A fresh air system and a regulation method

Abstract

The application discloses a fresh air system and a regulation and control method. The fresh air system comprises a regulation and control device and a fresh air unit arranged outdoors. The fresh air unit comprises a mixing cavity and a main fan for conveying outdoor fresh air to the mixing cavity. The mixing cavity is in communication with the indoor environment through a return air pipe and a fresh air pipe respectively. The return air pipe is used for collecting indoor return air, and the indoor return air is mixed with the outdoor fresh air in the mixing cavity. The regulation and control device comprises an adjustment controller, an indoor sensor group and an outdoor sensor group. The adjustment controller controls the fresh air unit to operate in a predetermined operation mode according to air quality parameters collected by the indoor sensor group and the outdoor sensor group. The air quality parameters comprise the temperature, humidity and / or carbon dioxide concentration of air. The fresh air system provided by the application can be used in cooperation with a radiation air conditioner, and is helpful to improve indoor air quality and reduce energy consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning, in particular to a fresh air system and a regulation method. BACKGROUND

[0002] Housing is one of the most basic production and living materials for human survival and development. China's housing construction is accelerating, the scale of housing supply is continuously increasing, and the living conditions of residents have improved significantly. With the advancement of urbanization and the improvement of living standards, households have increasingly high demands for the health, comfort and quality of building environments. The domestic consumption demand for building products has shifted from quantity to quality. Radiant air conditioning, with its uniform temperature and energy-saving and environmentally friendly advantages, is widely used in high-end residences, nursing homes and office buildings, etc. In a radiant air-conditioned residence, a fresh air system plays a key role. In order to meet the energy-saving design standards, buildings must have good air tightness and thermal insulation performance as the quality of the residence improves. Indoor and outdoor air exchange needs the support of mechanical systems, while ensuring sufficient fresh air volume. The fresh air system not only affects indoor air quality, but also affects the user's thermal and humid environment perception. In actual projects, the fresh air system designed according to the existing standard system often faces problems of high investment and poor effect in the design of radiant air conditioning for high-end residences (such as science and technology residences). During the fresh air treatment process, the delivery and organization of the fresh air treatment process consume a certain amount of energy, and the high-quality residence envelope structure needs to have good thermal insulation performance, which significantly increases the energy consumption ratio of the fresh air system, sometimes even more than half.

[0003] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the background of the present application and should not be regarded as an acknowledgment or any form of suggestion that this information forms prior art that is publicly known. SUMMARY

[0004] The purpose of the present application is to provide a fresh air system and a regulation method, which can be used in cooperation with existing radiant air conditioning, helping to reduce energy consumption and achieve the goal of building energy saving and carbon reduction.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solution:

[0006] On the one hand, the present application provides a fresh air system, comprising a regulation device and a fresh air unit arranged outdoors;

[0007] The fresh air unit comprises a mixing cavity and a main fan for delivering outdoor fresh air to the mixing cavity;

[0008] The mixing cavity is in communication with the indoor environment through a return air pipe and a fresh air pipe, respectively, the return air pipe is used to collect indoor return air, and the indoor return air and the outdoor fresh air are mixed in the mixing cavity;

[0009] The control device includes a control unit, an indoor sensor group, and an outdoor sensor group; the control unit controls the fresh air handling unit to operate in a predetermined operating mode based on the air quality parameters collected by the indoor and outdoor sensor groups.

[0010] The air quality parameters include air temperature, humidity, and / or carbon dioxide concentration.

[0011] Furthermore, an adjustable air valve is installed on the return air duct, and the regulating controller adjusts the opening of the air valve and / or the operating power of the main fan according to the collected air quality parameters.

[0012] Furthermore, the fresh air unit also includes a filter for filtering the mixed air output from the mixing chamber.

[0013] Furthermore, the outdoor sensor group includes an outdoor fresh air temperature and humidity sensor located at the air outlet of the main fan, a return air temperature and humidity sensor located at the air outlet of the return air duct, and / or a mixed air temperature and humidity sensor located at the air outlet of the mixing chamber.

[0014] The indoor sensor group also includes an indoor temperature and humidity sensor, an indoor carbon dioxide sensor, and / or a radiant panel temperature sensor attached to the ceiling of the indoor radiant air conditioner.

[0015] The regulating controller adjusts the operating power of the main fan according to the signal collected by the temperature sensor of the radiant panel, so that the surface temperature of the radiant panel is not lower than the dew point;

[0016] The regulating controller is connected to the indoor exhaust fan via a signal. Based on the signal collected by the indoor carbon dioxide sensor, it adjusts the opening degree of the air valve, the operating power of the main fan, and / or the operating power of the indoor exhaust fan.

[0017] Furthermore, the control device also includes a human-machine interface panel, through which users can set the operating mode of the fresh air system and the triggering conditions for various operating modes, including threshold values ​​for air quality parameters.

[0018] Furthermore, the fresh air handling unit also includes a compressor, a condenser, an expansion valve, and an evaporator. When the fresh air handling unit operates in dehumidification mode to condense and dehumidify the air supplied to the room, the compressor, condenser, expansion valve, and evaporator are connected in sequence. When the fresh air handling unit operates in auxiliary heating mode to auxiliary heat the air supplied to the room, the compressor, evaporator, condenser, and expansion valve are connected in sequence.

[0019] In another aspect, this application provides a method for regulating a fresh air system, the method comprising the following steps:

[0020] The system collects indoor air temperature data and, in response to an indoor air temperature exceeding a set summer indoor temperature limit, triggers summer operating conditions, including:

[0021] Collect indoor air humidity;

[0022] In response to the indoor air humidity being higher than the set upper limit of indoor air humidity, the fresh air unit is controlled to operate in dehumidification mode;

[0023] In response to the indoor air humidity being lower than the set lower limit of indoor air humidity and the indoor carbon dioxide concentration being higher than the set upper limit of indoor carbon dioxide concentration, the fresh air unit is controlled to operate in ventilation mode;

[0024] In response to the indoor air humidity being between the set upper limit and lower limit of indoor air humidity, and the indoor carbon dioxide concentration not exceeding the set upper limit of indoor carbon dioxide concentration, the fresh air unit is controlled to enter a dormant state.

[0025] And / or,

[0026] The control method includes the following steps:

[0027] The system collects indoor air temperature data and triggers winter operation mode when the indoor air temperature is lower than the set winter indoor temperature limit but higher than the set fresh air unit operating temperature limit, including:

[0028] Collect outdoor air temperature;

[0029] In response to the outdoor air temperature being higher than the set winter indoor temperature limit, the fresh air unit is controlled to operate in ventilation mode;

[0030] In response to the outdoor air temperature not being higher than the set winter indoor temperature limit, the fresh air handling unit is controlled to operate in auxiliary heating mode to assist the indoor radiant air conditioning for heating.

[0031] And / or,

[0032] The control method includes the following steps:

[0033] The system collects indoor air temperature data and, in response to the indoor air temperature falling between a set upper limit for summer indoor temperature and a lower limit for winter indoor temperature, triggers transitional season operating conditions, including:

[0034] Collect indoor air humidity;

[0035] In response to the indoor air humidity being higher than the set upper limit of indoor air humidity, the fresh air unit is controlled to operate in dehumidification mode;

[0036] In response to the indoor air humidity not exceeding the set indoor air humidity limit, the fresh air unit is controlled to operate in ventilation mode;

[0037] In response to the indoor air humidity being between the set upper and lower limits of indoor air humidity, the fresh air unit is controlled to enter a sleep state.

[0038] Furthermore, during transitional season operation, the control of the fresh air handling unit to operate in dehumidification mode includes:

[0039] Turn on the main fan in the fresh air handling unit;

[0040] Adjust the opening of the return air duct valve according to the humidity of the outdoor fresh air and the indoor return air, thereby changing the mixing ratio of outdoor fresh air and indoor return air to regulate the indoor air humidity.

[0041] Furthermore, under summer operating conditions, the control of the fresh air handling unit to operate in dehumidification mode includes:

[0042] The high-temperature, low-pressure refrigerant gas is compressed by the compressor in the fresh air handling unit to obtain high-temperature, high-pressure refrigerant gas;

[0043] The high-temperature and high-pressure refrigerant gas is cooled by the condenser in the fresh air unit to obtain medium-temperature and high-pressure refrigerant gas.

[0044] The expansion valve in the fresh air handling unit throttles and reduces the pressure of the medium-temperature, high-pressure refrigerant gas to obtain a low-temperature, low-pressure refrigerant gas.

[0045] The evaporator in the fresh air handling unit uses low-temperature, low-pressure refrigerant gas to condense and dehumidify the air delivered to the room. The high-temperature, low-pressure refrigerant gas generated after heat exchange re-enters the compressor, thus achieving cyclic dehumidification.

[0046] Furthermore, the method also includes:

[0047] Collect indoor carbon dioxide concentration;

[0048] In response to indoor carbon dioxide concentration exceeding the set upper limit, the system reduces indoor return air and increases the operating power of the main fan and indoor exhaust fan.

[0049] In response to the indoor carbon dioxide concentration being lower than the set indoor carbon dioxide concentration lower limit, the indoor return air is increased and the operating power of the main fan and indoor exhaust fan is reduced.

[0050] In response to the indoor carbon dioxide concentration being between the set upper and lower limits of indoor carbon dioxide concentration, the system increases indoor return air and reduces the operating power of the main fan and indoor exhaust fan.

[0051] Compared with the prior art, the beneficial effects achieved by this application are as follows:

[0052] The fresh air system provided in this application is equipped with a return air duct for collecting indoor return air. Under certain operating conditions, the outdoor fresh air delivered by the main fan and the indoor return air can be mixed in the mixing chamber, thereby reducing the amount of air processed by the fresh air system to be delivered to the indoor environment, thus improving energy utilization and reducing energy consumption. Under certain operating conditions, the fresh air system can work with radiant air conditioning to adjust the temperature, humidity and carbon dioxide concentration of the indoor air, thereby improving indoor air quality. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This is a schematic diagram of the structure of the fresh air system provided in this application in some embodiments;

[0055] Figure 2 This is a circuit diagram of the control device in the fresh air system provided in this application;

[0056] Explanation of reference numerals in the attached figures:

[0057] 1-Main fan; 2-Outdoor fresh air temperature and humidity sensor; 3-Return air temperature and humidity sensor; 4-Mixing chamber; 5-Air valve; 6-Mixed air temperature and humidity sensor; 7-Filter; 8-Fresh air unit; 10-Regulator; 11-Human machine interface panel; 12-Radiant panel temperature sensor; 13-Carbon dioxide sensor; 14-Indoor temperature and humidity sensor; 15-Exhaust fan. Detailed Implementation

[0058] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use.

[0059] Example 1

[0060] An embodiment provides a fresh air system, mainly including a control device and a fresh air unit 8 installed outdoors. For example... Figure 1As shown, the fresh air unit 8 includes a mixing chamber 4 and a main fan 1. The main fan 1 is used to supply outdoor fresh air to the mixing chamber 4. A return air duct 3 is also connected to the mixing chamber 4, through which indoor return air can be collected. The indoor return air and outdoor fresh air can be mixed within the mixing chamber 4 to form mixed air. The mixing chamber 4 is also connected to the indoor environment through a fresh air duct, used to deliver the treated mixed air into the room.

[0061] The control device includes a control unit 10, an indoor sensor group, and an outdoor sensor group; the control unit 10 controls the fresh air unit 8 to operate in a predetermined operating mode based on the air quality parameters collected by the indoor sensor group and the outdoor sensor group; wherein, the air quality parameters include air temperature, humidity, and / or carbon dioxide concentration.

[0062] In summary, the fresh air system provided in this embodiment is equipped with a return air duct 3 for collecting indoor return air. Under certain operating conditions, the outdoor fresh air delivered by the main fan 1 and the indoor return air can be mixed in the mixing chamber, thereby reducing the amount of air processed by the fresh air system to be delivered to the indoor environment, thus improving energy utilization and reducing energy consumption.

[0063] In some embodiments, an adjustable air valve 5 is installed on the return air duct 3. The regulating controller 10 can adjust the return air volume of the indoor return air by adjusting the opening of the air valve 5 according to the collected air quality parameters, thereby changing the mixing ratio of indoor return air and outdoor fresh air to achieve the air quality expected by the user more efficiently and accurately.

[0064] It should be understood that, in order to change the mixing ratio of indoor return air and outdoor fresh air in the mixing chamber 4, the operating power of the main fan 1 can be adjusted, and the mixing ratio can be changed by increasing or decreasing the supply volume of outdoor fresh air; or the mixing ratio can be changed more quickly by combining the adjustment of the opening of the air valve 5 and the operating power of the main fan 1.

[0065] In some embodiments, the fresh air handling unit 8 provided in this application further includes a filter 7 for filtering the mixed air output from the mixing chamber 4. In ventilation mode, the fresh air handling unit 8 does not need to perform temperature and humidity adjustment on the mixed air; at this time, the mixed air can be delivered to the room after being filtered only by the filter 7.

[0066] In some embodiments, the outdoor sensor group includes an outdoor fresh air temperature and humidity sensor 2 located at the air outlet of the main fan 1, a return air temperature and humidity sensor located at the air outlet of the return air duct 3, and / or a mixed air temperature and humidity sensor 6 located at the air outlet of the mixing chamber; the indoor sensor group includes an indoor temperature and humidity sensor 14, an indoor carbon dioxide sensor 13, and / or a radiant panel temperature sensor 12 attached to the ceiling of the indoor radiant air conditioner.Figure 2 As shown, each sensor in the outdoor sensor group and the indoor sensor group is connected to a different signal input terminal of the regulating controller 10.

[0067] The outdoor fresh air temperature and humidity sensor 2 detects the outdoor air temperature and humidity, while the indoor temperature and humidity sensor 14 detects the indoor air temperature and humidity. The controller 10 controls the operating mode of the fresh air handling unit 8 by comparing the outdoor and indoor air temperatures. For example, in winter operation, when the outdoor air temperature is higher than the indoor air temperature, the fresh air handling unit 8 can be operated in ventilation mode to increase the indoor temperature or assist the indoor radiant air conditioner in quickly raising the indoor temperature. As another example, if the current indoor air humidity is higher than the user-set upper limit, and the outdoor air humidity is lower than the indoor air humidity, the fresh air handling unit 8 can be operated in dehumidification mode, adjusting the indoor air humidity by regulating the mixing ratio of outdoor fresh air and indoor return air.

[0068] Carbon dioxide concentration is also an important indicator for measuring indoor air quality. The regulating controller 10 can detect the carbon dioxide concentration in the indoor air using the indoor carbon dioxide sensor 13, compare the detected carbon dioxide concentration with the user-set carbon dioxide concentration threshold, and adjust the mixing ratio of indoor return air and outdoor fresh air based on the comparison result. For example, when the carbon dioxide concentration in the indoor air exceeds the user-set upper limit, it indicates that the return air volume of the indoor air should be reduced or the outdoor fresh air supply volume should be increased. The regulating controller 10 can increase the operating power of the main fan 1 and / or decrease the opening of the damper 5.

[0069] In some embodiments of this application, in order to improve indoor air quality as quickly as possible, the regulating controller 10 is also connected to the indoor exhaust fan 15 by signal, and adjusts the opening of the air valve 5, the operating power of the main fan 1 and / or the operating power of the indoor exhaust fan 15 according to the signal collected by the indoor carbon dioxide sensor 13.

[0070] To prevent water vapor in the air from condensing and causing condensation on the surface of the radiant panel, the regulating controller 10 can also adjust the operating power of the main fan 1 based on the signal collected by the radiant panel temperature sensor 12, so that the surface temperature of the radiant panel is not lower than the dew point.

[0071] In some embodiments, the control device further includes a human-machine interface panel 11, through which users can set the operating mode of the fresh air system and the triggering conditions for various operating modes, including threshold values ​​for air quality parameters. As one embodiment, the human-machine interface can be located indoors, while the control controller 10 can be located outdoors.

[0072] In some embodiments, the fresh air handling unit 8 further includes a compressor, a condenser, an expansion valve, and an evaporator. When the fresh air handling unit 8 operates in condensation dehumidification mode, the refrigerant passes through the compressor, condenser, expansion valve, and evaporator sequentially. The specific processing is as follows: the high-temperature, low-pressure refrigerant gas obtained in the previous cycle is compressed by the compressor in the fresh air handling unit 8 to obtain high-temperature, high-pressure refrigerant gas; the high-temperature, high-pressure refrigerant gas is cooled by the condenser to obtain medium-temperature, high-pressure refrigerant gas; the expansion valve throttles and reduces the pressure of the medium-temperature, high-pressure refrigerant gas to obtain low-temperature, low-pressure refrigerant gas; the low-temperature, low-pressure refrigerant gas flows into the evaporator to evaporate, and through evaporation heat absorption, it condenses and dehumidifies the air delivered to the room. The high-temperature, low-pressure refrigerant gas generated after heat exchange in the evaporator re-enters the next cycle, that is, re-enters the compressor, to achieve air circulation condensation dehumidification.

[0073] In some embodiments, the fresh air handling unit 8 provided in this application can also operate in auxiliary heating mode. Under winter operating conditions, if the indoor air temperature is lower than the set winter indoor temperature limit, the fresh air handling unit 8 can be turned on for auxiliary heating while the indoor radiant air conditioner is turned on. The working process of the fresh air handling unit 8 in auxiliary heating mode is as follows:

[0074] The low-temperature, low-pressure refrigerant gas obtained in the previous cycle is compressed by the compressor to produce low-temperature, high-pressure refrigerant gas. The low-temperature, high-pressure refrigerant gas enters the evaporator to evaporate and absorb heat, converting into high-temperature, high-pressure refrigerant gas. The high-temperature, high-pressure refrigerant gas exchanges heat with the air delivered to the room through the condenser, raising the temperature of the air delivered to the room. At the same time, the high-temperature, high-pressure refrigerant gas is converted into medium-temperature, high-pressure refrigerant gas. The medium-temperature, high-pressure refrigerant gas is throttled and depressurized through the expansion valve, converting into low-temperature, low-pressure refrigerant gas to enter the next cycle.

[0075] The fresh air system provided in this embodiment can be used in conjunction with an indoor radiant air conditioner to improve energy efficiency and reduce energy consumption.

[0076] Example 2

[0077] This embodiment provides a method for regulating a fresh air system. This method can be implemented using the fresh air system provided in Embodiment 1. It mainly includes summer operation mode, winter operation mode, and transition operation mode. The division of each operation mode is based on air temperature. Specifically: when the indoor air temperature is higher than the set upper limit t for summer indoor temperature... w1 When the indoor air temperature is lower than the set winter indoor temperature limit t, the summer operating condition is triggered. w2 When this occurs, the winter operating condition is triggered, t w2 <t w1 The triggering condition for the so-called transitional operating condition is: the indoor air temperature is between tw1 and t w2 between.

[0078] It should be noted that the above three operating conditions can be implemented separately or in combination. For example, the control methods for summer operating conditions and winter operating conditions provided in this embodiment can be implemented in summer and winter respectively, and other possible control methods can be used in transitional operating conditions. Alternatively, the control methods for summer operating conditions and transitional operating conditions can be used in combination, and other possible control methods can be used for winter operating conditions.

[0079] The control methods for each operating condition are explained in further detail below:

[0080] (1) Under summer operating conditions, the control method includes the following steps:

[0081] The indoor air temperature is collected, and in response to the indoor air temperature exceeding the set upper limit for summer indoor temperature, summer operation mode is triggered. Under summer operation mode, the main adjustments are made to the indoor air humidity and carbon dioxide concentration. Further control methods include the following steps:

[0082] Collect indoor air humidity ;

[0083] In response to the indoor air humidity exceeding the set indoor air humidity limit. ,Right now > Control the fresh air unit 8 to operate in dehumidification mode;

[0084] In response to the indoor air humidity falling below the set indoor air humidity lower limit ,Right now < And indoor carbon dioxide concentration Exceeding the set upper limit for indoor carbon dioxide concentration Control the fresh air unit 8 to operate in ventilation mode;

[0085] In response to the indoor air humidity being at the set indoor air humidity upper limit. and the lower limit of indoor air humidity The indoor carbon dioxide concentration should be within the specified range and not exceed the set upper limit for indoor carbon dioxide concentration. Control the fresh air unit 8 to enter sleep mode.

[0086] For controlling the fresh air unit 8 to operate in dehumidification mode as described in this embodiment, there are at least two control methods: First, if the outdoor fresh air humidity is lower than the indoor air humidity, the outdoor fresh air can be mixed with the indoor return air, and the indoor air dehumidification can be achieved by adjusting the mixing ratio between the two. In this dehumidification mode, it helps to reduce system energy consumption. Second, if the outdoor fresh air humidity is not lower than the indoor air humidity, the fresh air unit 8 can be used for condensation dehumidification. This dehumidification mode can improve dehumidification efficiency.

[0087] The control methods for these two dehumidification modes are described in further detail below:

[0088] For the first dehumidification mode, the humidity of the outdoor fresh air is first detected. If the outdoor fresh air humidity is lower than the indoor air humidity, the main fan 1 in the fresh air handling unit 8 is turned on. Based on the humidity of the outdoor fresh air and the indoor return air, the opening of the upper air valve 5 in the return air duct 3 is adjusted. By changing the mixing ratio of outdoor fresh air and indoor return air, the indoor air humidity is regulated. Considering that there may be a large temperature difference between outdoor fresh air and indoor air in winter and summer, the introduction of outdoor fresh air may cause fluctuations in indoor air temperature. Therefore, this dehumidification mode is more suitable for dehumidification under transitional operating conditions. In this mode, only the main fan 1 needs to be turned on and the opening of the air valve 5 adjusted to achieve the purpose of dehumidification, which obviously helps to reduce the energy consumption of the fresh air system.

[0089] The second dehumidification mode mainly includes the following steps:

[0090] The high-temperature, low-pressure refrigerant gas generated in the previous cycle is compressed by the compressor in the fresh air handling unit 8 to obtain high-temperature, high-pressure refrigerant gas.

[0091] The high-temperature and high-pressure refrigerant gas is cooled by the condenser in the fresh air unit 8 to obtain medium-temperature and high-pressure refrigerant gas.

[0092] The expansion valve in the fresh air unit 8 is used to throttle and reduce the pressure of the medium-temperature and high-pressure refrigerant gas to obtain low-temperature and low-pressure refrigerant gas.

[0093] The evaporator in the fresh air unit 8 uses low-temperature, low-pressure refrigerant gas to condense and dehumidify the air delivered to the room. The high-temperature, low-pressure refrigerant gas generated after heat exchange re-enters the compressor, thus achieving cyclic dehumidification.

[0094] In the second dehumidification mode, the air temperature after condensation dehumidification will be lower than the outdoor fresh air temperature or the indoor return air temperature, thus having a certain cooling effect. Therefore, the second dehumidification mode is more suitable for summer operation conditions. While dehumidifying, it can also assist in cooling. The second dehumidification mode can achieve the purpose of indoor air dehumidification more efficiently.

[0095] During winter operation, the main consideration is the regulation of indoor air temperature. The fresh air handling unit 8 can assist in indoor radiant air conditioning heating during winter operation. The following is a more detailed explanation of the control methods under winter operation:

[0096] The indoor air temperature is collected in response to the indoor air temperature being lower than the set winter indoor temperature limit and higher than the set fresh air unit 8 operating temperature limit t. w3 At that time, the winter operating conditions are triggered, including:

[0097] Collect outdoor air temperature;

[0098] In response to the outdoor air temperature being higher than the set winter indoor temperature limit, the fresh air unit 8 is controlled to operate in ventilation mode;

[0099] In response to the outdoor air temperature not being higher than the set winter indoor temperature limit, the fresh air unit 8 is controlled to operate in auxiliary heating mode to assist the indoor radiant air conditioning for heating.

[0100] The auxiliary heating mode of the fresh air handling unit 8 can reduce the energy consumption of indoor radiant air conditioning. The control method of the auxiliary heating mode of the fresh air handling unit 8 is explained in further detail below:

[0101] The low-temperature, low-pressure refrigerant gas obtained in the previous cycle is compressed by a compressor to produce low-temperature, high-pressure refrigerant gas. The low-temperature, high-pressure refrigerant gas enters the evaporator to evaporate and absorb heat, converting into high-temperature, high-pressure refrigerant gas. The high-temperature, high-pressure refrigerant gas exchanges heat with the air delivered to the room through the condenser, raising the temperature of the air delivered to the room. At the same time, the high-temperature, high-pressure refrigerant gas is converted into medium-temperature, high-pressure refrigerant gas. The medium-temperature, high-pressure refrigerant gas is throttled and depressurized through an expansion valve, converting into low-temperature, low-pressure refrigerant gas to enter the next cycle.

[0102] For operating conditions during transitional seasons, this embodiment mainly considers indoor air humidity regulation, and the regulation method includes the following steps:

[0103] The system collects indoor air temperature data and, in response to the indoor air temperature falling between a set upper limit for summer indoor temperature and a lower limit for winter indoor temperature, triggers transitional season operating conditions, including:

[0104] Collect indoor air humidity;

[0105] In response to the indoor air humidity being higher than the set upper limit of indoor air humidity, the fresh air unit 8 is controlled to operate in dehumidification mode; the specific control method of this dehumidification mode can be referred to the first dehumidification mode mentioned above, and will not be repeated here;

[0106] In response to the indoor air humidity not exceeding the set indoor air humidity limit, the fresh air unit 8 is controlled to operate in ventilation mode;

[0107] In response to the indoor air humidity being between the set upper limit and lower limit of indoor air humidity, the fresh air unit 8 is controlled to enter a sleep state.

[0108] The aforementioned control of the fresh air handling unit 8 in ventilation mode means that it only filters the air entering the room and does not perform any other treatment; correspondingly, all related processing equipment in the fresh air handling unit 8 is shut down. Dormant mode means that the entire fresh air handling unit 8 is shut down, causing the entire fresh air system to enter a dormant and shut-down state.

[0109] Carbon dioxide concentration is also an important indicator for measuring indoor air quality. Therefore, the control methods provided in this application also include:

[0110] Collect indoor carbon dioxide concentration;

[0111] In response to an indoor carbon dioxide concentration exceeding the set upper limit for indoor carbon dioxide concentration, the system reduces indoor return air and increases the operating power of the main fan 1 and the indoor exhaust fan 15.

[0112] In response to the indoor carbon dioxide concentration being lower than the set indoor carbon dioxide concentration lower limit, the indoor return air is increased and the operating power of the main fan 1 and the indoor exhaust fan 15 is reduced.

[0113] In response to the indoor carbon dioxide concentration being between the set upper and lower limits of indoor carbon dioxide concentration, the indoor return air is increased and the operating power of the main fan 1 and the indoor exhaust fan 15 is reduced.

[0114] In summary, the fresh air system provided in this application can operate independently, and under certain operating conditions, it can also be used in conjunction with radiant air conditioning to regulate the temperature, humidity, and carbon dioxide concentration of indoor air, thereby improving indoor air quality and reducing energy consumption.

[0115] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will be able to understand the specific meaning of the above terms in this application based on the specific circumstances.

[0116] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A fresh air system, characterized in that, This includes control devices and outdoor fresh air handling units; The fresh air handling unit includes a mixing chamber and a main fan for supplying outdoor fresh air to the mixing chamber; The mixing chamber is connected to the indoor environment through a return air duct and a fresh air duct. The return air duct is used to collect indoor return air, so that the indoor return air and the outdoor fresh air are mixed in the mixing chamber. The control device includes a control unit, an indoor sensor group, and an outdoor sensor group; the control unit controls the fresh air handling unit to operate in a predetermined operating mode based on the air quality parameters collected by the indoor and outdoor sensor groups. The air quality parameters include air temperature, humidity, and carbon dioxide concentration; The return air duct is equipped with an adjustable air valve, and the regulating controller adjusts the opening of the air valve and / or the operating power of the main fan according to the collected air quality parameters. The outdoor sensor group includes an outdoor fresh air temperature and humidity sensor located at the air outlet of the main fan, a return air temperature and humidity sensor located at the air outlet of the return air duct, and / or a mixed air temperature and humidity sensor located at the air outlet of the mixing chamber. The indoor sensor group also includes an indoor temperature and humidity sensor, an indoor carbon dioxide sensor, and a radiant panel temperature sensor attached to the ceiling of the indoor radiant air conditioner; The regulating controller adjusts the operating power of the main fan according to the signal collected by the temperature sensor of the radiant panel, so that the surface temperature of the radiant panel is not lower than the dew point; The regulating controller is connected to the indoor exhaust fan and adjusts the opening of the air valve, the operating power of the main fan and / or the operating power of the indoor exhaust fan according to the signal collected by the indoor carbon dioxide sensor.

2. The fresh air system according to claim 1, characterized in that, The fresh air unit also includes a filter for filtering the mixed air output from the mixing chamber.

3. The fresh air system according to claim 1, characterized in that, The control device also includes a human-machine interface panel, through which users can set the operating mode of the fresh air system and the trigger conditions for various operating modes. The trigger conditions include threshold values ​​for air quality parameters.

4. The fresh air system according to any one of claims 1 to 3, characterized in that, The fresh air handling unit also includes a compressor, a condenser, an expansion valve, and an evaporator. When the fresh air handling unit is operating in dehumidification mode to condense and dehumidify the air supplied to the room, the compressor, condenser, expansion valve, and evaporator are connected in sequence. When the fresh air handling unit is operating in auxiliary heating mode to auxiliary heat the air supplied to the room, the compressor, evaporator, condenser, and expansion valve are connected in sequence.

5. A method for regulating a fresh air system as described in any one of claims 1 to 4, characterized in that, The control method includes the following steps: The system collects indoor air temperature data and, in response to an indoor air temperature exceeding a set summer indoor temperature limit, triggers summer operating conditions, including: Collect indoor air humidity; In response to the indoor air humidity being higher than the set upper limit of indoor air humidity, the fresh air unit is controlled to operate in dehumidification mode; In response to the indoor air humidity being lower than the set lower limit of indoor air humidity and the indoor carbon dioxide concentration being higher than the set upper limit of indoor carbon dioxide concentration, the fresh air unit is controlled to operate in ventilation mode; In response to the indoor air humidity being between the set upper limit and lower limit of indoor air humidity, and the indoor carbon dioxide concentration not exceeding the set upper limit of indoor carbon dioxide concentration, the fresh air unit is controlled to enter a dormant state. And / or, The control method includes the following steps: The system collects indoor air temperature data and triggers winter operation mode when the indoor air temperature is lower than the set winter indoor temperature limit but higher than the set fresh air unit operating temperature limit, including: Collect outdoor air temperature; In response to the outdoor air temperature being higher than the set winter indoor temperature limit, the fresh air unit is controlled to operate in ventilation mode; In response to the outdoor air temperature not being higher than the set winter indoor temperature limit, the fresh air handling unit is controlled to operate in auxiliary heating mode to assist the indoor radiant air conditioning for heating. And / or, The control method includes the following steps: The system collects indoor air temperature data and, in response to the indoor air temperature falling between a set upper limit for summer indoor temperature and a lower limit for winter indoor temperature, triggers transitional season operating conditions, including: Collect indoor air humidity; In response to the indoor air humidity being higher than the set upper limit of indoor air humidity, the fresh air unit is controlled to operate in dehumidification mode; In response to the indoor air humidity not exceeding the set indoor air humidity limit, the fresh air unit is controlled to operate in ventilation mode; In response to the indoor air humidity being between the set upper and lower limits of indoor air humidity, the fresh air unit is controlled to enter a sleep state.

6. The method according to claim 5, characterized in that, During transitional seasons, the control of the fresh air handling unit to operate in dehumidification mode includes: Turn on the main fan in the fresh air handling unit; Adjust the opening of the return air duct valve according to the humidity of the outdoor fresh air and the indoor return air, thereby changing the mixing ratio of outdoor fresh air and indoor return air to regulate the indoor air humidity.

7. The method according to claim 5, characterized in that, Under summer operating conditions, the control of the fresh air handling unit to operate in dehumidification mode includes: The high-temperature, low-pressure refrigerant gas is compressed by the compressor in the fresh air handling unit to obtain high-temperature, high-pressure refrigerant gas; The high-temperature and high-pressure refrigerant gas is cooled by the condenser in the fresh air unit to obtain medium-temperature and high-pressure refrigerant gas. The expansion valve in the fresh air handling unit throttles and reduces the pressure of the medium-temperature, high-pressure refrigerant gas to obtain a low-temperature, low-pressure refrigerant gas. The evaporator in the fresh air handling unit uses low-temperature, low-pressure refrigerant gas to condense and dehumidify the air delivered to the room. The high-temperature, low-pressure refrigerant gas generated after heat exchange re-enters the compressor, thus achieving cyclic dehumidification.

8. The method according to claim 5, characterized in that, The method further includes: Collect indoor carbon dioxide concentration; In response to indoor carbon dioxide concentration exceeding the set upper limit, the system reduces indoor return air and increases the operating power of the main fan and indoor exhaust fan. In response to the indoor carbon dioxide concentration being lower than the set indoor carbon dioxide concentration lower limit, the indoor return air is increased and the operating power of the main fan and indoor exhaust fan is reduced. In response to the indoor carbon dioxide concentration being between the set upper and lower limits of indoor carbon dioxide concentration, the system increases indoor return air and reduces the operating power of the main fan and indoor exhaust fan.

Images