of the opening or closing state of the electrically operated air valve, and can also include the control of the gear, opening time or opening period of the electrically operated air valve.

[0060] It should be understood that by controlling the state or gear of the tail gas recovery valve, the tail gas recovery is realized at different temperatures, the function of improving the heat absorption capacity of the refrigerant on the low pressure side is realized, and the efficiency of converting air energy into heat energy of the heat pump system is greatly improved.

[0061] The embodiment provides a heat pump system heat gas recovery control method, which comprises the following steps: acquiring an evaporator temperature and a water outlet temperature of a water side heat exchanger in response to a heating demand and when a boiler is turned on; and controlling a tail gas recovery valve according to the evaporator temperature and / or the water outlet temperature of the heat exchanger to realize heat gas recovery. By controlling the tail gas valve, the heat recovery of tail gas is realized, the heat pump evaporation heat absorption temperature can be improved at low temperature, and the output efficiency of the heat pump is improved.

[0062] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as the above embodiment one can refer to the above introduction, and the subsequent will not be described in detail. On this basis, please refer to Figure 3 , step S20 comprises steps S201-S202:

[0063] Step S201: obtaining an evaporator inlet temperature and an evaporator return air temperature according to the evaporator temperature.

[0064] It should be noted that the evaporator temperature includes the inlet temperature of the evaporator and the return air temperature of the evaporator. The return air temperature of the evaporator refers to the return air temperature of the air after flowing through the evaporator, which is about to return to the indoor or use space. This temperature is an important parameter of the performance of the heat pump system, because it reflects the efficiency of heat absorption of the evaporator and the ability of the heat pump system to provide heat to the indoor, which can be measured by a temperature sensor arranged at the outlet of the evaporator.

[0065] The evaporator inlet temperature refers to the temperature of the air or refrigerant before entering the evaporator. The evaporator inlet temperature reflects the heat load of the air or refrigerant and the heat exchange efficiency of the system.

[0066] Step S202: controlling the tail gas recovery valve according to at least one of the evaporator inlet temperature, the evaporator return air temperature and the water outlet temperature of the heat exchanger to realize heat gas recovery.

[0067] In a specific implementation, when the evaporator inlet temperature, the evaporator return air temperature and the heat exchanger outlet water temperature are different, the opening and closing of the tail gas recovery valve can be intelligently controlled according to different temperature data to adjust the amount of boiler tail gas entering the evaporator.

[0068] The embodiment can obtain the evaporator inlet temperature and the evaporator return air temperature according to the evaporator temperature, control the tail gas recovery valve according to at least one of the evaporator inlet temperature, the evaporator return air temperature and the heat exchanger outlet water temperature to realize heat recovery, and automatically adjust the opening and closing of the tail gas recovery valve according to real-time monitored temperature parameters and a preset logic to optimize the operation efficiency and energy saving effect of the heat pump.

[0069] In a feasible implementation, step S202 can include steps A10-A20.

[0070] Step A10: when the heat exchanger outlet water temperature is less than a preset temperature difference value and the evaporator return air temperature is less than or equal to a first preset temperature threshold, control the tail gas recovery valve to open.

[0071] It should be noted that the first preset temperature threshold can be set according to requirements.

[0072] The relationship between the heat exchanger outlet water temperature and the preset temperature difference value is detected first to determine whether the tail gas recovery valve needs to be opened, and the preset temperature difference value is the stop temperature Tstop minus the back difference value.

[0073] A continuous detection duration can be set, for example, the continuous detection duration is 20 min, when the heat exchanger outlet water temperature is detected to be less than the preset temperature difference value within 20 min, the relationship between the evaporator return air temperature and the first preset temperature threshold is detected, when the evaporator return air temperature is less than or equal to the first preset temperature threshold, the evaporator inlet temperature does not need to be determined, and the tail gas recovery valve can be controlled to open as long as the boiler is opened, so that the tail gas waste heat is supplied to the heat pump return air mixing chamber through the tail gas recovery valve.

[0074] In a feasible implementation, the heat exchanger outlet water temperature can also be greater than the preset temperature difference value, therefore, the step of controlling the tail gas recovery valve according to the evaporator temperature and / or the heat exchanger outlet water temperature to realize heat recovery further includes: obtaining a continuous detection duration and a preset temperature difference value; and when the heat exchanger outlet water temperature is detected to be greater than or equal to the preset temperature difference value within the continuous detection duration, controlling the tail gas recovery valve to close to realize heat recovery.

[0075] It can be understood that the continuous detection duration can be set to 20 min, and if the heat exchanger outlet water temperature is greater than or equal to the preset temperature difference value within the continuous detection duration, the heat pump has already provided sufficient heat, and the tail gas recovery valve is controlled to be closed, and it is not necessary to transmit the high-temperature combustion tail gas to the return air mixing chamber.

[0076] Step A20: when the heat exchanger outlet water temperature is greater than the preset set temperature, the tail gas recovery valve is controlled to be closed to realize heat recovery.

[0077] In a specific implementation, after the tail gas recovery valve is opened, the heat exchanger outlet water temperature TWout is continuously detected, the preset set temperature can be set in advance, the preset set temperature can be Tset, and can also be the stop temperature Tstop-3. When the heat exchanger outlet water temperature TWout is greater than the preset set temperature, it is considered that the heat pump has already provided sufficient heat, or the indoor temperature has reached or exceeded the required temperature level, and additional heating is not necessary, and the tail gas recovery valve is controlled to be closed.

[0078] The embodiment controls the tail gas recovery valve to be opened when the heat exchanger outlet water temperature is less than the preset temperature difference value and the evaporator return air temperature is less than or equal to the first preset temperature threshold, and controls the tail gas recovery valve to be closed when the heat exchanger outlet water temperature is greater than the preset set temperature, to realize heat recovery, so that the heat pump system can more flexibly and efficiently cope with different heating demands, and fully utilize the boiler tail gas as a renewable heat source.

[0079] In a feasible implementation, step S202 can include steps B10-B20.

[0080] Step B10: when the evaporator return air temperature is greater than the first preset temperature threshold and less than or equal to the second preset temperature threshold, and the evaporator inlet temperature is less than the first preset inlet temperature value, the tail gas recovery valve is controlled to be opened.

[0081] It should be understood that when the evaporator return air temperature is greater than the first preset temperature threshold and less than or equal to the second preset temperature threshold, it can be detected whether the evaporator inlet temperature is less than the first preset inlet temperature value, the first preset inlet temperature value can be less than or equal to 20 degrees Celsius, and if the evaporator inlet temperature is less than the first preset inlet temperature value, the tail gas recovery valve is controlled to be opened to supplement the flue gas waste heat to the heat pump return air mixing chamber when the boiler is opened.

[0082] Step B20: when the evaporator inlet temperature is greater than the second preset inlet temperature value, the air speed of the tail gas recovery valve is reduced to a preset gear, and an opening period and an opening duration are set, and the tail gas recovery valve is controlled through the opening period and the opening duration to realize heat recovery, and the second preset inlet temperature value is greater than the first preset inlet temperature value.

[0083] It should be understood that during the opening of the tail gas recovery valve, the evaporator inlet temperature is also continuously detected. If the evaporator inlet temperature is greater than a second preset inlet temperature, which can be set to 30 degrees Celsius, when the evaporator inlet temperature is greater than 30 degrees Celsius, it is considered that the heat pump has provided sufficient heat, or the indoor temperature has reached or exceeded the required temperature level, at this time the air speed of the tail gas recovery valve can be reduced to a preset gear, which is the lowest air gear, and the opening period and opening duration can be set. The opening period can be every 10 minutes, and the opening duration can be set to 5 minutes. The tail gas recovery valve can be controlled to open for 5 minutes every 10 minutes to achieve periodic heat recovery. During the intermittent opening of the tail gas recovery valve, the heat exchanger outlet water temperature TWout is continuously detected. When the heat exchanger outlet water temperature TWout is greater than the preset setting temperature, the tail gas recovery valve is controlled to close.

[0084] In this embodiment, when the evaporator return air temperature is greater than a first preset temperature threshold and less than or equal to a second preset temperature threshold, and the evaporator inlet temperature is less than a first preset inlet temperature value, the tail gas recovery valve is controlled to open. When the evaporator inlet temperature is greater than a second preset inlet temperature value, the air speed of the tail gas recovery valve is reduced to a preset gear, and the opening period and opening duration are set. The tail gas recovery valve is controlled through the opening period and the opening duration to achieve heat recovery. The second preset inlet temperature value is greater than the first preset inlet temperature value. Through this control strategy, the opening and closing and air speed of the tail gas recovery valve can be adjusted according to the actual heat demand and temperature parameters, and the operating efficiency and energy saving effect of the heat pump can be optimized.

[0085] In a feasible implementation, step S202 can include steps C10-C20:

[0086] Step C10: When the evaporator return air temperature is greater than a first preset temperature threshold and less than or equal to a second preset temperature threshold, the evaporator inlet temperature is greater than or equal to a first preset inlet temperature value, and the heat exchanger outlet water temperature is greater than a second preset inlet temperature value, the opening period and opening duration are set.

[0087] It should be noted that when the evaporator return air temperature is greater than a first preset temperature threshold and less than or equal to a second preset temperature threshold, the evaporator inlet temperature and the heat exchanger outlet water temperature can be further determined. When the evaporator inlet temperature is greater than or equal to a first preset inlet temperature value and the heat exchanger outlet water temperature is greater than a second preset inlet temperature value, the intermittent opening of the tail gas recovery valve can be controlled when the boiler is opened. Therefore, the opening duration and opening period of the tail gas recovery valve can be set.

[0088] The second preset inlet temperature value is greater than the first preset inlet temperature value, for example, the first preset inlet temperature value can be set to be less than or equal to 20 degrees Celsius, and the second preset inlet temperature value can be set to be 30 degrees Celsius.

[0089] The opening period and the opening duration can be flexibly adjusted according to the temperature, for example, the opening duration is set to be 5 minutes, and the opening period is set to be opened once every 10 minutes, so as to realize periodic heat recovery.

[0090] Step C20: controlling the tail gas recovery valve through the opening period and the opening duration, and controlling the tail gas recovery valve to be closed when the outlet water temperature of the heat exchanger is greater than a preset setting temperature, so as to realize heat recovery.

[0091] In a specific implementation, the tail gas recovery valve can be controlled to be opened for 5 minutes every 10 minutes, and the evaporator inlet temperature and the outlet water temperature of the heat exchanger are detected continuously during the intermittent control of the tail gas recovery valve. If the evaporator inlet temperature is greater than the second preset inlet temperature value, the air speed of the tail gas recovery valve is reduced to the lowest air speed, and the tail gas recovery valve is intermittently controlled according to the opening period and the opening duration, until the outlet water temperature of the heat exchanger is greater than the preset setting temperature, and the tail gas recovery valve is controlled to be closed.

[0092] Further, the step of controlling the tail gas recovery valve according to at least one of the evaporator inlet temperature, the evaporator return air temperature and the outlet water temperature of the heat exchanger to realize heat recovery further comprises: controlling the tail gas recovery valve to be closed to realize heat recovery when the evaporator return air temperature is greater than a second preset temperature threshold.

[0093] It should be noted that when the evaporator return air temperature is greater than the second preset temperature threshold, it is proved that the evaporator return air temperature is high, and closing the tail gas recovery valve at this time helps to maintain the stable operation of the heat pump system and prevent system failure caused by too high temperature.

[0094] In a specific implementation, it can also be detected whether a fault shutdown or shutdown and the like is triggered during operation. If the fault shutdown or shutdown and the like is triggered, the tail gas recovery valve is controlled to be closed, and after the heat pump is started again, the control of the tail gas recovery valve is restarted according to the temperature.

[0095] For example, in order to help understand the implementation process of the heat pump system heat recovery control method obtained by combining the above-mentioned embodiment one, please refer to Figure 4 , Figure 4A brief flowchart of a heat pump system heat recovery control method is provided, specifically: when a heating request is received and the heat pump and the boiler meet the opening condition, the heat pump is controlled to start running, and the evaporator inlet temperature T3, the evaporator return air temperature T4, and the water outlet temperature TWout of the heat exchanger are continuously detected; when TWout is greater than or equal to Tstop-back difference value within the continuous detection time, the electric air valve is not opened; when TWout is less than Tstop-back difference value within the continuous detection time, it is detected whether the evaporator return air temperature T4 is less than or equal to the first preset temperature threshold; if T4 is less than or equal to the first preset temperature threshold, the value of T3 does not need to be determined, the electric air valve is opened to supply the heat pump return air mixing chamber with flue gas waste heat as long as the boiler is opened, and the electric air valve is controlled to be closed when TWout is greater than the preset setting temperature; if T4 is greater than the first preset temperature threshold and less than or equal to the second preset temperature threshold, and T3 is less than the first preset inlet temperature value, the electric air valve is opened to supply the heat pump return air mixing chamber with flue gas waste heat as long as the boiler is opened, and the electric air valve is controlled to be at the lowest wind speed when T3 is greater than the second preset inlet temperature value; if T4 is greater than the first preset temperature threshold and less than or equal to the second preset temperature threshold, T3 is greater than or equal to the first preset inlet temperature value, and TWout is greater than the second preset inlet temperature value (30 degrees Celsius), the electric air valve is controlled to be intermittently opened (recommended to be opened for 5 minutes every 10 minutes) to supply the heat pump return air mixing chamber with flue gas waste heat when the boiler is opened, and the electric air valve is controlled to be at the lowest wind speed when T3 is greater than the second preset inlet temperature value, and the electric air valve is controlled to be intermittently opened (recommended to be opened for 5 minutes every 10 minutes) until TWout is greater than the preset setting temperature, and the electric air valve is controlled to be closed; when T4 is greater than the second preset temperature threshold, the values of T3 and TWout do not need to be determined, and the electric air valve is controlled to be closed. In the running process, when a fault shutdown, shutdown and other situations are triggered, the electric air valve is controlled to be closed, and the judgment is re-performed after the heat pump is started.

[0096] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the heat pump system heat recovery control method of the present application. More forms of simple transformation based on this technical concept are within the protection scope of the present application.

[0097] The present application also provides a heat pump system heat recovery control device, please refer to Figure 5 , the heat pump system heat recovery control device comprises:

[0098] The acquisition module 10 is configured to acquire the evaporator temperature and the water outlet temperature of the water side heat exchanger in response to the heating demand and when the boiler is opened.

[0099] The control module 20 is configured to control the tail gas recovery valve according to the evaporator temperature and / or the heat exchanger outlet water temperature, so as to realize heat recovery.

[0100] The heat pump system heat recovery control device provided by the present application adopts the heat pump system heat recovery control method in the above embodiments, and can solve the technical problem of low heating efficiency of the heat pump system in a low temperature environment. Compared with the prior art, the heat pump system heat recovery control device provided by the present application has the same beneficial effects as the heat pump system heat recovery control method provided by the above embodiments, and other technical features in the heat pump system heat recovery control device are the same as the features disclosed in the above embodiments, which will not be repeated here.

[0101] In an embodiment, the control module 20 is further configured to obtain an evaporator inlet temperature and an evaporator return air temperature according to the evaporator temperature, and control the tail gas recovery valve according to at least one of the evaporator inlet temperature, the evaporator return air temperature and the heat exchanger outlet water temperature, so as to realize heat recovery.

[0102] In an embodiment, the control module 20 is further configured to control the tail gas recovery valve to open when the heat exchanger outlet water temperature is less than a preset temperature difference and the evaporator return air temperature is less than or equal to a first preset temperature threshold, and control the tail gas recovery valve to close when the heat exchanger outlet water temperature is greater than a preset setting temperature, so as to realize heat recovery.

[0103] In an embodiment, the control module 20 is further configured to control the tail gas recovery valve to open when the evaporator return air temperature is greater than a first preset temperature threshold and less than or equal to a second preset temperature threshold, and the evaporator inlet temperature is less than a first preset inlet temperature value, and control the tail gas recovery valve to reduce the air speed to a preset gear, set an opening period and an opening time length, and control the tail gas recovery valve through the opening period and the opening time length, so as to realize heat recovery, the second preset inlet temperature value being greater than the first preset inlet temperature value.

[0104] In an embodiment, the control module 20 is further configured to set an opening period and an opening time length when the evaporator return air temperature is greater than a first preset temperature threshold and less than or equal to a second preset temperature threshold, the evaporator inlet temperature is greater than or equal to a first preset inlet temperature value, and the heat exchanger outlet water temperature is greater than a second preset inlet temperature value, and control the tail gas recovery valve through the opening period and the opening time length, and control the tail gas recovery valve to close when the heat exchanger outlet water temperature is greater than a preset setting temperature, so as to realize heat recovery.

[0105] In an embodiment, the control module 20 is further configured to control the tail gas recovery valve to be closed to realize heat recovery when the evaporator return air temperature is greater than a second preset temperature threshold.

[0106] In an embodiment, the control module 20 is further configured to obtain a continuous detection duration and a preset temperature difference value, and control the tail gas recovery valve to be closed to realize heat recovery when the heat exchanger outlet water temperature is greater than or equal to the preset temperature difference value within the continuous detection duration.

[0107] The present application provides a heat pump system heat recovery control device, comprising: at least one processor; and a memory in communication connection with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the heat pump system heat recovery control method in the above-mentioned embodiment one.

[0108] Reference will now be made to the following description Figure 6 which illustrates a structure of a heat pump system heat recovery control device suitable for implementing the embodiments of the present application. The heat pump system heat recovery control device in the embodiments of the present application can include, but is not limited to, mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), and vehicle-mounted terminals (e.g., vehicle-mounted navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 6 The illustrated heat pump system heat recovery control device is merely an example and should not impose any limitation on the functions and use range of the embodiments of the present application.

[0109] As Figure 6As shown, the heat pump system heat recovery control device can include a processing device 1001 (e.g., a central processing unit, a graphics processing unit, etc.) that can perform various appropriate actions and processes according to programs stored in a read only memory (ROM) 1002 or programs loaded from a storage device 1003 into a random access memory (RAM) 1004. Various programs and data required for operation of the heat pump system heat recovery control device are also stored in the RAM 1004. The processing device 1001, the ROM 1002, and the RAM 1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; the storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the heat pump system heat recovery control device to communicate with other devices wirelessly or by wire to exchange data. Although the heat pump system heat recovery control device with various systems is shown in the figure, it should be understood that all the systems shown are not required to be implemented or possessed. More or fewer systems can be alternatively implemented or possessed.

[0110] In particular, the processes described above with reference to the flowcharts can be implemented as a computer software program according to embodiments of the present disclosure. For example, embodiments of the present disclosure include a computer program product comprising a computer program carried on a computer readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network through the communication device, or installed from the storage device 1003, or installed from the ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the methods of embodiments of the present disclosure are performed.

[0111] The heat pump system heat recovery control device provided by the present disclosure adopts the heat pump system heat recovery control method in the above-mentioned embodiments, and can solve the technical problem of low heating efficiency of the heat pump system in a low-temperature environment. Compared with the prior art, the heat pump system heat recovery control device provided by the present disclosure has the same beneficial effects as the heat pump system heat recovery control method provided by the above-mentioned embodiments, and other technical features in the heat pump system heat recovery control device are the same as the features disclosed in the previous embodiment method, which will not be repeated here.

[0112] It should be understood that various aspects of the disclosure can be implemented in hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any appropriate manner in any one or more embodiments or examples.

[0113] The above description is merely illustrative of the application and is not intended to limit the scope of the application. Any variations and modifications that can be made by any person skilled in the art within the spirit and scope of the application are intended to be encompassed by the application. The scope of the application is defined by the appended claims.

[0114] The application provides a computer readable storage medium having stored thereon computer readable program instructions (i.e., a computer program) for performing the heat pump system heat recovery control method in the above-described embodiments.

[0115] The computer readable storage medium provided by the application may, for example, be a U disk, but is not limited to an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, system, or device, or any combination thereof. More specific examples of the computer readable storage medium can include, but are not limited to, an electrical connection having one or more conductive wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any appropriate combination thereof. In the present embodiment, the computer readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer readable storage medium can be transmitted by any appropriate medium, including but not limited to an electrical wire, an optical cable, an RF (Radio Frequency), etc., or any appropriate combination thereof.

[0116] The above computer readable storage medium can be included in the heat pump system heat recovery control device; or can exist separately and not be assembled into the heat pump system heat recovery control device.

[0117] The computer readable storage medium described above carries one or more programs, when the one or more programs are executed by the heat pump system heat recovery control device, the heat pump system heat recovery control device: obtains the evaporator temperature and the water side heat exchanger outlet water temperature in response to the heating demand and when the boiler is turned on; and controls the tail gas recovery valve according to the evaporator temperature and / or the heat exchanger outlet water temperature to realize heat recovery.

[0118] Computer program code for carrying out operations of the present application can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider).

[0119] The flow diagrams and the block diagrams in the drawings are illustrations of architectures, functionalities, and operations of possible implementations of systems, methods, and computer program products according to various embodiments of the present application. In this regard, each block in the flow diagrams or block diagrams can represent a module, a segment, or a portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the blocks can occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently or the blocks may

[0120] The modules involved in the embodiments of the present application can be implemented in the manner of software or in the manner of hardware. Among them, the name of the module does not constitute a limitation to the unit itself in some cases.

[0121] The readable storage medium provided by the application is a computer readable storage medium, and the computer readable storage medium stores computer readable program instructions (namely, a computer program) for executing the heat pump system heat recovery control method described above, and can solve the technical problem of low heating efficiency of the heat pump system in a low temperature environment. Compared with the prior art, the computer readable storage medium provided by the application has the same beneficial effects as the heat pump system heat recovery control method provided by the above-mentioned embodiments, and will not be described here.

[0122] The application also provides a computer program product comprising a computer program, which, when executed by a processor, implements the steps of the heat pump system heat recovery control method as described above.

[0123] The computer program product provided by the application can solve the technical problem of low heating efficiency of the heat pump system in a low temperature environment. Compared with the prior art, the computer program product provided by the application has the same beneficial effects as the heat pump system heat recovery control method provided by the above-mentioned embodiments, and will not be described here.

[0124] The above-mentioned is only part of the embodiments of the application, and does not limit the patent scope of the application, and any equivalent structural transformation, direct / indirect application in other related technical fields made by using the content of the application specification and drawings under the technical concept of the application are included in the patent protection scope of the application.

Claims

1. A method for controlling heat recovery in a heat pump system, characterized in that, The heat pump system heat recovery control method is applied to a heat pump system, which includes: a tail gas recovery valve, a return air mixing chamber, an evaporator, a four-way valve, and a compressor connected in sequence. The evaporator is also connected in sequence to a throttling device and a water-side heat exchanger. The compressor is also connected to the water-side heat exchanger through the four-way valve. The tail gas recovery valve is used to receive tail gas after boiler combustion and transmit it to the return air mixing chamber. The method includes: In response to heating demand, the evaporator temperature and the water-side heat exchanger outlet water temperature are acquired when the boiler is turned on; and Controlling the exhaust gas recovery valve based on the evaporator temperature and / or the outlet water temperature of the water-side heat exchanger to achieve heat recovery includes: obtaining the evaporator inlet temperature and the evaporator return air temperature based on the evaporator temperature; and controlling the exhaust gas recovery valve based on at least one of the evaporator inlet temperature, the evaporator return air temperature, and the outlet water temperature of the water-side heat exchanger to achieve heat recovery. The step of controlling the exhaust gas recovery valve based on at least one of the evaporator inlet temperature, the evaporator return air temperature, and the water outlet temperature of the water-side heat exchanger to achieve heat recovery includes: When the outlet water temperature of the water-side heat exchanger is less than a preset temperature difference and the return air temperature of the evaporator is less than or equal to a first preset temperature threshold, the exhaust gas recovery valve is controlled to open; when the outlet water temperature of the water-side heat exchanger is greater than a preset temperature, the exhaust gas recovery valve is controlled to close, so as to realize heat recovery.

2. The method as described in claim 1, characterized in that, The step of controlling the exhaust gas recovery valve based on at least one of the evaporator inlet temperature, the evaporator return air temperature, and the water outlet temperature of the water-side heat exchanger to achieve heat recovery includes: When the evaporator return air temperature is greater than a first preset temperature threshold but less than or equal to a second preset temperature threshold, and the evaporator inlet temperature is less than the first preset inlet temperature value, the exhaust gas recovery valve is controlled to open; and When the evaporator inlet temperature is greater than the second preset inlet temperature value, the wind speed of the exhaust gas recovery valve is reduced to a preset level, and the opening cycle and opening duration are set. The exhaust gas recovery valve is controlled by the opening cycle and the opening duration to achieve heat recovery. The second preset inlet temperature value is greater than the first preset inlet temperature value.

3. The method as described in claim 1, characterized in that, The step of controlling the exhaust gas recovery valve based on at least one of the evaporator inlet temperature, the evaporator return air temperature, and the water outlet temperature of the water-side heat exchanger to achieve heat recovery includes: When the evaporator return air temperature is greater than a first preset temperature threshold but less than or equal to a second preset temperature threshold, the evaporator inlet temperature is greater than or equal to a first preset inlet temperature value, and the water-side heat exchanger outlet water temperature is greater than a second preset inlet temperature value, the opening cycle and opening duration are set; and The tail gas recovery valve is controlled by the opening cycle and the opening duration, and the tail gas recovery valve is closed when the outlet water temperature of the water-side heat exchanger is greater than the preset temperature, so as to realize heat recovery.

4. The method as described in claim 1, characterized in that, The step of controlling the exhaust gas recovery valve based on at least one of the evaporator inlet temperature, the evaporator return air temperature, and the water outlet temperature of the water-side heat exchanger to achieve heat recovery includes: When the evaporator return air temperature is greater than the second preset temperature threshold, the exhaust gas recovery valve is controlled to close to achieve heat recovery.

5. The method according to any one of claims 1 to 4, characterized in that, The step of controlling the tail gas recovery valve according to the evaporator temperature and / or the outlet water temperature of the water-side heat exchanger to achieve heat recovery includes: Obtain the continuous detection duration and preset temperature difference; and When the outlet water temperature of the water-side heat exchanger is detected to be greater than or equal to the preset temperature difference during the continuous detection period, the exhaust gas recovery valve is controlled to close to achieve heat recovery.

6. A heat pump system heat recovery control device, characterized in that, The heat pump system includes: a tail gas recovery valve, a return air mixing chamber, an evaporator, a four-way valve, and a compressor connected in sequence. The evaporator is also connected in sequence to a throttling device and a water-side heat exchanger. The compressor is also connected to the water-side heat exchanger through the four-way valve. The tail gas recovery valve is used to receive the tail gas after boiler combustion and transmit it to the return air mixing chamber. The device includes: The acquisition module is used to acquire the evaporator temperature and the water-side heat exchanger outlet water temperature in response to heating demand and when the boiler is turned on; and A control module is configured to control the exhaust gas recovery valve based on the evaporator temperature and / or the outlet water temperature of the water-side heat exchanger to achieve heat recovery, including: obtaining the evaporator inlet temperature and the evaporator return air temperature based on the evaporator temperature; and controlling the exhaust gas recovery valve based on at least one of the evaporator inlet temperature, the evaporator return air temperature, and the outlet water temperature of the water-side heat exchanger to achieve heat recovery. The control module is also used to control the tail gas recovery valve to open when the outlet water temperature of the water-side heat exchanger is less than a preset temperature difference and the return air temperature of the evaporator is less than or equal to a first preset temperature threshold; and to control the tail gas recovery valve to close when the outlet water temperature of the water-side heat exchanger is greater than a preset temperature, so as to realize heat recovery.

7. A heat pump system, characterized in that, The heat pump system includes: a tail gas recovery valve, a return air mixing chamber, an evaporator, a four-way valve, and a compressor connected in sequence. The evaporator is also connected in sequence to a throttling device and a water-side heat exchanger. The compressor is also connected to the water-side heat exchanger through the four-way valve. The tail gas recovery valve is used to receive the tail gas after boiler combustion and transmit it to the return air mixing chamber. The heat pump system performs the steps of the heat pump system heat gas recovery control method as described in any one of claims 1 to 5.

8. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the heat pump system heat recovery control method as described in any one of claims 1 to 5.

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