Anti-freezing solar photovoltaic photo-thermal heat collector and ground source heat pump industrial heat supply system

Abstract

The invention relates to the technical field of efficient utilization of solar energy and industrial clean heat supply, in particular to an anti-freezing solar photovoltaic photo-thermal collector and a ground source heat pump industrial heat supply system, the anti-freezing solar photovoltaic photo-thermal collector comprises a cooling pipe and a heat exchange piece, and the heat exchange piece comprises a PV plate, fins outside the pipe, a swirler and fins inside the pipe. The anti-freezing solar photovoltaic photo-thermal heat collector module with an optimized structure is combined with the ground source heat pump system, the heat transfer efficiency and the anti-freezing performance are improved through the design of the fins outside the pipe, the fins inside the pipe and the swirler, and gradient utilization of solar energy and underground heat energy is achieved through the intraday and cross-season multi-time heat storage technology. And meanwhile, all heat supply cycles are intelligently switched under different seasons and load conditions, so that the industrial heat supply energy consumption and the operation cost are effectively reduced, and the purposes of peak load shifting and clean low-carbon heat supply of the power grid are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of efficient utilization of solar energy and clean industrial heating, and particularly relates to a freeze-proof solar photovoltaic-thermal collector and an industrial heating system of a ground source heat pump. BACKGROUND

[0002] As an important part of traditional energy consumption and carbon emission, the efficient and low-carbon reconstruction of the industrial heating field is one of the important ways to achieve the goal. However, the traditional industrial heating mode is generally low in energy efficiency and serious in energy waste, and especially the heating mode mainly using fossil energy has a significant negative impact on the environment. Therefore, exploring a new clean and efficient heating system has become an important issue to be solved in the industrial heating field.

[0003] The ground source heat pump utilizes the stable temperature of the shallow underground soil to realize efficient heat energy conversion, and is a low-cost and environmentally friendly heating technology, but its performance is limited by the soil temperature under high peak load conditions, and there is a serious problem of soil heat imbalance in the industrial whole-year heating scenario, which further leads to the deterioration of the heat pump COP year by year. The solar photovoltaic-thermal collector (PV / T) can meet the heat energy demand while providing power, improving the power generation efficiency and the comprehensive utilization efficiency of solar energy, but due to the intermittency and volatility of solar energy, the PV / T is difficult to provide continuous and stable heat energy supply.

[0004] In addition, the heat exchange structure design of the existing photovoltaic-thermal collector also has inherent defects. In the traditional collector design, the cooling fluid is mostly in a laminar state in the pipe, resulting in a low flow rate of the fluid near the pipe wall, forming a stable boundary layer with a large thermal resistance. This boundary layer not only seriously hinders the efficient transfer of heat generated by the photovoltaic panel to the fluid, limiting the overall thermal efficiency of the system, but also in the winter low-temperature environment, this low-speed fluid layer is the first to reach the freezing point and freeze, which directly threatens the safe operation of the system. At present, the industry generally uses the methods of adding antifreeze or thickening the external insulation to cope with it, but these two methods respectively bring new problems such as high operating cost, environmental unfriendliness, or system bulkiness, installation inconvenience, etc. Therefore, the industry urgently needs an innovative design that can fundamentally optimize the internal fluid dynamics of the heat exchanger and simultaneously solve the problems of low heat transfer efficiency and endogenous freezing risk by strengthening internal turbulence.

[0005] At the same time, in cold regions, in order to prevent the cooling medium from freezing, antifreeze is selected as the cooling medium or the insulation layer is thickened, which increases the investment and self-weight of the PV / T, and brings adverse effects on its popularization and application. In addition, it is urgent to tap the peak shaving potential of the user side to build a new power system in order to improve the stability of the power grid, especially during the period of power supply shortage. SUMMARY

[0006] In view of the problems in the prior art, the present application is proposed.

[0007] Therefore, the present application aims to provide a system that can not only prevent the solar photovoltaic-thermal collector assembly from icing in a low-temperature environment, but also optimize the combined use of solar energy and geothermal energy through multi-period heat storage, so as to achieve efficient, clean and low-carbon operation of industrial heating throughout the year.

[0008] To solve the above technical problems, the present application provides the following technical solutions: A frost-proof solar photovoltaic-thermal collector, comprising a cooling pipe, a heat exchange component including a PV panel, an outer pipe rib, a cyclone device and an inner pipe rib, the PV panel is connected to the cooling pipe at the central axis, the outer pipe rib is symmetrically arranged on both sides of the cooling pipe, the length of the outer pipe rib along the axial direction of the cooling pipe is equal to the sum of the axial length of the cooling pipe and the axial length of the cyclone device, and the two ends of the outer pipe rib are connected to the PV panel and the cooling pipe respectively, the cyclone device is arranged in the cooling pipe, and the inner pipe rib is fixedly connected to the inner wall of the cooling pipe.

[0009] As a preferred scheme of the frost-proof solar photovoltaic-thermal collector, the cross section of the outer pipe rib and the PV panel perpendicular to the cooling water flow direction is similar to the upper half of an inverted triangular shape, the top edge outer wall is tightly welded to the back plate of the PV panel, the middle part of the top edge inner wall of the PV panel is tightly welded to the top of the cooling pipe, and the two bottom parts of the two inclined edges are welded to the two outer sides of the cooling pipe.

[0010] As a preferred scheme of the frost-proof solar photovoltaic-thermal collector, the cross section of the inner pipe rib perpendicular to the cooling water flow direction is type II, the inner pipe rib is integrally formed with the cooling pipe by rolling process, and the type II inner pipe rib is centered on and adjacent to the welding seam between the top of the cooling pipe and the top edge of the outer pipe rib.

[0011] As a preferred scheme of the frost-proof solar photovoltaic-thermal collector, the back part of the PV panel is coated with thermal insulation material, and the space surrounded by the inner pipe rib, the back plate of the PV panel and the cooling pipe is not coated with thermal insulation material, forming a radiation heat exchange space.

[0012] The frost-proof solar photovoltaic-thermal collector provided by the present application cooperates with the outer pipe rib, the inner pipe rib and the cyclone device to increase the heat exchange area and induce strong turbulence in the cooling pipe, thereby strengthening the heat transfer efficiency from the PV panel to the cooling medium, and simultaneously improving the light-heat conversion efficiency and the photoelectric conversion efficiency of the device; at the same time, the forced turbulence effectively destroys the low-speed fluid boundary layer near the wall in the pipe, fundamentally eliminating the risk of cooling medium being static and frozen in a low-temperature environment. This scheme solves the key technical problems of low heat transfer efficiency and poor frost protection performance of the existing PV / T collector without relying on chemical antifreeze.

[0013] The application also provides a ground source heat pump industrial heating system, comprising a freeze-proof solar photovoltaic-thermal collector, further comprising a solar photovoltaic-thermal collector subsystem, a ground source heat pump subsystem and a multi-time heat storage subsystem, the solar photovoltaic-thermal collector subsystem and the ground source heat pump subsystem are connected, and the ground source heat pump subsystem and the multi-time heat storage subsystem are connected.

[0014] As a preferred scheme of the ground source heat pump industrial heating system, the solar photovoltaic-thermal collector subsystem comprises a heat collection water tank, a solar heat collection pump, a first control shunt valve and a first three-way valve, the freeze-proof solar photovoltaic-thermal collector is sequentially connected with the solar heat collection pump and the heat collection water tank, the first control shunt valve is arranged between the heat collection water tank and a main circulating pipeline, and the first three-way valve is located at a water outlet end of the freeze-proof solar photovoltaic-thermal collector.

[0015] As a preferred scheme of the ground source heat pump industrial heating system, the ground source heat pump subsystem comprises a buried pipe, a heat supplement device, a heat pump, a ground source side circulating pump, a second three-way valve, a second control shunt valve, a third control shunt valve and a fourth control shunt valve, the buried pipe is connected with the heat pump, the second three-way valve is arranged between the buried pipe and the heat pump, and the second control shunt valve, the third control shunt valve, the fourth control shunt valve and the ground source side circulating pump are arranged on branch pipes of the buried pipe leading to the heat pump and the heat collection water tank, respectively.

[0016] As a preferred scheme of the ground source heat pump industrial heating system, the multi-time heat storage subsystem comprises a heat storage water tank, a heat load end, a heat storage circulating pump, a load side circulating pump, a fifth control shunt valve and a sixth control shunt valve, the heat storage water tank is connected with a condenser side of the heat pump and is connected in parallel with the heat load end, the heat storage circulating pump is arranged between the heat storage water tank and the heat pump, the fifth control shunt valve is arranged between the heat storage water tank and the heat storage circulating pump, and the sixth control shunt valve is arranged on a pipeline of the heat storage water tank and the heat pump leading to the heat load end.

[0017] As a preferred scheme of the ground source heat pump industrial heating system, further comprising a power grid, a storage battery and office electricity.

[0018] The power grid is connected with a plant microgrid, and is used for providing electric energy for the system and valley electricity for the storage battery.

[0019] The storage battery is used for storing valley electricity from the power grid, and releasing electric quantity to system electrical equipment or the office electricity during a price peak and a peak period.

[0020] The office electricity is used as an electricity load to consume the surplus power generated by the anti-freezing solar photovoltaic and photo-thermal collector or the power released by the battery.

[0021] As a preferred solution of the ground source heat pump industrial heating system, the heat storage water tank is used as an intra-day short-time heat storage device, and the ground buried pipe is used as a cross-season heat storage device.

[0022] The application has the following advantages: the application increases the heat exchange area by arranging the inner and outer ribs in and outside the cooling pipe; the application also arranges the cyclone at the end of the cooling pipe to force the fluid in the pipe to form turbulent flow, which destroys the stable boundary layer that seriously affects the heat exchange in the traditional laminar flow, greatly improves the heat transfer efficiency, and fundamentally eliminates the risk of freezing of the fluid near the pipe wall due to flow stagnation, realizing physical anti-freezing without additional cost and chemical agents; the system of the application combines the heat storage water tank as an intra-day short-time heat storage device with the ground buried pipe as a cross-season heat storage device, stores the surplus solar heat in summer in the ground to supplement the heat extracted from the soil in winter, thereby maintaining the annual balance of soil temperature and ensuring the long-term stable and efficient operation of the ground source heat pump system, overcoming the performance degradation problem of the traditional ground source heat pump in the whole-year continuous heating scenario. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0024] Figure 1 Structure diagram of the anti-freezing solar photovoltaic and photo-thermal collector.

[0025] Figure 2 Sectional view of the anti-freezing solar photovoltaic and photo-thermal collector.

[0026] Figure 3 Process diagram of the ground source heat pump system. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the application more obvious and easy to understand, the specific embodiments of the application will be described in detail below with reference to the drawings of the specification.

[0028] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details set forth in this description. In other instances, well-known methods, procedures, components, and circuits have not been described in detail so as not to unnecessarily obscure aspects of the present application.

[0029] It is also noted that, as used herein, "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the application. The appearances of the phrase "in one embodiment" or "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

[0030] Embodiment 1, Reference Figure 1 and Figure 2 The first embodiment of the present application provides a freeze-proof solar photovoltaic and photo-thermal collector, which comprises a cooling pipe 1 and a heat exchange component 2. Specifically, the heat exchange component 2 comprises a PV panel 23, a pipe-outer fin 24, a cyclone 25, and a pipe-inner fin 26. The PV panel 23 is connected to the cooling pipe 1 at the central axis of the PV panel 23. The pipe-outer fin 24 is symmetrically arranged on both sides of the cooling pipe 1. The length of the pipe-outer fin 24 along the axial direction of the cooling pipe 1 is equal to the sum of the axial length of the cooling pipe 1 and the axial length of the cyclone 25. The two ends of the pipe-outer fin 24 are connected to the PV panel 23 and the cooling pipe 1, respectively. The cyclone 25 is arranged at the end of the cooling pipe 1. The pipe-inner fin 26 is fixedly connected to the inner wall of the cooling pipe 1.

[0031] The heat exchange component 2 is used to ensure efficient heat transfer between the PV panel 23 and the cooling pipe 1, and to effectively prevent the freezing of the cooling liquid in a low-temperature environment by introducing fluid disturbance through the cyclone 25.

[0032] It is worth noting that the outer diameter of the cooling pipe 1 is the maximum circular diameter of the radial section of the cooling pipe 1, and the cooling pipe 1 is partially attached to the thermal insulation material 27. The inner diameter of the cooling pipe 1 is the minimum circular diameter of the radial section of the cooling pipe 1, which is the part contacted by the fluid inside the pipe. The outer diameter of the cyclone 25 is the same as the outer diameter of the cooling pipe 1, and the inner diameter of the cyclone 25 is the same as the inner diameter of the cooling pipe 1. The outer shell of the cooling pipe 1 and the cyclone 25 is made of copper, and the cyclone 25 is concentrically connected to the cooling pipe 1 and then welded and sealed.

[0033] One cooling pipe 1 is connected to another cooling pipe 1 through the cyclone 25.

[0034] In another embodiment, the cooling pipe 1 is directly connected to the end of the cooling pipe 1.

[0035] The cyclone 25 comprises an outer shell, a blade and a central shaft, the blade and the central shaft are made of stainless steel, the blade is welded to the inner wall of the central shaft and the outer shell at both ends respectively, the blade has a large windward angle and a large curvature, and the windward surface of the blade is densely covered with small pits.

[0036] The large windward angle and curvature design helps to form stronger fluid disturbance and turbulence in the cooling pipe, promotes heat exchange between the cooling water and the solar photovoltaic-photothermal collector plate, further improves the heat exchange efficiency and prevents water from freezing due to local static; the small pits densely covered on the windward surface of the blade increase the surface area, further strengthen the fluid disturbance and heat transfer effect, so as to realize the high-efficiency anti-freezing and energy transfer of the overall system.

[0037] Specifically, the cross section of the outer pipe fin 24 and the PV plate 23 perpendicular to the cooling water flow direction is similar to the upper half of an inverted triangle, the top edge outer wall is tightly welded with the back plate of the PV plate 23, the middle part of the top edge inner wall of the PV plate 23 is tightly welded with the top of the cooling pipe 1, and the bottom part of the outer pipe fin 24 is welded with the two outer sides of the cooling pipe 1 respectively.

[0038] The cross section design of the inverted triangle is beneficial to uniform heat transfer and ensures that the two sides of the fin are tightly connected with the PV plate and the cooling pipe to form a stable heat conduction path; it is worth mentioning that the outer pipe fin is made of high-quality heat-conducting materials such as copper or aluminum, which ensures high thermal conductivity and structural strength, and lays a foundation for subsequent anti-freezing and high-efficiency heat exchange.

[0039] Specifically, the cross section of the inner pipe fin 26 perpendicular to the cooling water flow direction is type II, the inner pipe fin 26 is integrally formed with the cooling pipe 1 by rolling process, and the inner pipe fin 26 is centrally and mirror-symmetrically distributed with the inner wall top of the welding part of the cooling pipe 1 and the PV plate 23 as the center.

[0040] The design of the type II inner pipe fin 26 can form strong turbulence in the cooling pipe, accelerate water circulation, and further improve the heat exchange efficiency, while preventing freezing due to low water temperature.

[0041] Specifically, the back of the PV plate 23 is coated with thermal insulation material 27; the space surrounded by the outer pipe fin 24, the back plate of the PV plate 23 and the cooling pipe 1 is not coated with thermal insulation material 27, forming a radiation heat exchange space.

[0042] The optimization of radiation heat exchange is realized by setting local insulation and non-insulation areas: the coating of thermal insulation material on the back of the PV plate can prevent heat loss to the back, while the non-insulation treatment of the inner pipe fin and the related space is beneficial to form a radiation heat exchange channel and enhance the heat transfer effect.

[0043] In actual assembly, high-quality copper or aluminum cooling pipes are adopted, and the inner fins of the type II pipes are manufactured through advanced rolling process, while the outer fins and the PV panel are designed as the upper half of the inverted triangle, and are strictly welded with the back plate of the PV panel and the cooling pipe. The cyclone is arranged at the end of the cooling pipe, and the local turbulence is formed through the unique blade structure of the cyclone, so as to further strengthen the heat exchange and anti-freezing effect. The back of the module is covered with high-efficiency insulation material, while the heat exchange area is kept without insulation, so as to form a radiation heat exchange space.

[0044] Embodiment 2

[0045] With reference to Figure 3 For the second embodiment of the present application, the embodiment provides a ground source heat pump industrial heating system, comprising a freeze-proof solar photovoltaic-thermal collector 0, further comprising a solar photovoltaic-thermal collector subsystem, a ground source heat pump subsystem and a multi-time heat storage subsystem;

[0046] The solar photovoltaic-thermal collector subsystem and the ground source heat pump subsystem are connected, and the ground source heat pump subsystem and the multi-time heat storage subsystem are connected.

[0047] The solar photovoltaic-thermal collector subsystem comprises a heat collection water tank 200, a solar heat collection pump 11, a first control shunt valve 17 and a first three-way valve 15, the freeze-proof solar photovoltaic-thermal collector 0 is sequentially connected with the solar heat collection pump 11 and the heat collection water tank 200, the first control shunt valve 17 is arranged between the heat collection water tank 200 and the main circulating pipeline, and the first three-way valve 15 is located at the water outlet end of the freeze-proof solar photovoltaic-thermal collector 0.

[0048] The ground source heat pump subsystem comprises a buried pipe 6, a heat supplement device 7, a heat pump 3, a ground source side circulating pump 12, a second three-way valve 16, a second control shunt valve 18, a third control shunt valve 19 and a fourth control shunt valve 20, the buried pipe 6 is connected with the heat pump 3, the second three-way valve 16 is arranged between the buried pipe 6 and the heat pump 3, the second control shunt valve 18, the third control shunt valve 19, the fourth control shunt valve 20 and the ground source side circulating pump 12 are arranged on the branch pipes of the buried pipe 6 leading to the heat pump 3 and the heat collection water tank 200 respectively.

[0049] The multi-time heat storage subsystem comprises a heat storage water tank 4, a heat load end 5, a heat storage circulating pump 13, a load side circulating pump 14, a fifth control shunt valve 21 and a sixth control shunt valve 22, the heat storage water tank 4 is connected with the condenser side of the heat pump 3 and is connected in parallel with the heat load end 5, the heat storage circulating pump 13 is arranged between the heat storage water tank 4 and the heat pump 3, the fifth control shunt valve 21 is arranged between the heat storage water tank 4 and the heat storage circulating pump 13, and the sixth control shunt valve 22 is arranged on the pipeline of the heat storage water tank 4 and the heat pump 3 leading to the heat load end 5.

[0050] Further comprising a power grid 8, a storage battery 9 and office electricity 10.

[0051] The power grid 8 is connected to the plant micro-grid, which is used to provide power for the system and provide valley electricity for the battery 9;

[0052] The battery 9 is used to store valley electricity from the power grid 8, and release electricity to the system power equipment or office power 10 during the peak and peak period of electricity price;

[0053] The office power 10 is used as a power load to consume the excess power generated by the anti-freezing solar photovoltaic and photo-thermal collector 0 or the electricity released by the battery 9.

[0054] Specifically, the first three-way valve 15 and the second three-way valve 16 are used as key fluid guiding devices, which are respectively connected between the solar photovoltaic and photo-thermal collector 0 and the heat collection water tank 200, and further connected with the ground pipe 6, and are responsible for guiding the heat from the anti-freezing solar photovoltaic and photo-thermal collector 0 to the heat collection water tank 200 or the ground pipe 6, or guiding the medium in the ground pipe 6 back.

[0055] The first control shunt valve 17 is arranged in the solar photovoltaic and photo-thermal collector subsystem to adjust the flow of the heat collection water tank 200.

[0056] The second control shunt valve 18 is connected with the ground pipe 6 and the heat pump 3, and the third control shunt valve 19 and the fourth control shunt valve 20 are responsible for adjusting the distribution of fluid in the ground source heat pump subsystem and between the heat collection water tank 200.

[0057] The fifth control shunt valve 21 and the sixth control shunt valve 22 are arranged in the heat pump heating cycle and the heat storage water tank heating cycle to adjust the flow to the heat load end 5, and control the heating proportion of the heat pump 3 and the heat storage water tank 4 to the heat load end 5.

[0058] Through the cooperation of these valves, the system can accurately control the fluid path and flow according to the operation strategy, so as to realize the cycle switching and optimized distribution under different seasons and load conditions.

[0059] The anti-freezing solar photovoltaic and photo-thermal collector 0 generates electricity, which is preferentially used for the system power equipment, and the excess electricity is supplied to the office power 10; the battery 9 stores valley electricity from the power grid 8, and the battery 9 releases electricity to the system power equipment or office power 10 during the peak and peak period of electricity price; the heat storage water tank 4 stores the excess light and heat of the anti-freezing solar photovoltaic and photo-thermal collector 0 during the day, and the heat generated by the heat pump 3 driven by the excess light and heat; the heat storage water tank 4 stores the valley electricity of the power grid 8 at night and the heat generated by the heat pump 3 driven by the ground pipe 6; the heat storage water tank 4 releases heat to the heat load end 5 during the peak and peak period of electricity price, and the heat load end 5 is the general term of all industrial production links or equipment that need to consume heat energy.

[0060] Specifically, the heat storage water tank 4 is a short-time heat storage device in a day, the heat storage water tank 4 is connected with the condenser side of the heat pump 3, and the heat storage water tank 4 is connected in parallel with the heat load end 5; the ground buried pipe 6 is a cross-season heat storage device.

[0061] The short-time heat storage in a day is realized through the water tank, heat is stored in the low valley of electricity price and released in the peak, the underground soil and the ground buried pipe are utilized to form the cross-season heat storage device, long-term storage of residual heat in summer is realized, and winter heating is ensured.

[0062] Specifically, the pipeline starts from the anti-freezing solar photovoltaic photo-thermal collector 0, passes through the solar heat pump 11, the heat storage water tank 200, the first control shunt valve 17, the first three-way valve 15, and finally connects the anti-freezing solar photovoltaic photo-thermal collector 0 from the first three-way valve 15, to form a solar photovoltaic photo-thermal collector heat collection cycle; the solar photovoltaic photo-thermal collector heat collection cycle operates in winter and the transition season and when the solar radiation is not less than 100 W / m2; the pipeline starts from the anti-freezing solar photovoltaic photo-thermal collector 0, passes through the solar heat pump 11, the heat storage water tank 200, the first control shunt valve 17, the second three-way valve 16, the ground buried pipe 6, the second control shunt valve 18, and the first three-way valve 15, and finally connects the anti-freezing solar photovoltaic photo-thermal collector 0 from the first three-way valve 15, to form a cross-season heat storage cycle; the cross-season heat storage cycle operates in summer and when the solar radiation is not less than 100 W / m2; the medium of the solar photovoltaic photo-thermal collector heat collection cycle and the cross-season heat storage cycle is water.

[0063] The solar photovoltaic photo-thermal collector heat collection cycle mainly operates in winter and the transition season under good solar radiation conditions (≥100 W / m2), and collects solar heat and transmits the heat to the heat storage water tank; the cross-season heat storage cycle operates in summer, and stores excess heat energy in the underground soil through the ground buried pipe.

[0064] Specifically, the pipeline starts from the ground buried pipe 6, passes through the second control shunt valve 18, the third control shunt valve 19, the fourth control shunt valve 20, the ground source side circulating pump 12, the heat pump 3, and the second three-way valve 16, and finally connects the ground buried pipe 6 from the second three-way valve 16, to form a heat pump ground source heat source cycle; the pipeline starts from the ground buried pipe 6, passes through the second control shunt valve 18, the third control shunt valve 19, the heat storage water tank 200, the fourth control shunt valve 20, the ground source side circulating pump 12, the heat pump 3, and the second three-way valve 16, and finally connects the ground buried pipe 6 from the second three-way valve 16, to form a heat pump ground source solar series double heat source cycle; the medium of the heat pump ground source heat source cycle and the heat pump ground source solar series double heat source cycle is water.

[0065] The embodiment respectively constructs two circulating loops driven by heat pump: one is a ground source heat source cycle directly using soil heat energy in the ground pipe, and the other is a double heat source cycle connecting solar heat energy in the heat storage water tank with underground heat energy, so as to further improve the heating efficiency of the heat pump.

[0066] Specifically, the pipeline starts from the heat pump 3, passes through the heat storage circulating pump 13, the fifth control shunt valve 21, the load side circulating pump 14, the heat load end 5, the sixth control shunt valve 22, and finally connects the heat pump 3 from the sixth control shunt valve 22, to form a heat pump heating cycle; the pipeline starts from the heat storage water tank 4, passes through the fifth control shunt valve 21, the heat load end 5, the sixth control shunt valve 22, and finally connects the heat storage water tank 4 from the sixth control shunt valve 22, to form a heat storage water tank heating cycle; the medium of the heat pump heating cycle and the heat storage water tank heating cycle is water.

[0067] The embodiment clearly defines two heating circuits for finally delivering heat energy to the heat load end: one is directly heated by the heat pump, and the other is heated by the heat storage water tank, to realize the regulating effect of peak load shifting of the power grid.

[0068] Specifically, the anti-freezing solar photovoltaic photo-thermal collector 0, the power grid 8, the storage battery 9, the heat pump 3, the solar heat pump 11, the ground source side circulating pump 12, the heat storage circulating pump 13, the load side circulating pump 14 and the office electricity 10 are connected with the plant microgrid for interaction.

[0069] The embodiment emphasizes the interaction between the entire heating system and the plant microgrid, realizes the coordinated management of electric energy and heat energy, stores the off-peak power of the power grid through the storage battery, and preferentially uses self-generated power, which not only ensures the stable operation of the heating system, but also realizes the intelligent scheduling and energy saving of energy.

[0070] The operation mode of the ground source heat pump industrial heating system is as follows:

[0071] Mode 1: The solar photovoltaic photo-thermal collector system stores heat in the ground pipe. In the case of high light intensity, the solar photovoltaic photo-thermal collector system transfers the collected heat to the ground pipe, and stores the excess heat through the underground heat storage method.

[0072] Working loop: solar photovoltaic photo-thermal collector 0→solar heat pump 11→heat storage water tank 200→first control shunt valve 17→second three-way valve 16→ground pipe 6→second control shunt valve 18→three-way valve 15→solar photovoltaic photo-thermal collector 0.

[0073] Mode 2: The ground source heat pump subsystem stores heat in the heat storage water tank. The ground source heat pump subsystem uses off-peak power or other conditions to run and store heat in the heat storage water tank for subsequent heating.

[0074] Working loop: Ground source heat pump 3→ Ground source side heat storage circulating pump 13→ Fifth control shunt valve 21→ Heat storage water tank 4→ Sixth control shunt valve 22→ Ground source heat pump 3.

[0075] Mode 3: Ground source heat pump subsystem heating, when there is a heat load, the ground source heat pump subsystem directly provides heat to meet the demand.

[0076] Working loop: Buried pipe 6→ Second control shunt valve 18→ Third control shunt valve 19→ Ground source side circulating pump 12→ Ground source heat pump 3→ Buried pipe 6; Ground source heat pump 3→ Load side circulating pump 14→ Heat load end 5→ Sixth control shunt valve 22→ Ground source heat pump 3.

[0077] Mode 4: Ground source heat pump subsystem and heat storage water tank combined heating, when there is a high heat load demand, the ground source heat pump subsystem and the heat storage water tank work together to provide sufficient heat.

[0078] Working loop: Ground source heat pump 3+ Heat storage water tank 4→ Fifth control shunt valve 21→ Load side circulating pump 14→ Heat load end 5→ Sixth control shunt valve 22→ Ground source heat pump 3+ Heat storage water tank 4.

[0079] Mode 5: Solar photovoltaic and thermal collector and ground source heat pump subsystem combined heating, under the condition of meeting the heat load, the solar photovoltaic and thermal collector and the ground source heat pump subsystem work together to optimize energy utilization and improve heating efficiency.

[0080] Working loop: Buried pipe 6→ Second control shunt valve 18→ Third control shunt valve 19→ Heat collection water tank 200→ Fourth control shunt valve 20→ Ground source side circulating pump 12→ Ground source heat pump 3→ Load circulating pump 14→ Heat load end 5→ Sixth control shunt valve 22→ Ground source heat pump 3.

[0081] Mode 6: Solar photovoltaic and thermal collector, ground source heat pump subsystem and heat storage water tank combined heating.

[0082] Working loop: Buried pipe 6→ Second control shunt valve 18→ Third control shunt valve 19→ Heat collection water tank 200→ Fourth control shunt valve 20→ Ground source side circulating pump 12→ Ground source heat pump 3+ Heat storage water tank 4→ Fifth control shunt valve 21→ Load side circulating pump 14→ Heat load end 5→ Sixth control shunt valve 22→ Ground source heat pump 3+ Heat storage water tank 4.

[0083] The operation strategy of a ground source heat pump industrial heating system is as follows:

[0084] When there is a heat load demand, the system preferentially starts the ground source heat pump subsystem heating. When the light intensity is higher than 100 W / m 2The solar photovoltaic photo-thermal collector system starts to operate under the condition that the solar photovoltaic photo-thermal collector system starts to operate, and the solar heat pump starts to operate, and the collected heat energy is transferred to the buried pipe for heat storage (mode 1). If it is summer, the heat storage capacity of the heat storage water tank is sufficient, and the heat storage water tank can output, the operation strategy is that the solar photovoltaic photo-thermal collector stores heat in the buried pipe (mode 1) and the ground source heat pump subsystem and the heat storage water tank jointly supply heat (mode 4) are operated together. If it is summer, the heat storage water tank needs heat and the heat storage water tank cannot output, the operation strategy is that the solar photovoltaic photo-thermal collector stores heat in the buried pipe (mode 1) and the ground source heat pump subsystem supplies heat (mode 3) are operated together. If it is not summer, the solar photovoltaic photo-thermal collector can meet the heat load demand, the operation strategy is that the solar photovoltaic photo-thermal collector, the ground source heat pump subsystem and the heat storage water tank jointly supply heat (mode 6) are operated together. If it is not summer, the solar photovoltaic photo-thermal collector cannot meet the heat load demand, the operation strategy is that the solar photovoltaic photo-thermal collector and the ground source heat pump subsystem jointly supply heat (mode 5).

[0085] If the light intensity is lower than 100 W / m 2 , the heat storage capacity of the heat storage water tank is sufficient, and the heat storage water tank can output, the operation strategy is that the ground source heat pump subsystem and the heat storage water tank jointly supply heat (mode 4). If the light intensity is lower than 100 W / m 2 , the heat storage capacity of the heat storage water tank is insufficient, and the heat storage water tank cannot output, the operation strategy is that the ground source heat pump subsystem supplies heat (mode 3).

[0086] When there is no heat load, and the heat storage water tank has heat storage capacity, the operation strategy is that the ground source heat pump subsystem stores heat in the heat storage water tank (mode 2).

[0087] When there is no heat load, and the heat storage water tank has no heat storage capacity, the ground source heat pump subsystem is closed.

[0088] The system of the scheme constructs the solar photovoltaic photo-thermal collector heat collection cycle, the cross-season heat storage cycle, the ground source heat source cycle of the heat pump, the ground source solar series double heat source cycle of the heat pump, the heat pump heat supply cycle and the heat storage water tank heat supply cycle, which is rich in functions and facilitates the realization of mode switching; during the day, the ground source series solar photovoltaic photo-thermal collector can be used to collect heat to drive the heat pump with double heat sources, to ensure the efficient operation of the heat pump and reduce the soil heat extraction during the day, to ensure the efficient operation of the ground source heat pump at night; in summer, the solar photovoltaic photo-thermal collector stores solar energy in the soil, maintains the soil heat balance, ensures the stable and efficient operation of the ground source heat pump during the life cycle, and distributes the abundant solar energy in summer to winter and transition season in the form of cross-season heat storage; the solar photovoltaic photo-thermal collector coupled with multi-time heat storage realizes peak shaving and valley filling in different time scales of the power grid, and reduces the cost of industrial heat; the mode of coupling the solar photovoltaic photo-thermal collector with the ground source heat pump is effectively expanded to the whole year heat supply scene.

[0089] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced, without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A frost protection solar photovoltaic and photothermal collector (0) characterized in that: The application relates to a freeze-proof solar photovoltaic and photo-thermal collector (0) comprising a cooling pipe (1) and a heat exchange element (2) arranged on the side of the cooling pipe (1) and comprising a PV plate (23), a pipe outer fin (24), a cyclone (25) and a pipe inner fin (26), wherein the PV plate (23) is connected with the cooling pipe (1) at the central axis, the pipe outer fin (24) is symmetrically arranged on both sides of the cooling pipe (1), the length of the pipe outer fin (24) in the axial direction of the cooling pipe (1) is equal to the sum of the axial length of the cooling pipe (1) and the axial length of the cyclone (25), the two ends of the pipe outer fin (24) are connected with the PV plate (23) and the cooling pipe (1) respectively, the cyclone (25) is arranged at the end of the cooling pipe (1), and the pipe inner fin (26) is fixedly connected with the inner wall of the cooling pipe (1). The cross section of the pipe outer fin (24) and the PV plate (23) perpendicular to the flowing direction of the cooling water is similar to the upper half of an inverted triangle, the outer wall of the top edge is welded with the back plate of the PV plate (23), the middle part of the inner wall of the top edge of the PV plate (23) is welded with the top of the cooling pipe (1), and the bottom parts of the two inclined edges are welded with the two outer sides of the cooling pipe (1) respectively. The cross section of the pipe inner fin (26) perpendicular to the flowing direction of the cooling water is type II, the pipe inner fin (26) is integrally formed with the cooling pipe (1), and the pipe inner fin (26) is centrally symmetrically distributed with the top of the inner wall of the welding position of the cooling pipe (1) and the PV plate (23) as the center.

2. The anti-freeze solar photovoltaic and photothermal collector (0) as claimed in claim 1, wherein: The back of the PV plate (23) is coated with thermal insulation material (27).

3. The anti-freeze solar photovoltaic photo-thermal collector (0) as claimed in claim 1, wherein: The thermal insulation material (27) covers the back plate of the PV plate (23) and takes the pipe outer fin (24) and the cooling pipe (1) as the boundary, so that a radiation heat exchange space is formed in the area surrounded by the three.

4. The anti-freeze solar photovoltaic photo-thermal collector (0) as claimed in claim 2, wherein: The application further relates to a freeze-proof solar photovoltaic and photo-thermal collector (0) as claimed in any one of claims 1-4, further comprising a solar photovoltaic and photo-thermal collector subsystem, a ground source heat pump subsystem and a multi-time heat storage subsystem. The solar photovoltaic and photo-thermal collector subsystem and the ground source heat pump subsystem are connected, and the ground source heat pump subsystem and the multi-time heat storage subsystem are connected.

5. A ground source heat pump industrial heating system, characterized by:

6. The ground source heat pump industrial heating system as claimed in claim 5, wherein the solar photovoltaic and photo-thermal collector subsystem comprises a heat collecting water tank (200), a solar heat collecting pump (11), a first control shunt valve (17) and a first three-way valve (15), the freeze-proof solar photovoltaic and photo-thermal collector (0) is sequentially connected with the solar heat collecting pump (11) and the heat collecting water tank (200), the first control shunt valve (17) is arranged between the heat collecting water tank (200) and a main circulating pipeline, and the first three-way valve (15) is located at the water outlet end of the freeze-proof solar photovoltaic and photo-thermal collector (0).

7. The ground source heat pump industrial heating system as claimed in claim 6, wherein ​ ​ ​ ​ The ground source heat pump subsystem comprises a ground buried pipe (6), a heat supplement device (7), a heat pump (3), a ground source side circulating pump (12), a second three-way valve (16), a second control shunt valve (18), a third control shunt valve (19), and a fourth control shunt valve (20), the ground buried pipe (6) is connected with the heat pump (3), the second three-way valve (16) is arranged between the ground buried pipe (6) and the heat pump (3), and the second control shunt valve (18), the third control shunt valve (19), the fourth control shunt valve (20), and the ground source side circulating pump (12) are arranged on the branch of the ground buried pipe (6) leading to the heat pump (3) and the heat storage water tank (200) respectively.

8. The ground source heat pump industrial heating system according to claim 7, wherein: The multi-time heat storage subsystem comprises a heat storage water tank (4), a heat load end (5), a heat storage circulating pump (13), a load side circulating pump (14), a fifth control shunt valve (21), and a sixth control shunt valve (22), the heat storage water tank (4) is connected with the condenser side of the heat pump (3) and is connected in parallel with the heat load end (5), the heat storage circulating pump (13) is arranged between the heat storage water tank (4) and the heat pump (3), the fifth control shunt valve (21) is arranged between the heat storage water tank (4) and the heat storage circulating pump (13), and the sixth control shunt valve (22) is arranged on the pipeline of the heat storage water tank (4) and the heat pump (3) leading to the heat load end (5).

9. The ground source heat pump industrial heating system according to claim 8, wherein: Further comprising a power grid (8), a storage battery (9), and office electricity (10); The power grid (8) is connected with a plant microgrid, and is used for providing electric energy for the system and valley electricity for the storage battery (9); The storage battery (9) is used for storing valley electricity from the power grid (8) and releasing electric quantity to system electrical equipment or the office electricity (10) during price peak and peak period; The office electricity (10) is used as electrical load, and is used for consuming surplus power generation of the anti-freezing solar photovoltaic and photo-thermal heat collector (0) or electric quantity released by the storage battery (9).

10. The ground source heat pump industrial heating system according to claim 9, wherein: The heat storage water tank (4) is used as a short-time heat storage device within a day, and the ground buried pipe (6) is used as a cross-season heat storage device.

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