Method and system for improving heating efficiency of photoelectric combined heat pump

Abstract

The invention relates to the related technical field of heat pump heating control, in particular to a method and system for improving the heating efficiency of a photoelectric combined heat pump. And according to the first heat compensation circulation subsection and the first core index corresponding to the first dynamic time sequence interval and the second heat compensation circulation subsection and the second core index corresponding to the second dynamic time sequence interval, a heat compensation circulation switching mechanism is constructed, and switching optimization is conducted in combination with the heat exchange efficiency of the heat pump evaporator. The technical problem that when a photoelectric combined heat pump operates in a simple energy superposition mode and the illumination or energy storage state fluctuates, the collaboration of heat compensation and power supply is insufficient is solved, dynamic adaptation of energy distribution and working condition requirements is achieved, a heat compensation circulation switching mechanism is constructed, switching is optimized in combination with the heat exchange efficiency of the evaporator, switching disturbance is reduced, and the switching efficiency is improved. The system stability and the heating efficiency are both considered, and the photoelectric complementary collaboration and the overall heating efficiency are effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat pump heating control, and particularly relates to a method and system for improving the heating efficiency of a photoelectric combined heat pump. BACKGROUND

[0002] As an efficient and energy-saving heating device, a heat pump is widely used in building heating, industrial heating and other fields. The photoelectric combined heat pump technology can effectively reduce the dependence on traditional energy by combining photovoltaic power generation and heat pump heating.

[0003] Current photoelectric combined heat pump heating systems mostly use a simple energy superposition method. When the light is unstable or the energy storage state fluctuates, the problems of improper heat supplement timing and unreasonable energy distribution often occur, resulting in low solar energy utilization and poor electric energy conversion efficiency. Moreover, the heat supplement cycle switching under different working conditions is prone to disturbance, and it is difficult to balance the stability and heating efficiency of the system.

[0004] In summary, the existing technology has the technical problem that the photoelectric combined heat pump operates in a simple energy superposition mode, and the coordination between heat supplement and power supply is insufficient when the light or energy storage state fluctuates. SUMMARY

[0005] The present application provides a method and system for improving the heating efficiency of a photoelectric combined heat pump, which aims to solve the technical problem that the photoelectric combined heat pump in the prior art operates in a simple energy superposition mode, and the coordination between heat supplement and power supply is insufficient when the light or energy storage state fluctuates.

[0006] In view of the above problems, the technical solution of the present application is as follows: In a first aspect, the present application provides a method for improving the heating efficiency of a photoelectric combined heat pump, wherein the method comprises: obtaining the power generation of a solar power generation unit in a photovoltaic power generation unit and the remaining capacity of an energy storage unit; based on the power generation and the remaining capacity, combining the heat pump heating load demand, starting the energy storage unit to store electricity in a first dynamic time interval, and controlling the heat supplement by the light heat through the semiconductor refrigeration sheet and the condenser, while starting the energy storage unit to discharge electricity in a second dynamic time interval to obtain a combined power supply circuit; according to the first heat supplement cycle segment and the first core index corresponding to the first dynamic time interval, and the second heat supplement cycle segment and the second core index corresponding to the second dynamic time interval, a heat supplement cycle switching mechanism is constructed; based on the heat supplement cycle switching mechanism, the switching optimization is carried out in combination with the heat exchange efficiency of the heat pump evaporator.

[0007] Preferably, the heat pump evaporator is arranged in a heat collection water tank, the heat collection water tank is arranged outdoors to obtain the light heat, one end of the heat collection water tank is provided with a water storage tank, and the other end of the heat collection water tank is provided with a semiconductor refrigerating sheet, and the water storage tank is used for storing hot water; in the photoelectric combined heat pump, the heat collection water tank adopts a solar heat collection water tank, a photovoltaic power generation unit and a semiconductor refrigerating sheet for heating, and the photovoltaic power generation unit comprises a solar power generation unit and an energy storage unit.

[0008] Preferably, the switching judgment logic of the first dynamic timing interval is that: a light intensity threshold and an energy storage capacity threshold are set, when the power generation power of the solar power generation unit is greater than the heat pump heating load demand, the residual capacity of the energy storage unit is less than the energy storage capacity threshold, and the light intensity is greater than the light intensity threshold, the first dynamic timing interval is triggered.

[0009] Preferably, in the first dynamic timing interval, the heating end power of the semiconductor refrigerating sheet is dynamically adjusted according to the difference between the power generation power of the solar power generation unit and the heat pump heating load demand, the condenser returns to the heat collection water tank after the condensing return water temperature is raised through an expansion valve, and a first heat supplementing circulation section is formed.

[0010] Preferably, the switching judgment logic of the second dynamic timing interval is that: the power supply is dynamically allocated according to the proportion of the power generation power of the solar power generation unit and the energy storage discharge power, wherein the main power supply proportion is supplied to the heat pump compressor, and the auxiliary control power supply proportion is supplied to the semiconductor refrigerating sheet.

[0011] Preferably, in the second dynamic timing interval, based on the combined power supply circuit, the semiconductor refrigerating sheet is switched to a bidirectional heat exchange mode, the heating end of the semiconductor refrigerating sheet is attached to the outer wall of the water storage tank, a temperature difference strengthening area is formed between the heat pump evaporator in the heat collection water tank and the semiconductor refrigerating sheet, the compressor frequency and the semiconductor refrigerating sheet power supply duty cycle are dynamically adjusted according to the water temperature feedback of the water storage tank, and a second heat supplementing circulation section is formed.

[0012] Preferably, the first heat supplementing circulation section takes the solar energy utilization rate and the electric energy conversion efficiency as the first core indicators, and the second heat supplementing circulation section takes the heat storage heat preservation coefficient and the combined power supply energy efficiency ratio as the second core indicators.

[0013] Preferably, when switching from the first timing interval to the second timing interval and switching from the second timing interval to the first timing interval, a water temperature and light intensity two-dimensional fuzzy rule table of the heat collection water tank is used to configure a compensation control strategy under stable transition of heat conditions.

[0014] Preferably, when receiving the switching instruction, the compensation control strategy performs a disturbance-free smooth switching between a first heat compensation cycle segment corresponding to a first time sequence interval and a second heat compensation cycle segment corresponding to a second time sequence interval: according to the two-dimensional fuzzy rule table, combining the water temperature of the heat collection water tank, the light intensity change rate, the optimized semiconductor refrigeration piece power maintenance ratio output by fuzzy reasoning, and the condensing return water shunt adjustment coefficient, a transition period compensation control parameter is generated; in the initial stage of smooth switching, the compression machine frequency change slope is kept not more than a preset threshold, and at the same time, the power output of the semiconductor refrigeration piece is adjusted according to the transition period compensation control parameter.

[0015] In a second aspect, the application provides a system for improving the heating efficiency of a photovoltaic-thermal heat pump, wherein the system comprises: a data acquisition module configured to acquire the power generated by a solar power generation unit in a photovoltaic power generation unit and the remaining capacity of an energy storage unit; a combined power supply circuit obtaining module configured to start the energy storage unit to store electricity in a first dynamic time sequence interval based on the power generated and the remaining capacity, in combination with the heating load demand of the heat pump, to control the heat compensation of the light heat through the semiconductor refrigeration piece and the condenser, and to start the energy storage unit to discharge electricity in a second dynamic time sequence interval to obtain a combined power supply circuit; a heat compensation cycle switching mechanism construction module configured to construct a heat compensation cycle switching mechanism according to a first heat compensation cycle segment corresponding to the first dynamic time sequence interval and a first core index, and a second heat compensation cycle segment corresponding to the second dynamic time sequence interval and a second core index; and a switching optimization module configured to perform switching optimization based on the heat compensation cycle switching mechanism and in combination with the heat exchange efficiency of the heat pump evaporator.

[0016] In summary, the one or more technical solutions provided in the application achieve dynamic adaptation of energy distribution and working condition demand, construct a heat compensation cycle switching mechanism and optimize switching in combination with the heat exchange efficiency of the evaporator, reduce switching disturbance, take into account system stability and heating efficiency, and effectively improve the technical effects of photovoltaic complementary synergy and overall heating efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A flowchart of a method for improving the heating efficiency of a photovoltaic-thermal heat pump is provided for the application.

[0018] Figure 2 A structural diagram of a photovoltaic-thermal heat pump is provided for the application.

[0019] Figure 3 A structural diagram of a system for improving the heating efficiency of a photovoltaic-thermal heat pump is provided for the application.

[0020] Figure labeling: 1. Hot water tank; 2. Water storage tank; 3. Semiconductor cooling chip; 4. Solar power generation unit; 5. Energy storage unit; 6. Condenser; 7. Expansion valve; 8. Heat pump compressor; 9. Heat pump evaporator; 10. Water pump; M100. Data acquisition module; M200. Combined power supply circuit acquisition module; M300. Heat replenishment cycle switching mechanism construction module; M400. Switching optimization module. Detailed Implementation

[0021] Example 1: The present application will be described in detail below with reference to the accompanying drawings, as follows... Figure 1 As shown, this application provides a method for improving the heating efficiency of a photovoltaic combined heat pump, wherein the method includes: S1: Obtain the power generation of the solar power generation unit and the remaining capacity of the energy storage unit in the photovoltaic power generation unit; S2: Based on the power generation and remaining capacity, and combined with the heat pump heating load demand, start the energy storage unit to store electricity in the first dynamic time interval, and use the solar heat to supplement the heat control through the semiconductor cooling chip and condenser. At the same time, start the energy storage unit to discharge in the second dynamic time interval to obtain a combined power supply circuit.

[0022] Specifically, a photovoltaic power generation unit consists of a solar power generation unit and an energy storage unit. The solar power generation unit is responsible for converting solar energy into electrical energy, while the energy storage unit is used to store excess electrical energy for unforeseen needs. The heat pump heating load demand refers to the amount of heat the heat pump system needs to provide under specific conditions to meet the needs of building heating or industrial heating. The first dynamic time series interval and the second dynamic time series interval are time periods dynamically divided according to the system's operating status, used to control the charging and discharging operation of the energy storage unit, as well as the heat replenishment control. A semiconductor refrigeration chip is a device that uses the thermoelectric effect of semiconductor materials for cooling or heating. The condenser is a component of the heat pump system, responsible for cooling the high-temperature, high-pressure refrigerant gas into a liquid state while releasing heat.

[0023] Execution steps: The power generation of the solar power generation unit and the remaining capacity of the energy storage unit in the photovoltaic power generation unit are monitored in real time. In conjunction with the heating load demand of the heat pump system, further, within the first dynamic time interval, when the power generation of the solar power generation unit exceeds the heating load demand of the heat pump and the remaining capacity of the energy storage unit is lower than a set threshold, the energy storage unit starts to store electricity. At the same time, the solar heat is used for supplementary heating control through the semiconductor cooling chip and condenser. The heating end power of the semiconductor cooling chip is dynamically allocated according to the difference between the power generation and the heating load demand to ensure the effective utilization of energy.

[0024] Further, in the second dynamic timing interval, the energy storage unit discharges to form a joint power supply loop, ensuring that the electrical energy of the energy storage unit and the electrical energy of the solar power generation unit jointly power the heat pump system; in the above steps, by dynamically monitoring and controlling the charging and discharging of the energy storage unit, and using the heat supplement control of the semiconductor refrigerating fin and the condenser, the utilization rate of solar energy is improved, the conversion efficiency of electrical energy is optimized, the stability and heating efficiency of the system are ensured, specifically, when the light is sufficient, the system can fully utilize solar energy for energy storage and heat supplement, and when the light is insufficient, the energy storage unit can release electrical energy to ensure the continuous operation of the heat pump system, thereby effectively improving the photoelectric complementary synergy and overall heating efficiency, and realizing the dynamic adaptation of energy distribution and working condition demand.

[0025] S3: constructing a heat supplement cycle switching mechanism according to the first heat supplement cycle segment corresponding to the first dynamic timing interval and the first core index, and the second heat supplement cycle segment corresponding to the second dynamic timing interval and the second core index; S4: switching optimization based on the heat supplement cycle switching mechanism in combination with the heat exchange efficiency of the heat pump evaporator.

[0026] Specifically, the heat supplement cycle switching mechanism is a strategy for controlling the state transition of the heat pump system according to different dynamic timing intervals and corresponding heat supplement cycle segments, intelligently switching between different heat supplement modes according to preset indexes and conditions to ensure efficient operation of the system under different working conditions; the first heat supplement cycle segment and the second heat supplement cycle segment correspond to the heat supplement operation in the first dynamic timing interval and the second dynamic timing interval respectively, and each segment has its specific operating mode and optimization target. The first core index and the second core index are used to evaluate and optimize the performance of the first heat supplement cycle segment and the second heat supplement cycle segment, including solar energy utilization rate, electrical energy conversion efficiency, heat storage insulation coefficient, and joint power supply energy efficiency ratio, etc.; the heat exchange efficiency of the heat pump evaporator refers to the efficiency of the heat pump evaporator in transferring heat from a low-temperature heat source to a high-temperature heat source during operation.

[0027] Execution steps: in the first dynamic timing interval, the system runs in the first heat supplement cycle segment, with solar energy utilization rate and electrical energy conversion efficiency as the first core index, at this time, the system mainly utilizes the excess electrical energy of the solar power generation unit for energy storage, and supplements heat through the semiconductor refrigerating fin and the condenser; in the second dynamic timing interval, the system runs in the second heat supplement cycle segment, with the heat storage insulation coefficient and the joint power supply energy efficiency ratio as the second core index, at this time, the energy storage unit discharges to jointly power the heat pump system with the solar power generation unit, and further optimizes the heat supplement effect through the bidirectional heat exchange mode of the semiconductor refrigerating fin.

[0028] A heat supplement cycle switching mechanism is constructed. Specifically, the heat supplement cycle switching mechanism determines when to switch from one heat supplement cycle segment to another segment by monitoring the system operating state in real time, including power generation, energy storage capacity, and light intensity, and making a decision according to a preset logic judgment. For example, when the light intensity decreases and the remaining capacity of the energy storage unit reaches a certain threshold, the system switches from the first heat supplement cycle segment to the second heat supplement cycle segment.

[0029] The switching is optimized in combination with the heat exchange efficiency of the heat pump evaporator. Specifically, during the switching process, a two-dimensional fuzzy rule table of the water temperature of the heat collection tank and the light intensity is used to configure the heat conditions to ensure smooth transition. Through fuzzy reasoning, the power output of the semiconductor refrigeration sheet and the condensing return water shunt adjustment coefficient can be dynamically adjusted to optimize the heat exchange efficiency. For example, when the water temperature is high and the light intensity is low, the system may reduce the power output of the semiconductor refrigeration sheet to avoid excessive heat supplement.

[0030] In the above steps, by constructing the heat supplement cycle switching mechanism, the operating mode can be dynamically adjusted according to different working conditions to ensure efficient operation under different conditions. Furthermore, the switching is optimized in combination with the heat exchange efficiency of the heat pump evaporator to improve the stability and heating efficiency of the system. Specifically, when the light is sufficient, the system preferentially uses solar energy for energy storage and heat supplement to improve the solar energy utilization rate. When the light is insufficient, the energy storage unit is discharged to supply power together with the solar power generation unit to ensure the continuous operation of the heat pump system. This dynamic adaptation and optimization strategy effectively improves the photovoltaic complementary synergy and overall heating efficiency, reduces switching disturbance, and balances the stability and heating efficiency of the system.

[0031] Further, as shown in Figure 2 The method of the present application comprises: The heat pump evaporator is arranged in the heat collection tank, which is arranged outdoors to obtain the light heat. One end of the heat collection tank is provided with a water storage tank, and the other end of the heat collection tank is provided with a semiconductor refrigeration sheet. The water storage tank is used for storing hot water. In the photovoltaic combined heat pump, the heat collection tank uses a solar heat collection tank and a photovoltaic power generation unit plus a semiconductor refrigeration sheet for heating. The photovoltaic power generation unit includes a solar power generation unit and an energy storage unit.

[0032] Specifically, the heat pump evaporator is used to absorb heat from a low-temperature heat source and transfer it to a high-temperature heat source, and the heat pump evaporator is arranged in the heat collection water tank to improve the heating efficiency of the heat pump system; the heat collection water tank is a device for collecting and storing hot water, arranged outdoors, capable of receiving solar energy and converting it into heat energy, wherein one end of the heat collection water tank is provided with a water storage tank for storing hot water; the other end is provided with a semiconductor refrigeration sheet for heat supplement control; the water storage tank is a container for storing hot water, connected to the heat collection water tank to ensure stable supply of hot water; the semiconductor refrigeration sheet uses the thermoelectric effect of semiconductor materials to control heat supplement and improve the heating efficiency of the heat pump system; the solar heat collection water tank is usually installed outdoors and can convert solar energy into heat energy for heating water in the heat collection water tank; the photovoltaic power generation unit is composed of a solar power generation unit and an energy storage unit, the solar power generation unit is responsible for converting solar energy into electrical energy, and the energy storage unit is used to store excess electrical energy.

[0033] By arranging the heat pump evaporator in the heat collection water tank and using the solar heat collection water tank and photovoltaic power generation unit for heating, solar energy is efficiently utilized to improve heating efficiency. Furthermore, through the heat supplement control of the energy storage unit and the semiconductor refrigeration sheet, the stability and heating efficiency of the system are ensured. Specifically, when the light is sufficient, the system can fully utilize solar energy for heating and energy storage; when the light is insufficient, the energy storage unit can release electrical energy for heat supplement through the semiconductor refrigeration sheet to ensure the continuous operation of the heat pump system, effectively improving the photovoltaic complementary synergy and overall heating efficiency.

[0034] Further, the method of the present application comprises: The switching judgment logic of the first dynamic timing interval: set the light intensity threshold and the energy storage capacity threshold, when the power generation power of the solar power generation unit is greater than the heat pump heating load demand, and the remaining capacity of the energy storage unit is less than the energy storage capacity threshold, and the light intensity is greater than the light intensity threshold, trigger the first dynamic timing interval.

[0035] Specifically, the light intensity threshold is used to determine whether the current light condition meets the requirement of the system entering the first dynamic timing interval, when the actual light intensity exceeds the light intensity threshold, it is considered that the light condition is sufficient, and the corresponding operation can be performed; the energy storage capacity threshold refers to the preset remaining capacity value of the energy storage unit, which is used to determine whether the energy storage unit needs to be charged; when the remaining capacity of the energy storage unit is lower than the energy storage capacity threshold, it is considered that the energy storage unit can be charged.

[0036] By setting the light intensity threshold and the energy storage capacity threshold, and monitoring and judging in real time according to the thresholds, it can be judged when to enter the first dynamic timing interval, so as to ensure that when the light is sufficient and the energy storage unit needs to be charged, the excess power generated can be fully utilized for energy storage and heat supplement, thereby improving the operation efficiency and stability of the system. Specifically, when the light is sufficient and the remaining capacity of the energy storage unit is low, the solar energy is preferentially utilized for charging and heat supplement, thereby improving the utilization rate of solar energy. This dynamic adaptation strategy effectively improves the photoelectric complementary synergy and overall heating efficiency, thereby ensuring the efficient operation of the system.

[0037] Further, the method of the present application comprises: In the first dynamic timing interval, the power of the heating end of the semiconductor refrigeration sheet is dynamically adjusted according to the difference between the power generated by the solar power generation unit and the heating load demand of the heat pump, and the condenser is connected to the heat collection tank through an expansion valve to form a first heat supplement cycle section.

[0038] Specifically, dynamically adjusting the power of the heating end of the semiconductor refrigeration sheet means that the power of the heating end of the semiconductor refrigeration sheet is adjusted in real time according to the difference between the power generated by the solar power generation unit and the heating load demand of the heat pump, thereby ensuring the effective utilization of energy and avoiding energy waste. The condenser is connected to the heat collection tank through an expansion valve to form a first heat supplement cycle section. The condenser is responsible for cooling the high-temperature and high-pressure refrigerant gas into a liquid state while releasing heat. By adjusting the temperature of the condensing return water through the expansion valve, the temperature of the condensing return water can be increased, so that more heat can be provided when it flows back to the heat collection tank. The first heat supplement cycle section is the operation mode in the first dynamic timing interval, and through the synergistic effect of the semiconductor refrigeration sheet and the condenser, a high-efficiency heat supplement cycle is formed to improve the water temperature of the heat collection tank.

[0039] The condenser is connected to the heat collection tank through an expansion valve to form a first heat supplement cycle section. Specifically, the condenser cools the high-temperature and high-pressure refrigerant gas into a liquid state, and the released heat is absorbed by the condensing return water. By adjusting the flow and pressure of the condensing return water through the expansion valve, the temperature of the condensing return water is increased. The condensing return water with increased temperature is returned to the heat collection tank through a pipeline to further increase the water temperature of the heat collection tank. Through the synergistic effect of the heating end of the semiconductor refrigeration sheet and the condenser, a first heat supplement cycle section is formed. The heating end of the semiconductor refrigeration sheet directly converts excess electrical energy into heat energy, and the condenser further provides heat by increasing the temperature of the condensing return water. The two processes work together to ensure that the water temperature of the heat collection tank can be quickly increased to meet the heating demand of the heat pump system.

[0040] In the above steps, by dynamically allocating the heating end power of the semiconductor refrigeration sheet, the system can make full use of the excess solar power generation to supplement heat, avoiding energy waste, and at the same time, through the synergistic effect of the condenser and the expansion valve, the temperature of the condensing return water is further improved, and the heat supplement efficiency is improved. Specifically, when the light is sufficient, the system can use the excess power generation for the heating of the semiconductor refrigeration sheet, and at the same time, the condenser can improve the temperature of the condensing return water, so as to ensure that the water temperature of the heat collection water tank can be quickly improved to meet the heating demand of the heat pump system. Through dynamic adjustment and optimization strategy, the photoelectric complementary synergy and overall heating efficiency are effectively improved, and the efficient operation of the system is ensured.

[0041] Further, the method of the present application comprises: The switching judgment logic of the second dynamic time interval: dynamically allocate the power supply according to the ratio of the power generation of the solar power generation unit and the discharge power of the energy storage; wherein, the main power supply ratio is provided for the heat pump compressor, and the auxiliary control supply ratio is used to drive the semiconductor refrigeration sheet.

[0042] Specifically, the switching judgment logic of the second dynamic time interval is a logic for dynamically judging when to switch according to specific conditions and parameters when running in the second dynamic time interval; the ratio of the power generation of the solar power generation unit and the discharge power of the energy storage is used to dynamically allocate the power supply, so that the system can run efficiently under different working conditions; the main power supply ratio is the power supply ratio allocated to the heat pump compressor, so that the heat pump compressor has enough power to run; the auxiliary control supply ratio is the power supply ratio allocated to the semiconductor refrigeration sheet, which is used to drive the semiconductor refrigeration sheet to control the heat supplement.

[0043] Preferably, the main power supply ratio refers to the part of the power distribution in the joint power supply circuit that prioritizes the operation of the heat pump compressor, and its ratio is dynamically determined according to the total available power of the system, but not less than 70% of the total power supply, so as to ensure the continuous and stable operation of the compressor under variable working conditions and maintain the high efficiency of the main cycle of the heat pump; the auxiliary control supply ratio refers to the part of the power allocated to the semiconductor refrigeration sheet, which is used to drive the Peltier effect to realize local heating or refrigeration regulation, and its ratio is not more than 30% of the total power supply, and can be dynamically started, stopped or regulated according to the temperature of the heat collection water tank, environmental light and other parameters.

[0044] The switching judgment logic of the second dynamic time interval, specifically, dynamically adjusts the main power supply ratio and the auxiliary control supply ratio according to the real-time monitored power generation and energy storage discharge power; when the power generation or energy storage discharge power changes, the power supply distribution ratio is recalculated to ensure that the heat pump compressor and the semiconductor refrigeration sheet can obtain sufficient power to maintain the efficient operation of the system.

[0045] In the above steps, by dynamically allocating the power supply, the system can flexibly adjust the power supply ratio of the heat pump compressor and the semiconductor refrigeration sheet according to different working conditions, ensuring that the system can still operate efficiently when the light is insufficient or the energy storage state fluctuates. Specifically, when the light is insufficient, the energy storage unit discharges and works together with the solar power generation unit to provide power for the heat pump compressor and the semiconductor refrigeration sheet, ensuring the continuous operation of the heat pump system. Through the dynamic adaptation strategy, the photoelectric complementary cooperation and the overall heating efficiency are effectively improved, the dependence on traditional energy is reduced, and the stability and heating efficiency of the system are ensured.

[0046] Further, the method of the present application comprises: In the second dynamic timing interval, based on the joint power supply circuit, the semiconductor refrigeration sheet is switched to a bidirectional heat exchange mode, the heating end of the semiconductor refrigeration sheet is attached to the outer wall of the water storage tank, and a temperature difference strengthening area is formed with the heat pump evaporator in the hot water tank. The compressor frequency and the semiconductor refrigeration sheet power duty cycle are dynamically adjusted according to the water temperature feedback of the water storage tank to form a second heat supplementing cycle segment.

[0047] Specifically, the joint power supply circuit refers to a power supply system composed of a solar power generation unit and an energy storage unit, which ensures stable power supply for the heat pump system under different working conditions; the bidirectional heat exchange mode is a working mode of the semiconductor refrigeration sheet, which can simultaneously perform refrigeration and heating operations to improve energy utilization efficiency; the temperature difference strengthening area refers to the attachment of the heating end of the semiconductor refrigeration sheet to the outer wall of the water storage tank, forming an area with a large temperature difference to enhance heat transfer efficiency; the power duty cycle refers to the proportion of actual work time of the semiconductor refrigeration sheet in a unit time, and the power output of the semiconductor refrigeration sheet can be controlled by adjusting the duty cycle.

[0048] In the second dynamic timing interval, the joint power supply circuit is started, the solar power generation unit and the energy storage unit jointly provide power for the heat pump system, and the joint power supply mode ensures that the energy storage unit can release electric energy when the light is insufficient, maintaining the stable operation of the system; the semiconductor refrigeration sheet is switched to a bidirectional heat exchange mode, which utilizes the temperature difference between the hot end and the cold end of the semiconductor refrigeration sheet to further improve the heat transfer efficiency; the compressor frequency and the semiconductor refrigeration sheet power duty cycle are dynamically adjusted according to the water temperature feedback of the water storage tank. Specifically, when the water temperature of the water storage tank is low, the frequency of the compressor and the power duty cycle of the semiconductor refrigeration sheet are increased to improve the heating power; when the water temperature of the water storage tank is high, the frequency of the compressor and the power duty cycle of the semiconductor refrigeration sheet can be reduced to avoid excessive heating; through the above process, the second heat supplementing cycle segment is set, and in the second heat supplementing cycle segment, the bidirectional heat exchange mode of the semiconductor refrigeration sheet and the joint power supply circuit work cooperatively to ensure efficient heat supplementing when the light is insufficient, maintaining the water temperature of the hot water tank.

[0049] In the above steps, the stability and heating efficiency of the system are improved by switching the semiconductor refrigerating sheet to a bidirectional heat exchange mode and using a combined power supply circuit; by dynamically adjusting the compressor frequency and the semiconductor refrigerating sheet power supply duty cycle, the efficient operation of the system under different working conditions is ensured, specifically, when the light is insufficient, the energy storage unit discharges and works together with the solar power generation unit to provide power for the heat pump system, and the bidirectional heat exchange mode of the semiconductor refrigerating sheet further improves the heat supplement efficiency, ensures that the water temperature of the hot water tank can be quickly raised, and meets the heating demand of the heat pump system. Through dynamic adaptation and optimization strategy, the photoelectric complementary cooperation and overall heating efficiency are effectively improved, and the efficient operation of the system is ensured.

[0050] Further, the method of the application comprises: The first heat supplement cycle segment takes solar energy utilization rate and electric energy conversion efficiency as the first core index; and the second heat supplement cycle segment takes heat storage and heat preservation coefficient and combined power supply energy efficiency ratio as the second core index.

[0051] Specifically, the first core index refers to a key index for evaluating the performance of the system in the first heat supplement cycle segment, including solar energy utilization rate and electric energy conversion efficiency, reflecting the efficiency of the system in utilizing solar energy and converting electric energy into heat energy, wherein the solar energy utilization rate refers to the proportion of the actual utilization of solar energy to the total received solar energy, usually expressed in percentage; the electric energy conversion efficiency refers to the efficiency of the system in converting electric energy into heat energy, usually expressed in percentage; the second core index refers to a key index for evaluating the performance of the system in the second heat supplement cycle segment, including heat storage and heat preservation coefficient and combined power supply energy efficiency ratio, reflecting the efficiency of the system in storing heat and combined power supply, wherein the heat storage and heat preservation coefficient refers to the ability of the system to store heat, usually expressed as the inverse of heat loss rate, the higher the value, the better the heat preservation performance; the combined power supply energy efficiency ratio refers to the total efficiency in the combined power supply circuit, usually expressed as the ratio of output power to input power.

[0052] Further, based on the heat supplement cycle switching mechanism, the heat exchange efficiency of the heat pump evaporator is switched and optimized, and the method of the application comprises: When switching from the first time interval to the second time interval and from the second time interval to the first time interval, the water temperature of the hot water tank and the light intensity two-dimensional fuzzy rule table are used to configure the compensation control strategy under the condition of smooth transition of heat supply.

[0053] Specifically, the two-dimensional fuzzy rule table is a fuzzy logic-based control strategy, which formulates control rules by considering the water temperature of the heat collection tank and the light intensity as two main factors; the fuzzy rule table can handle the fuzziness of variables, enabling the system to make reasonable decisions under inaccurate conditions; the compensation control strategy is used to ensure smooth transition of the system state by taking compensation measures, and by adjusting system parameters to reduce disturbances during the switching process and ensure stable operation of the system.

[0054] The compensation control strategy under the condition of smooth transition of thermal conditions is configured, specifically, according to the results of fuzzy reasoning, the related parameters are adjusted to execute the compensation control strategy, specifically, the power output of the semiconductor refrigeration sheet is increased, the frequency of the compressor is adjusted, or the flow of the condensing return water is changed, thereby ensuring smooth transition of the thermal conditions during the switching of the time interval, and reducing disturbances during the switching process; in the above steps, by using the two-dimensional fuzzy rule table to configure the compensation control strategy, the operating parameters can be dynamically adjusted according to the current water temperature and light intensity during the switching of different time intervals, ensuring stable operation of the system; the fuzzy control strategy can handle the fuzziness of variables, enabling the system to make reasonable decisions under inaccurate conditions, specifically, when switching from the first time interval to the second time interval, if the water temperature is low and the light intensity is strong, the power output of the semiconductor refrigeration sheet is increased to quickly raise the water temperature, ensuring smooth transition; through dynamic adaptation and optimization strategy, the stability and heating efficiency of the photoelectric combined heat pump are effectively improved, ensuring efficient operation of the photoelectric combined heat pump.

[0055] Further, the method of the present application comprises: When the switching instruction is received, the compensation control strategy performs non-disturbance smooth switching between the first heat compensation cycle segment corresponding to the first time interval and the second heat compensation cycle segment corresponding to the second time interval: according to the two-dimensional fuzzy rule table, combining the water temperature of the heat collection tank, the light intensity change rate, the optimized semiconductor refrigeration sheet power maintenance ratio and the condensing return water shunt adjustment coefficient output by fuzzy reasoning, transition period compensation control parameters are generated; in the initial stage of smooth switching, the compressor frequency change slope is kept not more than a preset threshold, and at the same time, the power output of the semiconductor refrigeration sheet is adjusted according to the transition period compensation control parameters.

[0056] Specifically, the undisturbed smooth switching refers to ensuring that the system output has no obvious fluctuation or disturbance through the control strategy when switching from one operating state to another, and ensuring smooth transition of the system; the fuzzy reasoning refers to deriving the fuzzy set of the output according to the fuzzy rules and the input fuzzy set, thereby realizing intelligent control of the system; the semiconductor refrigeration piece power maintenance ratio specifically refers to setting a ratio to maintain the power output of the semiconductor refrigeration piece in order to keep the power output of the semiconductor refrigeration piece stable during the switching process; the condensing return water shunt adjustment coefficient is used to adjust the coefficient of the condensing return water flow, and by adjusting the coefficient, the distribution of the condensing return water can be controlled to optimize the thermodynamic conditions of the system; the transition period compensation control parameter refers to a set of compensation control parameters generated by the system during the switching process to ensure smooth transition, which is used to adjust key parameters of the system, such as the power output of the semiconductor refrigeration piece and the flow of the condensing return water.

[0057] On the basis of the compensation control strategy under the condition of smooth transition of thermodynamic conditions, undisturbed smooth switching between the first heat supplement cycle segment and the second heat supplement cycle segment is performed, which ensures smooth transition between different operating states, reduces thermodynamic fluctuation in the switching process, and improves the stability and heating efficiency of the photoelectric combined heat pump. Specifically, when switching from the first heat supplement cycle segment to the second heat supplement cycle segment, if the water temperature change rate is high and the light intensity change rate is low, the power output of the semiconductor refrigeration piece can be appropriately increased, and the flow of the condensing return water can be adjusted to ensure smooth transition. Through dynamic adaptation and optimization strategies, the stability and heating efficiency of the photoelectric combined heat pump are effectively improved, and efficient operation of the photoelectric combined heat pump is ensured.

[0058] In summary, the beneficial effects of the embodiments of the present application are: Due to the adoption of obtaining the power generation of the solar power generation unit in the photovoltaic power generation unit and the residual capacity of the energy storage unit; based on the power generation and the residual capacity, in combination with the heat pump heating load demand, the energy storage unit is started to store electricity in the first dynamic time interval, and the light heat is controlled through the semiconductor refrigeration piece and the condenser supplement heat, at the same time, the energy storage unit is started to discharge in the second dynamic time interval, to obtain a combined power supply circuit; according to the first heat supplement cycle segment corresponding to the first dynamic time interval and the first core index, the second heat supplement cycle segment corresponding to the second dynamic time interval and the second core index, a heat supplement cycle switching mechanism is constructed; based on the heat supplement cycle switching mechanism, in combination with the heat exchange efficiency of the heat pump evaporator, switching optimization is performed. The present application provides a method and system for improving the heating efficiency of the photoelectric combined heat pump. The dynamic adaptation of energy distribution and working condition demand is realized, the heat supplement cycle switching mechanism is constructed, and the switching is optimized in combination with the evaporator heat exchange efficiency, the switching disturbance is reduced, the system stability and heating efficiency are considered, and the technical effects of effectively improving the photoelectric complementary synergy and overall heating efficiency are achieved.

[0059] Embodiment two, based on the same inventive concept as the method for improving the heating efficiency of a combined photovoltaic and heat pump in the preceding embodiment, as Figure 3 As shown in the preceding embodiment, the present application provides a system for improving the heating efficiency of a combined photovoltaic and heat pump, wherein the system comprises: Data acquisition module M100: Acquire the power generation of the solar power generation unit in the photovoltaic power generation unit and the remaining capacity of the energy storage unit.

[0060] Combined power supply circuit obtaining module M200: Based on the power generation and the remaining capacity, in combination with the heat pump heating load demand, start the energy storage unit to store electricity in the first dynamic time interval, control the heat supply of the light heat through the semiconductor refrigeration sheet and the condenser, and at the same time, start the energy storage unit to discharge electricity in the second dynamic time interval to obtain the combined power supply circuit.

[0061] Supplemental heat cycle switching mechanism construction module M300: According to the first supplemental heat cycle segment corresponding to the first dynamic time interval and the first core index, the second supplemental heat cycle segment corresponding to the second dynamic time interval and the second core index, construct a supplemental heat cycle switching mechanism.

[0062] Switching optimization module M400: Based on the supplemental heat cycle switching mechanism, in combination with the heat exchange efficiency of the heat pump evaporator, perform switching optimization.

[0063] Further, the system for improving the heating efficiency of a combined photovoltaic and heat pump is used to perform the following method: The heat pump evaporator is arranged in a heat collection water tank, the heat collection water tank is arranged outdoors, the light heat is acquired, one end of the heat collection water tank is provided with a water storage tank, the other end of the heat collection water tank is provided with a semiconductor refrigeration sheet, and the water storage tank is used to store hot water; in the combined photovoltaic and heat pump, the heat collection water tank uses a solar heat collection water tank and a photovoltaic power generation unit plus a semiconductor refrigeration sheet to heat, and the photovoltaic power generation unit includes a solar power generation unit and an energy storage unit.

[0064] Further, the system for improving the heating efficiency of a combined photovoltaic and heat pump is used to perform the following method: The switching judgment logic of the first dynamic time interval: Set the light intensity threshold and the energy storage capacity threshold, when the power generation of the solar power generation unit is greater than the heat pump heating load demand, and the remaining capacity of the energy storage unit is less than the energy storage capacity threshold, and the light intensity is greater than the light intensity threshold, trigger the first dynamic time interval.

[0065] Further, the system for improving the heating efficiency of a combined photovoltaic and heat pump is used to perform the following method: In the first dynamic timing interval, the semiconductor refrigeration piece heating end power is dynamically adjusted according to the difference between the power generation of the solar power generation unit and the heating load demand of the heat pump; the condenser is returned to the heat collection water tank after the condensing return water temperature is raised by the expansion valve, forming a first heat supplementing cycle section.

[0066] Further, the system for improving the heating efficiency of the photoelectric combined heat pump is used to perform the following method: The switching judgment logic of the second dynamic timing interval: dynamically allocate the power supply according to the ratio of the power generation of the solar power generation unit and the energy storage discharge power, wherein the main power supply proportionally supplies the heat pump compressor, and the auxiliary control supply proportionally drives the semiconductor refrigeration piece.

[0067] Further, the system for improving the heating efficiency of the photoelectric combined heat pump is used to perform the following method: In the second dynamic timing interval, based on the combined power supply circuit, the semiconductor refrigeration piece is switched to a bidirectional heat exchange mode, the heating end of the semiconductor refrigeration piece is attached to the outer wall of the water storage tank, and the heat pump evaporator in the heat collection water tank forms a temperature difference strengthening area, and the compressor frequency and the semiconductor refrigeration piece power supply duty cycle are dynamically adjusted according to the water temperature feedback of the water storage tank, forming a second heat supplementing cycle section.

[0068] Further, the system for improving the heating efficiency of the photoelectric combined heat pump is used to perform the following method: The first heat supplementing cycle section takes solar utilization rate and electric energy conversion efficiency as the first core index; the second heat supplementing cycle section takes heat storage insulation coefficient and combined power supply energy efficiency ratio as the second core index.

[0069] Further, the switching optimization module M400 is used to perform the following method: When switching from the first timing interval to the second timing interval, and switching from the second timing interval to the first timing interval, the water temperature of the heat collection water tank and the light intensity are used to configure a compensation control strategy under the condition of smooth transition of heat conditions.

[0070] Further, the switching optimization module M400 is used to perform the following method: When receiving the switching instruction, the compensation control strategy performs non-disturbance smooth switching between the first heat supplementing cycle section corresponding to the first timing interval and the second heat supplementing cycle section corresponding to the second timing interval: according to the two-dimensional fuzzy rule table, combining the water temperature of the heat collection water tank and the light intensity change rate, the optimized semiconductor refrigeration piece power maintenance ratio and the condensing return water shunt adjustment coefficient are output by fuzzy inference, to generate transition period compensation control parameters; in the initial stage of smooth switching, the compressor frequency change slope is kept not more than a preset threshold, and at the same time, the power output of the semiconductor refrigeration piece is adjusted according to the transition period compensation control parameters.

[0071] In summary, any step can be stored as computer instructions or programs in an unrestricted computer memory and can be called and recognized by an unrestricted computer processor, and no further limitation is made here.

[0072] Further, the above technical solutions only embody the preferred technical solutions of the technical solutions of the embodiments of the present application, and some changes made by the skilled in the art to some parts thereof also embody the principles of the novel embodiments of the present application. Obviously, the skilled in the art can make various modifications and changes to the present application without departing from the scope of the present application.

Claims

1. A method for improving the heating efficiency of a combined photoelectric heat pump, characterized in that, The method comprises: Obtaining the power generation of the solar power generation unit in the photovoltaic power generation unit and the remaining capacity of the energy storage unit; Based on the power generation and the remaining capacity, combined with the heat pump heating load demand, starting the energy storage unit to store electricity in the first dynamic time interval, controlling the light heat through the semiconductor refrigeration sheet and the condenser heat supplement, and simultaneously starting the energy storage unit to discharge electricity in the second dynamic time interval to obtain a combined power supply loop; According to the first heat supplement cycle segment and the first core index corresponding to the first dynamic time interval, and the second heat supplement cycle segment and the second core index corresponding to the second dynamic time interval, a heat supplement cycle switching mechanism is constructed; Based on the heat supplement cycle switching mechanism, combined with the heat exchange efficiency of the heat pump evaporator, switching optimization is performed.

2. The method for improving the heating efficiency of a combined photoelectric and heat pump according to claim 1, characterized in that, The method comprises: The heat pump evaporator is arranged in a heat collection water tank, the heat collection water tank is arranged outdoors to obtain the light heat, one end of the heat collection water tank is provided with a water storage tank, and the other end of the heat collection water tank is provided with a semiconductor refrigeration sheet, and the water storage tank is used to store hot water; In the photoelectric combined heat pump, the heat collection water tank adopts a solar heat collection water tank and a photovoltaic power generation unit plus a semiconductor refrigeration sheet to generate heat, and the photovoltaic power generation unit comprises a solar power generation unit and an energy storage unit.

3. The method for improving the heating efficiency of a combined photoelectric and heat pump according to claim 2, characterized in that, The method comprises: The switching judgment logic of the first dynamic time interval: setting a light intensity threshold and an energy storage capacity threshold, when the power generation of the solar power generation unit is greater than the heat pump heating load demand, and the remaining capacity of the energy storage unit is less than the energy storage capacity threshold, and the light intensity is greater than the light intensity threshold, the first dynamic time interval is triggered.

4. The method for improving the heating efficiency of a combined photoelectric and heat pump according to claim 3, characterized in that, The method comprises: In the first dynamic time interval, the semiconductor refrigeration sheet heating end power is dynamically adjusted according to the difference between the power generation of the solar power generation unit and the heat pump heating load demand, the condenser returns to the heat collection water tank after the condensing return water temperature is raised by the expansion valve, and a first heat supplement cycle segment is formed.

5. The method for improving the heating efficiency of a combined photoelectric and heat pump according to claim 2, characterized in that, The method comprises: The switching judgment logic of the second dynamic time interval: dynamically allocating the power supply according to the proportion of the power generation of the solar power generation unit and the energy storage discharge power, wherein the main power supply proportion is supplied to the heat pump compressor, and the auxiliary control supply proportion is used to drive the semiconductor refrigeration sheet.

6. The method for improving the heating efficiency of a combined photoelectric and heat pump according to claim 5, characterized in that, The method comprises: In the second dynamic time interval, based on the combined power supply loop, the semiconductor refrigeration sheet is switched to a bidirectional heat exchange mode, the heating end of the semiconductor refrigeration sheet is attached to the outer wall of the water storage tank, and a temperature difference strengthening area is formed between the heat pump evaporator in the heat collection water tank, the compressor frequency and the semiconductor refrigeration sheet power duty cycle are dynamically adjusted according to the water temperature feedback of the water storage tank, and a second heat supplement cycle segment is formed.

7. The method for improving the heating efficiency of a combined photoelectric and heat pump according to claim 1, wherein, The method comprises: The first heat supplement cycle segment takes the solar utilization rate and the electric energy conversion efficiency as the first core index; The second heat supplement cycle segment takes the heat storage insulation coefficient and the combined power supply energy efficiency ratio as the second core index.

8. The method for improving the heating efficiency of a combined photoelectric and heat pump according to claim 7, characterized in that, Based on the heat supplement cycle switching mechanism, combined with the heat exchange efficiency of the heat pump evaporator, switching optimization is performed, and the method comprises: When switching from the first time interval to the second time interval, and switching from the second time interval to the first time interval, a water temperature of the heat collection tank and light intensity two-dimensional fuzzy rule table is used to configure a compensation control strategy under smooth transition of heat conditions.

9. The method for improving the heating efficiency of a combined photoelectric and heat pump according to claim 8, characterized in that, The method comprises: When receiving a switching instruction, the compensation control strategy performs undisturbed smooth switching between a first heat supplement cycle segment corresponding to the first time interval and a second heat supplement cycle segment corresponding to the second time interval: according to the two-dimensional fuzzy rule table, combining the water temperature of the heat collection tank and the light intensity change rate, the optimized semiconductor refrigeration piece power maintenance ratio and the condensate return water shunt adjustment coefficient are output through fuzzy reasoning, to generate a transition period compensation control parameter; In the initial stage of smooth switching, the compressor frequency change slope is kept not more than a preset threshold, and at the same time, the power output of the semiconductor refrigeration piece is adjusted according to the transition period compensation control parameter.

10. A system for improving the heating efficiency of a combined photoelectric heat pump, characterized by, A step for implementing the method for improving the heating efficiency of a photoelectric combined heat pump according to any one of claims 1-9, the system comprising: A data acquisition module: acquiring the power generation of the solar power generation unit in the photovoltaic power generation unit and the remaining capacity of the energy storage unit; A combined power supply circuit obtaining module: based on the power generation and the remaining capacity, combining the heat pump heating load demand, starting the energy storage unit to store electricity in the first dynamic time interval, and at the same time, starting the energy storage unit to discharge electricity in the second dynamic time interval to obtain a combined power supply circuit; A heat supplement cycle switching mechanism construction module: according to the first heat supplement cycle segment corresponding to the first dynamic time interval and the first core index, and the second heat supplement cycle segment corresponding to the second dynamic time interval and the second core index, a heat supplement cycle switching mechanism is constructed; A switching optimization module: based on the heat supplement cycle switching mechanism, combining the heat exchange efficiency of the heat pump evaporator to perform switching optimization.

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