Vertical geothermal ventilation and phase change energy storage floor fresh air coupling system

Abstract

The invention discloses a vertical terrestrial heat ventilation and phase change energy storage floor fresh air coupling system, and belongs to the technical field of phase change material heat storage and building ventilation. The vertical terrestrial heat ventilation and phase change energy storage floor fresh air coupling system comprises a room body and a fresh air preheating system; the end, close to the fresh air preheating system, of the fresh air channel is arranged on the bottom side in the room body, the other end of the fresh air channel is arranged on the upper side, away from the fresh air preheating system, of the wall body in the room body, an inner interlayer is arranged on the bottom side in the room body, a phase change energy storage module is arranged in the top side of the room body, and a capillary hot water pipe network is arranged between the phase change energy storage module and the inner interlayer. An exhaust system is arranged at the end, close to the fresh air preheating system, of the inner interlayer, one end of the exhaust system is located on the upper surface of the inner interlayer, the other end of the exhaust system penetrates through the room body and is located on the outer side of the room body, and the fresh air channel, the capillary hot water pipe network and the exhaust system are further connected with an automatic control system. According to the invention, vertical sleeve geothermal ventilation and energy-saving regulation and control of a building thermal environment are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of phase change material heat storage and building ventilation, and in particular to a vertical geothermal ventilation and phase change energy storage floor fresh air coupling system. Background Art

[0002] At present, the combination of phase change energy storage structures and buildings has become an important technical path to reduce building energy consumption. The application of phase change materials in the field of building energy conservation is mainly reflected in two aspects: on the one hand, passive energy conservation, that is, making full use of natural cold and heat sources, such as solar energy, geothermal energy, etc.; on the other hand, active energy conservation, using active cold and heat sources to store energy, and through the method of "peak shaving and valley filling", to achieve efficient energy utilization. In recent years, many researchers have proposed an integrated solution combining phase change energy storage with floor heating systems. This system can significantly reduce the energy consumption of building operation while ensuring indoor thermal comfort. However, the existing energy storage heating floor system still has problems such as long charging and discharging time, high construction cost and lack of fresh air system, which limits its widespread promotion and application in actual projects.

[0003] There are many patents applied for phase change energy storage floors in existing research, such as a phase change heat storage floor structure (authorization number CN 208518269 U), which effectively reduces the start-up time of floor radiant heating by combining phase change materials with traditional floors, thereby achieving the purpose of energy saving and electricity peak shifting. Problems with this patent include the fact that the system does not take into account the introduction of fresh air, which leads to poor indoor air quality when the system is running for a long time. In addition, the heat storage layer and the floor heating pipes are arranged up and down. When the system starts, the heat of the floor heating pipes needs to heat the concrete layer, heat storage layer, leveling layer and finishing layer in turn, which inevitably leads to the problem of slow hot start of the system. Patent CN204227609U staggers the phase change energy storage material and the water supply pipe, which also has the problem of slow hot start and difficulty in quickly charging the energy storage material. Although patents CN105066217A, CN102677860A, and CN205897302U wrap the heating branch pipes in heat storage materials to avoid the problem of slow hot start, the system has no fresh air structure and still has the problem of deterioration of indoor air quality during long-term operation. Summary of the Invention

[0004] The purpose of the present invention is to provide a vertical geothermal ventilation and phase change energy storage floor fresh air coupling system. Through the integrated innovation of multiple technologies such as phase change energy storage modules, exhaust heat recovery and channel fresh air, vertical casing geothermal ventilation and energy-saving regulation of the building thermal environment are realized, providing a feasible solution for efficient, low-carbon and comfortable green building systems.

[0005] To achieve the above-mentioned objectives, the present invention provides a vertical geothermal ventilation and phase change energy storage floor fresh air coupling system, comprising a room body and a fresh air preheating system, wherein one end of the fresh air preheating system absorbs outside air, and the other end passes through the room body and is connected to one end of the fresh air duct, an end of the fresh air duct close to the fresh air preheating system is arranged on the bottom side of the room body, and the other end is arranged on the upper side of the wall of the room body away from the fresh air preheating system, an internal interlayer is also provided on the bottom side of the room body, a phase change energy storage module is provided on the internal top of the internal interlayer, a capillary hot water pipe network is provided between the upper side of the phase change energy storage module and the internal interlayer, an exhaust system is provided on the end of the internal interlayer close to the fresh air preheating system, one end of the exhaust system is located on the upper surface of the internal interlayer, and the other end passes through the internal interlayer, the fresh air duct and the room body and is located outside the room body, the fresh air duct, the capillary hot water pipe network and the exhaust system are also connected to an automatic control system.

[0006] Preferably, the room includes walls, floor slabs and a roof. The floor slabs are located above the ground. There are four walls located around the upper side of the floor slabs. A cavity is provided in the wall away from the fresh air preheating system. The roof is provided above the four walls.

[0007] Preferably, the fresh air preheating system includes an outer pipe and an inner pipe. External air enters the fresh air preheating system through one end of the outer pipe, and a filter is provided at this end. The other end of the outer pipe extends vertically into the ground. One end of the inner pipe passes through the outer pipe and extends vertically into the ground together with the outer pipe, and the other end passes through a wall close to the fresh air preheating system and is connected to the fresh air channel. Both the outer pipe and the inner pipe are made of stainless steel, and a 50mm thick polyurethane insulation pipe is provided on the outside of the inner pipe.

[0008] Preferably, the fresh air channel includes a ventilation tunnel, a fresh air fan and automatically adjustable louvers. The ventilation tunnel is located between the four walls above the floor slab. A fresh air inlet connected to the inner pipe is provided at one end of the ventilation tunnel close to the fresh air preheating system, and the other end away from the fresh air preheating system is connected to one end of the cavity in the wall. The other end of the cavity in the wall is connected to the fresh air fan through the fresh air outlet, and the automatically adjustable louvers are connected to the fresh air fan through the inner wall.

[0009] Preferably, the internal interlayer includes a support column structure, a polyester insulation layer and a surface floor. The polyester insulation layer is located above the ventilation tunnel. There are several support column structures, and each support column structure includes a pillar and a frame column. One end of the pillar is fixed to the upper side of the floor, and the other end is connected to the lower side of the polyester insulation layer to support the polyester insulation layer. One end of the frame column is connected to the upper side of the polyester insulation layer, and the other end is connected to the surface floor to support the surface floor.

[0010] Preferably, there are several phase change energy storage modules, each of which is embedded in the upper surface of the frame and connected to the lower surface of the surface floor. The phase change energy storage modules are connected to each other. The phase change energy storage modules include positioning protrusions, capillary network grooves, positioning recesses, metal containers and fins. There are two positioning protrusions and two positioning recesses, and one positioning protrusion and one positioning recess are symmetrically arranged on both sides of the metal container. The capillary network groove is located on the upper surface of the metal container, and the upper surface of the metal container is also connected to the surface floor. There are several fins, which are evenly arranged around the metal container. The interior of the metal container is filled with phase change energy storage filler.

[0011] Preferably, the diameter of the capillary hot water pipe network is slightly smaller than the capillary network groove, and includes a water distributor, a water supply branch, a return branch and a water collector. One end of the water distributor is connected to one end of the water supply main, and the other end of the water supply main is connected to the water supply port of the hot water source. The other end of the water distributor is connected to the water supply branch, and one end of the return branch is connected to the end of the water supply branch away from the water distributor. The other end of the return branch is connected to the water collector. The water collector is also connected to one end of the return main, and the other end of the return main is connected to the return port of the hot water source. The water supply main, water supply branch, return branch and return main are all arranged in the capillary network groove.

[0012] Preferably, the exhaust system includes an exhaust fan, an exhaust duct, a heat exchange fin tube and an exhaust duct outlet. The exhaust fan is arranged on the side of the surface floor close to the fresh air inlet, and the air inlet of the exhaust fan is located on the surface of the surface floor. The indoor exhaust outlet of the exhaust fan is connected to the exhaust duct, and a filter is provided at the connection point. The exhaust duct is surrounded and embedded in the ventilation tunnel, and the heat exchange fin tube is arranged on the outside of the exhaust duct. The exhaust duct outlet is arranged at the end of the exhaust duct away from the exhaust fan, and passes through the wall to be located outdoors.

[0013] Preferably, the automatic control system includes an indoor fresh air volume control system and a circulating hot water temperature control system. The air volume of the fresh air channel is regulated by the indoor fresh air volume control system. The indoor fresh air volume control system includes a multi-speed manual switch, an air outlet wind speed sensor, an electric air valve and a fan control system. The air outlet wind speed sensor and the electric air valve are both arranged at the fresh air inlet. The fan control system is connected to the fresh air fan and the exhaust fan. The multi-speed manual switch receives the signal from the air outlet wind speed sensor and sends a signal to the electric air valve and the fan control system at the same time to control the air intake and exhaust of the system.

[0014] Preferably, the circulating hot water temperature control system includes an indoor temperature sensor, a circulating hot water temperature sensor and a heat pump start controller. There are several indoor temperature sensors, which are installed inside the room. The circulating hot water temperature sensor is set in the capillary hot water pipe network, and the heat pump start controller is set at the hot water source.

[0015] Therefore, the present invention adopts a vertical geothermal ventilation and phase change energy storage floor fresh air coupling system with the above structure, which has the following advantages:

[0016] 1. Through the vertical casing buried underground (the underground part of the outer and inner pipes) of the fresh air preheating system, the air is pre-cooled or preheated before entering the room, which can significantly reduce the air conditioning load and improve the energy efficiency of the building;

[0017] 2. It has the characteristics of intermittent operation, which can store energy during off-peak hours and release heat / cold during peak hours, forming a good dynamic coupling with the heat storage and release process of the phase change material, realizing the energy-saving operation mode of "peak shaving and valley filling";

[0018] 3. The support column structure is used to support the fresh air channel, and the exhaust waste heat is used to preheat the fresh air. This not only effectively recovers the indoor waste heat, but also solves the problem of inaccurate household metering in traditional floor heating systems;

[0019] 4. By setting up an exhaust system, the exhaust heat is used to perform secondary heating on the fresh air, which reduces the energy burden required to introduce external fresh air. While ensuring the indoor air quality, it further improves the overall energy efficiency of the system;

[0020] 5. The modular phase change energy storage unit is used to facilitate prefabrication and on-site integration, reducing the complexity and cost of decoration construction;

[0021] 6. The system adopts a channel-type fresh air supply method to replace the traditional central air conditioning fresh air system, which not only ensures the circulation of fresh air, but also effectively reduces the system energy consumption;

[0022] 7. Radiant heating is used for heating. Compared with traditional radiator systems, it has lower requirements for indoor temperature control, higher energy efficiency, and significantly improves indoor thermal comfort.

[0023] 8. By using an automatic control system to control heating and hot air circulation, on the basis of maintaining a comfortable indoor thermal environment, the system's peak-shifting operation is achieved through the reasonable connection of phase change heat storage and heat release, thus saving a lot of electricity bills.

[0024] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a side sectional view of a vertical geothermal ventilation and phase change energy storage floor fresh air coupling system of the present invention;

[0026] Figure 2 This is a diagram of the indoor portion of a vertical geothermal ventilation and phase-change energy storage floor fresh air coupling system of the present invention;

[0027] Figure 3 This is a capillary hot water pipe network diagram of a vertical geothermal ventilation and phase change energy storage floor fresh air coupling system of the present invention;

[0028] Figure 4 This is a relationship diagram between the exhaust system and the fresh air channel of a vertical geothermal ventilation and phase change energy storage floor fresh air coupling system of the present invention;

[0029] Figure 5 This is an exhaust system diagram of a vertical geothermal ventilation and phase change energy storage floor fresh air coupling system of the present invention;

[0030] Figure 6 This is a phase change energy storage module diagram of a vertical geothermal ventilation and phase change energy storage floor fresh air coupling system of the present invention;

[0031] Figure 7 This is a working diagram of an automatic control system for a vertical geothermal ventilation and phase change energy storage floor fresh air coupling system of the present invention;

[0032] Reference numerals

[0033] 1. Room structure; 11. Walls; 12. Floor slabs; 13. Roof; 14. Wall cavity; 2. Fresh air preheating system; 21. External pipe; 22. Internal pipe; 23. Filter; 3. Fresh air duct; 31. Ventilation tunnel; 32. Fresh air fan; 33. Automatically adjustable shutters; 34. Fresh air inlet; 35. Fresh air outlet; 4. Internal mezzanine; 41. Support column structure; 411. Support column; 412. Column; 42. Polyester insulation layer; 43. Surface floor; 5. Variable energy storage module; 51. Positioning protrusion; 52. Capillary network groove; 53. Positioning concave block; 54. Metal container; 55. Fin; 56. Phase change energy storage filler; 6. Capillary hot water network; 61. Water distributor; 62. Water supply branch; 63. Return branch; 64. Water collector; 65. Water supply main; 66. Return main; 7. Exhaust system; 71. Exhaust fan; 72. Exhaust duct; 73. Heat exchange fin tube; 74. Exhaust duct outlet; 75. Filter. DETAILED DESCRIPTION

[0034] Example

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0038] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0039] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. The following embodiments and features in the embodiments can be combined with each other unless there is a conflict.

[0040] like Figure 1-Figure 7 As shown, the present invention provides a vertical geothermal ventilation and phase change energy storage floor fresh air coupling system, including a room 1 and a fresh air preheating system 2, one end of the fresh air preheating system 2 absorbs outside air, and the other end passes through the room 1 and is connected to one end of the fresh air duct 3, the end of the fresh air duct 3 close to the fresh air preheating system 2 is arranged on the bottom side of the room 1, and the other end is arranged on the upper side of the wall 11 inside the room 1 away from the fresh air preheating system 2, an internal interlayer 4 is further provided on the bottom side of the room 1, a phase change energy storage module 5 is provided on the top of the internal interlayer 4, a capillary hot water pipe network 6 is provided between the upper side of the phase change energy storage module 5 and the internal interlayer 4, an exhaust system 7 is provided at the end of the internal interlayer 4 close to the fresh air preheating system 2, one end of the exhaust system 7 is located on the upper surface of the internal interlayer 4, and the other end passes through the internal interlayer 4, the fresh air duct 3 and the room 1 and is located outside the room 1, the fresh air duct 3, the capillary hot water pipe network 6 and the exhaust system 7 are also connected to an automatic control system.

[0041] The room 1 includes walls 11, floor 12 and roof 13. The floor 12 is located above the ground. There are four walls 11, which are located around the upper side of the floor 12. A cavity 14 is provided in the wall 11 away from the fresh air preheating system 2. The roof 13 is provided above the four walls 11.

[0042] The fresh air preheating system 2 includes an outer pipe 21 and an inner pipe 22. External air enters the fresh air preheating system 2 through one end of the outer pipe 21, and a filter screen 23 is provided at this end. The other end of the outer pipe 21 extends vertically into the ground. One end of the inner pipe 22 passes through the outer pipe 21 and extends vertically into the ground together with the outer pipe 21, and the other end passes through a wall 11 close to the fresh air preheating system 2 and is connected to the fresh air duct 3. Both the outer pipe 21 and the inner pipe 22 are made of stainless steel, and a 50mm thick polyurethane insulation pipe is provided on the outside of the inner pipe 22.

[0043] The fresh air duct 3 includes a ventilation tunnel 31, a fresh air fan 32 and automatically adjustable shutters 33. The ventilation tunnel 31 is located between the four walls 11 above the floor 12. A fresh air inlet 34 connected to the inner pipe 22 is provided at one end of the ventilation tunnel 31 close to the fresh air preheating system 2, and the other end away from the fresh air preheating system 2 is connected to one end of the cavity 14 in the wall. The other end of the cavity 14 in the wall is connected to the fresh air fan 32 through the fresh air outlet 35. The automatically adjustable shutters 33 pass through the inner wall 11 and are connected to the fresh air fan 32.

[0044] The internal interlayer 4 includes a support column structure 41, a polyester insulation layer 42 and a surface floor 43. The polyester insulation layer 42 is located above the ventilation tunnel 31. There are several support column structures 41. Each support column structure 41 includes a pillar 411 and a frame column 412. One end of the pillar 411 is fixed on the upper side of the floor 12, and the other end is connected to the lower side of the polyester insulation layer 42 to support the polyester insulation layer 42. One end of the frame column 412 is connected to the upper side of the polyester insulation layer 42, and the other end is connected to the surface floor 43 to support the surface floor 43.

[0045] There are several phase change energy storage modules 5, each of which is embedded in the upper surface of the frame column 412 and connected to the lower surface of the surface floor 43. The phase change energy storage modules 5 are connected to each other. The phase change energy storage module 5 includes a positioning protrusion 51, a capillary network groove 52, a positioning recess 53, a metal container 54 and a fin 55. There are two positioning protrusions 51 and two positioning recesses 53, and one positioning protrusion 51 and one positioning recess 53 are symmetrically arranged on both sides of the metal container 54. The capillary network groove 52 is located on the upper surface of the metal container 54. The upper surface of the metal container 54 is also connected to the surface floor 43. There are several fins 55, which are evenly arranged around the metal container 54. The interior of the metal container 54 is filled with phase change energy storage filler 56.

[0046] The diameter of the capillary hot water pipe network 6 is slightly smaller than the capillary network groove 52, and includes a water distributor 61, a water supply branch 62, a return water branch 63 and a water collector 64. One end of the water distributor 61 is connected to one end of the water supply main 65, and the other end of the water supply main 65 is connected to the water supply port of the hot water source. The other end of the water distributor 61 is connected to the water supply branch 62, and one end of the return water branch 63 is connected to the end of the water supply branch 62 away from the water distributor 61. The other end of the return water branch 63 is connected to the water collector 64. The water collector 64 is also connected to one end of the return water main 66, and the other end of the return water main 66 is connected to the return water port of the hot water source. The water supply main 65, the water supply branch 62, the return water branch 63 and the return water main 66 are all arranged in the capillary network groove 52.

[0047] The exhaust system 7 includes an exhaust fan 71, an exhaust duct 72, a heat exchange fin tube 73 and an exhaust duct outlet 74. The exhaust fan 71 is arranged on the side of the surface floor 43 close to the fresh air inlet 34, and the air inlet of the exhaust fan 71 is located on the surface of the surface floor 43. The indoor exhaust outlet of the exhaust fan 71 is connected to the exhaust duct 72, and a filter 75 is provided at the connection point. The exhaust duct 72 is surrounded and embedded in the ventilation tunnel 31, and the heat exchange fin tube 73 is arranged on the outside of the exhaust duct 72. The exhaust duct outlet 74 is arranged at one end of the exhaust duct 72 away from the exhaust fan 71, and passes through the wall 11 to be located outdoors.

[0048] The automatic control system includes an indoor fresh air volume control system and a circulating hot water temperature control system. The air volume of the fresh air channel 3 is regulated by the indoor fresh air volume control system. The indoor fresh air volume control system includes a multi-speed manual switch, an air outlet wind speed sensor, an electric air valve and a fan control system. The air outlet wind speed sensor and the electric air valve are both arranged at the fresh air inlet 34. The fan control system is connected to the fresh air fan 32 and the exhaust fan 71. The multi-speed manual switch receives the signal from the air outlet wind speed sensor and sends a signal to the electric air valve and the fan control system at the same time to control the air intake and exhaust of the system.

[0049] The circulating hot water temperature control system includes an indoor temperature sensor, a circulating hot water temperature sensor and a heat pump start controller. There are several indoor temperature sensors, which are installed inside the room 1. The circulating hot water temperature sensor is set in the capillary hot water pipe network 6, and the heat pump start controller is set at the hot water source.

[0050] The metal container 54 of the phase change energy storage module 5 selected in this embodiment has a size of 260mm×260mm×20mm and good thermal conductivity. The spacing between the fins 55 is 50mm. The phase change energy storage filler 56 filled inside is 38°C paraffin, and 5%-10% graphene is added to the paraffin. The two are stirred into a viscous state before being added to the container. The surface bottom plate is a wooden floor with good thermal conductivity. The capillary hot water pipe network 6 supplies heat to the room through heat exchange in the form of radiation and convection. The water supply main 65 and the return water main 66 in the capillary hot water pipe network 6 are made of PC pipes with high strength and good durability. The design of the hose at the connection not only reduces local head loss, but also prevents water pipe rupture due to thermal expansion and contraction. The height of the ventilation tunnel 31 is 60-80mm.

[0051] When working, first divide the heating demand in the residence into weekday and weekend conditions;

[0052] The heating period on weekdays is concentrated in the morning from 6:30 to 8:00 and after get off work from 18:00 to 23:00. At 5:30 to 6:30, the heat pump start controller of the circulating hot water temperature control system changes the gear of the hot water source (heat pump) to the heating gear. Its power is greater than the indoor heat load. The capillary hot water pipe network 6 stores heat for the phase change material and preheats the indoor environment. Specifically, the hot water is distributed from the main water supply pipe of the capillary pipe network system to the water distributor 61, and then in turn through the water supply branch pipe, return pipe, and heat exchanger. The water branch pipe 63 flows to the water collector 64 and then returns to the hot water source through the return water main 66; the heat pump is turned off from 6:30 to 8:00, and the phase change material releases heat to the room to bear the heating load. The circulating hot water temperature sensor monitors the hot water temperature in real time, and the indoor temperature sensor monitors the indoor temperature in real time; to meet the heating demand from 18:00 to 23:00, the heat pump needs to be turned on from 15:00 to 18:00 to store heat for the phase change material, and the process is the same as from 5:30 to 6:30. The hot water pipe network system is shut down during the time period of 18:00-23:00, and the phase change material releases heat to the room to bear the heating load. During the heating period, i.e. 6:30-8:00 and 18:00-23:00, if the temperature of the phase change material drops after it fully releases the latent heat of phase change, resulting in insufficient indoor heating, and the indoor temperature sensor detects that the room temperature drops below 16°C, the hot water pipe network system is reopened to the insulation gear, the water supply temperature is lowered, and the temperature of the phase change material is lower than its melting point. The hot water pipe network only bears the heat load in the room. During the entire process, the fresh air preheating system 2 draws in outside air and preheats it, and opens the electric air valve under the control of the fresh air volume control system. The preheated air enters the ventilation tunnel 31 through the fresh air inlet 34, and during the process, it will be subjected to secondary heating of the exhaust air from the exhaust system 7. Afterwards, the secondary heated air in the ventilation tunnel 31 will be heated again by the hot water in the capillary hot water pipe network 6, and then pass through the cavity 14 in the wall and enter the room through the automatically adjustable louvers 33 under the action of the fresh air fan 32. During this process, the fan control system will control the fresh air fan 32 to control the air intake, and at the same time, it can also adjust the angle of the automatically adjustable louvers 33, and can also be manually adjusted through a multi-speed manual switch. After the hot air circulates indoors, the fan control system controls the exhaust fan 71 to draw it through the exhaust duct 72 to the exhaust duct outlet 74 and discharge it outdoors. In this process, the preheated air entering the ventilation tunnel 31 through the fresh air inlet 34 will be secondary heated.

[0053] Weekend heating runs from 8:00 AM to 11:00 PM. Considering the concentrated heating hours, the heat pump automatically activates the heating mode from 11:00 PM to 7:00 AM, allowing the hot water network to store heat for the phase-change material. This process is identical to the weekday heating periods of 5:30 AM to 6:30 AM and 3:00 PM to 6:00 PM. In the morning, the heat pump is shut down, allowing the phase-change material to transfer heat to the room, fulfilling the heating load. However, a temperature sensor monitors the indoor temperature. If the sensor detects the indoor air temperature falls below 16°C, the hot water network is turned back on to the insulation mode. In the afternoon, from 3:00 PM to 6:00 PM, the heat pump automatically activates the heating mode to store heat for the phase-change material. From 6:00 PM to 11:00 PM, the hot water network is shut down, and a temperature sensor monitors the indoor temperature. If the room temperature drops below 16°C, the hot water network is automatically turned back on to the insulation mode. The entire process heats the air in the same manner as on weekdays. The reasonable connection between phase change heat storage and heat release enables the system to operate at off-peak speed, thus saving a lot of electricity costs.

[0054] Therefore, the present invention adopts a vertical geothermal ventilation and phase change energy storage floor fresh air coupling system of the above structure, and pre-cools or pre-heats the air before it enters the room through the vertical casing buried in the ground by the fresh air preheating system (the underground part of the outer pipe and the inner pipe), which can significantly reduce the air conditioning load and improve the energy utilization efficiency of the building; it has the characteristics of intermittent operation, and can store energy during off-peak hours and release heat / cold during peak hours, forming a good dynamic coupling with the heat storage and release process of the phase change material, and realizing the energy-saving operation mode of "peak shaving and valley filling"; the bracket column structure is used to support the fresh air channel, and the exhausted waste heat is used for fresh air preheating, which not only effectively recovers the indoor waste heat, but also solves the problem of inaccurate household metering of the traditional floor heating system; by setting up an exhaust system, the exhaust heat is used to perform secondary heating treatment on the fresh air, The energy burden required for introducing external fresh air is reduced, and while ensuring the indoor air quality, the overall energy efficiency of the system is further improved; the modular phase change energy storage unit is adopted, which is convenient for prefabrication and on-site integration, reducing the complexity and cost of decoration construction; the system adopts a channel-type fresh air supply method to replace the traditional central air-conditioning fresh air system, which not only ensures the circulation of fresh air, but also effectively reduces the energy consumption of the system; the radiation heating method is used for heating. Compared with the traditional radiator system, it has lower requirements for indoor temperature control and has a higher energy efficiency ratio, while significantly improving the indoor thermal comfort. By using an automatic control system to control heating and hot air circulation, on the basis of maintaining a comfortable indoor thermal environment, the system's peak-shaving operation is achieved through the reasonable connection between phase change heat storage and heat release, thereby saving a lot of electricity bills.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A vertical geothermal ventilation and phase change energy storage floor fresh air coupling system, characterized by: The utility model comprises a room body and a fresh air preheating system, one end of the fresh air preheating system absorbs outside air, and the other end passes through the room body and is connected to one end of the fresh air duct, the end of the fresh air duct close to the fresh air preheating system is arranged on the bottom side of the room body, and the other end is arranged on the upper side of the wall of the room body away from the fresh air preheating system. An internal interlayer is also arranged on the bottom side of the room body, a phase change energy storage module is arranged on the internal top of the internal interlayer, a capillary hot water pipe network is arranged between the upper side of the phase change energy storage module and the internal interlayer, an exhaust system is arranged on the end of the internal interlayer close to the fresh air preheating system, one end of the exhaust system is located on the upper surface of the internal interlayer, and the other end passes through the internal interlayer, the fresh air duct and the room body and is located outside the room body, the fresh air duct, the capillary hot water pipe network and the exhaust system are also connected to the automatic control system.

2. The vertical geothermal ventilation and phase change energy storage floor fresh air coupling system according to claim 1 is characterized by: The room body includes walls, floor and roof. The floor is located above the ground. There are four walls located around the upper side of the floor. A cavity is set in the wall away from the fresh air preheating system. The roof is set above the four walls.

3. The vertical geothermal ventilation and phase change energy storage floor fresh air coupling system according to claim 2 is characterized by: The fresh air preheating system includes an outer pipe and an inner pipe. External air enters the fresh air preheating system through one end of the outer pipe, and a filter is provided at this end. The other end of the outer pipe extends vertically into the ground. One end of the inner pipe passes through the outer pipe and extends vertically into the ground together with the outer pipe, and the other end passes through a wall close to the fresh air preheating system and is connected to the fresh air channel. Both the outer and inner pipes are made of stainless steel, and a 50mm thick polyurethane insulation pipe is provided on the outside of the inner pipe.

4. The vertical geothermal ventilation and phase change energy storage floor fresh air coupling system according to claim 3 is characterized by: The fresh air duct includes a ventilation tunnel, a fresh air fan and automatically adjustable louvers. The ventilation tunnel is located between the four walls above the floor slab. A fresh air inlet connected to the inner pipe is provided at one end of the ventilation tunnel close to the fresh air preheating system, and the other end away from the fresh air preheating system is connected to one end of the cavity in the wall. The other end of the cavity in the wall is connected to the fresh air fan through the fresh air outlet, and the automatically adjustable louvers pass through the inner wall and are connected to the fresh air fan.

5. The vertical geothermal ventilation and phase change energy storage floor fresh air coupling system according to claim 4 is characterized by: The internal mezzanine includes a support column structure, a polyester insulation layer and a surface floor. The polyester insulation layer is located above the ventilation tunnel. There are several support column structures, and each support column structure includes a pillar and a frame column. One end of the pillar is fixed to the upper side of the floor slab, and the other end is connected to the lower side of the polyester insulation layer to support the polyester insulation layer. One end of the frame column is connected to the upper side of the polyester insulation layer, and the other end is connected to the surface floor to support the surface floor.

6. The vertical geothermal ventilation and phase change energy storage floor fresh air coupling system according to claim 5 is characterized by: There are several phase change energy storage modules, each of which is embedded in the upper surface of the frame and connected to the lower surface of the surface floor. The phase change energy storage modules are connected to each other. The phase change energy storage modules include positioning protrusions, capillary network grooves, positioning recesses, metal containers and fins. There are two positioning protrusions and two positioning recesses, and one positioning protrusion and one positioning recess are symmetrically arranged on both sides of the metal container. The capillary network groove is located on the upper surface of the metal container, and the upper surface of the metal container is also connected to the surface floor. There are several fins, which are evenly arranged around the metal container. The interior of the metal container is filled with phase change energy storage filler.

7. The vertical geothermal ventilation and phase change energy storage floor fresh air coupling system according to claim 6 is characterized by: The diameter of the capillary hot water pipe network is slightly smaller than the capillary network groove, and includes a water distributor, a water supply branch, a return branch and a water collector. One end of the water distributor is connected to one end of the water supply main, and the other end of the water supply main is connected to the water supply port of the hot water source. The other end of the water distributor is connected to the water supply branch, and one end of the return branch is connected to the end of the water supply branch away from the water distributor. The other end of the return branch is connected to the water collector. The water collector is also connected to one end of the return main, and the other end of the return main is connected to the return port of the hot water source. The water supply main, water supply branch, return branch and return main are all arranged in the capillary network groove.

8. The vertical geothermal ventilation and phase change energy storage floor fresh air coupling system according to claim 7 is characterized by: The exhaust system includes an exhaust fan, an exhaust duct, a heat exchange fin tube and an exhaust duct outlet. The exhaust fan is arranged on the side of the surface floor close to the fresh air inlet, and the air inlet of the exhaust fan is located on the surface of the surface floor. The indoor exhaust outlet of the exhaust fan is connected to the exhaust duct, and a filter is provided at the connection point. The exhaust duct is surrounded and embedded in the ventilation tunnel, and the heat exchange fin tube is arranged on the outside of the exhaust duct. The exhaust duct outlet is arranged at the end of the exhaust duct away from the exhaust fan, and passes through the wall to be located outdoors.

9. The vertical geothermal ventilation and phase change energy storage floor fresh air coupling system according to claim 8 is characterized by: The automatic control system includes an indoor fresh air volume control system and a circulating hot water temperature control system. The air volume of the fresh air channel is regulated by the indoor fresh air volume control system. The indoor fresh air volume control system includes a multi-speed manual switch, an air outlet wind speed sensor, an electric air valve and a fan control system. The air outlet wind speed sensor and the electric air valve are both set at the fresh air inlet. The fan control system is connected to the fresh air fan and the exhaust fan. The multi-speed manual switch receives the signal from the air outlet wind speed sensor and sends a signal to the electric air valve and the fan control system at the same time to control the air intake and exhaust of the system.

10. The vertical geothermal ventilation and phase change energy storage floor fresh air coupling system according to claim 9 is characterized by: The circulating hot water temperature control system consists of an indoor temperature sensor, a circulating hot water temperature sensor and a heat pump start controller. There are several indoor temperature sensors, which are installed inside the room. The circulating hot water temperature sensor is set in the capillary hot water pipe network, and the heat pump start controller is set at the hot water source.

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