Fresh air ventilator control method of near-zero energy consumption building and fresh air ventilator

Abstract

The invention discloses a fresh air ventilator control method of a near-zero-energy-consumption building and a fresh air ventilator. The fresh air ventilator control method comprises the following steps that air quality and temperature data of an outdoor air quality sensor, an indoor air quality sensor and an air outlet temperature sensor are obtained; comparing the obtained indoor and outdoor air quality parameters; skipping to an internal circulation working condition when the outdoor air quality is very poor; when the outdoor air quality is very good, and the outdoor temperature is more consistent with the body feeling comfortable temperature than the indoor temperature, the working condition jumps to the two-way bypass working condition; when the outdoor temperature is extremely low, jumping to a quick defrosting working condition; and when the indoor and outdoor air quality and temperature do not conform to the conditions, a heat exchange working condition is skipped to. Wind resistance and energy loss are actively reduced through a two-way bypass structure, the operation working condition and power are intelligently adjusted through various air valves, a pressure taking module, a built-in auxiliary heating box and other assemblies, and energy consumption is further reduced.

Description

Technical Field

[0001] The invention relates to a new air fan control method for a near-zero energy consumption building and also relates to a corresponding new air fan, belonging to the technical field of air conditioning. Background Art

[0002] The market demand for near-zero energy buildings is continuing to grow. As an indispensable component of near-zero energy buildings, the market demand for fresh air ventilators is continuing to grow. At present, the limitations of heat exchange materials make it difficult to further improve the heat recovery efficiency of fresh air fans. Therefore, reducing energy consumption has become the key to saving energy. In order to solve this problem, Chinese invention patent ZL 202210817385.5 proposes a bypass adjustment method and a corresponding fresh air fan. This technical solution automatically adjusts the air volume passing through the heat exchange channel and the bypass channel by real-time monitoring of indoor and outdoor temperature and humidity, which effectively saves energy while improving user comfort.

[0003] In addition, Chinese utility model patent ZL 202223460616.6 discloses a multifunctional total heat exchange device. The device consists of an independent air supply chamber, an exhaust chamber, an outdoor fresh air chamber, a heat exchanger chamber, an indoor return air chamber and a filter chamber. The total heat exchanger is fixed in the heat exchanger chamber to form a channel between the outdoor fresh air chamber and the air supply chamber, and a channel between the indoor return air chamber and the exhaust chamber. The fresh air fan and the exhaust air fan are respectively arranged in the air supply chamber and the exhaust chamber. The return air chamber is divided into an upper layer and a lower layer, which are connected by an internal circulation valve. The device can realize multiple functions through different modes, and improve the quality of fresh air in multiple modes through multiple filters.

[0004] Nevertheless, the traditional automatic control method of fresh air equipment, that is, by constantly detecting the indoor and outdoor temperatures and selecting the open mode between the heat exchange mode and the bypass mode, has been proven to be insufficient in practice. In order to further improve the efficiency of the fresh air system and the comfort of users, more advanced control solutions are needed. Summary of the invention

[0005] The primary technical problem to be solved by the present invention is to provide a method for controlling a fresh air fan in a near-zero energy consumption building.

[0006] Another technical problem to be solved by the present invention is to provide a new air fan for a near-zero energy consumption building.

[0007] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0008] According to a first aspect of an embodiment of the present invention, a method for controlling a fresh air fan in a near-zero energy building is provided, comprising the following steps:

[0009] S1: Fresh air blower self-test after startup;

[0010] S2: The controller obtains the air quality and temperature data from the outdoor air quality sensor, indoor air quality sensor and outlet air temperature sensor;

[0011] S3: The controller compares the obtained indoor and outdoor air quality parameters. When the outdoor air quality is very poor, the controller jumps to step S4; when the outdoor air quality is very good and the outdoor temperature is more in line with the body's comfortable temperature than the indoor temperature, the controller jumps to step S5; when the outdoor temperature is extremely low, the controller jumps to step S6; when the indoor and outdoor air quality and temperature do not meet the above conditions, the controller jumps to step S7;

[0012] S4: the controller controls the internal circulation valve, the fresh air bypass valve and the return air bypass valve to remain in an open state, the exhaust valve, the air inlet valve and the exhaust fan to remain in a closed state, the fresh air fan to remain in a running state, and jumps to step S8;

[0013] S5: The controller controls the exhaust valve, the inlet valve, the fresh air bypass valve and the return air bypass valve to remain in an open state, the internal circulation valve to remain in a closed state, the fresh air fan and the exhaust air fan to remain in an operating state, and jumps to step S8;

[0014] S6: The controller controls the exhaust valve, the air inlet valve, the fresh air bypass valve, the return air bypass valve and the exhaust fan to remain in a closed state, the internal circulation valve to remain in an open state, and the fresh air fan to remain in an operating state, and after maintaining the set time, jumps to step S7;

[0015] S7: the controller controls the exhaust valve and the inlet valve to remain in an open state, the internal circulation valve, the fresh air bypass valve and the return air bypass valve to remain in a closed state, the fresh air fan and the exhaust air fan to remain in a running state, and jumps to step S8;

[0016] S8: The controller obtains wind pressure data from the wind pressure sensor and calculates the actual air volume of fresh air;

[0017] S9: The controller obtains the set air volume of the fresh air outlet and compares it with the actual air volume. When the actual air volume is greater than the set air volume, the fresh air fan downshifts to reduce the air volume and jumps to step S8; when the actual air volume is equal to the set air volume, the fresh air fan maintains the operating gear to maintain the air volume and jumps to step S2; when the actual air volume is less than the set air volume, the fresh air fan upshifts to increase the air volume and jumps to step S8.

[0018] Preferably, the step S1 further includes: operating the fresh air fan under default operating conditions and default gear position.

[0019] Preferably, step S7 includes the following sub-steps:

[0020] S71: the controller controls the preheating box to keep running according to the air outlet temperature and the set temperature, and jumps to step S8;

[0021] S72: The controller controls the auxiliary heating box to keep running according to the air outlet temperature and the set temperature, and jumps to step S8.

[0022] According to a second aspect of an embodiment of the present invention, there is provided a fresh air fan for a near-zero energy consumption building, comprising a chassis, a fresh air fan, an exhaust air fan, a heat exchanger, an internal circulation valve, a fresh air bypass valve and a return air bypass valve; wherein,

[0023] The interior of the chassis is divided into an air outlet chamber, an exhaust chamber, an air inlet chamber, a heat exchanger chamber and a return air chamber which are independent of each other;

[0024] The heat exchanger is fixed in the heat exchanger chamber, forming a passage passing through the air inlet chamber and the air outlet chamber, and a passage passing through the air return chamber and the air exhaust chamber;

[0025] The internal circulation valve is switchably arranged between the air inlet chamber and the heat exchanger to achieve connection or disconnection between the air inlet chamber and the exhaust chamber;

[0026] The fresh air bypass valve is fixed in the heat exchanger chamber to form a bypass channel that passes through the air inlet chamber and the air outlet chamber;

[0027] The return air bypass valve is fixed in the heat exchanger chamber to form a bypass passage that passes through the return air chamber and the exhaust air chamber;

[0028] The fresh air fan is arranged in the air outlet chamber, and the exhaust air fan is arranged in the exhaust chamber.

[0029] Preferably, the fresh air fan further includes an air outlet valve and an air inlet valve; wherein,

[0030] The exhaust valve is arranged at the exhaust port of the exhaust chamber, and the exhaust fan exhausts air to the outdoors through the exhaust valve, and prevents the outdoor air from flowing back into the exhaust chamber; the air inlet valve is arranged at the air inlet of the air inlet chamber, and is used to connect and block the flow between the outdoor air and the air inlet chamber.

[0031] Preferably, the fresh air fan further includes an outdoor air quality sensor, an indoor air quality sensor, an outlet air temperature sensor, a wind pressure sensor and a controller; wherein,

[0032] The outdoor air quality sensor is arranged at the outdoor side of the fresh air fan; the indoor air quality sensor is arranged at the indoor side of the fresh air fan; the air outlet temperature sensor is arranged at the outlet of the air outlet chamber; the wind pressure sensor is arranged at the outlet of the air outlet chamber, and is used to detect the air flow pressure discharged by the fresh air fan;

[0033] The controller is set at the outer side and the inner side of the chassis, and is used to control the working status of each valve and fan and obtain data from each sensor.

[0034] Preferably, the fresh air fan further includes a preheating box and an auxiliary heating box; wherein,

[0035] The preheating box is arranged in the air inlet chamber, and the auxiliary heating box is arranged in the air outlet chamber, and the operating state is controlled by the controller.

[0036] Preferably, the fresh air fan further includes a fresh air primary filter, a return air primary filter and a high efficiency filter; wherein,

[0037] The fresh air primary filter is arranged between the air inlet chamber and the heat exchanger, and between the air inlet chamber and the fresh air bypass valve;

[0038] The return air primary filter is arranged between the return air chamber and the heat exchanger, and between the return air chamber and the return air bypass valve;

[0039] The high efficiency filter is arranged between the heat exchanger and the air outlet chamber, and between the fresh air bypass valve and the air outlet chamber.

[0040] Preferably, the exhaust chamber is adjacent to the air inlet chamber, and the air outlet chamber is adjacent to the return air chamber; the heat exchanger chamber is located in the middle, the air outlet chamber and the exhaust chamber are located on both sides of the heat exchanger chamber, and the air inlet chamber and the return air chamber are also located on both sides of the heat exchanger chamber.

[0041] Compared with the prior art, the fresh air fan control method provided in the embodiment of the present invention automatically controls the fresh air fan to operate in a suitable mode and gear by real-time monitoring of the outdoor air state, indoor air state and fresh air fan air volume state, and fully utilizes natural energy to reduce energy consumption as much as possible on the basis of meeting user needs. Accordingly, the fresh air fan provided in the embodiment of the present invention actively reduces wind resistance and energy loss through a unique two-way bypass structure. At the same time, various components such as air valves, pressure taking modules and built-in auxiliary heating boxes are added to the fresh air fan structure, and the operating conditions and power are adjusted through an intelligent electronic control system to further reduce the energy consumption of the fresh air fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1This is a structural schematic diagram of a fresh air fan in the first embodiment of the present invention;

[0043] Figure 2 for Figure 1 A schematic diagram of the structure of the inner circulation valve in FIG.

[0044] Figure 3(a) shows Figure 1 The structural diagram of the fresh air bypass valve in FIG.

[0045] Figure 3(b) shows Figure 1 The structural diagram of the return air bypass valve in FIG.

[0046] Figure 4 for Figure 1 Schematic diagram of the air path of the fresh air fan in heat exchange working condition;

[0047] Figure 5 for Figure 1 Schematic diagram of the two-way bypass air path of the fresh air fan in the working condition;

[0048] Figure 6 for Figure 1 Schematic diagram of the internal circulation air path of the fresh air fan;

[0049] Figure 7 This is a schematic diagram of the operation mode of the fresh air blower in a low temperature environment in the first embodiment and the second embodiment of the present invention;

[0050] Figure 8 This is a schematic diagram of the auxiliary heating mode of the fresh air fan in the third embodiment of the present invention;

[0051] Fig. 9 This is a structural schematic diagram of a fresh air fan in the fourth embodiment of the present invention;

[0052] Fig.10 This is a schematic diagram of the steps of a method for controlling a fresh air fan in a near-zero energy building in the fifth embodiment of the present invention. DETAILED DESCRIPTION

[0053] The technical content of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0054] The technical concept in the embodiment of the present invention is: to add a two-way bypass structure to the fresh air fan, and to control the fresh air fan to operate in an appropriate mode and gear by real-time monitoring of indoor and outdoor air quality (including but not limited to humidity, PM2.5, CO2 and VOC, etc.), temperature and air volume status of the fresh air fan.

[0055] First embodiment

[0056] like Figure 1As shown, an embodiment of the present invention provides a fresh air fan, including a chassis 1, a fresh air fan 2, an exhaust fan 3, an exhaust valve 4, an air inlet valve 5, a fresh air primary filter 6, a heat exchanger 7, a return air primary filter 8, an internal circulation valve 9, a high efficiency filter 10, a fresh air bypass valve 11 and a return air bypass valve 12. Among them, the fresh air fan 2 and the exhaust fan 3 are collectively referred to as fans, and the exhaust valve 4, the air inlet valve 5, the internal circulation valve 9, the fresh air bypass valve 11 and the return air bypass valve 12 are collectively referred to as valves.

[0057] The chassis 1 is a rectangular structural member made of metal sheets, and the interior is divided into multiple independent spaces by partitions, which are called air chambers. Different components are provided in each air chamber to realize different functions in the air flow path. The air chamber includes an air outlet chamber R1, an exhaust chamber R2, an air inlet chamber R3, a heat exchanger chamber R4 and a return air chamber R5. The exhaust chamber R2 is adjacent to the air inlet chamber R3, and the air outlet chamber R1 is adjacent to the return air chamber R5. The heat exchanger chamber R4 is located in the middle, and the air outlet chamber R1 and the exhaust chamber R2 are located on both sides of the heat exchanger chamber R4, and are symmetrical with respect to the heat exchanger chamber R4. Similarly, the air inlet chamber R3 and the return air chamber R5 are located on both sides of the heat exchanger chamber R4, and are symmetrical with respect to the heat exchanger chamber R4.

[0058] In the fresh air fan provided in the embodiment of the present invention, the fresh air fan 2 is a driving device for supplying air to the indoor side, and the exhaust air fan 3 is a driving device for exhausting air to the outdoor side. The fresh air fan 2 is arranged in the air outlet chamber R1 in the chassis 1, and the exhaust air fan 3 is arranged in the exhaust air chamber R2. The exhaust port valve 4 is arranged at the exhaust port of the exhaust air chamber R2, allowing the exhaust air fan 3 to exhaust air to the outdoor side and preventing the outdoor air from flowing in the reverse direction into the exhaust air chamber R2. The air inlet valve 5 is arranged at the air inlet of the air inlet chamber R3, which can connect and block the two-way flow between the outdoor air and the air inlet chamber R3.

[0059] The heat exchanger 7 provided in the embodiment of the present invention is a hexagonal columnar component, with a heat exchange efficiency of 75% or more, and is arranged in the heat exchanger chamber R4. The heat exchanger 7 divides the heat exchanger chamber R4 into a junction area R41, an exhaust area R42, a fresh air area R43, and a turbid air area R44. A sealing film is provided on the mating surface of the chassis 1 and the heat exchanger 7 to ensure the airtight isolation of the four partitions.

[0060] The heat exchanger 7 directly connects the fresh air area R43 with the intersection area R41, and this channel is called the fresh air channel. The heat exchanger 7 directly connects the turbid air area R44 with the exhaust area R42, and this channel is called the return air channel. The fresh air channel and the return air channel inside the heat exchanger 7 are airtightly isolated from each other, but its layered and staggered internal air duct structure and special material properties enable the airflow in the two channels to fully exchange heat, thereby reducing the energy loss of the air conditioning equipment and achieving the effect of energy saving and emission reduction.

[0061] The fresh air zone R43 is connected to the air inlet chamber R3, and a fresh air primary filter 6 is arranged between the air inlet chamber R3 and the heat exchanger 7. The intersection zone R41 is connected to the air outlet chamber R1, and a high efficiency filter 10 is arranged between the heat exchanger 7 and the air outlet chamber R1. The turbid air zone R44 is connected to the return air chamber R5, and a return air primary filter 8 is arranged between the return air chamber R5 and the heat exchanger 7. The exhaust zone R42 is connected to the exhaust chamber R2. The fresh air primary filter 6, the return air primary filter 8 and the high efficiency filter 10 can filter suspended particles and odors in the airflow.

[0062] The internal circulation valve 9 is switchably arranged between the air inlet chamber R3 and the air exhaust area R42.

[0063] like Figure 2 As shown, the internal circulation valve 9 includes an internal circulation valve body 91 and an internal circulation valve plate 92. Among them, the internal circulation valve body 91 is a rectangular body structural member with a hollow structure. Due to the structural characteristics of the rectangular body, it has multiple pairs of surfaces (relative surfaces) that are opposite to each other. The internal circulation valve plate 92 is a rectangular plate structure with a rotating axis, and the two ends of the rotating axis are in contact with a pair of opposite surfaces of the internal circulation valve body 91 and are rotatably connected. In other words, one end of the rotating axis of the internal circulation valve plate 92 is rotatably connected to a surface of the internal circulation valve body 91, and the other end of the rotating axis is rotatably connected to the surface opposite to the surface. The structure of the internal circulation valve plate 92 is designed so that when the internal circulation valve plate 92 rotates around the rotating axis to a designed angle, the internal circulation valve body 91 can be separated into two independent and non-interconnected air chambers, namely the first air chamber R91 of the internal circulation valve and the second air chamber R92 of the internal circulation valve. When the inner circulation valve plate 92 rotates to the design angle, the first air chamber R91 of the inner circulation valve and the second air chamber R92 of the inner circulation valve are hermetically isolated from each other, which is called the closed state (closed) of the inner circulation valve 9. Conversely, when the inner circulation valve plate 92 rotates to the design angle, the first air chamber R91 of the inner circulation valve and the second air chamber R92 of the inner circulation valve are connected to each other, which is called the open state (open) of the inner circulation valve 9.

[0064] In the fresh air fan provided by the embodiment of the present invention, a plurality of circulation air chamber openings 93 are provided on the inner circulation valve body 91 of the inner circulation valve first air chamber R91 and the inner circulation valve second air chamber R92. Through the circulation air chamber openings 93, the inner circulation valve first air chamber R91 and the air inlet chamber R3 are interconnected, and the inner circulation valve second air chamber R92 and the exhaust area R42 are interconnected. Opening the inner circulation valve 9 can connect the air inlet chamber R3 and the exhaust area R42. Closing the inner circulation valve 9 blocks the connection, and the air inlet chamber R3 and the exhaust area R42 are kept airtightly isolated. In other words, opening the inner circulation valve 9 can connect the air inlet chamber R3 and the exhaust chamber R2, and can connect the exhaust area R42 and the fresh air area R43.

[0065] The fresh air bypass valve 11 and the return air bypass valve 12 are bypass valves with the same structure, and have a hexagonal columnar body with the same cross-section as the heat exchanger 7. They are arranged in the heat exchanger chamber R4, located in the axial position of the heat exchanger chamber R4, close to one side of the air inlet chamber R3 and the return air chamber R5.

[0066] As shown in FIG. 3( a ), the fresh air bypass valve 11 includes a fresh air bypass valve body 111 and a fresh air bypass valve plate 112. The fresh air bypass valve body 111 is a hexagonal column structure with a hollow structure. The fresh air bypass valve body 111 is coaxial with the heat exchanger 7 and has the same hexagonal cross-section as the heat exchanger 7. Due to the structural characteristics of the hexagonal column, the fresh air bypass valve body 111 has multiple pairs of surfaces (opposite surfaces) that are opposite to each other. The fresh air bypass valve plate 112 is a rectangular plate structure with a rotating shaft, and both ends of the rotating shaft are in contact with a pair of opposite surfaces of the fresh air bypass valve body 111 and are rotatably connected. At the same time, the rotating shaft of the fresh air bypass valve plate 112 is perpendicular to the columnar axis of the fresh air bypass valve body 111. In other words, one end of the rotating shaft of the fresh air bypass valve plate 112 is rotatably connected to a surface of the fresh air bypass valve body 111, and the other end of the rotating shaft is rotatably connected to a surface opposite to the surface. The fresh air bypass valve plate 112 is designed so that when the fresh air bypass valve plate 112 rotates around the rotation axis to a designed angle, the fresh air bypass valve body 111 can be separated into two independent and non-interconnected air chambers, namely, the first air chamber R111 of the fresh air bypass valve and the second air chamber R112 of the fresh air bypass valve. When the fresh air bypass valve plate 112 rotates to a designed angle, the first air chamber R111 of the fresh air bypass valve and the second air chamber R112 of the fresh air bypass valve are airtightly isolated from each other, which is called the closed state (closed) of the fresh air bypass valve 11. Conversely, when the fresh air bypass valve plate 112 rotates to a designed angle, the first air chamber R111 of the fresh air bypass valve and the second air chamber R112 of the fresh air bypass valve are interconnected, which is called the open state (open) of the fresh air bypass valve 11.

[0067] As shown in FIG. 3( b ), the return air bypass valve 12 has the same structure as the fresh air bypass valve 11 , including a return air bypass valve body 121 , a return air bypass valve plate 122 , a first return air bypass valve chamber R 121 and a second return air bypass valve chamber R 122 , which will not be described in detail herein.

[0068] The fresh air bypass valve 11, the return air bypass valve 12 and the heat exchanger 7 are arranged along the axis of the column and are coaxial with each other. The fresh air bypass valve 11 and the return air bypass valve 12 are located on one side close to the air inlet chamber R3 and the return air chamber R5. One side of the return air bypass valve 12 is in contact with the heat exchanger 7, and the other side is in contact with the fresh air bypass valve 11, and the other side of the fresh air bypass valve 11 is in contact with the chassis 1. Optionally, one side of the fresh air bypass valve 11 is in contact with the heat exchanger 7, and the other side is in contact with the return air bypass valve 12, and the other side of the return air bypass valve 12 is in contact with the chassis 1. In other words, the cross-sectional projections of the heat exchanger 7, the fresh air bypass valve 11 and the return air bypass valve 12 perpendicular to the axis of the heat exchanger chamber R4 overlap with each other.

[0069] In the fresh air fan provided in the embodiment of the present invention, a plurality of fresh air chamber openings 113 are provided on the fresh air bypass valve body 111 of the first air chamber R111 of the fresh air bypass valve and the second air chamber R112 of the fresh air bypass valve. Through the fresh air chamber openings 113, the first air chamber R111 of the fresh air bypass valve and the fresh air area R43 are interconnected, and the second air chamber R112 of the fresh air bypass valve and the intersection area R41 are interconnected. Similarly, a plurality of return air chamber openings 123 are provided on the return air bypass valve body 121 of the first air chamber R121 of the return air bypass valve and the second air chamber R122 of the return air bypass valve. Through the return air chamber openings 123, the first air chamber R121 of the return air bypass valve and the turbid air area R44 are interconnected, and the second air chamber R122 of the return air bypass valve and the exhaust area R42 are interconnected.

[0070] After the fresh air bypass valve 11 is opened, the fresh air area R43 is directly connected to the intersection area R41, and this channel is called the fresh air bypass channel. The flow area of ​​the fresh air bypass channel is larger than the flow area of ​​the fresh air channel. The fresh air bypass valve 11 enables the airflow of the air inlet chamber R3 to directly enter the intersection area R41 without passing through the heat exchanger 7. Because the wind resistance of the heat exchanger 7 is large (the flow area is small), the wind resistance of the fresh air channel is much larger than the fresh air bypass channel, and the fresh air channel and the fresh air bypass channel are in parallel, so most of the airflow preferentially flows through the fresh air bypass channel with small wind resistance. Therefore, the provision of the fresh air bypass valve 11 and the fresh air bypass channel can reduce wind resistance and reduce the required speed of the fresh air fan 2, thereby saving energy. After the fresh air bypass valve 11 is closed, the fresh air bypass channel is blocked. A fresh air primary filter 6 is provided between the air inlet chamber R3 and the fresh air bypass valve 11, and a high-efficiency filter 10 is provided between the fresh air bypass valve 11 and the air outlet chamber R1.

[0071] After the return air bypass valve 12 is opened, the turbid air zone R44 is directly connected to the exhaust zone R42, and this channel is called the return air bypass channel. The flow area of ​​the return air bypass channel is larger than the flow area of ​​the return air channel. The return air bypass valve 12 enables the airflow of the return air chamber R5 to directly enter the exhaust zone R42 without passing through the heat exchanger 7. The wind resistance of the return air channel is much larger than that of the return air bypass channel, and the return air channel and the return air bypass channel are in parallel, so most of the airflow preferentially flows through the return air bypass channel with small wind resistance. Therefore, the return air bypass valve 12 and the return air bypass channel can reduce wind resistance and reduce the required speed of the exhaust fan 3, thereby saving energy. After the return air bypass valve 12 is closed, the return air bypass channel is blocked. A return air primary filter 8 is arranged between the return air chamber R5 and the return air bypass valve 12.

[0072] Heat exchange conditions

[0073] This working condition is used to recover the heat of indoor polluted air to heat outdoor fresh air. Or to recover the coldness of indoor polluted air to cool outdoor fresh air. It is used in scenes with large temperature difference between indoor and outdoor in winter or summer, such as scenes with cold outdoor and hot indoor in winter or hot outdoor and cold indoor in summer. In this working condition, the exhaust valve 4 and the air inlet valve 5 remain open, the internal circulation valve 9 remains closed, the fresh air bypass valve 11 and the return air bypass valve 12 remain closed, and the fresh air fan 2 and the exhaust fan 3 remain in operation.

[0074] like Figure 4 As shown, outdoor fresh air enters the fresh air chamber R3 and the fresh air area R43 through the air inlet valve 5, is filtered by the fresh air primary filter 6, exchanges heat with the dirty indoor return air through the heat exchanger 7, enters the intersection area R41, is filtered by the high-efficiency filter 10, and enters the air outlet chamber R1, and is finally delivered into the room by the fresh air fan 2.

[0075] The dirty indoor return air first enters the return air chamber R5 and the dirty air area R44, is filtered by the return air primary filter 8, exchanges heat with the outdoor fresh air through the heat exchanger 7, and then enters the exhaust area R42 and the exhaust chamber R2, and is finally discharged to the outside by the exhaust fan 2 and the exhaust valve 4.

[0076] In this process, the heat exchanger 7 uses the heat of the indoor return air to heat the outdoor fresh air, or uses the coldness of the indoor return air to cool the outdoor fresh air, saving heating or cooling energy. Since the heat exchange efficiency of the heat exchanger 7 reaches 75% or more, it meets the use requirements of near-zero energy consumption buildings. However, the two-way airflow passes through the heat exchanger 7 from the fresh air channel and the return air channel, resulting in large airflow resistance, so the power of the fresh air fan 2 and the exhaust fan 3 is high and the energy consumption is high.

[0077] Two-way bypass condition

[0078] This working condition is used to introduce outdoor fresh air and exhaust indoor dirty air without heat exchange. It is used in scenarios where the perceived comfort of outdoor air is better than that of indoor air, such as scenarios where the temperature difference between indoor and outdoor is small in spring and autumn, and scenarios where the outdoor temperature is lower than that in the indoor temperature at night in summer. Under this working condition, the exhaust valve 4 and the air inlet valve 5 remain open, the internal circulation valve 9 remains closed, the fresh air bypass valve 11 and the return air bypass valve 12 remain open, and the fresh air fan 2 and the exhaust fan 3 remain in operation.

[0079] like Figure 5 As shown, outdoor fresh air enters the fresh air chamber R3 and the fresh air area R43 through the air inlet valve 5, is filtered by the fresh air primary filter 6, enters the intersection area R41 through the fresh air bypass valve 11, enters the air outlet chamber R1 after being filtered by the high-efficiency filter 10, and is finally delivered into the room by the fresh air fan 2.

[0080] The dirty indoor return air first enters the return air chamber R5 and the dirty air area R44, is filtered by the return air primary filter 8, enters the exhaust area R42 and the exhaust air chamber R2 through the return air bypass valve 12, and is finally discharged to the outside by the exhaust fan 2 and the exhaust outlet valve 4.

[0081] In this process, outdoor fresh air is sent into the room, and indoor return air is exhausted to the outside. The two-way airflow is passed through the fresh air bypass channel and the return air bypass channel without passing through the heat exchanger 7, resulting in small air flow resistance. Therefore, the power and energy consumption of the fresh air fan 2 and the exhaust air fan 3 are lower than those under the heat exchange working condition.

[0082] Internal circulation condition

[0083] This working condition is used to isolate outdoor air and only send indoor air back indoors after filtering. It is used in scenes with heavy outdoor pollution. Under this working condition, the internal circulation valve 9, the fresh air bypass valve 11 and the return air bypass valve 12 remain in the open state, the exhaust valve 4, the air inlet valve 5 and the exhaust fan 3 remain in the closed state, and the fresh air fan 2 remains in the running state.

[0084] like Figure 6 As shown, the dirty indoor return air first enters the return air chamber R5 and the dirty air area R44, is filtered by the return air primary filter 8, enters the exhaust area R42 through the return air bypass valve 12, enters the fresh air chamber R3 and the fresh air area R43 through the internal circulation valve 9, is filtered by the fresh air primary filter 6, enters the intersection area R41 through the fresh air bypass valve 11, enters the air outlet chamber R1 after being filtered by the high-efficiency filter 10, and is finally delivered into the room by the fresh air fan 2.

[0085] In this process, the dirty indoor return air is sent back to the room after being filtered. The airflow does not pass through the heat exchanger 7, so the airflow resistance is small, and then the power and energy consumption of the fresh air blower 2 are low.

[0086] Rapid defrosting condition

[0087] This working condition is used to utilize the heat quantity of indoor air to remove frost from the heat exchanger 7, and is applied in winter when the outdoor temperature is low, for example, when the outdoor temperature is between -5 and -30°C. In this working condition, the exhaust valve 4, the air inlet valve 5, the fresh air bypass valve 11 and the exhaust fan 3 remain in a closed state, the internal circulation valve 9 and the return air bypass valve 12 remain in an open state, and the fresh air fan 2 remains in an operating state.

[0088] The warm indoor air first enters the return air chamber R5 and the turbid air area R44, enters the exhaust area R42 through the return air bypass valve 12, enters the fresh air chamber R3 and the fresh air area R43 through the internal circulation valve 9, enters the intersection area R41 through the heat exchanger 7, enters the outlet air chamber R1 after being filtered by the high-efficiency filter 10, and is finally delivered into the room by the fresh air fan 2.

[0089] In this process, warm indoor air flows through the return air bypass channel, the internal circulation valve 9 and the fresh air channel of the heat exchanger 7, and frost is removed from the heat exchanger 7 without using energy-consuming means such as electric heating. According to tests, the defrosting time under this condition is half of the defrosting time of an ordinary ventilator.

[0090] The fresh air fan provided by the prior art is difficult to operate in scenarios where the outdoor temperature is below -10°C. Because it operates in scenarios where the outdoor temperature is below 0°C, the heat exchanger of the fresh air fan provided by the prior art will be blocked by ice. The existing measures are intermittent air supply or exhaust to melt the ice blockage. For example, after 10 minutes of air supply, exhaust for 50 minutes. Because the exhaust air path cannot directly blow the fresh air channel blocked by ice in the heat exchanger, this method can no longer eliminate the ice blockage in scenarios below -10°C. Moreover, the pure exhaust condition not only fails to make full use of the indoor heat, but also causes negative pressure in the indoor area, and the outdoor dirty air enters the indoor area through openings such as door gaps.

[0091] The fresh air fan provided in the embodiment of the present invention uses internal circulation + return air bypass instead of pure exhaust air defrosting. Because the part of the heat exchanger 7 with the lowest temperature is the fresh air channel that introduces fresh air, frost first appears in the fresh air channel. In this working condition, the warm indoor air is directly sent to the fresh air channel of the heat exchanger 7 through the return air bypass channel and the internal circulation valve 9 to defrost and avoid heat loss. And because the flow area of ​​the return air bypass valve 12 and the return air bypass channel is larger than the flow area of ​​the return air channel, the wind speed can be increased, and the defrosting speed can be accelerated, so that the device can still eliminate ice blockage and work normally when the outdoor temperature drops to -30°C.

[0092] like Figure 7As shown, alternating the rapid defrosting condition and the heat exchange condition can enable the fresh air fan to work continuously in the scenario where the outdoor temperature is below 0°C. For example, when the outdoor temperature is between -5 and -10°C, the fresh air fan runs the rapid defrosting condition for 10 minutes after startup to remove frost. Then run the heat exchange condition for 10 minutes to refresh the indoor air and recover the heat of the exhaust air. As the heat exchange condition runs, the fresh air channel of the heat exchanger 7 is affected by the outdoor air intake and gradually frosts. Then run the rapid defrosting condition for 10 minutes to remove frost, and run alternately in sequence. When the outdoor temperature is between -10 and -20°C, the fresh air fan runs the rapid defrosting condition for 20 minutes after startup, then runs the heat exchange condition for 10 minutes, and then runs the rapid defrosting condition for 20 minutes, and runs alternately in sequence. When the outdoor temperature is between -20 and -30℃, the fresh air fan will run in rapid defrosting conditions for 30 minutes after startup, then run in heat exchange conditions for 10 minutes, and then run in rapid defrosting conditions for 30 minutes, alternating in sequence.

[0093] Self-cleaning operation

[0094] This working condition is used for back-blowing cleaning of the fresh air fan after a long period of operation. It can blow out the dirt accumulated in the filter through the exhaust fan 3, reduce the number of times the filter is cleaned, and extend the service life of the filter. In this working condition, the fresh air fan 2, the air inlet valve 5 and the return air bypass valve 12 remain in a closed state, the exhaust valve 4, the internal circulation valve 9 and the fresh air bypass valve 11 remain in an open state, and the exhaust fan 3 remains in an operating state.

[0095] Indoor air enters the return air chamber R5 and the intersection area R41, and blows the high-efficiency filter 10 in the reverse direction. Then the air flows through the fresh air bypass valve 11 into the fresh air area R43 and the air inlet chamber R3, and blows the fresh air primary filter 6 in the reverse direction. The air flows through the internal circulation valve 9 into the exhaust area R42 and the exhaust chamber R2, and is discharged to the outside through the exhaust outlet valve 4 by the exhaust fan 3.

[0096] In this process, the airflow flows through the fresh air bypass valve 11 without passing through the heat exchanger 7, which reduces the air duct resistance, increases the clean air volume, and can achieve the best self-cleaning effect. It is worth noting that if the large particles of pollutants (such as dust, catkins, etc.) and fine particles (such as PM2.5 particles, etc.) intercepted by the fresh air primary filter 6 and the high-efficiency filter 10 are not cleaned in time, the filter may be permanently blocked, thereby affecting the filter life.

[0097] Optionally, under this working condition, the fresh air fan 2 rotates in the reverse direction to form wind pressure and block the backflow from entering the indoor side.

[0098] Second embodiment

[0099] Different from the above-mentioned embodiment, the fresh air fan provided in the embodiment of the present invention further includes a preheating box 13 .

[0100] like Figure 1 As shown, the preheating box 13 is arranged in the air inlet chamber R3, and can heat the fresh air flow entering the air inlet chamber R3 through the air inlet valve 5.

[0101] Preheating condition

[0102] In the preheating condition, the preheating box 13 is turned on to preheat the outdoor fresh air or the air inlet chamber R3. This condition can be used simultaneously with the heat exchange condition, the two-way bypass condition, the internal circulation condition and the rapid defrosting condition. For example, it can be used in the heat exchange condition when the indoor and outdoor temperature difference is large in winter, and the internal circulation condition when the outdoor air quality is poor in winter.

[0103] The outdoor fresh air enters the fresh air chamber R3 through the air inlet valve 5, and the fresh air flow is heated by the preheating box 13 to increase the air inlet temperature of the fresh air channel. For example, when the outdoor temperature is lower than -30°C, the fresh air blower starts the preheating box 13 and operates the heat exchange condition. The heat provided by the preheating box 13 can prevent or delay the frost of the heat exchanger 7, and can alternately operate the rapid defrosting condition according to the operating conditions. For example, Figure 7 As shown, the preheating box 13 is turned on to operate the heat exchange condition for 10 minutes, and then the rapid defrosting condition is operated for 30 minutes, and the operations are alternated in sequence.

[0104] Third embodiment

[0105] Different from the above-mentioned embodiment, the fresh air blower provided in the embodiment of the present invention further includes an auxiliary heating box 14. The preheating box 13 and the auxiliary heating box 14 are collectively referred to as heating equipment.

[0106] like Figure 1 As shown, the auxiliary heating box 14 is disposed in the air outlet chamber R1 and can heat the airflow discharged from the air outlet chamber R1 into the room.

[0107] Auxiliary heating condition

[0108] In the auxiliary heating condition, the auxiliary heating box 14 is turned on to heat the air outlet chamber R1 and the air outlet from the fresh air blower to the room. This condition is used to heat the fresh air flow and can be used simultaneously with the heat exchange condition, the two-way bypass condition, the internal circulation condition and the rapid defrosting condition. For example, it can be used in the heat exchange condition when the indoor and outdoor temperature difference is large in winter, and in the internal circulation condition when the outdoor air quality is poor in winter.

[0109] Taking the heat exchange condition as an example, the outdoor fresh air is heated by the heat exchanger 7, heated again by the auxiliary heating box 14, and then sent into the room by the fresh air blower 2. Figure 8 As shown, when the outlet air temperature at the outlet of the air outlet chamber R1 is lower than 16.5°C, the auxiliary heating box 14 is turned on to heat the outlet air and continues to operate for a set time (such as 3 minutes). When the outlet air temperature is higher than 16.5°C, the auxiliary heating box 14 is not turned on and maintained for a set time (such as 3 minutes).

[0110] When the outdoor temperature is very low in winter, the air delivered into the room by the fresh air fan may also be relatively low, and the air delivered into the room needs to be heated. The current conventional practice is to add auxiliary heating equipment to the air supply duct behind the fresh air supply port. Since the sensor used to detect the temperature of the fresh air fan is placed inside and cannot detect the air temperature outside the fresh air fan, it is impossible to detect the air temperature after the air supply is heated, and therefore it is impossible to accurately control the opening and closing of the auxiliary heating equipment. The general existing practice is to turn on the auxiliary heating equipment for a period of time, and then turn it off for a period of time, and operate it intermittently. This operation mode wastes energy.

[0111] The fresh air blower provided in the embodiment of the present invention integrates the auxiliary heating box 14 into the fresh air blower, and the start and stop durations are controlled by the controller 20. This solution can monitor the temperature of the auxiliary heating box 14 after it is turned on, and can more accurately control the start and stop of the auxiliary heating box 14 to meet the required air outlet temperature, thereby reducing energy loss.

[0112] Fourth embodiment

[0113] Different from the above embodiment, Fig. 9 As shown, the fresh air fan provided in the embodiment of the present invention further includes an outdoor air quality sensor 15 (not shown in the figure), an indoor air quality sensor 16 (not shown in the figure), an outlet air temperature sensor 18, a wind pressure sensor 19 and a controller 20. Among them, the outdoor air quality sensor 15, the indoor air quality sensor 16, the outlet air temperature sensor 18 and the wind pressure sensor 19 are collectively referred to as sensors.

[0114] The outdoor air quality sensor 15 is arranged on the outdoor side of the fresh air fan, and can detect the temperature, humidity, PM2.5, CO2 and VOC of the outdoor air, and can transmit the detection results to the controller 20.

[0115] The indoor air quality sensor 16 is arranged on the indoor side of the fresh air fan, and can detect the temperature, humidity, PM2.5, CO2 and VOC of the indoor air, and can transmit the detection results to the controller 20.

[0116] The air outlet temperature sensor 18 is disposed at the outlet of the air outlet chamber R1 , and is capable of detecting the temperature of the air flow discharged by the fresh air blower, and is capable of transmitting the detection result to the controller 20 .

[0117] The wind pressure sensor 19 is disposed at the outlet of the air outlet chamber R1 , and is capable of detecting the pressure of the air flow discharged by the fresh air fan, and is capable of transmitting the detection result to the controller 20 .

[0118] The controller 20 is arranged on the outside or inside of the chassis 1, and can control the opening / closing of each valve, the stopping / starting of each fan and heating device, and obtain the data of each sensor. The controller 20 can control each valve, heating device and fan with the air data obtained by each sensor, automatically switch to the appropriate operating conditions, automatically control the operating power of each fan and heating device, and obtain the required fresh air quality and temperature with precise energy control.

[0119] Fifth embodiment

[0120] like Fig.10 As shown, an embodiment of the present invention provides a method for controlling a fresh air fan in a near-zero energy building, comprising the following steps.

[0121] Step S1: The fresh air fan starts self-checking.

[0122] This step is used to check whether the opening and closing of each valve, the start and stop of each fan are smooth, and whether the air duct resistance of the fresh air fan and the feedback of each sensor are normal.

[0123] Preferably, this step also includes a sub-step: operating the fresh air fan under default operating conditions and default gear position.

[0124] The default operating conditions provided in the embodiments of the present invention are preset operating conditions, including heat exchange conditions, two-way bypass conditions, internal circulation conditions, and rapid defrosting conditions, etc., taking the above embodiments as an example. The default gear is the preset operating power of the fresh air fan 2 and the exhaust fan 3. The fan can operate at multiple powers, and different preset powers are different gears of the fan.

[0125] Step S2: the controller 20 obtains the air quality and temperature data from the outdoor air quality sensor 15 , the indoor air quality sensor 16 and the outlet air temperature sensor 18 .

[0126] This step is used to obtain indoor and outdoor air quality, including air temperature, humidity, PM2.5, CO2 and VOC.

[0127] Step S3: The controller 20 compares the obtained indoor and outdoor air quality parameters with the preset reference values. When the outdoor air quality is very poor, it jumps to step S4; when the outdoor air quality is very good and the outdoor temperature is more in line with the perceived comfort temperature than the indoor temperature, it jumps to step S5; when the outdoor temperature is extremely low, it jumps to step S6; when the indoor and outdoor air quality and temperature do not meet the above conditions, it jumps to step S7.

[0128] In the fresh air fan control method provided in the embodiment of the present invention, the judgment criteria for very poor outdoor air quality are, for example: outdoor PM2.5 concentration>500PPM, or outdoor VOC concentration>160μg / m3. The fresh air fan operates in an internal circulation mode.

[0129] Examples of criteria for outdoor temperature to be more in line with the perceived comfort temperature include: in summer, the outdoor temperature is 17-30°C and the outdoor temperature is less than the indoor temperature; or in winter, the outdoor temperature is 15-28°C and the outdoor temperature is greater than the indoor temperature. The fresh air blower operates in a two-way bypass mode.

[0130] An example of the judgment standard for extremely low outdoor temperature is: outdoor temperature ≤ -10°C. The fresh air fan operates in a rapid defrosting condition.

[0131] When the indoor and outdoor air quality and temperature do not meet the above conditions, the fresh air fan operates in heat exchange mode.

[0132] Step S4: the controller 20 controls the internal circulation valve 9, the fresh air bypass valve 11 and the return air bypass valve 12 to remain in the open state; the exhaust valve 4, the air inlet valve 5 and the exhaust fan 3 remain in the closed state, the fresh air fan 2 remains in the running state, and jumps to step S8.

[0133] The fresh air fan control method provided in the embodiment of the present invention enables the fresh air fan to operate in an internal circulation condition.

[0134] Step S5: The controller 20 controls the exhaust valve 4, the air inlet valve 5, the fresh air bypass valve 11 and the return air bypass valve 12 to remain in the open state, the internal circulation valve 9 to remain in the closed state, the fresh air fan 2 and the exhaust fan 3 to remain in the running state, and jumps to step S8.

[0135] The fresh air fan control method provided by the embodiment of the present invention enables the fresh air fan to operate in a two-way bypass condition.

[0136] Step S6: The controller 20 controls the exhaust valve 4, the air inlet valve 5, the fresh air bypass valve 11, the return air bypass valve 12 and the exhaust fan 3 to remain in a closed state, the internal circulation valve 9 to remain in an open state, and the fresh air fan 2 to remain in an operating state. After maintaining the set time, jump to step S7.

[0137] The fresh air fan control method provided in the embodiment of the present invention enables the fresh air fan to operate in a rapid defrosting condition for a set period of time (for example, 10 minutes) and then jump to a heat exchange condition to continue operating.

[0138] Step S7: The controller 20 controls the exhaust valve 4 and the air inlet valve 5 to remain open, the internal circulation valve 9, the fresh air bypass valve 11 and the return air bypass valve 12 to remain closed, the fresh air fan 2 and the exhaust fan 3 to remain in operation, and jumps to step S8.

[0139] The fresh air fan control method provided in the embodiment of the present invention enables the fresh air fan to operate in a heat exchange condition.

[0140] Preferably, this step also includes the following sub-steps:

[0141] S71: The controller 20 controls the preheating box 13 to maintain the running state according to the air outlet temperature and the set temperature, and jumps to step S8.

[0142] By using this sub-step, the fresh air fan can be operated in a preheating condition.

[0143] S72: The controller 20 controls the auxiliary heating box 14 to keep running according to the air outlet temperature and the set temperature, and jumps to step S8.

[0144] By utilizing this sub-step, the fresh air fan can be operated in auxiliary heating mode.

[0145] Step S8: the controller 20 obtains the wind pressure data from the wind pressure sensor 19 and calculates the actual air volume of the fresh air.

[0146] The new air blower control method provided in the embodiment of the present invention obtains the dynamic pressure P from the wind pressure sensor 19, and obtains the wind speed v by reverse deduction according to formula (1):

[0147] P = 0.5 × p × v2 (1)

[0148] Among them, P is the air dynamic pressure, p is the air density, and v is the wind speed.

[0149] According to formula (2), the calculated air volume Q is obtained:

[0150] Q=S×v×a (2)

[0151] Wherein, Q is the calculated air volume; S is the air outlet area; v is the wind speed; a is the measurement unit conversion coefficient, and in this embodiment, a=3600 is used as an example to convert the air volume per second into the air volume per hour.

[0152] Since there is a deviation between the calculated air volume Q and the actual air volume Q' calculated in the above method, it is necessary to test the actual air volume Q' in the laboratory. By statistically analyzing the data of the actual air volume Q' and the calculated air volume Q, the relationship coefficient δ and formula (3) between the two are obtained:

[0153] Q' = Q × δ (3)

[0154] Among them, Q' is the actual air volume and δ is the relationship coefficient.

[0155] Step S9: The controller 20 obtains the set air volume of the fresh air outlet and compares it with the actual air volume. When the actual air volume is greater than the set air volume, the fresh air fan 2 downshifts to reduce the air volume and jumps to step S8; when the actual air volume is equal to the set air volume, the fresh air fan 2 maintains the operating gear to maintain the air volume and jumps to step S2; when the actual air volume is less than the set air volume, the fresh air fan 2 upshifts to increase the air volume and jumps to step S8.

[0156] Each new air blower will have a limited air volume setting range according to product specifications when it leaves the factory. For example, the rated air volume is 350m 3 / h air volume products, the air volume setting range is 0~350m 3 / h. The fresh air fan obtains the actual air temperature and air volume according to the set air outlet temperature and air volume, and automatically adjusts the start and stop and power of each valve, fan and heating equipment to achieve the set value with the lowest energy consumption.

[0157] In summary, the fresh air fan control method provided in the embodiment of the present invention automatically controls the fresh air fan to operate in a suitable mode and gear by real-time monitoring of the outdoor air state, the indoor air state and the air volume state of the fresh air fan, and fully utilizes natural energy to reduce energy consumption as much as possible on the basis of meeting user needs. Accordingly, the fresh air fan provided in the embodiment of the present invention actively reduces wind resistance and energy loss through a unique two-way bypass structure. At the same time, various components such as air valves, pressure taking modules and built-in auxiliary heating boxes are added to the fresh air fan structure, and the operating conditions and power are adjusted through an intelligent electronic control system to further reduce the energy consumption of the fresh air fan.

[0158] It should be noted that the above embodiments are only examples, and the technical solutions of the various embodiments can be combined, all within the protection scope of the present invention.

[0159] It should be noted that the order of steps of the present invention can be changed according to actual needs, the order of the steps can be changed, and serial processing can be changed to parallel processing, which is not limited to the order of steps listed in the embodiments.

[0160] The directions or positional relationships indicated by the terms "front", "rear", "upper" and "lower" are based on the directions or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0161] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0162] The above is a detailed description of a fresh air fan control method and a fresh air fan for a near-zero energy building provided by the present invention. For a person skilled in the art, any obvious changes made to it without departing from the essence of the present invention will constitute an infringement of the patent right of the present invention and will bear corresponding legal responsibilities.

Claims

1. A new fan control method for a near-zero energy building, Features The following steps are involved: S1: Fresh air blower self-test after startup; S2: The controller obtains the air quality and temperature data from the outdoor air quality sensor, indoor air quality sensor and outlet air temperature sensor; S3: The controller compares the obtained indoor and outdoor air quality parameters with the preset reference values. When the outdoor air quality is very poor, the controller jumps to step S4; when the outdoor air quality is very good and the outdoor temperature is more in line with the body's comfortable temperature than the indoor temperature, the controller jumps to step S5; When the outdoor temperature is extremely low, jump to step S6; when the indoor and outdoor air quality and temperature do not meet the above conditions, jump to step S7; S4: the controller controls the internal circulation valve, the fresh air bypass valve and the return air bypass valve to remain in an open state, the exhaust valve, the air inlet valve and the exhaust fan to remain in a closed state, the fresh air fan to remain in a running state, and jumps to step S8; S5: The controller controls the exhaust valve, the inlet valve, the fresh air bypass valve and the return air bypass valve to remain in an open state, the internal circulation valve to remain in a closed state, the fresh air fan and the exhaust air fan to remain in an operating state, and jumps to step S8; S6: The controller controls the exhaust valve, the air inlet valve, the fresh air bypass valve, the return air bypass valve and the exhaust fan to remain in a closed state, the internal circulation valve to remain in an open state, and the fresh air fan to remain in an operating state, and after maintaining the set time, jumps to step S7; S7: the controller controls the exhaust valve and the inlet valve to remain in an open state, the internal circulation valve, the fresh air bypass valve and the return air bypass valve to remain in a closed state, the fresh air fan and the exhaust air fan to remain in a running state, and jumps to step S8; S8: The controller obtains wind pressure data from the wind pressure sensor and calculates the actual air volume of fresh air; S9: The controller obtains the set air volume of the fresh air outlet and compares it with the actual air volume. When the actual air volume is greater than the set air volume, the fresh air fan is downshifted to reduce the air volume, and the process jumps to step S8; when the actual air volume is equal to the set air volume, the fresh air fan maintains the running gear to maintain the air volume, and the process jumps to step S2; If the actual air volume is less than the set air volume, the fresh air fan will shift up to increase the air volume, and the process will jump to step S8.

2. The fresh air fan control method according to claim 1, Features The step S1 further includes: operating the fresh air fan under default operating conditions and default gear position.

3. The fresh air fan control method according to claim 1, Features The step S7 includes the following sub-steps: S71: The controller controls the preheating box to keep running according to the air outlet temperature and the set temperature, and jumps to step S8.

4. The fresh air fan control method according to claim 3, Features The step S7 also includes the following sub-steps: S72: The controller controls the auxiliary heating box to keep running according to the air outlet temperature and the set temperature, and jumps to step S8.

5. A fresh air fan for a near-zero energy building, using the fresh air fan control method according to any one of claims 1 to 4, Features It includes a chassis, a fresh air fan, an exhaust fan, a heat exchanger, an internal circulation valve, a fresh air bypass valve and a return air bypass valve; among which, The interior of the chassis is divided into an air outlet chamber, an exhaust chamber, an air inlet chamber, a heat exchanger chamber and a return air chamber which are independent of each other; The heat exchanger is fixed in the heat exchanger chamber, forming a passage passing through the air inlet chamber and the air outlet chamber, and a passage passing through the air return chamber and the air exhaust chamber; The internal circulation valve is switchably arranged between the air inlet chamber and the heat exchanger to achieve connection or disconnection between the air inlet chamber and the exhaust chamber; The fresh air bypass valve is fixed in the heat exchanger chamber to form a bypass channel that passes through the air inlet chamber and the air outlet chamber; The return air bypass valve is fixed in the heat exchanger chamber to form a bypass passage that passes through the return air chamber and the exhaust air chamber; The fresh air fan is arranged in the air outlet chamber, and the exhaust air fan is arranged in the exhaust chamber.

6. The fresh air blower according to claim 5, Features It also includes an exhaust valve and an inlet valve; wherein, The exhaust valve is arranged at the exhaust port of the exhaust chamber, and the exhaust fan exhausts air to the outdoors through the exhaust valve, and prevents the outdoor air from flowing back into the exhaust chamber; the air inlet valve is arranged at the air inlet of the air inlet chamber, and is used to connect and block the flow between the outdoor air and the air inlet chamber.

7. The fresh air blower according to claim 6, Features It also includes an outdoor air quality sensor, an indoor air quality sensor, an outlet air temperature sensor, a wind pressure sensor and a controller; wherein, The outdoor air quality sensor is arranged at the outdoor side of the fresh air fan; the indoor air quality sensor is arranged at the indoor side of the fresh air fan; the air outlet temperature sensor is arranged at the outlet of the air outlet chamber; the wind pressure sensor is arranged at the outlet of the air outlet chamber, and is used to detect the air flow pressure discharged by the fresh air fan; The controller is set at the outer side and the inner side of the chassis, and is used to control the working status of each valve and fan and obtain data from each sensor.

8. The fresh air blower according to claim 7, Features It also includes a preheating box and an auxiliary heating box; wherein, The preheating box is arranged in the air inlet chamber, and the auxiliary heating box is arranged in the air outlet chamber, and the operating state is controlled by the controller.

9. The fresh air blower according to claim 5, Features It also includes fresh air primary filter, return air primary filter and high efficiency filter; among them, The fresh air primary filter is arranged between the air inlet chamber and the heat exchanger, and between the air inlet chamber and the fresh air bypass valve; The return air primary filter is arranged between the return air chamber and the heat exchanger, and between the return air chamber and the return air bypass valve; The high efficiency filter is arranged between the heat exchanger and the air outlet chamber, and between the fresh air bypass valve and the air outlet chamber.

10. The fresh air blower according to claim 5, Features: The exhaust chamber is adjacent to the air inlet chamber, and the air outlet chamber is adjacent to the return air chamber; the heat exchanger chamber is located in the middle, the air outlet chamber and the exhaust chamber are located on both sides of the heat exchanger chamber, and the air inlet chamber and the return air chamber are also located on both sides of the heat exchanger chamber.

Images