High-efficiency phase change cold storage refrigeration house system driven by photovoltaic-mains supply cooperatively

Abstract

The invention belongs to the technical field of new energy application and refrigeration house energy conservation and discloses a photovoltaic-mains supply synergistically driven efficient phase change cold storage refrigeration house system which comprises a refrigeration module, the refrigeration module comprises a power generation mechanism, the power generation mechanism is connected with a vortex refrigeration unit, and an evaporation side and a condensation side are arranged on the two sides of the vortex refrigeration unit respectively. The condensation side is communicated with a closed cooling tower, the evaporation side is communicated with a cold storage module, the cold storage module comprises a cold storage tank, an ethylene glycol phase change material is arranged in the cold storage tank, one end of the cold storage tank is communicated with a vortex refrigerating unit through a three-way valve and a freezing pump, and the other end of the cold storage tank is communicated with a cold release module; the cold releasing module comprises a first refrigerating mechanism and a second refrigerating mechanism which are symmetrically arranged in the refrigeration house, and the first refrigerating mechanism and the second refrigerating mechanism communicate with the cold storage tank and the vortex refrigerating unit correspondingly. By integrating the photovoltaic power generation technology, the commercial power complementary power supply technology and the ethylene glycol phase change cold storage technology, efficient cold supply and energy cost optimization of the cold storage are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy application and cold storage energy conservation, and particularly relates to a high-efficiency phase change energy storage cold storage system driven by photovoltaic-mains electricity collaboration. Background Art

[0002] With the continuous and rapid development of China's economy, the energy demand is increasing day by day, and the environmental pressure and energy cost problems brought by the traditional energy structure are becoming more and more prominent. Against this background, the development and utilization of clean energy has become an important direction for achieving sustainable development. As one of the most potential renewable energies, solar energy has significant advantages such as infinite reserves, wide distribution, and zero carbon emissions, and its application technology has expanded from single power generation to multi-energy collaboration. At the same time, with the upgrading of consumption and the rise of fresh food e-commerce, the demand for cold chain logistics has increased sharply. As the core facility to ensure the quality of perishable goods such as food and medicine, the scale and energy efficiency level of cold storage need to be improved urgently. However, traditional cold storage highly relies on mains electricity to drive refrigeration equipment, especially the operating cost is high during peak electricity price periods, and there is also a risk of cold quantity interruption and cargo spoilage when power outages occur. Summary of the Invention

[0003] The purpose of the present invention is to provide a high-efficiency phase change energy storage cold storage system driven by photovoltaic-mains electricity collaboration to solve the problems existing in the above-mentioned prior art.

[0004] To achieve the above purpose, the present invention provides the following solution: The present invention provides a high-efficiency phase change energy storage cold storage system driven by photovoltaic-mains electricity collaboration, including a refrigeration module. The refrigeration module includes a power generation mechanism, the power generation mechanism is connected to a scroll refrigeration unit, both sides of the scroll refrigeration unit are respectively provided with an evaporation side and a condensation side, the condensation side is communicated with a closed cooling tower, the evaporation side is communicated with a cold energy storage module. The cold energy storage module includes a cold energy storage tank, ethylene glycol phase change material is arranged in the cold energy storage tank, one end of the cold energy storage tank is communicated with the scroll refrigeration unit through a three-way valve and a freezing pump, the other end of the cold energy storage tank is communicated with a cold release module, and the cold release module includes a first refrigeration mechanism and a second refrigeration mechanism symmetrically arranged in the cold storage. The first refrigeration mechanism and the second refrigeration mechanism are respectively communicated with the cold energy storage tank and the scroll refrigeration unit.

[0005] Preferably, a spray pump and a heat dissipation fan are arranged on the closed cooling tower, and the closed cooling tower is communicated with a make-up water pump. The heat dissipation efficiency is improved through water circulation and forced convection heat dissipation.

[0006] Preferably, a first constant pressure tank and a cooling pump are respectively communicated between the closed cooling tower and the condensation side. The cooling pump drives the cooling water to circulate between the closed cooling tower and the condensation side to improve the heat dissipation power.

[0007] Preferably, a pressure sensor is provided between the evaporation side and the condensation side to monitor the refrigerant circulation state in real time.

[0008] Preferably, a honeycomb flow channel is provided in the cold storage tank, which can optimize the refrigerant flow rate and shorten the charging and discharging time.

[0009] Preferably, the first refrigeration mechanism includes a first air cooler disposed in the cold storage. The first air cooler is respectively connected to the cold storage tank and the evaporation side. The first air cooler is connected to the evaporation side through a third two-way valve. A first electric heating wire is provided on one side of the first air cooler, and a first blower is provided on the side of the first electric heating wire away from the first air cooler.

[0010] Preferably, the second refrigeration mechanism includes a second air cooler disposed in the cold storage. The second air cooler is respectively connected to the cold storage tank and the evaporation side. The second air cooler is connected to the evaporation side through a second two-way valve. A second electric heating wire is provided on one side of the second air cooler, and a second blower is provided on the side of the second electric heating wire away from the second air cooler.

[0011] Preferably, one end of the second two-way valve away from the second air cooler and one end of the third two-way valve away from the first air cooler are connected to the evaporation side through a first connecting pipe. A second constant pressure tank is provided at the end of the first connecting pipe close to the evaporation side. The cold storage tank is connected to the first air cooler and the second air cooler respectively through a second connecting pipe. The first connecting pipe and the second connecting pipe are connected through a first two-way valve.

[0012] Preferably, copper tube heat exchangers are respectively provided in the first air cooler and the second air cooler.

[0013] Preferably, the power generation mechanism includes a photovoltaic panel. The photovoltaic panel is connected to an inverter, and the inverter is connected to a distribution box. The distribution box is respectively connected to the commercial power and a control cabinet. The control cabinet dynamically switches between photovoltaic / mains power supply through the distribution box.

[0014] The present invention discloses the following technical effects: The power generation mechanism provides two power generation modes of photovoltaic power generation and commercial power, and can simultaneously realize the switching between photovoltaic direct current and commercial power alternating current. The scroll refrigeration unit absorbs heat and refrigerates on the evaporation side through a compression cycle, and the heat on the condensation side is discharged by a closed cooling tower. The storage tank body of the cold storage tank adopts a heat preservation structure and is filled with ethylene glycol phase change material. Through the refrigeration coil, the refrigerant in the coil absorbs the heat of the ethylene glycol solution close to the coil to make it phase change and store cold energy. The chilled water pump drives the ethylene glycol solution to circulate between the refrigeration module and the cold storage tank, and exchanges heat between the low-temperature ethylene glycol solution and the air in the cold storage through the first refrigeration mechanism and the second refrigeration mechanism, improving the heat exchange efficiency. By integrating photovoltaic power generation, commercial power complementary power supply and ethylene glycol phase change cold storage technology, the present invention realizes efficient cooling of the cold storage and optimization of energy costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of this application are used to provide a further understanding of this application. The schematic embodiments and descriptions thereof of this application are used to explain this application and do not constitute an improper limitation of this application. In the drawings:

[0016] Figure 1 It is a schematic diagram of the high-efficiency phase change cold storage system driven by photovoltaic-commercial power collaboration of the present invention.

[0017] In the figure: 1, photovoltaic panel; 2, inverter; 3, commercial power; 4, distribution box; 5, control cabinet; 6, cooling fan; 7, closed cooling tower; 8, closed tower spray pump; 9, makeup water valve; 10, first constant pressure tank; 11, cooling pump; 12, condensation side; 13, scroll refrigeration unit; 14, evaporation side; 15, chilled water pump; 16, second constant pressure tank; 17, cold storage tank; 18, three-way valve; 19, first two-way valve; 20, second two-way valve; 21, third two-way valve; 22, first cooling fan; 23, first electric heating wire; 24, first blower; 25, second cooling fan; 26, second electric heating wire; 27, second blower; 28, cold storage. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0020] Refer to Figure 1As shown in the figure, this embodiment provides an efficient phase-change energy storage cold storage system driven by photovoltaic-mains grid collaboration, which includes a refrigeration module. The refrigeration module includes a power generation mechanism. The power generation mechanism is connected to a scroll refrigeration unit 13. An evaporation side 14 and a condensation side 12 are respectively arranged on both sides of the scroll refrigeration unit 13. The condensation side 12 is communicated with a closed cooling tower 7, and the evaporation side 14 is communicated with a cold energy storage module. The cold energy storage module includes a cold storage tank 17. An ethylene glycol phase-change material is arranged in the cold storage tank 17. One end of the cold storage tank 17 is communicated with the scroll refrigeration unit 13 through a three-way valve 18 and a refrigeration pump 15, and the other end of the cold storage tank 17 is communicated with a cold release module. The cold release module includes a first refrigeration mechanism and a second refrigeration mechanism symmetrically arranged in the cold storage 28. The first refrigeration mechanism and the second refrigeration mechanism are respectively communicated with the cold storage tank 17 and the scroll refrigeration unit 13.

[0021] The power generation mechanism provides two power generation modes of photovoltaic power generation and mains grid power 3, and can realize the switching between photovoltaic direct current and mains grid power 3 alternating current at the same time. The scroll refrigeration unit 13 absorbs heat and refrigerates on the evaporation side 14 through a compression cycle, and the heat on the condensation side 12 is discharged by the closed cooling tower 7. The tank body of the cold storage tank 17 adopts a heat preservation structure and is filled with an ethylene glycol phase-change material. Through a refrigeration coil, the refrigerant in the coil absorbs the heat of the ethylene glycol solution close to the coil to make it phase-change and store cold energy. The refrigeration pump 15 drives the ethylene glycol solution to circulate between the refrigeration module and the cold storage tank 17, and the low-temperature ethylene glycol solution exchanges heat with the air in the cold storage 28 through the first refrigeration mechanism and the second refrigeration mechanism to improve the heat exchange efficiency. The present invention realizes the efficient cooling of the cold storage 28 and the optimization of energy cost by integrating photovoltaic power generation, mains grid power 3 complementary power supply and ethylene glycol phase-change energy storage technology.

[0022] In a further optimized solution, a spray pump and a heat dissipation fan 6 are arranged on the closed cooling tower 7, and the closed cooling tower 7 is communicated with a makeup water pump. The heat dissipation efficiency is improved through water circulation and forced convection heat dissipation.

[0023] In a further optimized solution, a first constant pressure tank 10 and a cooling pump 11 are respectively communicated between the closed cooling tower 7 and the condensation side 12. The cooling pump 11 drives the cooling water to circulate between the closed cooling tower 7 and the condensation side 12 to improve the heat dissipation power.

[0024] In a further optimized solution, a pressure sensor is arranged between the evaporation side 14 and the condensation side 12 to monitor the refrigerant circulation state in real time.

[0025] In a further optimized solution, a honeycomb flow channel is arranged in the cold storage tank 17, which can optimize the refrigerant flow rate and shorten the charging and cold release time.

[0026] The ethylene glycol phase-change material adopts a composite phase-change material to strengthen the heat transfer performance and increase the latent heat density.

[0027] For a further optimized solution, the first refrigeration mechanism includes a first air cooler 22 disposed in the cold storage 28. The first air cooler 22 is respectively connected to the cold storage tank 17 and the evaporation side 14. The first air cooler 22 is connected to the evaporation side 14 through a third two-way valve 21. A first electric heating wire 23 is provided on one side of the first air cooler 22, and a first blower 24 is provided on the side of the first electric heating wire 23 away from the first air cooler 22.

[0028] For a further optimized solution, the second refrigeration mechanism includes a second air cooler 25 disposed in the cold storage 28. The second air cooler 25 is respectively connected to the cold storage tank 17 and the evaporation side 14. The second air cooler 25 is connected to the evaporation side 14 through a second two-way valve 20. A second electric heating wire 26 is provided on one side of the second air cooler 25, and a second blower is provided on the side of the second electric heating wire 26 away from the second air cooler 25.

[0029] The first blower 24 and the second blower 27 force air circulation, reduce the temperature fluctuation in the warehouse, and control the adjustable range of the wind speed. Anti-icing coatings are respectively coated on the blade surfaces of the first blower 24 and the second blower 27 to improve the operation stability in a low-temperature environment. The first electric heating wire 23 and the second electric heating wire 26 are started when the ambient temperature is relatively low, and the power is adjusted in a gradient manner to prevent the pipeline from freezing.

[0030] For a further optimized solution, one end of the second two-way valve 20 away from the second air cooler 25 and one end of the third two-way valve 21 away from the first air cooler 22 are connected to the evaporation side 14 through a first connecting pipe. A second constant pressure tank 16 is provided at the end of the first connecting pipe close to the evaporation side 14. The cold storage tank 17 is connected to the first air cooler 22 and the second air cooler 25 respectively through a second connecting pipe. The first connecting pipe and the second connecting pipe are connected through a first two-way valve 19.

[0031] For a further optimized solution, copper tube heat exchangers are respectively provided in the first air cooler 22 and the second air cooler 25. The low-temperature ethylene glycol solution exchanges heat with the air in the warehouse to improve the heat exchange efficiency. The first air cooler 22 and the second air cooler 25 are driven by frequency conversion and the rotation speed is adjusted in real time according to the temperature in the warehouse to effectively reduce energy consumption.

[0032] The condensed water generated by the first air cooler 22 and the second air cooler 25 is filtered by a collection tank and purified by a reverse osmosis module for use as spray makeup water for the closed cooling tower 7.

[0033] For a further optimized solution, the power generation mechanism includes a photovoltaic panel 1. The photovoltaic panel 1 is connected to an inverter 2, the inverter 2 is connected to a distribution box 4, the distribution box 4 is respectively connected to the commercial power 3 and a control cabinet 5, and the control cabinet 5 dynamically switches between photovoltaic / commercial power supply through the distribution box 4.

[0034] The photovoltaic panel 1 adopts monocrystalline silicon photovoltaic modules, and the total installed capacity is matched according to the load demand of the cold storage 28, which is used to convert solar energy into direct current. The inverter 2 supports the switching between photovoltaic direct current and commercial power 3 alternating current, and realizes the grid connection or storage of surplus electricity. The commercial power 3 interface is connected to the municipal power grid, serving as a complementary power source for photovoltaic power generation, and supporting cold storage during off-peak electricity price periods. The control cabinet 5 integrates a multi-source data acquisition unit (temperature, pressure, light intensity, power load), a PLC logic controller, and an optimization algorithm module.

[0035] Photovoltaic priority power supply and cold storage mode: When the light intensity is sufficient and the photovoltaic power meets the refrigeration demand, the photovoltaic priority power supply and cold storage mode is adopted. The photovoltaic panel 1 converts solar energy into direct current, which is converted into alternating current by the inverter 2 and then input into the distribution box 4. Through photovoltaic power generation, the control cabinet 5 preferentially drives the scroll refrigeration unit 13, the chilled water pump 15, and the cooling water pump 11. After the scroll refrigeration unit 13 starts, the refrigerant absorbs the heat of the ethylene glycol solution on the evaporation side 14, and the solution temperature drops to the phase change temperature. The low-temperature ethylene glycol solution flows into the cold storage tank 17, triggering the phase change material to solidify and release heat, and the cold is stored in the tank. The closed cooling tower 7 discharges the waste heat on the condensation side 12 through the cooling fan 6 and the spray pump. If there is surplus photovoltaic power, it is stored in the cold storage tank 17 through the overload refrigeration unit, or fed back to the municipal power grid through the inverter 2.

[0036] Commercial power 3 supplementary power supply and cold storage mode: During the off-peak electricity price period at night or when the light intensity is insufficient during the day, the commercial power 3 supplementary power supply and cold storage mode is adopted. The distribution box 4 switches to the commercial power 3 power supply to drive the refrigeration unit to operate. At the same time, the first constant pressure tank 10, the second constant pressure tank 16, and the makeup water valve 9 maintain the system pressure stability to prevent cavitation. The three-way valve 18 adjusts the refrigerant flow direction, switching the refrigerant flow direction to the cold storage tank 17 to ensure the charging efficiency of the cold storage tank 17. The three two-way valves adjust the branch flow to ensure the cold storage rate and the tank body temperature, and complete the dynamic adjustment.

[0037] Cold storage tank 17 cold release mode: In the case of peak electricity price or interruption of commercial power 3 power supply, the cold storage tank 17 cold release mode is adopted. The chilled water pump 15 drives the ethylene glycol solution to flow through the cold storage tank 17, and the phase change material melts and absorbs heat, and the solution temperature decreases. The low-temperature solution exchanges heat with the air in the cold storage 28 through the first cooling fan 22 and the second cooling fan 25, and the first blower 24 and the second blower force the circulation to maintain the temperature of the cold storage 28. The first electric heating wire 23 and the second electric heating wire 26 start at a lower temperature to prevent the ethylene glycol solution in the pipeline from freezing, so as to ensure that the cold of the cold storage tank 17 can maintain the cold storage temperature for more than 12 hours.

[0038] The high-efficiency phase-change cold storage system driven by photovoltaic-mains power 3 integrates mains power 3 and distributed photovoltaic energy to drive the operation of the scroll refrigeration unit 13, and cooperatively utilizes the ethylene glycol cold storage tank 17 to achieve efficient refrigeration and cold storage. The system uses solar panels to convert light energy into electrical energy, which preferentially powers the refrigeration unit, the chilled water pump 15 and the cooling water pump 11, and stores the cold energy in the ethylene glycol phase-change cold storage tank 17 during sufficient sunlight hours. In areas with a relatively high solar radiation intensity, the system can significantly improve the utilization rate of photovoltaic energy, store the excess electrical energy in the cold storage tank 17 or feed it into the municipal power grid, which not only relieves the load pressure on the power grid during peak periods, but also reduces the comprehensive electricity cost of the cold storage 28 through the "photovoltaic power generation + cold storage in off-peak hours" mode. This technology not only provides a "green cooling" solution for cold chain logistics, but also promotes the deep integration and industrial development of photovoltaic technology and cold storage systems through the collaborative optimization of multiple energy sources.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0040] The embodiments described above are only for describing the preferred mode of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. An efficient phase change energy storage cold storage system driven by photovoltaic-mains electricity collaboration, characterized in that: It includes a refrigeration module, and the refrigeration module includes a power generation mechanism which is connected to a scroll refrigeration unit (13). On both sides of the scroll refrigeration unit (13), there are an evaporation side (14) and a condensation side (12) respectively. The condensation side (12) is communicated with a closed cooling tower (7), and the evaporation side (14) is communicated with a cold storage module. The cold storage module includes a cold storage tank (17) which is provided with an ethylene glycol phase change material. One end of the cold storage tank (17) is communicated with the scroll refrigeration unit (13) through a three-way valve (18) and a chilled water pump (15), and the other end of the cold storage tank (17) is communicated with a cold release module. The cold release module includes a first refrigeration mechanism and a second refrigeration mechanism symmetrically arranged in a cold storage (28). The first refrigeration mechanism and the second refrigeration mechanism are respectively communicated with the cold storage tank (17) and the scroll refrigeration unit (13).

2. The high-efficiency phase-change energy storage cold storage system driven by photovoltaic-mains electricity collaboration according to claim 1, wherein: A spray pump and a cooling fan (6) are provided on the closed cooling tower (7), and the closed cooling tower (7) is communicated with a make-up water pump.

3. The high-efficiency phase-change energy storage cold storage system driven by photovoltaic-mains grid collaboration according to claim 1, wherein: A first constant pressure tank (10) and a cooling pump (11) are respectively communicated between the closed cooling tower (7) and the condensation side (12).

4. The high-efficiency phase-change energy storage cold storage system driven by photovoltaic-mains grid collaboration according to claim 1, characterized in that: A pressure sensor is provided between the evaporation side (14) and the condensation side (12).

5. The high-efficiency phase-change energy storage cold storage system driven by photovoltaic-mains grid collaboration according to claim 1, characterized in that: A honeycomb flow channel is provided in the cold storage tank (17).

6. The high-efficiency phase-change energy storage cooling cold storage system driven by photovoltaic-mains power collaboration according to claim 1, wherein: The first refrigeration mechanism includes a first cooling fan (22) arranged in the cold storage (28). The first cooling fan (22) is respectively communicated with the cold storage tank (17) and the evaporation side (14). The first cooling fan (22) is communicated with the evaporation side (14) through a third two-way valve (21). A first electric heating wire (23) is provided on one side of the first cooling fan (22), and a first blower (24) is provided on the side of the first electric heating wire (23) away from the first cooling fan (22).

7. The high-efficiency phase-change energy storage cold storage system driven by photovoltaic-mains electricity collaboration according to claim 6, characterized in that: The second refrigeration mechanism includes a second cooling fan (25) arranged in the cold storage (28). The second cooling fan (25) is respectively communicated with the cold storage tank (17) and the evaporation side (14). The second cooling fan (25) is communicated with the evaporation side (14) through a second two-way valve (20). A second electric heating wire (26) is provided on one side of the second cooling fan (25), and a second blower (27) is provided on the side of the second electric heating wire (26) away from the second cooling fan (25).

8. The high-efficiency phase change energy storage cold storage system driven by photovoltaic-mains grid collaboration according to claim 7, wherein: One end of the second two-way valve (20) away from the second cooling fan (25) and one end of the third two-way valve (21) away from the first cooling fan (22) are communicated with the evaporation side (14) through a first connecting pipe. A second constant pressure tank (16) is provided at the end of the first connecting pipe close to the evaporation side (14). The cold storage tank (17) is communicated with the first cooling fan (22) and the second cooling fan (25) respectively through a second connecting pipe. The first connecting pipe and the second connecting pipe are communicated through a first two-way valve (19).

9. The high-efficiency phase-change energy storage cold storage system driven by photovoltaic-mains grid collaboration according to claim 7, wherein: Copper tube heat exchangers are respectively provided in the first cooling fan (22) and the second cooling fan (25).

10. The high-efficiency phase change energy storage cold storage system driven by photovoltaic-mains grid collaboration according to claim 1, characterized in that: The power generation mechanism includes a photovoltaic panel (1), the photovoltaic panel (1) is connected to an inverter (2), the inverter (2) is connected to a distribution box (4), the distribution box (4) is respectively connected to the commercial power (3) and a control cabinet (5), wherein the control cabinet (5) dynamically switches between photovoltaic / commercial power supply through the distribution box (4).

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