Refrigerating and heating display cabinet system utilizing building envelope structure to store heat and control method

Abstract

The invention discloses a refrigerating and heating display cabinet system utilizing a building envelope structure to store heat and a control method. A refrigerating module comprises a compressor, a top heat exchanger set, a standby heat exchanger set, a bottom heat exchanger set, a top temperature sensor set, a bottom temperature sensor set and an electronic expansion valve; the top heat exchanger set and the bottom heat exchanger set are buried in a building top face enclosure structure and a building bottom face enclosure structure respectively, the standby heat exchanger set and the compressor form an outdoor unit, and a display cabinet heat exchanger and a third temperature sensor are arranged in the display cabinet. The compressor is connected with the heat exchanger sets through the connecting pipe set, a switch assembly is arranged on the connecting pipe set, and the switch assembly is controlled by the controller to be turned on and turned off, so that energy is stored when the electricity price is low, and the stored energy is reused when the electricity price is peak. The energy efficiency of the system is improved, the operation cost is reduced, the refrigerating and heating capacity of the display cabinet is improved, thermal pollution is avoided, and the use space of an indoor commercial environment is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment energy storage technology, and in particular to a refrigeration and heating display cabinet system and a control method thereof that utilizes heat storage in a building envelope structure. Background Art

[0002] Heavy building materials like concrete, masonry, and rammed earth, used in building envelopes, have high heat capacity. These materials absorb and release significant amounts of heat when temperatures fluctuate. This is especially true in northern China, where thicker walls offer superior heat storage and are less susceptible to seasonal fluctuations in outdoor air temperature. The waste heat generated by supermarket display cases and freezers is not effectively utilized, but instead becomes a load within the building, leading to a vicious cycle of cooling, heat rejection, and recooling, further increasing overall energy consumption. Furthermore, supermarket refrigeration display cases and freezers are typically located in clusters, causing localized high temperatures and creating heat islands. This can shorten customers' stays in areas with high heat concentrations, impacting both their shopping experience and sales. To address this issue, supermarkets must operate air conditioners and other cooling equipment at high loads for extended periods. This heat island effect further dries out the indoor air, accelerating dust accumulation on air conditioner filters and driving up maintenance costs.

[0003] The main approach to addressing this issue currently involves using multiple cooling units to centrally distribute the generated heat outdoors. However, this wastes heat and exacerbates thermal pollution. Existing cold storage systems take up additional indoor space and only save electricity, not energy. During periods of low electricity prices, demand for cooling or heating display cabinets decreases, so appropriately increasing the internal temperature can help conserve energy. User demand for cooling and heating display cabinets varies significantly from season to season, and a single cooling or heating display cabinet cannot meet these needs. Summary of the Invention

[0004] In order to overcome the above problems existing in the prior art, the present invention proposes a refrigerated and heated display cabinet system that utilizes heat storage in a building envelope.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a refrigerated and heated display cabinet system that utilizes heat storage in a building envelope, comprising a refrigeration module, a controller, and a display cabinet. The refrigeration module comprises a compressor, a top heat exchanger group, a standby heat exchanger group, a bottom heat exchanger group, a first fan, a second fan, a top temperature sensor group, a bottom temperature sensor group, and an electronic expansion valve. The top heat exchanger group is buried in the building's top envelope, the bottom heat exchanger group is buried in the building's bottom envelope, the top temperature sensor group is buried 20 cm from the surface of the building's top envelope, and the bottom temperature sensor group is buried 20 cm from the surface of the bottom envelope. The standby heat exchanger group and the compressor constitute an outdoor unit. The display cabinet heat exchanger and temperature sensor 3 are provided in the display cabinet. The compressor is connected to the top heat exchanger group, the standby heat exchanger group, the bottom heat exchanger group, and the display cabinet heat exchanger through a connecting pipe group, and a switch assembly is provided on the connecting pipe group. The switch assembly is controlled to open and close by a controller according to the temperatures detected by the top temperature sensor group, the bottom temperature sensor group, and the temperature sensor, so as to store energy when electricity prices are low and reuse the stored energy when electricity prices are high.

[0006] In the above-mentioned refrigerated and heated display cabinet system that utilizes heat storage in a building envelope structure, the compressor outlet end connects the top heat exchanger group, the standby heat exchanger group, the bottom heat exchanger group, and the display cabinet heat exchanger in parallel through pipelines, and switch components are provided on the pipelines connected to the top heat exchanger group, the standby heat exchanger group, the bottom heat exchanger group, and the display cabinet heat exchanger.

[0007] In the above-mentioned refrigerated and heated display cabinet system that utilizes heat storage in a building envelope, the number of the top heat exchanger group, the standby heat exchanger group, and the bottom heat exchanger group in the refrigeration module increases or decreases according to the area of ​​the building envelope, and the additional heat exchangers are added to the refrigeration module in parallel.

[0008] In the above-mentioned refrigerated and heated display cabinet system utilizing heat storage in a building envelope, microencapsulated or packaged phase change materials are provided in the building envelope.

[0009] In the above-mentioned refrigerated and heated display cabinet system that utilizes heat storage from a building envelope structure, the switch assembly is a control valve, and the specific pipe connection method is as follows: valves 1 and 13 are respectively provided at the inlet and outlet of the top heat exchanger group, and valves 1 and 13 are used to control the switch of the branch; the other end of valve 1 is connected to the compressor branch, and to ensure flexible conversion between cooling and heating of the system, valves 3, 4, 5, and 6 are installed on the variable frequency compressor end branch; the standby heat exchanger group is controlled by valves 7, 8, and 9, among which valve 8 is used to control the standby heat exchanger main line, and valves 7 and 9 are used to control the heat exchanger branch; the bottom heat exchanger group is controlled by valves 10, 11, and 12, among which the main line is controlled by valve 10, and the branch line is controlled by valves 11 and 12; valves 2, 13, 15, and 16 are used to control the switch of the display cabinet heat exchanger branch.

[0010] A control method for a refrigerated and heated display cabinet system utilizing heat storage in a building envelope is based on the aforementioned refrigerated and heated display cabinet system utilizing heat storage in a building envelope. The method specifically includes: during the cooling season when electricity prices are low, dissipating heat through a bottom heat exchanger group, storing cold air in the top envelope while ensuring that the temperature inside the display cabinet does not exceed a set temperature T1; and dissipating heat through a backup heat exchanger group when the temperature of the bottom envelope exceeds a critical value T2. During the cooling season when electricity prices are high, if the display cabinet temperature is not higher than the set temperature T1, the system will shut down. If the display cabinet temperature is higher than the set temperature T1, and the top enclosure temperature is higher than the set temperature T3, the standby heat exchanger group will dissipate heat to cool the display cabinet. If the top enclosure temperature is lower than the set temperature T3, the cooling capacity stored in the top enclosure will be used to pre-cool the refrigerant before cooling the display cabinet. During the heating season, when electricity prices are low, high-temperature, high-pressure refrigerant heats the display cabinets while storing heat in the bottom enclosure and cold in the top enclosure. When the bottom enclosure temperature is not lower than the set temperature T5 and the display cabinet temperature is not lower than the set temperature T4, the system shuts down. When the top enclosure temperature is lower than the set temperature T6, the cold air is discharged to the outside through the standby heat exchanger group. During the high electricity price period in the heating season, if the display cabinet temperature is not lower than the set temperature T4, the system will shut down; if the display cabinet temperature is lower than the set temperature T4, if the bottom enclosure structure temperature is higher than the set temperature T5, the display cabinet will be heated, and the bottom will be cooled through the bottom heat exchanger group; if the display cabinet temperature is lower than the set temperature T4, if the bottom enclosure structure temperature is lower than the set temperature T5, the display cabinet will be heated, and the cold air will be discharged to the outside through the standby heat exchanger group.

[0011] The present invention has the beneficial effect of effectively solving the indoor thermal pollution problem caused by heat emissions from existing display case refrigeration systems. During the cooling season, the display case refrigeration system of the present invention takes advantage of lower electricity costs at night to store excess cooling energy in the building's top enclosure. During peak hours, this cooling energy is used to cool the display case system, while excess heat is stored in the walls. During the heating season, the heat stored in the walls is used to heat the display case. At night, when electricity costs are lower, excess heat is stored in the building's bottom enclosure, and cooling energy is stored in the walls for use during the cooling season. By replacing the existing forced convection heat exchange method with a heat conduction method, the system reduces the use of fans and lowers system energy consumption. To minimize losses in cold and heat storage, the present invention stores cold energy in the upper enclosure during cold storage, allowing the lost cold energy to be used for radiant cooling of the room. During heat storage, the system stores heat in the lower enclosure, allowing the lost heat to be used for heating the room. This invention effectively solves the current problems of display cabinet temperature storage technology, such as cost reduction without energy savings, extra space occupation, and low energy utilization. It improves system energy efficiency, reduces operating costs, increases display cabinet cooling and heating capabilities, avoids thermal pollution, and increases the usable space in indoor commercial environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the present invention.

[0013] Among them, 1. Thermometer 1, 2. Heat exchanger 1, 3. Valve 1, 4. Valve 2, 5. Fin heat exchanger, 6. Fan 1, 7. Valve 3, 8. Valve 4, 9. Valve 5, 10. Valve 6, 11. Valve 7, 12. Heat exchanger 2, 13. Fan 2, 14. Valve 8, 15. Valve 9, 16. Thermometer 2, 17. Valve 10, 18. Valve 11, 19. Valve 12, 20. Electronic expansion valve, 21. Valve 13, 22. Valve 14, 23. Variable frequency compressor, 24. Controller, 25. Temperature sensor 3, 26. Valve 15, 27. Valve 16, 28. Valve 17, 29. Valve 18, 30. Heat exchanger 3. DETAILED DESCRIPTION

[0014] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] This embodiment discloses a refrigerated and heated display cabinet system that utilizes heat stored in building envelope structures. To effectively reduce the problem of heat accumulation during the use of the display cabinet and prevent the vicious cycle of "cooling-heat exhaust-recooling", the heat and cold energy generated during the operation of the system are utilized for heating and cooling the display cabinet.

[0016] Refrigerated and heated display cabinet systems that utilize thermal storage in building envelopes, such as Figure 1 As shown (the distance or size between each part is exaggerated to show the position of each part, and the schematic diagram is for illustrative purposes only), it mainly includes a refrigeration module, a controller 24, and a display cabinet. The refrigeration module includes a variable frequency compressor 23, a top heat exchanger group, a spare heat exchanger group, a bottom heat exchanger group, a fan 1 6, a fan 2 13, a top temperature sensor group, a bottom temperature sensor group, and an electronic expansion valve 20. The top heat exchanger group is buried in the building top surface enclosure structure, the bottom heat exchanger group is buried in the building bottom surface enclosure structure, the top temperature sensor group is buried 20 cm from the surface of the building top surface enclosure structure, and the bottom temperature sensor group is buried 20 cm from the surface of the bottom surface enclosure structure. The spare heat exchanger group and the compressor group constitute an outdoor unit. The display cabinet heat exchanger and temperature sensor 3 25 are set in the display cabinet.

[0017] The compressor is connected to the top heat exchanger group, the standby heat exchanger group, the bottom heat exchanger group, and the display cabinet heat exchanger through a connecting pipe group, and a control valve is provided on the connecting pipe group. The control valve is controlled to open and close by a controller according to the temperatures detected by the top temperature sensor group, the bottom temperature sensor group, and the temperature sensor, so as to store energy when electricity prices are low and reuse the stored energy when electricity prices are high.

[0018] The top heat exchanger group, the standby heat exchanger group, the bottom heat exchanger group, and the display cabinet heat exchanger are connected in parallel through pipelines at the compressor outlet end, and control valves are provided on the pipelines connected to the top heat exchanger group, the standby heat exchanger group, the bottom heat exchanger group, and the display cabinet heat exchanger.

[0019] The number and area of ​​heat exchangers can be increased or decreased based on the area of ​​the building envelope. Additional heat exchangers are added to the cooling system in parallel. This embodiment uses a single heat exchanger for the top, standby, and bottom heat exchanger groups. The corresponding top and bottom temperature sensor groups are also single sensors. In this embodiment, the top heat exchanger group is heat exchanger 1 2, the standby heat exchanger group is heat exchanger 2 12, and the bottom heat exchanger group is heat exchanger 3 30. The top temperature sensor group is temperature sensor 1 1, and the bottom temperature sensor group is temperature sensor 2 16.

[0020] Furthermore, in this embodiment, to increase the thermal storage capacity of the building envelope, microencapsulated or encapsulated phase change materials are integrated into the building envelope (e.g., gypsum board, concrete, ceiling panels, underfloor). The PCM undergoes a solid-liquid phase transition at a specific temperature, absorbing or releasing a large amount of latent heat. The heat exchanger is embedded within the insulation layer of the building envelope.

[0021] Heat exchanger 1 (2) is embedded in the building's roof enclosure, used to extract and release heat from the structure. The inlet and outlet of heat exchanger 1 (2) are connected to valve 1 (3) and valve 13 (21), which control the opening and closing of this branch. Temperature sensor 1 (1) and temperature sensor 2 (16) are embedded 20 cm from the ceiling and floor surfaces, respectively, to detect the temperature at these locations and transmit the data in real time to processor 24. This prevents the ceiling from overheating or underheating due to heat stored in the enclosure, potentially causing discomfort to occupants. The other end of valve 1 (3) is connected to the variable frequency compressor (23) branch. To ensure flexible switching between cooling and heating, this branch is equipped with valves 3 (7), 4 (8), 5 (9), and 6 (10). Heat exchanger 2 (12) is controlled by valves 7 (11), 8 (14), 9 (15), 17 (28), and 18 (29). Valve 8 (14) controls the main circuit of heat exchanger 2 (12), while valves 7 (11), 9 (15), 17 (28), and 18 (29) control its branch circuits. Fan 2 (13) provides forced convection heat transfer for heat exchanger 2 (12). Heat exchanger 2 (12) and variable frequency compressor 23 form the outdoor unit, with heat exchanger 2 (12) serving as a backup to prevent excessive temperature fluctuations in the surrounding structure. Heat exchanger 3 (30) is controlled by valves 10 (17), 11 (18), and 12 (19). The main circuit is controlled by valve 10 (17), while the branch circuits are controlled by valves 11 (18) and 12 (19). Valve 2 (4), valve 13 (21), valve 15 (26), and valve 16 (27) control the branch circuit of fin heat exchanger 5 in the display cabinet.

[0022] Based on the above-mentioned refrigerated and heated display cabinet system that utilizes heat stored in the building envelope structure, this embodiment also discloses a control method. By controlling the opening and closing of each valve, the display cabinet refrigeration system of the present invention is realized in the cooling season. Taking advantage of the low electricity cost at night, the excess cold is stored in the building's top envelope structure, and the cold is utilized during peak electricity consumption hours for cooling the display cabinet system, and the excess heat is stored in the wall. In the heating season, the heat stored in the wall is utilized for heating the display cabinet. At night when the electricity cost is low, the excess heat is stored in the building's bottom envelope structure, and the cold is stored in the wall for use in the cooling season. Specifically: During the period of low electricity price in the cooling season, the temperature in the display cabinet is lower than T1, the temperature of the bottom enclosure structure is lower than T2, and the temperature of the top enclosure structure is higher than T3. At this time, the refrigerant returns from the compressor outlet through the bottom heat exchanger group, the electronic expansion valve, and the top heat exchanger group to the compressor inlet end; when the temperature in the display cabinet is not lower than T1, the temperature of the bottom enclosure structure is lower than T2, and the temperature of the top enclosure structure is higher than T3, the refrigerant is divided into two paths, one path is from the compressor outlet through the bottom heat exchanger group, the electronic expansion valve, and the top heat exchanger group to the compressor inlet end, and the other path is from the compressor outlet through the bottom heat exchanger group, the electronic expansion valve, and the display cabinet heat exchanger to the compressor inlet end; when the temperature in the display cabinet is lower than T1, the temperature of the bottom enclosure structure is higher than T2, and the temperature of the top enclosure structure is higher than T3 At T3, the refrigerant returns from the compressor outlet through the standby heat exchanger group, the electronic expansion valve, and the top heat exchanger group to the compressor inlet; when the temperature inside the display cabinet is lower than T1, the bottom enclosure temperature is not higher than T2, and the top enclosure temperature is lower than T3, the system shuts down; when the temperature inside the display cabinet is higher than T1, the bottom enclosure temperature is higher than T2, and the top enclosure temperature is lower than T3, the refrigerant returns from the compressor outlet through the standby heat exchanger group, the electronic expansion valve, and the display cabinet heat exchanger to the compressor inlet; when the temperature inside the display cabinet is higher than T1, the bottom enclosure temperature is lower than T2, and the top enclosure temperature is lower than T3, the refrigerant returns from the compressor outlet through the bottom heat exchanger group, the electronic expansion valve, and the display cabinet heat exchanger to the compressor inlet; During the high electricity price stage during the cooling season, when the display cabinet temperature is higher than T1 and the top enclosure structure temperature is higher than T3, the refrigerant will flow from the compressor outlet through the standby heat exchanger, electronic expansion valve, and display cabinet heat exchanger back to the compressor inlet; when the display cabinet temperature is higher than T1 and the top enclosure structure temperature is lower than T3, the refrigerant will flow from the compressor outlet through the top heat exchanger group, electronic expansion valve, and display cabinet heat exchanger back to the compressor inlet; when the display cabinet temperature is lower than T1, the system will shut down. During the low electricity price stage of the heating season, when the display cabinet temperature is lower than T4, the bottom enclosure temperature is lower than T5, and the top enclosure temperature is higher than T6, the refrigerant will be returned from the compressor outlet through the display cabinet heat exchanger, the bottom heat exchanger group, the electronic expansion valve, and the top heat exchanger group to the compressor inlet; when the display cabinet temperature is higher than T4, the bottom enclosure temperature is lower than T5, and the top enclosure temperature is higher than T6, the refrigerant will be returned from the compressor outlet through the ground heat exchanger group, the electronic expansion valve, and the top heat exchanger group to the compressor inlet; when the display cabinet temperature is lower than T4, the bottom enclosure temperature is higher than T5, and the top enclosure temperature is higher than T6, the refrigerant will be returned from the compressor outlet through the display cabinet heat exchanger, the electronic expansion valve, and the top heat exchanger group to the compressor inlet; when the display cabinet temperature is lower than T4 , the bottom enclosure temperature is lower than T5, and the top enclosure temperature is lower than T6. At this time, the refrigerant returns from the compressor outlet end through the display cabinet heat exchanger, the bottom heat exchanger group, the electronic expansion valve, and the spare heat exchanger group to the compressor inlet end; when the display cabinet temperature is lower than T4, the bottom enclosure temperature is higher than T5, and the top enclosure temperature is lower than T6, the refrigerant returns from the compressor outlet end through the display cabinet heat exchanger, the electronic expansion valve, and the spare heat exchanger group to the compressor inlet end; when the display cabinet temperature is higher than T4 and the bottom enclosure temperature is higher than T5, the system shuts down; when the display cabinet temperature is higher than T4, the bottom enclosure temperature is lower than T5, and the top enclosure temperature is lower than T6, the refrigerant returns from the compressor outlet end through the bottom heat exchanger group, the electronic expansion valve, and the spare heat exchanger group to the compressor inlet end; During the high electricity price period in the heating season, when the display cabinet temperature is lower than T4 and the bottom enclosure structure temperature is higher than T5, the refrigerant will return to the compressor inlet through the display cabinet heat exchanger, electronic expansion valve, and bottom heat exchanger group via the compressor outlet; when the display cabinet temperature is lower than T4 and the bottom enclosure structure temperature is higher than T5, the refrigerant will return to the compressor inlet through the display cabinet heat exchanger, electronic expansion valve, and standby heat exchanger group via the compressor outlet; when the display cabinet temperature is higher than T4, the system will shut down.

[0023] In this embodiment, T1 is 5°C, T2 is 25°C, T3 is 10°C, T4 is 45°C, T5 is 40°C, and T6 is 14°C.

[0024] In this embodiment, at different temperatures, the specific flow direction of the refrigerant is: Low electricity price stage during the cooling season: a. Initially, the temperature inside the box is lower than 5°C, the bottom temperature is lower than 28°C, and the top temperature is higher than 10°C Compressor outlet - valve five 9 - valve eight 14 - valve eleven 18 - heat exchanger three 30 - valve twelve 19 - electronic expansion valve 20 - valve thirteen 21 - heat exchanger one 2 - valve one 3 - valve three 7 - compressor inlet.

[0025] b When the temperature inside the cabinet rises to 5°C, the bottom temperature is lower than 28°C and the top temperature is higher than 10°C Two branches: one is the compressor outlet end - valve five 9 - valve eight 14 - valve eleven 18 - heat exchanger three 30 - valve twelve 19 - electronic expansion valve 20 - valve thirteen 21 - heat exchanger one 2 - valve one 3 - valve three 7 - compressor air inlet end; the other branch is the compressor outlet end - valve five 9 - valve eight 14 - valve eleven 18 - heat exchanger three 30 - valve twelve 19 - electronic expansion valve 20 - valve fourteen 22 - fin heat exchanger 5 - valve two 4 - valve three 7 - compressor air inlet end.

[0026] c The bottom enclosure rises to 28°C, the temperature inside the cabinet is lower than 5°C, and the top temperature is higher than 10°C Compressor outlet - valve five 9 - valve seven 11 - heat exchanger two 12 - valve nine 15 - valve ten 17 - electronic expansion valve 20 - valve thirteen 21 - heat exchanger one 2 - valve one 3 - valve three 7 - compressor inlet.

[0027] d. The bottom enclosure rises to 28°C, the temperature inside the cabinet is lower than 5°C, and the top surface temperature is lower than 10°C. System down.

[0028] E The bottom enclosure rises to 28°C, the temperature inside the cabinet is higher than 5°C, and the top surface temperature is lower than 10°C Compressor outlet - valve five 9 - valve seven 11 - heat exchanger two 12 - valve nine 15 - valve ten 17 - electronic expansion valve 20 - valve fourteen 22 - fin heat exchanger 5 - valve two 4 - valve three 7 - compressor inlet.

[0029] F The bottom enclosure structure is lower than 28℃, the temperature inside the cabinet is higher than 5℃, and the top surface temperature is lower than 10℃ Compressor outlet - valve five 9 - valve eight 14 - valve eleven 18 - heat exchanger three 30 - valve twelve 19 - electronic expansion valve 20 - valve fourteen 22 - fin heat exchanger 5 - valve two 4 - valve three 7 - compressor inlet.

[0030] G The bottom enclosure structure is lower than 28℃, the temperature inside the cabinet is lower than 5℃, and the top surface temperature is lower than 10℃ System down.

[0031] H The bottom enclosure structure is higher than 28℃, the temperature inside the cabinet is higher than 5℃, and the top surface temperature is higher than 10℃ There are two branches, one is the compressor outlet end - valve five 9 - valve seven 11 - heat exchanger two 12 - valve nine 15 - valve ten 17 - electronic expansion valve 20 - valve thirteen 21 - heat exchanger one 2 - valve one 3 - valve three 7 - compressor air inlet end; the other is the compressor outlet end - valve five 9 - valve seven 11 - heat exchanger two 12 - valve nine 15 - valve ten 17 - electronic expansion valve 20 - valve fourteen 22 - fin heat exchanger 5 - valve two 4 - valve three 7 - compressor air inlet end.

[0032] 2. High electricity prices during the cooling season: a. The temperature inside the box is higher than 5℃ and the top surface temperature is higher than 28℃ Compressor outlet - valve five 9 - valve seven 11 - heat exchanger two 12 - valve nine 15 - valve ten 17 - electronic expansion valve 20 - valve fourteen 22 - fin heat exchanger 5 - valve two 4 - valve three 7 - compressor inlet.

[0033] b. The temperature inside the box is higher than 5℃ and the top surface temperature is lower than 28℃ Compressor outlet - valve six 10 - valve one 3 - heat exchanger one 2 - valve thirteen 21 - electronic expansion valve 20 - valve ten 17 - valve fifteen 26 - fin heat exchanger 5 - valve sixteen 27 - valve four 8 - compressor inlet.

[0034] C. The temperature inside the box is lower than 5℃ System down.

[0035] 3. Low electricity prices during the heating season: a. The temperature inside the box is lower than 45℃, the bottom temperature is lower than 40℃, and the top temperature is higher than 14℃ Compressor outlet - valve five 9 - valve sixteen 27 - fin heat exchanger 5 - valve fifteen 26 - valve eleven 18 - heat exchanger three 30 - valve twelve 19 - electronic expansion valve 20 - valve thirteen 21 - heat exchanger one 2 - valve one 3 - valve three 7 - compressor outlet.

[0036] b. When the temperature inside the box is higher than 45℃, the bottom temperature is lower than 40℃ and the top temperature is higher than 14℃ Compressor outlet - valve five 9 - valve eight 14 - valve eleven 18 - heat exchanger three 30 - valve twelve 19 - electronic expansion valve 20 - valve thirteen 21 - heat exchanger one 2 - valve one 3 - valve three 7 - compressor outlet.

[0037] C. When the temperature inside the box is lower than 45℃, the bottom temperature is higher than 40℃ and the top temperature is higher than 14℃ Compressor outlet end - valve five 9 - valve sixteen 27 - fin heat exchanger 5 - valve fifteen 26 - valve ten 17 - electronic expansion valve 20 - valve thirteen 21 - heat exchanger one 2 - valve one 3 - valve three 7 - compressor outlet end.

[0038] D. When the temperature inside the box is lower than 45℃, the bottom temperature is lower than 40℃ and the top temperature is lower than 14℃ Compressor outlet end - valve five 9 - valve sixteen 27 - fin heat exchanger 5 - valve fifteen 26 - valve eleven 18 - heat exchanger three 30 - valve twelve 19 - electronic expansion valve 20 - valve seventeen 28 - heat exchanger two 12 - valve eighteen 29 - valve three 7 - compressor outlet end.

[0039] E. When the temperature inside the box is lower than 45℃, the bottom temperature is higher than 40℃ and the top temperature is lower than 14℃ Compressor outlet end - valve five 9 - valve sixteen 27 - fin heat exchanger 5 - valve fifteen 26 - valve ten 17 - electronic expansion valve 20 - valve seventeen 28 - heat exchanger two 12 - valve eighteen 29 - valve three 7 - compressor outlet end.

[0040] F. When the temperature inside the box is higher than 45℃, the bottom temperature is higher than 40℃ and the top temperature is lower than 14℃ System down.

[0041] G. When the temperature inside the box is higher than 45℃, the bottom temperature is higher than 40℃ and the top temperature is higher than 14℃ System down.

[0042] H. When the temperature inside the box is higher than 45℃, the bottom temperature is lower than 40℃ and the top temperature is lower than 14℃ Compressor outlet - valve five 9 - valve eight 14 - valve eleven 18 - heat exchanger three 30 - valve twelve 19 - electronic expansion valve 20 - valve seventeen 28 - heat exchanger two 12 - valve eighteen 29 - valve three 7 - compressor outlet.

[0043] 4. High electricity prices during the heating season: a. The temperature inside the box is lower than 45℃ and the bottom temperature is higher than 40℃ Compressor outlet - valve six 10 - valve two 4 - fin heat exchanger 5 - valve fourteen 22 - electronic expansion valve 20 - valve twelve 19 - heat exchanger three 30 - valve eleven 18 - valve eight 14 - valve four 8 - compressor inlet.

[0044] b. The temperature inside the box is lower than 45℃ and the bottom temperature is lower than 40℃ Compressor outlet - valve six 10 - valve two 4 - fin heat exchanger 5 - valve fourteen 22 - electronic expansion valve 20 - valve ten 17 - valve nine 15 - heat exchanger two 12 - valve seven 11 - valve four 8 - compressor inlet.

[0045] C. The temperature inside the box is higher than 45℃ System down.

[0046] Through the above method, during the cooling season, the display cabinet refrigeration system of the present invention takes advantage of the low cost of electricity at night and stores excess cold in the building's top enclosure. During peak electricity consumption hours, the cold is used to cool the display cabinet system, and excess heat is stored in the wall. During the heating season, the heat stored in the wall is used to heat the display cabinet. At night when electricity costs are low, excess heat is stored in the building's bottom enclosure, and cold is stored in the wall for use in the cooling season. This improves system energy efficiency, reduces operating costs, increases the display cabinet's cooling and heating capabilities, avoids thermal pollution, and increases the usable space of indoor commercial environments.

[0047] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the spirit and scope of protection of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present invention.

Claims

1. A refrigerated and heated display cabinet system utilizing heat storage in building envelope structures, characterized in that: It includes a refrigeration module, a controller, and a display cabinet. The refrigeration module includes a compressor, a top heat exchanger group, a standby heat exchanger group, a bottom heat exchanger group, a fan 1, a fan 2, a top temperature sensor group, a bottom temperature sensor group, and an electronic expansion valve. The top heat exchanger group is buried in the building's top enclosure structure, the bottom heat exchanger group is buried in the building's bottom enclosure structure, the top temperature sensor group is buried 20 cm from the building's top enclosure structure surface, the bottom temperature sensor group is buried 20 cm from the bottom enclosure structure surface, the standby heat exchanger group and the compressor form an outdoor unit, and the display cabinet heat exchanger and temperature sensor 3 are set in the display cabinet. The compressor is connected to the top heat exchanger group, the standby heat exchanger group, the bottom heat exchanger group, and the display cabinet heat exchanger through a connecting pipe group, and a switch assembly is provided on the connecting pipe group. The switch assembly is controlled to open and close by a controller according to the temperatures detected by the top temperature sensor group, the bottom temperature sensor group, and the temperature sensor, so as to store energy when electricity prices are low and reuse the stored energy when electricity prices are high.

2. The refrigerated and heated display cabinet system utilizing heat storage in building envelopes according to claim 1, characterized in that: The compressor outlet end connects the top heat exchanger group, the standby heat exchanger group, the bottom heat exchanger group, and the display cabinet heat exchanger in parallel through pipelines, and switch components are provided on the pipelines connected to the top heat exchanger group, the standby heat exchanger group, the bottom heat exchanger group, and the display cabinet heat exchanger.

3. The refrigerated and heated display cabinet system utilizing heat storage in building envelopes according to claim 1, characterized in that: The number of the top heat exchanger group, the standby heat exchanger group, and the bottom heat exchanger group in the refrigeration module increases or decreases according to the area of ​​the building envelope structure, and the additional heat exchangers are added to the refrigeration module in parallel.

4. The refrigerated and heated display cabinet system utilizing heat storage in building envelopes according to claim 1, characterized in that: The building enclosure structure is provided with microencapsulated or packaged phase change material.

5. The refrigerated and heated display cabinet system utilizing heat storage in building envelopes according to claim 2, characterized in that: The switch assembly is a control valve, and the specific pipeline connection method is as follows: valve one and valve thirteen are respectively provided at the inlet and outlet of the top heat exchanger group, and valves one and thirteen are used to control the switch of the branch; the other end of valve one is connected to the compressor branch. In order to ensure the flexible conversion of cooling and heating of the system, valves three, four, five and six are installed on the branch at the variable frequency compressor end; the standby heat exchanger group is controlled by valves seven, eight and nine, among which valve eight is used to control the standby heat exchanger main line, and valves seven and nine are used to control the heat exchanger branch; the bottom heat exchanger group is controlled by valves ten, eleven and twelve, among which the main line is controlled by valve ten, and the branch line is controlled by valves eleven and twelve; valves two, thirteen, fifteen and sixteen are used to control the switch of the display cabinet heat exchanger branch.

6. A control method for a refrigerated and heated display cabinet system utilizing heat storage in a building envelope, characterized in that: A refrigerated and heated display cabinet system utilizing heat storage in a building envelope structure according to any one of claims 1 to 5, specifically comprising: during the cooling season when electricity prices are low, heat is dissipated through a bottom heat exchanger group, storing cold in the top envelope structure while ensuring that the temperature inside the display cabinet does not exceed a set temperature T1; when the temperature of the bottom envelope structure exceeds a critical value T2, heat is dissipated through a standby heat exchanger group; During the cooling season when electricity prices are high, if the display cabinet temperature is not higher than the set temperature T1, the system will shut down. If the display cabinet temperature is higher than the set temperature T1, and the top enclosure temperature is higher than the set temperature T3, the standby heat exchanger group will dissipate heat to cool the display cabinet. If the top enclosure temperature is lower than the set temperature T3, the cooling capacity stored in the top enclosure will be used to pre-cool the refrigerant before cooling the display cabinet. During the heating season, when electricity prices are low, high-temperature, high-pressure refrigerant heats the display cabinets while storing heat in the bottom enclosure and cold in the top enclosure. When the bottom enclosure temperature is not lower than the set temperature T5 and the display cabinet temperature is not lower than the set temperature T4, the system shuts down. When the top enclosure temperature is lower than the set temperature T6, the cold air is discharged to the outside through the standby heat exchanger group. During the high electricity price period in the heating season, if the display cabinet temperature is not lower than the set temperature T4, the system will shut down; if the display cabinet temperature is lower than the set temperature T4, if the bottom enclosure structure temperature is higher than the set temperature T5, the display cabinet will be heated, and the bottom will be cooled through the bottom heat exchanger group; if the display cabinet temperature is lower than the set temperature T4, if the bottom enclosure structure temperature is lower than the set temperature T5, the display cabinet will be heated, and the cold air will be discharged to the outside through the standby heat exchanger group.

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