Variable-channel fresh air handling unit

Abstract

The utility model provides a variable channel fresh air handling unit which comprises a unit body, a surface air cooler and a fan are sequentially arranged in the unit body in the airflow direction, the surface air cooler can heat or cool air passing through the surface air cooler, and the fan is used for sucking outdoor air into the unit body through an air inlet and discharging the outdoor air from an air outlet. A plurality of air valves are further arranged in the unit body and comprise the first air valve and the second air valve which are located on the upstream of the surface air coolers and the third air valve and the fourth air valve which are located on the downstream of the surface air coolers, and the surface air coolers comprise the second surface air cooler and the first surface air cooler. By selecting the air valves with different switches, fresh air passes through the second surface air cooler and the first surface air cooler at the same time and bypasses the second surface air cooler and / or the first surface air cooler, multi-channel change is achieved to change internal resistance of the unit body, the effect of saving energy consumption of a fan is achieved, the fresh air load and energy consumption are reduced while requirements are guaranteed, and the energy consumption is reduced. And only one air inlet is formed outside the unit main body, so that the appearance is more attractive.

Description

Technical Field

[0001] This utility model belongs to the field of air treatment technology, specifically relating to a variable channel fresh air handling unit. Background Technology

[0002] Fresh air handling units provide fresh air to indoor spaces, effectively regulating indoor air quality and ensuring the respiratory safety and thermal comfort of occupants. They work by filtering, heating, humidifying, and dehumidifying outdoor air before introducing it into the room. Internally, they typically include functional sections such as a filtration section, a heating / cooling section, and a humidification section. However, during transitional seasons, outdoor air temperature and humidity are more suitable, allowing fresh air to be introduced directly into the room without further heating or humidification treatment. In contrast, conventional fresh air handling units require fresh air to pass through a surface cooler during the air handling process, resulting in higher internal resistance, a larger system head, and the fan operating at high power for extended periods, leading to higher overall energy consumption.

[0003] To address the aforementioned technical issues, CN201220020284.7 discloses a bypass-type intelligent energy-saving fresh air unit. This unit has a second air inlet on the side wall between the surface cooler and the fan. The system can switch to the second air inlet as needed, bypassing the surface cooler, allowing fresh air to be directly delivered into the air supply duct via the fan, reducing system resistance and saving energy. The aforementioned patent, however, sets two air vents (including a primary air vent and a secondary air vent) on the outside of the unit, both directly connected to the outside atmosphere and arranged in parallel. On the one hand, the two vents are located on opposite sides of the unit, affecting the appearance; on the other hand, the parallel arrangement requires filters (including a pre-filter and a medium-efficiency filter) at both the primary and secondary air inlets, increasing both cost and maintenance workload. Utility Model Content

[0004] To address the technical problems existing in the prior art, this utility model provides a variable channel fresh air handling unit. By setting multiple air valves inside the unit body and selectively opening and closing different air valves, multiple channel changes can be achieved to change the internal resistance of the unit body, thereby saving fan energy consumption.

[0005] In this embodiment of the present invention, a variable channel fresh air handling unit includes a main body with an air inlet and an air outlet. Inside the main body, a surface cooler and a fan are sequentially arranged along the airflow direction. The surface cooler heats and cools the air passing through it. The fan draws outdoor air into the main body through the air inlet and discharges it through the air outlet. Multiple air valves are also provided inside the main body. These valves include a first and a second air valve connected in parallel upstream of the surface cooler, and a third and a fourth air valve connected in parallel downstream of the surface cooler. The surface cooler includes a second surface cooler and a first surface cooler. The first air valve, the second surface cooler, and the third air valve are located in the same ventilation path. The second air valve and the third air valve are located in the same ventilation path. The first air valve, the second surface cooler, the first surface cooler, and the fourth air valve are located in the same ventilation path. By controlling the opening and closing of the first air valve, the second air valve, the third air valve, and the fourth air valve, the fresh air entering the main body of the unit can be output from the air outlet after passing only through the second surface cooler, or only through the first surface cooler, or simultaneously through the second surface cooler and the first surface cooler, or simultaneously bypassing the second surface cooler and the first surface cooler.

[0006] Compared with the prior art, the beneficial effects of the superior technical solution of this utility model include:

[0007] 1. This utility model sets multiple air valves inside the main body of the unit and selects to open and close different air valves to achieve multi-channel changes to change the internal resistance of the main body of the unit, thereby saving the energy consumption of the fan. While ensuring the demand, it reduces the fresh air load and energy consumption. Compared with the existing technology that sets multiple air outlets outside the unit, this utility model only sets one air inlet outside the main body of the unit, which is more aesthetically pleasing. Moreover, only one set of filter needs to be set for one air inlet, which reduces the cost and the maintenance workload of the filter.

[0008] 2. This utility model divides the surface cooler into a second surface cooler and a first surface cooler that can work independently. When cooling, dehumidifying, or heating the air, the second surface cooler works first. Only when the second surface cooler cannot meet the requirements will the second and first surface coolers work simultaneously, which is more energy-efficient.

[0009] 3. Cold / hot water is introduced into the surface cooler and reheater through water circulation pipes to exchange heat with the air, thereby lowering / raising the fresh air temperature. The structure is simple, the circulating water can be reused, and it is energy-saving and environmentally friendly. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the main structure of a variable channel fresh air handling unit according to an embodiment.

[0011] Figure 2 yes Figure 1 AA section view diagram.

[0012] Figure 3 This is a hardware connection diagram of the controller in the embodiment.

[0013] The reference numerals in the accompanying drawings include: unit body 1, air inlet 2, air outlet 3, surface cooler 4, first surface cooler 41, second surface cooler 42, reheater 5, fan 6, filter 7, air valve 8, first air valve 81, second air valve 82, third air valve 83, fourth air valve 84, first partition 9, second partition 10, wet film humidification section 11, and electrostatic sterilization section 12. Detailed Implementation

[0014] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0015] This embodiment provides a variable channel fresh air handling unit, such as Figure 1 and Figure 2 As shown, in a preferred embodiment, the fresh air handling unit includes a main body 1 with an air inlet 2 and an air outlet 3. Inside the main body 1, a surface cooler 4 and a fan 6 are sequentially arranged along the airflow direction. The fan 6 draws outdoor air into the main body 1 through the air inlet 2 and exhausts it through the air outlet 3. The surface cooler 4 heats or cools the air passing through it to regulate the fresh air temperature. A filter 7 is also provided inside the main body 1, located between the air inlet 2 and the surface cooler 4. The filter 7 filters the outdoor air entering the main body 1. The structure and principle of the filter 7 are existing technologies, such as using a multi-stage air filter.

[0016] This utility model also provides multiple air valves 8 inside the main body 1 of the unit. The air valves 8 include a first air valve 81 and a second air valve 82 arranged in parallel upstream of the surface cooler 4, and a third air valve 83 and a fourth air valve 84 arranged in parallel downstream of the surface cooler 4. The surface cooler 4 includes a second surface cooler 42 and a first surface cooler 41. The first air valve 81, the second surface cooler 42 and the third air valve 83 are located in the same ventilation path. The second air valve 82 and the third air valve 83 are located in the same ventilation path. The first air valve 81, the second surface cooler 42, the first surface cooler 41 and the fourth air valve 84 are located in the same ventilation path. By controlling the opening and closing of the first air valve 81, the second air valve 82, the third air valve 83 and the fourth air valve 84, the fresh air entering the main body 1 of the unit can be output from the air outlet 3 after passing only through the second surface cooler 42, or only through the first surface cooler 41, or simultaneously through the second surface cooler 42 and the first surface cooler 41, or simultaneously bypassing the second surface cooler 42 and the first surface cooler 41.

[0017] Specifically, by opening the first air valve 81 and the third air valve 83, and closing the second air valve 82 and the fourth air valve 84, the fresh air entering the main body of the unit 1 is processed by the second surface cooler 42 and then output from the air outlet 3; by opening the second air valve 82 and the fourth air valve 84, and closing the first air valve 81 and the third air valve 83, the fresh air entering the main body of the unit 1 is processed by the first surface cooler 41 and then output from the air outlet 3; by opening the first air valve 81 and the fourth air valve 84, and closing the second air valve 82 and the third air valve 83, the fresh air entering the main body of the unit 1 is processed by the second surface cooler 42 and the first surface cooler 41 and then output from the air outlet 3; by opening the second air valve 82 and the third air valve 83, and closing the first air valve 81 and the fourth air valve 84, the fresh air entering the main body of the unit 1 simultaneously bypasses the second surface cooler 42 and the first surface cooler 41 and is output from the air outlet 3.

[0018] This invention, by installing multiple air valves 8 inside the main unit 1 and selectively opening and closing different air valves 8, creates multiple ventilation channels (i.e., multiple ventilation paths) inside the main unit 1. By selecting different ventilation channels, the fresh air inside the main unit 1 can pass only through the second surface cooler 42, or only through the first surface cooler 41, or simultaneously through the second surface cooler 42 and the first surface cooler 41, or simultaneously bypass the second surface cooler 42 and the first surface cooler 41. Thus, when the outside air is suitable, the fresh air entering the main unit 1 can bypass the second surface cooler 42 and / or the first surface cooler 41, reducing the internal resistance of the main unit 1, reducing the required system head, and saving energy consumption of the fan 6.

[0019] This utility model divides the surface cooler 4 into a second surface cooler 42 and a first surface cooler 41 that can work independently. When cooling, dehumidifying, or heating the air, the second surface cooler 42 takes priority. Only when the second surface cooler 42 cannot meet the requirements will the second surface cooler 42 and the first surface cooler 41 work simultaneously, which is more energy-efficient. Moreover, the second surface cooler 42 and the first surface cooler 41 are arranged one in front of the other. Compared with the second surface cooler 42 and the first surface cooler 41 being arranged one above the other, this solution can reduce the height of the main body 1 of the unit.

[0020] In this utility model, a first partition 9 and a second partition 10 are fixedly connected inside the main body 1 of the unit. The surface cooler 4 is located in the accommodating space formed by the first partition 9, the second partition 10 and the inner wall of the main body 1 of the unit. The first air valve 81 and the second air valve 82 are installed on the first partition 9, and the third air valve 83 and the third air valve 84 are installed on the second partition 10.

[0021] like Figure 2 As shown, in this embodiment, the first surface cooler 41 and the second surface cooler 42 are both inclined in the same direction. The first air valve 81 and the third air valve 83 are respectively located on both sides of the second surface cooler 42, and the second air valve 82 and the fourth air valve 84 are respectively located on both sides of the first surface cooler 41. For example, the main body 1 of the unit is a horizontal structure. The first partition 9 is located to the left of the second partition 10. The first air valve 81 and the second air valve 82 are located to the left of the surface cooler 4, the third air valve 83 and the fourth air valve 84 are located to the right of the surface cooler 4, and the second surface cooler 42 is located in front of the first surface cooler 41. The second surface cooler 42 is inclined from back to front from left to right, and the first surface cooler 41 and the second surface cooler 42 are arranged parallel to each other.

[0022] Preferably, the upper and lower ends of the second surface cooler 42 and the first surface cooler 41 are in contact with the inner wall of the unit body 1, respectively. The left and right ends of the second surface cooler 42 and the first surface cooler 41 are in contact with the first partition 9, the second partition 10 and the inner wall of the unit body 1 through connecting plates, so that each ventilation channel is independent of each other, the air flow does not interfere with each other, and the wind resistance is reduced.

[0023] In this utility model, the surface cooler 4 (including the second surface cooler 42 and the first surface cooler 41) is connected to the water circulation pipeline. The main unit 1 has two water circulation pipelines, one for transporting hot water and the other for transporting cold water. The connection method between the second surface cooler 42 and the first surface cooler 41 and the water circulation pipeline is existing technology and will not be described in detail here. Cold water is introduced into the surface cooler 4 through the water circulation pipeline to cool and dehumidify the air flowing through it, and hot water is introduced into the surface cooler 4 through the water circulation pipeline to heat the air flowing through it.

[0024] like Figure 1As shown, in another preferred embodiment, the main body 1 of the unit also includes a reheater 5 located between the surface cooler 4 and the fan 6. The reheater 5 is connected to a water circulation pipe, through which hot water is supplied to the reheater 5 to heat the air flowing through it. The connection method between the reheater 5 and the water circulation pipe is existing technology and will not be described in detail here. When the air temperature after cooling and dehumidification by the surface cooler 4 is too low, it can be heated by the reheater 5 to increase the air temperature.

[0025] like Figure 1 As shown, in another preferred embodiment, the main body 1 of the unit is further provided with a wet film humidification section 11 and / or an electrostatic sterilization section 12 located between the surface cooler 4 and the fan 6. Preferably, both the wet film humidification section 11 and the electrostatic sterilization section 12 are provided simultaneously, and the wet film humidification section 11 and the electrostatic sterilization section 12 are located downstream of the reheater 5. The air entering the main body 1 of the unit is first filtered by the filter 7, then the surface cooler 4 and the reheater 5 regulate the temperature and dehumidify it, and after being disinfected and sterilized by the electrostatic sterilization section 12, it is discharged into the room through the exhaust vent. In winter, the air is heated and then humidified by the wet film humidification section 11. In summer, after dehumidification, there is no need for the wet film humidification section 11 to humidify again. That is, the wet film humidification section 11 is turned on by default in winter and not turned on in summer. Of course, customers can also change the settings according to actual conditions.

[0026] like Figure 1 As shown, in another preferred embodiment, the main body 1 of the unit is a horizontal structure with two upper and lower layers, which is more compact and reduces the floor space. Specifically, the air inlet 2, the surface cooler 4, and the air valve 8 are located on the lower layer of the main body 1, while the reheater 5, the wet film humidification section 11, the electrostatic sterilization section 12, the fan 6, and the air outlet 3 are located on the upper layer of the main body 1. The top of the right end of the lower layer of the main body 1 is connected to the bottom of the right end of the upper layer of the main body 1, allowing air from the lower layer to enter the upper layer. Preferably, the air inlet 2 and the air outlet 3 are located on the same side of the main body 1, for example, both the air inlet 2 and the air outlet 3 are located on the left side of the main body 1. Depending on the actual situation, such as when ventilation is required for multiple rooms, multiple air outlets 3 can be provided. The air outlets 3 are connected to the rooms through air supply ducts, and the opening and closing of the air outlets 3 are controlled by valves.

[0027] In actual use, this fresh air handling unit is typically equipped with an outdoor temperature and humidity sensor (which can be installed in the air inlet box or air inlet duct) for measuring outdoor air temperature and humidity, and a supply air temperature and humidity sensor (which can be installed in the air supply box or air supply duct) for measuring the supply air temperature and humidity of the air supplied to the room. The signal output terminals of the outdoor temperature and humidity sensor and the supply air temperature and humidity sensor are connected to the input terminal of the controller. The control output terminal of the controller is connected to the enable terminal of each air valve 8, surface cooler 4, and reheater 5 to control the operation of the fresh air handling unit. A flow sensor for monitoring the flow rate of surface cooler 4 is also installed on the water circulation pipeline of surface cooler 4, and the signal output terminal of the flow sensor is connected to the controller.

[0028] When the fresh air handling unit is running, the controller can adjust the opening and closing of different air valves 8 according to different seasons and time periods, thereby reducing the internal resistance of the unit body 1 and achieving the effect of saving energy consumption of the fan 6. Specifically, the controller can control the opening and closing of the surface cooler 4 (including the second surface cooler 42 and the first surface cooler 41) and the reheater 5 according to the outdoor air temperature Tw and humidity dw measured by the outdoor temperature and humidity sensor, so that the supply air temperature Ts and supply air humidity ds are suitable. Specifically, the control logic of the fresh air handling unit of this utility model is as follows:

[0029] When the outdoor air temperature (Tw) and humidity (dw) both meet the comfort requirements of indoor occupants (i.e., Tw1 < Tw ≤ Tw2, dw1 < dw ≤ dw2), the first surface cooler 41, the second surface cooler 42, and the reheater 5 are all closed. The first air valve 81 and the fourth air valve 84 are closed, while the second air valve 82 and the third air valve 83 are open, and the fresh air handling unit operates in ventilation mode. Under the action of the fan 6, fresh outdoor air is filtered and purified before being delivered indoors. Recommended values ​​are: Tw1 = 16℃, Tw2 = 26℃, dw1 = 8g / kg, dw2 = 12g / kg.

[0030] When the outdoor air is cold (outdoor air temperature Tw is too low and humidity dw is suitable), i.e. Tw≤Tw1, dw1<dw≤dw2, the first air valve 81 and the third air valve 83 are opened, the second air valve 82 and the fourth air valve 84 are closed, hot water is introduced into the second surface cooler 42, and the fresh air unit operates in heating mode. The controller first adjusts the hot water flow rate of the second surface cooler 42 based on the supply air temperature Ts: when the supply air temperature Ts1 < Ts ≤ Ts2, the hot water flow rate of the second surface cooler 42 remains constant; when Ts ≤ Ts1, the hot water flow rate of the second surface cooler 42 is increased; when Ts > Ts2, the hot water flow rate of the second surface cooler 42 is decreased; when the second surface cooler 42 reaches its maximum hot water flow rate, and Ts ≤ Ts1, the second air valve 82 and the third air valve 83 are closed, and the first air valve 81 and the fourth air valve 84 are opened. Hot water is then introduced into both the first surface cooler 41 and the second surface cooler 42, with the second surface cooler 42 maintaining its maximum hot water flow rate. The controller adjusts the supply air temperature Ts by regulating the hot water flow rate of the first surface cooler 41. Under the action of the fan 6, fresh outdoor air is filtered, heated, and purified before being delivered into the room. Recommended values ​​are: Ts1 = 16℃, Ts2 = 26℃.

[0031] When the outdoor air is cold and dry (outdoor air temperature Tw is too low and humidity dw is too low), i.e. Tw≤Tw1, dw≤dw1, the wet film humidification section 11 is opened first, the first air valve 81 and the third air valve 83 are opened, the second air valve 82 and the fourth air valve 84 are closed, hot water is introduced into the second surface cooler 42, and the fresh air unit operates in heating mode. The controller first adjusts the hot water flow rate of the second surface cooler 42 based on the supply air temperature Ts: when the supply air temperature Ts1 < Ts ≤ Ts2, the hot water flow rate of the second surface cooler 42 remains constant; when Ts ≤ Ts1, the hot water flow rate of the second surface cooler 42 is increased; when Ts > Ts2, the hot water flow rate of the second surface cooler 42 is decreased; when the second surface cooler 42 reaches its maximum hot water flow rate, and Ts ≤ Ts1, the second air valve 82 and the third air valve 83 are closed, and the first air valve 81 and the fourth air valve 84 are opened. Hot water is then introduced into both the first surface cooler 41 and the second surface cooler 42, with the second surface cooler 42 maintaining its maximum hot water flow rate. The controller adjusts the supply air temperature Ts by regulating the hot water flow rate of the first surface cooler 41. Under the action of the fan 6, fresh outdoor air is filtered, heated, humidified, and purified before being delivered into the room. Recommended values ​​are: Ts1 = 16℃, Ts2 = 26℃.

[0032] When the outdoor air is in a warm and humid state (the outdoor air temperature Tw is suitable and the humidity dw is too high), that is, Tw1 < Tw ≤ Tw2, dw > dw2, the first air valve 81 and the third air valve 83 are opened, the second air valve 82 and the fourth air valve 84 are closed, the second surface cooler 42 is circulated with cold water, the fresh air unit operates in dehumidification mode, and the air entering the main body 1 of the unit is cooled and dehumidified by the second surface cooler 42 before being sent into the room. When the supply air humidity ds1 < ds ≤ ds2, the chilled water flow rate of the second surface cooler 42 remains constant; when the supply air humidity ds ≤ ds1, the chilled water flow rate of the second surface cooler 42 is reduced; when the supply air humidity ds > ds2, the chilled water flow rate of the second surface cooler 42 is increased; when the second surface cooler 42 reaches its maximum chilled water flow rate, and ds > ds2, the second air valve 82 and the third air valve 83 are closed, and the first air valve 81 and the fourth air valve 84 are opened. Chilled water flows into both the first surface cooler 41 and the second surface cooler 42, with the second surface cooler 42 maintaining its maximum chilled water flow rate. The controller adjusts the supply air humidity ds by regulating the chilled water flow rate of the first surface cooler 41. The controller then determines whether the reheater 5 should be turned on based on the supply air temperature Ts: when Ts1 < Ts ≤ Ts2, the reheater 5 remains closed; when Ts ≤ Ts1, the reheater 5 is turned on, and hot water is introduced into it to increase the supply air temperature Ts. Recommended values: ds1=8g / kg, ds2=12g / kg.

[0033] When the outdoor air is in a high temperature and humidity state (outdoor air temperature Tw is too high and humidity dw is too high), that is, Tw>Tw2, dw>dw2, the first air valve 81 and the third air valve 83 are opened, the second air valve 82 and the fourth air valve 84 are closed, the second surface cooler 42 is supplied with chilled water, and the fresh air unit operates in cooling mode. The controller adjusts the chilled water flow rate of the second surface cooler 42 according to the supply air temperature Ts: when the supply air temperature Ts1 < Ts ≤ Ts2 and the supply air humidity ds1 < ds ≤ ds2, the chilled water flow rate of the second surface cooler 42 remains unchanged; when Ts > Ts2 or ds > ds2, the chilled water flow rate of the second surface cooler 42 is increased; when Ts ≤ Ts1 and ds ≤ ds1, the chilled water flow rate of the second surface cooler 42 is decreased; when the second surface cooler 42 reaches the maximum chilled water flow rate, and Ts > Ts2 or ds > ds2, the second air valve 82 and the third air valve 83 are closed, and the first air valve 81 and the fourth air valve 84 are opened. Both the first surface cooler 41 and the second surface cooler 42 are supplied with chilled water. The second surface cooler 42 maintains the maximum chilled water flow rate, and the controller adjusts the supply air humidity ds by adjusting the chilled water flow rate of the first surface cooler 41. The controller then determines whether the reheater 5 should be turned on based on the supply air temperature ts: when Ts1 < Ts ≤ Ts2, the reheater 5 is kept off; when Ts ≤ Ts1, the reheater 5 is turned on and hot water is introduced into it to increase the supply air temperature Ts.

[0034] The aforementioned dehumidification mode and cooling mode both involve dehumidification and cooling at the same time, which can be collectively referred to as cooling and dehumidification mode. The air humidity is adjusted by first introducing cold water into the surface cooler 4 (including the first surface cooler 41 and the second surface cooler 42), and the air temperature will also drop at the same time. After adjusting the air humidity to a suitable range, it is then checked whether the air temperature is too low. If the air temperature is too low, hot water needs to be introduced into the reheater 5 to heat the air and raise the temperature.

[0035] The control logic of the fresh air handling unit of this utility model can be implemented through the connection of comparators, AND gates, and NOT gates, specifically as follows: Figure 3 As shown, the controller includes a first comparator, a second comparator, a third comparator, a fourth comparator, a fifth comparator, a sixth comparator, a seventh comparator, an eighth comparator, a ninth comparator, several AND gates, several NOT gates, and several OR gates. Specifically, digital comparators are preferred; if analog comparators are used, they must be connected via analog-to-digital conversion and AND gate circuits.

[0036] The first input terminal of the first comparator is connected to the outdoor air temperature (Tw) output terminal of the outdoor temperature and humidity sensor, and the second input terminal of the first comparator is connected to the output terminal of the outdoor air low temperature threshold (Tw1) memory. The first input terminal of the second comparator is connected to the outdoor air temperature (Tw) output terminal of the outdoor temperature and humidity sensor, and the second input terminal of the second comparator is connected to the output terminal of the outdoor air high temperature threshold (Tw2) memory. The first input terminal of the third comparator is connected to the outdoor air humidity (dw) output terminal of the outdoor temperature and humidity sensor, and the second input terminal of the third comparator is connected to the output terminal of the outdoor air low humidity threshold (dw1) memory. The first input terminal of the fourth comparator is connected to the outdoor air humidity (dw) output terminal of the outdoor temperature and humidity sensor, and the second input terminal of the fourth comparator is connected to the output terminal of the outdoor air high humidity threshold (dw2) memory. Preferably, a digital sensor is used. If an analog sensor is used and the comparator is a digital comparator, it can be first converted from analog to digital and then connected to the digital comparator.

[0037] The output of the first comparator (outputting a high level when Tw1 < Tw) is connected to the first input of the first AND gate; the output of the second comparator (outputting a high level when Tw2 < Tw) is connected to the second input of the first AND gate through an NOT gate; the output of the third comparator (outputting a high level when dw1 < dw) is connected to the first input of the second AND gate; and the output of the fourth comparator (outputting a high level when dw2 < dw) is connected to the second input of the second AND gate through an NOT gate.

[0038] The output of the first comparator is connected to the first input of the third AND gate via a NOT gate. The output of the third comparator is connected to the second input of the third AND gate via a NOT gate. The output of the third AND gate is connected to the opening terminals of the first and third air valves, the closing terminals of the second and fourth air valves, the hot water supply terminal of the second surface cooler, and the start terminal of the wet film humidification section 11.

[0039] The output of the first AND gate is connected to the first input of the fourth AND gate, the output of the fourth comparator is connected to the second input of the fourth AND gate, and the output of the fourth AND gate is connected to the open terminals of the first and third air valves, the closed terminals of the second and fourth air valves, and the cold water supply terminal of the second surface cooler.

[0040] The output of the first AND gate is connected to the first input of the fifth AND gate, the output of the second AND gate is connected to the second input of the fifth AND gate, and the output of the fifth AND gate is connected to the open terminals of the second and third air valves, the closed terminals of the first and fourth air valves, and the closed terminals of the first and second surface coolers.

[0041] The output of the first comparator is connected to the first input of the sixth AND gate via a NOT gate. The output of the second AND gate is connected to the second input of the sixth AND gate. The output of the sixth AND gate is connected to the open end of the wet film humidification section, the open ends of the first and third air valves, the closed ends of the second and fourth air valves, and the hot water supply end of the second surface cooler.

[0042] The output of the second comparator is connected to the first input of the seventh AND gate, the output of the fourth comparator is connected to the second input of the seventh AND gate, and the output of the seventh AND gate is connected to the open terminals of the first and third air valves, the closed terminals of the second and fourth air valves, and the cold water supply terminal of the second surface cooler.

[0043] The first input terminal of the fifth comparator is connected to the air supply temperature (Ts) output terminal of the air supply temperature and humidity sensor, and the second input terminal of the fifth comparator is connected to the output terminal of the air supply low temperature threshold (Ts1) memory. The first input terminal of the sixth comparator is connected to the air supply temperature (Ts) output terminal of the air supply temperature and humidity sensor, and the second input terminal of the sixth comparator is connected to the output terminal of the air supply high temperature threshold (Ts2) memory. The first input terminal of the seventh comparator is connected to the air supply humidity (ds) output terminal of the air supply temperature and humidity sensor, and the second input terminal of the seventh comparator is connected to the output terminal of the air supply low humidity threshold (ds1) memory. The first input terminal of the eighth comparator is connected to the air supply humidity (dw) output terminal of the air supply temperature and humidity sensor, and the second input terminal of the eighth comparator is connected to the output terminal of the air supply high humidity threshold (ds2) memory. The first input terminal of the ninth comparator is connected to the flow output terminal of the flow sensor, and the second input terminal of the ninth comparator is connected to the output terminal of the maximum flow threshold memory of the second surface cooler.

[0044] The output of the fifth comparator (high level when Ts1 < Ts) is connected to the first input of the eighth AND gate; the output of the sixth comparator (high level when Ts2 < Ts) is connected to the second input of the eighth AND gate through a NOT gate; the output of the seventh comparator (high level when ds1 < ds) is connected to the first input of the ninth AND gate; and the output of the eighth comparator (high level when ds2 < ds) is connected to the second input of the ninth AND gate through a NOT gate.

[0045] The output of the fifth comparator is connected to the first input of the tenth AND gate via an NOT gate. The output of the ninth comparator (which outputs a high level when the real-time flow rate of the second surface cooler is greater than the maximum flow rate threshold of the second surface cooler) is connected to the second input of the tenth AND gate. The output of the eighth AND gate is connected to the first input of the first OR gate, and the output of the ninth AND gate is connected to the second input of the first OR gate. The output of the sixth comparator is connected to the first input of the second OR gate, and the output of the eighth comparator is connected to the second input of the second OR gate. The output of the ninth comparator is connected to the first input of the eleventh AND gate, and the output of the second OR gate is connected to the second input of the eleventh AND gate.

[0046] The output of the first comparator is connected to the first input of the seventeenth AND gate (not shown in the figure). The output of the NOT gate connected to the output of the fourth comparator is connected to the second input of the seventeenth AND gate. The output of the seventeenth AND gate is connected to the first input of the twelfth AND gate. The output of the NOT gate connected to the output of the fifth comparator is connected to the second input of the twelfth AND gate. The output of the seventeenth AND gate is connected to the first input of the thirteenth AND gate. The output of the sixth comparator is connected to the second input of the thirteenth AND gate.

[0047] The output of the fourth AND gate is connected to the first input of the fourteenth AND gate, and the output of the NOT gate, which is connected to the output of the seventh comparator, is connected to the second input of the fourteenth AND gate. The fourteenth AND gate (reduces the cold water flow rate of the surface cooler 2); the output of the fourth AND gate is connected to the first input of the eighteenth AND gate (not shown in the figure), and the output of the eighth comparator is connected to the second input of the eighteenth AND gate. The eighteenth AND gate (increases the cold water flow rate of the surface cooler 2).

[0048] The output of the fourth AND gate is connected to the first input of the nineteenth AND gate, and the output of the eighth AND gate is connected to the second input of the nineteenth AND gate. The output of the fourth AND gate is connected to the first input of the twentieth AND gate, and the output of the NOT gate, which is connected to the output of the fifth comparator, is connected to the second input of the twentieth AND gate.

[0049] The output of the second OR gate is connected to the first input of the fifteenth AND gate, and the output of the seventh AND gate is connected to the second input of the fifteenth AND gate. The fifteenth AND gate (increases the cold water flow rate).

[0050] The output of the seventh AND gate is connected to the first input of the sixteenth AND gate. The output of the NOT gate, which is connected to the output of the fifth comparator, is connected to the second input of the sixteenth AND gate. The output of the NOT gate, which is connected to the output of the seventh comparator, is connected to the third input of the sixteenth AND gate. The sixteenth AND gate (reduces the cold water flow rate).

[0051] The output of the seventh AND gate is connected to the first input of the twenty-first AND gate, and the output of the eighth AND gate is connected to the second input of the twenty-first AND gate. The twenty-first AND gate keeps the reheat section water valve closed. The output of the seventh AND gate is connected to the first input of the twenty-second AND gate, and the output of the NOT gate, which is connected to the output of the fifth comparator, is connected to the second input of the twenty-second AND gate. The twenty-second AND gate opens the reheat section water valve.

[0052] The output of the twelfth AND gate is connected to the hot water flow rate increase control terminal of the second surface cooler; the output of the thirteenth AND gate is connected to the hot water flow rate decrease control terminal of the second surface cooler; the output of the fourteenth AND gate is connected to the cold water flow rate decrease control terminal of the second surface cooler; and the output of the eighteenth AND gate is connected to the cold water flow rate increase control terminal of the second surface cooler.

[0053] The output terminals of the nineteenth and twenty-first AND gates are connected to the stop terminal of the reheater, respectively, while the output terminals of the twentieth and twenty-second AND gates are connected to the start terminal of the reheater, respectively.

[0054] The output of the tenth AND gate is connected to the open terminals of the first and fourth air valves, the closed terminals of the second and third air valves, the maximum hot water flow control terminal of the second surface cooler, and the hot water flow control terminal of the first surface cooler. The output of the eleventh AND gate is connected to the open terminals of the first and fourth air valves, the closed terminals of the second and third air valves, the maximum cold water flow control terminal of the second surface cooler, and the cold water flow control terminal of the first surface cooler.

[0055] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A variable channel fresh air handling unit, comprising a main body having an air inlet and an air outlet, wherein a surface cooler and a fan are sequentially arranged inside the main body along the airflow direction, the surface cooler being capable of heating or cooling the air passing through it, and the fan being used to draw outdoor air into the main body through the air inlet and discharge it through the air outlet, characterized in that... ； Multiple air valves are also installed inside the main body of the unit. The air valves include a first air valve and a second air valve connected in parallel upstream of the surface cooler, and a third air valve and a fourth air valve connected in parallel downstream of the surface cooler. The surface cooler includes a second surface cooler and a first surface cooler. The first air valve, the second surface cooler, and the third air valve are located in the same ventilation path. The second air valve and the third air valve are located in the same ventilation path. The second air valve, the first surface cooler, and the fourth air valve are located in the same ventilation path. By controlling the opening and closing of the first air valve, the second air valve, the third air valve, and the fourth air valve, the fresh air entering the main body of the unit can be output from the air outlet after passing only through the second surface cooler, or only through the first surface cooler, or simultaneously through the second surface cooler and the first surface cooler, or simultaneously bypassing the second surface cooler and the first surface cooler.

2. The variable channel fresh air handling unit according to claim 1, characterized in that, The main body of the unit is fixedly connected to a first partition and a second partition. The surface cooler is located in the accommodating space formed by the first partition, the second partition and the inner wall of the main body of the unit. The first air valve and the second air valve are installed on the first partition, and the third air valve and the fourth air valve are installed on the second partition.

3. A variable channel fresh air handling unit according to claim 1, characterized in that, The first and second surface coolers are both inclined in the same direction. The first and third air valves are respectively located on both sides of the second surface cooler. The second and fourth air valves are respectively located on both sides of the first surface cooler.

4. A variable channel fresh air handling unit according to claim 1, characterized in that, The unit also has a filter located between the air inlet and the surface cooler inside.

5. A variable channel fresh air handling unit according to claim 1, characterized in that, The surface cooler is connected to a water circulation pipeline. Cold water is introduced into the surface cooler through the water circulation pipeline to cool and dehumidify the air flowing through it. Hot water is introduced into the surface cooler through the water circulation pipeline to heat and raise the temperature of the air flowing through it.

6. A variable channel fresh air handling unit according to any one of claims 1-5, characterized in that, The main body of the unit also has a reheater located between the surface cooler and the fan.

7. A variable channel fresh air handling unit according to claim 6, characterized in that, The reheater is connected to a water circulation pipeline, through which hot water is supplied to the reheater to heat the air flowing through it.

8. A variable channel fresh air handling unit according to claim 6, characterized in that, The main body of the unit is a double-layer horizontal structure. The air inlet, surface cooler and air valve are located on the lower layer of the main body of the unit, and the reheater, fan and air outlet are located on the upper layer of the main body of the unit. The air inlet and air outlet are located on the same side of the main body of the unit.

9. A variable channel fresh air handling unit according to any one of claims 1-5, characterized in that, The main body of the unit is also equipped with a wet film humidification section and / or an electrostatic sterilization section located between the surface cooler and the fan.

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