CN110793145A

CN110793145A - Ground exhaust system and control method thereof

Info

Publication number: CN110793145A
Application number: CN201911306657.XA
Authority: CN
Inventors: 张银梁
Original assignee: Haidilao Holdings Ltd
Current assignee: Haidilao Holdings Ltd
Priority date: 2019-12-18
Filing date: 2019-12-18
Publication date: 2020-02-14
Anticipated expiration: 2039-12-18
Also published as: CN110793145B

Abstract

The application relates to a ground exhaust system and a control method thereof, wherein the ground exhaust system comprises: the ground air exhaust subsystem is arranged at each dining table in the room and used for exhausting air in the room; the fresh air subsystem is arranged in the room and used for supplementing fresh air to the room; and the controller is respectively connected with the ground exhaust subsystem and the fresh air subsystem. The technical scheme provided by the application avoids energy waste caused by that the customer satisfaction is reduced due to untimely opening of the exhaust fan and the exhaust is opened all the time due to forgetting to close the exhaust fan; meanwhile, energy waste caused by improper adjustment of the fresh air handling unit is avoided, and store operating cost is reduced.

Description

Ground exhaust system and control method thereof

Technical Field

The application belongs to the technical field of energy conservation, and particularly relates to a ground exhaust system and a control method thereof.

Background

In order to eliminate the problem of peculiar smell in the dining environment and improve the dining experience of customers, a corresponding exhaust system and a corresponding fresh air system are configured in a common hot pot restaurant.

In the related art, a ground exhaust system generally needs to be operated all day long, and a store is provided with a specially-assigned person to manually switch an exhaust fan every day, so that the customer satisfaction is reduced due to untimely opening, and the exhaust fan is always opened due to forgetting to close sometimes, so that energy waste is caused. The fresh air system generally needs the store operator to open the adjustment according to the condition of opening of airing exhaust that direct observation, opens the fresh air handling unit according to personal experience, and this kind of condition exists the problem of adjusting fresh air handling unit mistuning easily, has leaded to the unnecessary energy extravagant.

Disclosure of Invention

In order to overcome the problem of energy waste in the related art at least to a certain extent, the application provides a ground exhaust system and a control method thereof.

In a first aspect, the present application provides a ground exhaust system comprising:

the ground air exhaust subsystem is arranged at each dining table in the room and used for exhausting air in the room;

the fresh air subsystem is arranged in the room and used for supplementing fresh air to the room;

and the controller is respectively connected with the ground exhaust subsystem and the fresh air subsystem.

Preferably, the ground air exhaust subsystem comprises: the air-conditioning system comprises an exhaust fan, an exhaust main pipe, a plurality of exhaust vertical pipes, a current transformer and a tail end air valve;

the main exhaust pipe is connected with an air inlet of the exhaust fan;

one end of each air exhaust vertical pipe is connected with an air outlet of the dining table, and the other end of each air exhaust vertical pipe is communicated with an air exhaust main pipe;

a tail end air valve is arranged in each air exhaust vertical pipe and used for controlling the starting and stopping of the air exhaust of the dining table;

the current transformer is arranged at the induction cooker of each dining table and used for monitoring the starting and stopping states of the induction cookers;

and the controller is used for controlling the starting or closing of the tail end air valve according to the starting and stopping states of the induction cooker monitored by the current transformer.

Preferably, the ground air exhaust subsystem further comprises:

the wind pressure sensor is arranged at the communication position of the exhaust vertical pipe at the farthest end of the exhaust main pipe and is used for monitoring wind pressure information in the exhaust main pipe;

the first frequency converter is arranged in a power supply box of the exhaust fan and is used for adjusting the working frequency of a motor of the exhaust fan;

the main air valve is arranged in the main air exhaust pipe and close to the air inlet of the exhaust fan and is used for controlling the starting and stopping of the main air exhaust pipe;

the controller is used for controlling the starting or closing of the main air valve according to the starting and stopping states of the induction cooker monitored by the current transformer and the air pressure information in the exhaust main pipe monitored by the air pressure sensor, and controlling the first frequency converter to adjust the working frequency of the motor of the exhaust fan.

Preferably, the ground air exhaust subsystem further comprises: the bypass air pipe is communicated with the exhaust main pipe and used for providing outdoor air supplement for adjusting the air pressure of the ground exhaust system when the opening quantity of the induction cookers is lower than a preset quantity;

a bypass air valve is arranged in the bypass air pipe and used for controlling the air supplement amount of the bypass air pipe;

and the controller is used for controlling the opening of the bypass air valve according to the on-off state of the induction cooker monitored by the current transformer.

Preferably, the fresh air subsystem includes: the system comprises a first pressure difference sensor, a humidity sensor and at least two fresh air units;

the two pressure contacts of the first differential pressure sensor are respectively arranged indoors and outdoors and used for monitoring indoor and outdoor differential pressure;

the humidity sensor is arranged indoors and used for monitoring indoor humidity;

the at least two fresh air units are used for supplementing fresh air to the room and/or returning air and dehumidifying the room;

the controller is used for controlling the at least two fresh air units to supply fresh air indoors according to the indoor and outdoor pressure difference monitored by the first pressure difference sensor, and controlling the at least two fresh air units to return air and dehumidify indoors according to the indoor humidity monitored by the humidity sensor.

Preferably, each of the fresh air units includes: the fresh air pipeline is connected with an air inlet of the fresh air unit; a fresh air valve and a first temperature sensor are sequentially arranged in the fresh air pipeline from the outdoor direction to the indoor direction;

the fresh air valve is used for controlling the start and stop of a fresh air pipeline;

the first temperature sensor is used for monitoring the air supply temperature of the fresh air handling unit;

and the controller is used for controlling the chilled water three-way valve of the fresh air handling unit according to the air supply temperature of the fresh air handling unit monitored by the first temperature sensor.

Preferably, each fresh air unit further comprises:

the second frequency converter is arranged in a power supply electric box of the fresh air handling unit and is used for adjusting the working frequency of a motor of the fresh air handling unit;

the electric tracing heat is arranged on a chilled water supply pipe and a chilled water return pipe of the fresh air handling unit and is used for heating the chilled water supply pipe and the chilled water return pipe of the fresh air handling unit;

the second temperature sensor is arranged on the surface of the chilled water return pipe and used for monitoring the return water temperature of the chilled water;

the controller is used for controlling the second frequency converter to adjust the working frequency of the motor of the fresh air handling unit according to the indoor and outdoor pressure difference monitored by the first pressure difference sensor, and controlling the working state of electric tracing according to the return water temperature of the chilled water monitored by the second temperature sensor.

Preferably, each fresh air unit further comprises a second pressure difference sensor for monitoring the pressure difference between two sides of the filter screen of the fresh air unit;

and two pressure contacts of the second differential pressure sensor are respectively arranged in the fresh air pipelines at two sides of the filter screen of the fresh air handling unit.

Preferably, there is a certain new trend unit in at least two new trend units, still includes: the air return pipeline is communicated with the fresh air pipeline between the fresh air valve and the air inlet of the fresh air unit, and the return air valve is arranged in the air return pipeline;

the return air valve is used for controlling the start and stop of a return air pipeline;

the controller is also used for controlling the start and stop of the return air valve and the start and stop of the fresh air handling unit according to the indoor humidity monitored by the humidity sensor.

In a second aspect, the present application provides a method of controlling a floor air exhaust system, comprising:

determining indoor dining conditions, and controlling the air discharge amount of the ground air discharge subsystem according to the dining conditions;

acquiring indoor and outdoor pressure difference, and controlling the fresh air supplement amount of the fresh air subsystem according to the indoor and outdoor pressure difference so as to reduce or eliminate the indoor and outdoor pressure difference caused by air exhaust of the ground air exhaust subsystem;

and acquiring indoor humidity, and controlling the fresh air subsystem to return air and dehumidify according to the indoor humidity.

The technical scheme provided by the embodiment of the application can have the following beneficial effects:

according to the technical scheme, the air is exhausted indoors through the ground air exhaust subsystems arranged at the dining tables in the rooms, the fresh air subsystems arranged in the rooms supplement fresh air indoors, and the controller is connected with the ground air exhaust subsystems and the fresh air subsystems respectively, so that the energy waste caused by the fact that the air exhaust is always started due to the fact that the satisfaction degree of customers is lowered and the air exhaust machine is forgotten to be closed when the air exhaust machine is not started in time is avoided; meanwhile, the defect of opening and adjusting the fresh air handling unit according to personal experience is avoided, more effective adjustment of fresh air can be realized, energy waste caused by improper adjustment of the fresh air handling unit is avoided, and store operating cost is reduced.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

FIG. 1 is a schematic structural view of a ground exhaust system provided in accordance with an embodiment of the present application;

FIG. 2 is a schematic structural view of a ground exhaust subsystem provided in accordance with an embodiment of the present application;

FIG. 3 is a schematic diagram of a fresh air unit according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a fresh air unit with a dehumidification function according to an embodiment of the present application;

FIG. 5 is a schematic flow chart diagram of a method of controlling a geo-exhaust system according to one embodiment of the present application;

FIG. 6 is a schematic flow diagram of a ground exhaust subsystem provided in accordance with an embodiment of the present application;

in FIG. 1, 100-ground exhaust subsystem, 101-exhaust fan, 102-main exhaust pipe, 103-vertical exhaust pipe, 104-current transformer, 105-end air valve, 200-fresh air subsystem;

in FIG. 2, 101-exhaust fan, 102-main exhaust pipe, 103-vertical exhaust pipe, 104-current transformer, 105-end air valve, 106-wind pressure sensor, 107-bypass air valve, 108-bypass air pipe, 109-main air valve;

in fig. 3, 201 is a fresh air unit, 202 is a filter screen, 203 is a fresh air valve, 204 is a fresh air pipeline, 205 is a first temperature sensor, and 206 is a return air valve.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

Fig. 1 is an embodiment of the present application, which provides a ground air exhaust system, and referring to fig. 1, the ground air exhaust system includes:

a ground exhaust subsystem 100 provided at each dining table in the room for exhausting air indoors;

the fresh air subsystem 200 is arranged indoors and used for supplementing fresh air indoors;

and the controller is respectively connected with the ground exhaust subsystem 100 and the fresh air subsystem 200.

It should be noted that the type of controller may be, but is not limited to, a DDC controller.

The floor exhaust system provided by the embodiment avoids energy waste caused by the fact that the exhaust fan 101 is always started due to the fact that the customer satisfaction is reduced and the exhaust fan 101 is forgotten to be turned off because the exhaust fan 101 is not started in time; meanwhile, the defect of opening and adjusting the fresh air handling unit 201 according to personal experience is avoided, more effective adjustment of fresh air can be achieved, energy waste caused by improper adjustment of the fresh air handling unit 201 is avoided, and store operation cost is reduced.

Further optionally, referring to fig. 2, the ground exhaust subsystem 100 includes: the system comprises an exhaust fan 101, an exhaust main pipe 102, a plurality of exhaust vertical pipes 103, a current transformer 104 and a tail end air valve 105;

the main exhaust pipe 102 is connected with an air inlet of the exhaust fan 101;

one end of each air exhaust vertical pipe 103 is connected with an air outlet of the dining table, and the other end is communicated with an air exhaust main pipe 102;

a tail end air valve 105 is arranged in each air exhaust vertical pipe 103 and used for controlling the starting and stopping of the air exhaust of the dining table;

the current transformer 104 is arranged at the induction cooker of each dining table and used for monitoring the starting and stopping states of the induction cooker;

and the controller is used for controlling the starting or closing of the end air valve 105 according to the starting or stopping state of the induction cooker monitored by the current transformer 104.

It is easily understood that the controller is connected to the current transformer 104 and the end damper 105, respectively; it should be noted that, in this embodiment, the connection manner of the "controller is connected to the current transformer 104 and the end damper 105" respectively is not further limited, and the connection manner may be selected according to the needs of those skilled in the art.

In some embodiments, the start-stop state of the induction cooker is monitored by using an intermediate relay, an infrared sensor or a pressure switch, and a person skilled in the art can select the equipment for monitoring the start-stop state of the induction cooker according to actual needs.

It should be noted that, a person skilled in the art can install the exhaust fan 101 indoors or outdoors according to actual needs.

Further optionally, the ground exhaust subsystem 100 further includes:

the wind pressure sensor 106 is arranged at the communication position of the exhaust vertical pipe 103 at the farthest end of the exhaust main pipe 102 and is used for monitoring wind pressure information in the exhaust main pipe 102;

the first frequency converter is arranged in a power supply box of the exhaust fan 101 and is used for adjusting the working frequency of a motor of the exhaust fan 101;

the main air valve 109 is arranged in the main air exhaust pipe 102 and close to the air inlet of the exhaust fan 101 and is used for controlling the starting and stopping of the main air exhaust pipe 102;

and the controller is used for controlling the starting or closing of the main air valve 109 and controlling the first frequency converter to adjust the working frequency of the motor of the exhaust fan 101 according to the starting and stopping states of the induction cooker monitored by the current transformer 104 and the air pressure information in the exhaust main pipe 102 monitored by the air pressure sensor 106.

It is easy to understand that the controller is respectively connected with the wind pressure sensor 106, the first frequency converter and the main air valve 109; it should be noted that, in this embodiment, the connection manner of the controller and the wind pressure sensor 106, the first frequency converter, and the main wind valve 109 respectively is not further limited, and the connection manner can be selected according to the needs of those skilled in the art.

It should be noted that since the duct size of the main exhaust duct 102 is not changed, when the motor of the exhaust fan 101 is varied in frequency, the air volume and the air speed are inevitably reduced, and therefore the pressure at the end is naturally reduced, and in order to maintain the pressure at the end, the duct ventilation size of the main exhaust duct 102 (that is, the opening degree of the main air valve 109 is reduced) needs to be reduced.

It should also be noted that the main damper 109 may be, but is not limited to, a proportional-integral electric control damper.

For example, the restaurant a is provided with an underground exhaust subsystem 100, when a guest has a meal, the induction cooker is started, the current transformer 104 at the started induction cooker transmits a signal for starting the induction cooker to the controller, and the controller controls the end air valve 105 corresponding to the started induction cooker to start and open the main air valve 109 and the exhaust fan 101 according to the received signal for starting the induction cooker; the controller controls the first frequency converter to adjust the operating frequency of the motor of the exhaust fan 101 according to whether the number of opened induction cookers meets the preset number of opened induction cookers and/or whether the wind pressure information (herein, the wind pressure information refers to a wind pressure value) in the exhaust main pipe 102 monitored by the wind pressure sensor 106 meets the preset wind pressure value (it should be noted that, a person skilled in the art can set the preset number of opened induction cookers and the preset wind pressure value according to experience or engineering requirements).

Further optionally, the ground exhaust subsystem 100 further includes: the bypass air pipe 108 is communicated with the exhaust main pipe 102 and is used for providing outdoor air supplement for adjusting the air pressure of the ground exhaust system when the opening quantity of the induction cookers is lower than a preset quantity;

a bypass air valve 107 is arranged in the bypass air pipe 108 and used for controlling the air supplement amount of the bypass air pipe 108;

and the controller is used for controlling the opening degree of the bypass air valve 107 according to the on-off state of the induction cooker monitored by the current transformer 104.

It will be readily appreciated that the controller is connected to the bypass damper 107; it should be noted that, in this embodiment, the connection manner of the "controller and the bypass damper 107" is not further limited, and the connection manner may be selected according to the needs of those skilled in the art.

It should be noted that the bypass damper 107 may be, but is not limited to, a proportional-integral electric control damper.

It should be noted that, when the exhaust fan 101 is in operation, the motor of the exhaust fan 101 generally has a minimum operating power (the minimum operating frequency here means not zero), and when the number of the opened induction cookers is lower than the preset number and the operating frequency of the motor of the exhaust fan 101 is the minimum operating frequency in operation, at this time, the air volume extracted from the exhaust vertical pipe 103 does not meet the air draft volume of the minimum operating frequency in operation of the motor of the exhaust fan 101, at this time, the controller is required to open the bypass air valve 107, and introduce the outdoor air into the exhaust main pipe 102, so as to keep the air pressure balance in the exhaust main pipe 102.

It will be readily appreciated that the bypass duct 108 needs to be open to the outside; the controller adjusts the amount of air introduced into the main exhaust duct 102 from the outside by controlling the opening of the bypass damper 107, thereby keeping the air pressure in the main exhaust duct 102 balanced.

For example, assuming that the preset number is 6, the lowest operating frequency of the motor of the exhaust fan 101 during operation is 30Hz, that is, when the number of the opened induction cookers is 6, the air volume provided at the indoor dining table is exactly equal to the air volume drawn by the motor of the exhaust fan 101 at the lowest operating frequency of 30Hz, and the air pressure in the main exhaust pipe 102 is relatively balanced;

assuming that the number of opened electromagentic ovens of the motor of the exhaust fan 101 is 3, the number of opened electromagentic ovens is 3 less than the preset number 6, and the air quantity extracted from the exhaust vertical pipe 103 does not meet the air draft quantity when the working frequency of the motor of the exhaust fan 101 is the lowest working frequency of 30Hz, the controller is required to open the bypass air valve 107 at this time, and outdoor air is introduced into the exhaust main pipe 102 to keep the air pressure in the exhaust main pipe 102 balanced; and the opening of the bypass air valve 107 can be controlled by the controller, so that the waste of power resources caused by the increase of the working frequency of the motor of the exhaust fan 101 due to the excessive air volume introduced into the exhaust main pipe 102 is avoided.

Further optionally, the fresh air subsystem 200 includes: the system comprises a first pressure difference sensor, a humidity sensor and at least two fresh air units;

two pressure contacts of the first differential pressure sensor are respectively arranged indoors and outdoors and used for monitoring indoor and outdoor differential pressure;

the fresh air units are used for supplementing fresh air to the room and/or returning air and dehumidifying the room;

and the controller is used for controlling the at least two fresh air units to supply fresh air indoors according to the indoor and outdoor pressure difference monitored by the first pressure difference sensor, and controlling the at least two fresh air units to return air and dehumidify indoors according to the indoor humidity monitored by the humidity sensor.

It is easily understood that the controller is connected with the first differential pressure sensor and the humidity sensor, respectively; it should be noted that, in this embodiment, the connection manner of the "controller is respectively connected to the first differential pressure sensor and the humidity sensor" is not further limited, and the connection manner may be selected according to the needs of those skilled in the art.

It should be noted that the number of fresh air units can be selected by those skilled in the art according to engineering requirements.

Further optionally, referring to fig. 3, each fresh air unit includes: a fresh air pipeline 204 connected with an air inlet of the fresh air handling unit 201; a fresh air valve 203 and a first temperature sensor 205 are sequentially arranged in the fresh air pipeline 204 from the outdoor to the indoor direction;

the fresh air valve 203 is used for controlling the start and stop of the fresh air pipeline 204;

a first temperature sensor 205, configured to monitor an air supply temperature of the fresh air handling unit 201;

and the controller is used for controlling the chilled water three-way valve of the fresh air unit 201 according to the air supply temperature of the fresh air unit 201 monitored by the first temperature sensor 205.

Further optionally, each fresh air unit further comprises:

the second frequency converter is arranged in a power supply box of the fresh air handling unit 201 and is used for adjusting the working frequency of a motor of the fresh air handling unit 201;

the electric tracing heat is arranged on a chilled water supply pipe and a chilled water return pipe of the fresh air handling unit 201 and is used for heating the chilled water supply pipe and the chilled water return pipe of the fresh air handling unit 201;

and the controller is used for controlling the second frequency converter to adjust the working frequency of the motor of the fresh air handling unit 201 according to the indoor and outdoor pressure difference monitored by the first pressure difference sensor and controlling the working state of the electric tracing according to the return water temperature of the chilled water monitored by the second temperature sensor.

As can be easily understood, the controller is respectively connected with each fresh air damper 203, each first temperature sensor 205, each second frequency converter, each second temperature sensor and each electric tracing; it should be noted that, in this embodiment, the connection manner of the controller with each fresh air damper 203, each first temperature sensor 205, each second frequency converter, each second temperature sensor, and each electric tracing respectively is not further limited, and the connection manner may be selected according to the needs of those skilled in the art.

It should be noted that the chilled water required by stores is generally provided by property, the fresh air unit further comprises a chilled water three-way valve, and a water supply port and a water return port of the chilled water three-way valve are respectively and correspondingly connected with a chilled water supply pipe and a chilled water return pipe of the property. The chilled water supply pipe and the chilled water return pipe are heated by electric heat tracing, so that the chilled water supply pipe and the chilled water return pipe are prevented from being frozen due to low temperature.

Specifically, optionally, when the supply air temperature of the fresh air handling unit 201 monitored by the first temperature sensor 205 is greater than the upper limit of the supply air temperature setting value, the controller decreases the opening of the water supply port of the chilled water three-way valve (decreases the supply amount of chilled water) and increases the opening of the water return port of the chilled water three-way valve (increases the return amount of chilled water); when the supply air temperature of the fresh air handling unit 201 monitored by the first temperature sensor 205 is less than the lower limit of the supply air temperature setting value, the controller increases the opening degree of the water supply port of the chilled water three-way valve (increases the supply amount of chilled water) and decreases the opening degree of the water return port of the chilled water three-way valve (decreases the return amount of chilled water).

It is easy to understand that, when the fresh air handling unit 201 operates for a period of time, the indoor temperature tends to be stable, and excessive cold energy is not needed to cool, and at this time, the amount of chilled water passing through the fresh air handling unit needs to be reduced, that is, the opening of the three-way water valve is reduced to limit the supply amount of the chilled water.

In some embodiments, each fresh air unit further comprises a second pressure difference sensor for monitoring a pressure difference between two sides of the filter screen 201 of the fresh air unit 201;

two pressure contacts of the second differential pressure sensor are respectively arranged in the fresh air pipelines 204 at two sides of the filter screen 202 of the fresh air handling unit 201, so that the service life monitoring function of the filter screen 202 is realized.

It is easy to understand that the filter screen 202 is disposed in the fresh air duct 204 near the air inlet of the fresh air handling unit 201 for filtering dust in the fresh air.

Further optionally, referring to fig. 4, there is a certain new trend unit in at least two new trend units, still includes: a return air duct communicated with the fresh air duct 204 between the fresh air valve and the air inlet of the fresh air handling unit 201, and a return air valve 206 is arranged in the return air duct;

the return air valve 206 is used for controlling the start and stop of a return air pipeline;

and the controller is also used for controlling the start and stop of the return air valve 206 and the start and stop of the fresh air handling unit 201 according to the indoor humidity monitored by the humidity sensor.

It should be noted that, when the return air dehumidification is not needed, the fresh air handling unit 201 of the fresh air unit with the dehumidification function is turned off first, and the return air valve 206 is turned off after a delay (for example, 30 s). If the fresh air handling unit 201 of the fresh air unit with the dehumidification function is not closed, the fresh air valve 203 is also closed because the return air valve 206 is closed, and the fresh air handling unit 201 of the fresh air unit with the dehumidification function is damaged because of the blockage of the air duct.

As will be readily appreciated, the controller is connected to the return air damper 206; it should be noted that the connection manner of the "controller and the return air damper 206" is not further limited in this embodiment, and the connection manner can be selected according to the needs of those skilled in the art.

It is easy to understand that the ground exhaust subsystem 100 discharges the indoor air (especially during the peak of a meal), leads to indoor outer differential pressure to change, and the gate still forms the negative pressure easily and causes cold wind to flow backward, just at this moment needs the new trend subsystem 200 to balance indoor outer differential pressure to indoor new trend of supplying. The humidity of the supplemented fresh air is high, when the high-humidity fresh air is supplemented indoors, the indoor humidity is high, and the fresh air unit with the dehumidification function in the fresh air subsystem 200 is needed to perform return air dehumidification.

It should be noted that the fresh air unit with the dehumidification function cannot start the fresh air function and the return air dehumidification function at the same time, and only can select one of the fresh air function and the return air dehumidification function.

For example, a floor exhaust system is arranged in a restaurant B, when a customer has a meal, the floor exhaust subsystem 100 is opened, but the air in the restaurant is exhausted by the exhaust fan 101 in the floor exhaust subsystem 100, so that the indoor and outdoor pressure difference of the restaurant changes, at the moment, if the controller judges that the indoor and outdoor pressure difference monitored by the first pressure difference sensor does not meet the pressure difference threshold value and fresh air needs to be supplemented, the controller opens the fresh air valves 203 of the fresh air units according to the indoor and outdoor pressure difference, and controls the second frequency converter to adjust the working frequency of the motors of the fresh air units 201 until the indoor and outdoor pressure difference meets the pressure difference threshold value; if the controller judges that the indoor and outdoor pressure difference monitored by the first pressure difference sensor meets the pressure difference threshold value, the fresh air unit is not required to be supplemented with fresh air;

wherein, when the fresh air is mended in the dining room, can bring the moisture in the new trend into the dining room in, if the controller judges that the indoor humidity that humidity transducer monitored does not satisfy the humidity threshold value, then the fresh air valve of the new trend unit that the controller control has the dehumidification function closes, and the return air blast gate 206 of the new trend unit that the controller control has the dehumidification function opens, carries out the return air dehumidification.

In some embodiments, a return air humidity sensor is further disposed at a return air inlet of the return air pipeline, and is used for providing a reference basis for achieving return air dehumidification regulation. For example, the return air humidity sensor at the return air inlet and the indoor humidity sensor are used in combination, and particularly, optionally, when the humidity values monitored by the return air humidity sensor at the return air inlet and the indoor humidity sensor are equal and both meet the humidity threshold value, return air dehumidification is not performed.

According to the ground exhaust system provided by the embodiment, the controller is adopted to start the exhaust fan 101 according to the opening condition of the induction cooker monitored by the current transformer 104, so that the energy waste caused by the fact that the exhaust fan 101 is always opened due to the fact that the customer satisfaction is reduced and the exhaust fan 101 is forgotten to be closed because personnel cannot start the exhaust fan 101 in time in the prior art is avoided; the controller is adopted to control the starting or closing of the main air valve 109 according to the starting and stopping state of the induction cooker monitored by the current transformer 104 and the air pressure information in the exhaust main pipe 102 monitored by the air pressure sensor 106, and control the first frequency converter to adjust the working frequency of the motor of the exhaust fan 101, so that the working frequency of the motor of the exhaust fan 101 is adjusted according to actual needs, the electricity charge is saved, and the operation cost of a store is further reduced; the ground exhaust subsystem 100 provided by the embodiment does not need to operate all day long, and only needs to operate when customers exist, so that the loss caused by the all day operation of the exhaust fan 101 is reduced, the service life of the exhaust fan 101 is prolonged, the energy waste is avoided, the electricity charge is saved, and the operation cost of a store is reduced;

according to the ground exhaust system provided by the embodiment, the controller is adopted to control the at least two fresh air units according to the indoor and outdoor pressure differences monitored by the first pressure difference sensor to supply fresh air indoors, so that the defect that in the prior art, a store operator needs to open and adjust the fresh air unit 201 according to the directly observed exhaust opening condition and personal experience is overcome, more effective adjustment of the fresh air is realized, energy waste caused by improper adjustment of the fresh air unit 201 is avoided, and the store operation cost is reduced; the fresh air unit with the dehumidification function is controlled to carry out return air dehumidification indoors according to the indoor humidity monitored by the humidity sensor through the controller, store condensate water is avoided, and dining experience of customers is improved.

In order to implement the above-mentioned ground air exhaust system cooperatively, an embodiment of the present invention provides a control method of a ground air exhaust system, which can be used in a terminal, but is not limited to be used in fig. 5, and includes the following steps:

101. determining the indoor dining condition, and controlling the air discharge amount of the ground air discharge subsystem 100 according to the dining condition;

102. acquiring indoor and outdoor pressure difference, and controlling the fresh air supplement amount of the fresh air subsystem 200 according to the indoor and outdoor pressure difference so as to reduce or eliminate the indoor and outdoor pressure difference caused by air exhaust of the ground exhaust subsystem 100;

103. and acquiring indoor humidity, and controlling the fresh air subsystem 200 to return air and dehumidify according to the indoor humidity.

According to the control method of the ground exhaust system provided by the embodiment of the invention, the indoor dining condition is determined, and the exhaust volume of the ground exhaust subsystem 100 is controlled according to the dining condition, so that the energy waste caused by the fact that the exhaust fan 101 is always opened due to the fact that the customer satisfaction is reduced and the exhaust fan 101 is forgotten to be closed when the exhaust fan 101 is not started in time is avoided; by acquiring the indoor and outdoor pressure difference and controlling the fresh air supplement amount of the fresh air subsystem 200 according to the indoor and outdoor pressure difference, the indoor and outdoor pressure difference caused by air exhaust of the ground air exhaust subsystem 100 is reduced or eliminated, the defect that the fresh air handling unit 201 is opened and adjusted according to personal experience is overcome, the fresh air can be effectively adjusted, energy waste caused by improper adjustment of the fresh air handling unit 201 is avoided, and the store operation cost is reduced; through obtaining indoor humidity, carry out the return air dehumidification according to indoor humidity control new trend subsystem 200, avoid the store comdenstion water to appear, improved customer and experienced with dinner.

Further optionally, referring to fig. 6, step 101 includes:

step 1011: when the current transformer 104 monitors that no induction cooker is started, the controller delays a first time period and then controls the first frequency converter to adjust the working frequency of a motor of the exhaust fan 101 to be 0Hz, and the controller delays a second time period and then controls the opening of the main air valve 109 to be zero;

it is easy to understand that the chafing dish still needs to discharge smoke for a short time when the induction cooker is turned off; and because the electromagnetic oven has a low gear, the working state is that the electromagnetic oven is intermittently heated, so that the working state is intermittent and current, and because the air valve needs time to be closed, the working state can cause the air valve to be completely closed finally.

It should be noted that the "first time period" and the "second time period" may be set by those skilled in the art according to historical experience values or experimental data.

For example, a floor exhaust system is installed in a restaurant, if the number of people having meals in the restaurant is zero, the number of opened induction cookers monitored by the current transformer 104 is zero, 300 seconds of delay is performed after the controller receives that the number of opened induction cookers monitored by the current transformer 104 is zero, then the first frequency converter is adjusted to control the working frequency of the motor of the exhaust fan 101 to be 0Hz, and the controller controls the opening of the main air valve 109 to be zero after 30 seconds of delay;

it is easy to understand that the opening degree of the main air valve 109 is zero, that is, the main air valve 109 is closed.

Step 1012: when the current transformer 104 monitors that the opening number of the induction cookers is greater than zero and less than a first preset value (it needs to be explained that the first preset value is a preset number of the opening number of the induction cookers corresponding to the lowest working frequency of the motor of the exhaust fan 101 during working), the controller controls the tail end air valve 105 corresponding to the opened induction cookers to open, the controller controls the first frequency converter to adjust the working frequency of the motor of the exhaust fan 101 to be a second preset value (it needs to be explained that the second preset value is the lowest working frequency of the motor of the exhaust fan 101 during working, where the lowest working frequency is not zero), the controller controls the main air valve 109 and the bypass air valve 107 in the bypass air pipe 108 to open, and the controller adjusts the opening degrees of the main air valve 109 and the bypass air valve 107 according to the air pressure information in the exhaust main pipe 102 monitored by the air pressure sensor 106;

it should be noted that, in the embodiments of the present invention, a manner of "the controller" adjusts the opening degree of the bypass air valve 107 "according to the air pressure information in the exhaust main pipe 102 monitored by the air pressure sensor 106 is not limited, and may be selected by a person skilled in the art according to engineering requirements, and in some embodiments, a manner of" the controller "adjusts the opening degree of the bypass air valve 107" according to the air pressure information in the exhaust main pipe 102 monitored by the air pressure sensor 106 may be, but is not limited to: the relationship between "wind pressure information in the exhaust main pipe 102" and "the opening degree of the bypass damper 107" is obtained by an algorithm based on experimental data or historical data.

For example, assume that the first preset values are 6, and the second preset value is 30 HZ; assuming that the number of the opened induction cookers monitored by the current transformer 104 is 4, and 4 is less than 6, the controller controls the tail end air valve 105 corresponding to the opened induction cookers to be opened, the controller controls the first frequency converter to adjust the working frequency of the motor of the exhaust fan 101 to be 30HZ, and the controller controls the main air valve 109 to be opened; because the air volume provided by opening 4 induction cookers does not meet the air pumping volume when the operating frequency of the motor of the exhaust fan 101 is 30HZ, the controller is also required to control the bypass air valve 107 in the bypass air pipe 108 to open, and the controller adjusts the openings of the main air valve 109 and the bypass air valve 107 according to the air pressure information in the exhaust main pipe 102 monitored by the air pressure sensor 106.

Step 1013: when the current transformer 104 monitors that the opening number of the induction cookers is a first preset value (it needs to be explained that the first preset value is a preset number of the opening number of the induction cookers corresponding to the lowest working frequency of the motor of the exhaust fan 101 during working), the controller controls the tail end air valve 105 corresponding to the opened induction cookers to be opened, the controller controls the main air valve 109 to be opened, the controller controls the first frequency converter to adjust the working frequency of the motor of the exhaust fan 101 to be a second preset value (it needs to be explained that the second preset value is the lowest working frequency of the motor of the exhaust fan 101 during working, and the lowest working frequency is not zero), and the controller adjusts the opening degree of the main air valve 109 according to the air pressure information in the exhaust main pipe 102 monitored by the air pressure sensor 106;

for example, assume that the first preset values are 6, and the second preset value is 30 HZ; assuming that the number of the induction cookers which are started is monitored by the current transformer 104 to be 6, the controller controls the tail end air valve 105 corresponding to the started induction cookers to be opened, the controller controls the main air valve 109 to be opened, and the controller controls the first frequency converter to adjust the working frequency of the motor of the exhaust fan 101 to be 30 HZ;

step 1014: when the current transformer 104 monitors that the number of the opened induction cookers is greater than a first preset value (it should be noted that the first preset value is a preset number of the opened induction cookers corresponding to the lowest working frequency when the motor of the exhaust fan 101 works), the controller controls the end air valve 105 corresponding to the opened induction cookers to be opened, the controller controls the main air valve 109 to be opened, the controller controls the first frequency converter to adjust the working frequency of the motor of the exhaust fan 101 to be between a second preset value and a third preset value, and the controller adjusts the opening degree of the main air valve 109 according to the air pressure information in the exhaust main pipe 102 monitored by the air pressure sensor 106.

It should be noted that, in the embodiments of the present invention, how to control the first frequency converter to adjust the operating frequency of the motor of the exhaust fan 101 to be between the first preset value and the second preset value is not limited, and may be selected by a person skilled in the art according to engineering requirements.

It should be noted that, since the duct size of the main exhaust duct 102 is not changed, when the motor of the exhaust fan 101 is varied in frequency, the air volume and the air speed are inevitably reduced, and therefore, the pressure at the end is naturally reduced, and in order to maintain the pressure at the end unchanged, the duct ventilation size of the main exhaust duct 102 needs to be reduced (that is, the opening of the main air valve 109 is reduced);

in some embodiments, the manner of "the controller adjusts the opening of the main air valve 109 according to the wind pressure information in the main exhaust air pipe 102 monitored by the wind pressure sensor 106" may be selected by a person skilled in the art according to engineering requirements, and the manner of "the controller adjusts the opening of the main air valve 109" according to the wind pressure information in the main exhaust air pipe 102 monitored by the wind pressure sensor 106 "may be, but is not limited to: the relationship between "wind pressure information in the main exhaust duct 102" and "the opening degree of the main damper 109" is obtained by an algorithm based on experimental data or historical data.

It should be noted that, a person skilled in the art may set the "first preset value", the "second preset value" and the "third preset value" according to historical empirical values or experimental data.

For example, a restaurant is provided with a ground exhaust system, and the first preset value is assumed to be 6, the second preset value is assumed to be 30Hz, and the third preset value is assumed to be 50 Hz; if the current transformer 104 monitors that the number of the opened induction cookers is 8, the controller controls the tail end air valve 105 corresponding to the opened induction cookers to be opened, and the controller controls the main air valve 109 to be opened; the controller controls the first frequency converter to adjust the working frequency of the motor of the exhaust fan 101 to be between 30Hz and 50Hz, and adjusts the opening of the main air valve 109 according to the air pressure information in the exhaust main pipe 102 monitored by the air pressure sensor 106.

Further optionally, step 102 includes:

step 1021: when the first pressure difference sensor monitors that the indoor and outdoor pressure difference does not meet the pressure difference threshold value of the indoor and outdoor pressure difference, the controller controls the fresh air valve 203 of the fresh air handling unit 201 to be opened according to the indoor and outdoor pressure difference monitored by the first pressure difference sensor, and controls the second frequency converter to adjust the working frequency of the motor of the fresh air handling unit 201 corresponding to the opened fresh air valve 203 until the indoor and outdoor pressure difference meets the pressure difference threshold value of the indoor and outdoor pressure difference;

step 1022: when the first pressure difference sensor monitors that the indoor and outdoor pressure difference meets the pressure difference threshold value of the indoor and outdoor pressure difference, all the fresh air units do not operate.

It is easy to understand that the opening number of the fresh air damper 203 is more than or equal to 1;

it should be noted that, the "how many" the fresh air valves 203 of the fresh air handling unit 201 are controlled to open by the controller according to the indoor and outdoor pressure differences monitored by the first pressure difference sensor "is not limited herein, and may be selected by a person skilled in the art according to engineering needs, in some embodiments, the relationship between the" indoor and outdoor pressure differences "and the" how many the fresh air valves 203 are opened "may be obtained by an algorithm according to experimental data or historical data, so that the controller may control the fresh air valves 203 of the fresh air handling unit 201 to open according to the" indoor and outdoor pressure differences monitored by the first pressure difference sensor "by the controller;

for example, a first pressure difference sensor of a restaurant monitors that indoor and outdoor pressure differences do not satisfy an indoor and outdoor pressure difference threshold, a controller opens the fresh air damper 203 according to the specific indoor and outdoor pressure differences monitored by the first pressure difference sensor and controls the number of opened fresh air dampers 203 (which means how many fresh air units 201 are opened and how many fresh air units are operated if how many fresh air dampers 203 are opened), and the controller controls a second frequency converter (which means that the second frequency converter corresponds to the opened fresh air damper 203) to adjust the operating frequency of the motor of the fresh air unit 201 corresponding to the opened fresh air damper 203 until the indoor and outdoor pressure differences do not satisfy the indoor and outdoor pressure differences.

Specifically, optionally, step 102 further includes:

step 1023: when the air supply temperature of the fresh air handling unit 201 monitored by the first temperature sensor 205 is higher than the upper limit of the air supply temperature setting value, the controller decreases the opening degree of the water supply port of the chilled water three-way valve (decreases the chilled water supply amount) and increases the opening degree of the water return port of the chilled water three-way valve (increases the chilled water return amount); when the air supply temperature of the fresh air handling unit 201 monitored by the first temperature sensor 205 is lower than the lower limit of the air supply temperature setting value, the controller increases the opening degree of the water supply port of the chilled water three-way valve (increases the chilled water supply amount) and decreases the opening degree of the water return port of the chilled water three-way valve (decreases the chilled water return amount); when the supply air temperature of the fresh air handling unit 201 monitored by the first temperature sensor 205 is less than the upper limit of the supply air temperature setting value and greater than the lower limit of the supply air temperature setting value, the water supply port of the chilled water three-way valve maintains the current opening degree and the water return port of the chilled water three-way valve maintains the current opening degree.

It should be noted that the manner of "the controller controls the opening degrees of the water supply port of the chilled water three-way valve and the water return port of the chilled water three-way valve" is not limited herein, and may be selected by a person skilled in the art according to engineering needs.

Step 1024: when the return water temperature of the chilled water monitored by a second temperature sensor on the fresh air handling unit 201 is lower than a fourth preset value, the controller controls the electric heat tracing on the fresh air handling unit 201 to work, and meanwhile, the controller sends out a low-temperature alarm and controls a second frequency converter to stop the fresh air handling unit 201 from running until the return water temperature of the chilled water is greater than or equal to the fourth preset value, and the electric heat tracing stops working; when the return water temperature of the chilled water monitored by the second temperature sensor on the fresh air handling unit 201 is greater than or equal to the fourth preset value, the electric tracing does not work.

It is easy to understand that "controlling the second frequency converter to stop the operation of the fresh air handling unit 201" means that the controller controls the second frequency converter to make the operating frequency of the motor of the fresh air handling unit 201 zero.

For example, if the fourth preset value is 8 degrees, and the air supply temperature of a certain fresh air handling unit 201 is 5 degrees, the controller receives the air supply temperature monitored by the temperature sensor and controls the electric tracing on the fresh air handling unit 201 to be turned on until the air supply temperature of the fresh air handling unit 201 is greater than or equal to 8 degrees.

Further optionally, step 103 includes:

when the indoor humidity monitored by the humidity sensor is greater than a fifth preset value, the controller controls the return air valve 206 of the fresh air unit with the dehumidification function to be opened according to the received indoor humidity monitored by the humidity sensor, the controller controls the fresh air valve 203 of the fresh air unit with the dehumidification function to be closed, and the controller controls the second frequency converter to adjust the working frequency of the motor of the fresh air unit 201 of the fresh air unit with the dehumidification function so as to perform return air dehumidification;

when the indoor humidity monitored by the humidity sensor is less than or equal to the fifth preset value, the controller controls the return air valve 206 of the fresh air unit with the dehumidification function to be closed according to the received indoor humidity monitored by the humidity sensor, and the controller controls the second frequency converter to adjust the working frequency of the motor of the fresh air unit 201 to be zero.

It is easy to understand that when the indoor humidity is greater than the fifth preset value, return air dehumidification is needed, and the fresh air supplementing function is closed; when the indoor humidity is less than or equal to the fifth preset value, return air dehumidification is not needed, and the fresh air supplementing function is started.

It should be noted that, in the embodiments of the present invention, the manner of "the controller controls the second frequency converter to adjust the operating frequency of the motor of the fresh air handling unit 201 of the fresh air unit having the dehumidification function according to the received indoor humidity monitored by the humidity sensor" is not limited, and may be selected by a person skilled in the art according to engineering requirements, and in some embodiments, the manner of "the controller controls the second frequency converter to adjust the operating frequency of the motor of the fresh air handling unit 201 of the fresh air unit having the dehumidification function according to the received indoor humidity monitored by the humidity sensor" may be, but is not limited to: according to experimental data or historical data, the relation between the indoor humidity and the working frequency of the motor of the fresh air unit 201 of the fresh air unit with the dehumidification function is obtained through an algorithm.

In some embodiments, when the humidity values monitored by the return air humidity sensor at the return air inlet and the indoor humidity sensor are equal and equal to the fifth preset value, no return air dehumidification is performed.

For example, if the fifth preset value is 55%, the indoor humidity monitored by the controller via the humidity sensor is 50%, at this time, the controller controls the return air valve 206 to close, the controller controls the fresh air valve 203 to open, and the controller controls the second frequency converter to adjust the operating frequency of the motor of the fresh air handling unit 201 to be zero (the operating frequency of the motor of the fresh air handling unit 201 is zero, that is, the fresh air handling unit 201 does not operate);

assuming that the fifth preset value is 55%, the indoor humidity monitored by the humidity sensor received by the controller is 70%, at this time, the return air valve 206 of the fresh air unit with the dehumidification function is controlled to be opened by the controller, the fresh air valve 203 of the fresh air unit with the dehumidification function is controlled to be closed by the controller, and the second frequency converter is controlled by the controller to adjust the working frequency of the motor of the fresh air unit 201 of the fresh air unit with the dehumidification function, so that return air dehumidification is performed.

According to the control method of the ground exhaust system provided by the embodiment, the exhaust fan 101 is started through the controller according to the starting condition of the induction cooker monitored by the current transformer 104, so that the energy waste caused by the fact that the exhaust fan 101 is always started because the customer satisfaction is reduced and the exhaust fan 101 is forgotten to be closed due to untimely starting of the exhaust fan 101 by personnel in the prior art is avoided; the controller controls the main air valve 109 to be started or closed according to the start-stop state of the induction cooker monitored by the current transformer 104 and the air pressure information in the exhaust main pipe 102 monitored by the air pressure sensor 106, and controls the first frequency converter to adjust the working frequency of the motor of the exhaust fan 101, so that the working frequency of the motor of the exhaust fan 101 is adjusted according to actual needs, the electricity charge is saved, and the operation cost of a store is further reduced; the ground exhaust subsystem 100 provided by the embodiment does not need to operate all day long, and only needs to operate when customers exist, so that the loss caused by the all day operation of the exhaust fan 101 is reduced, the service life of the exhaust fan 101 is prolonged, the energy waste is avoided, the electricity charge is saved, and the operation cost of a store is reduced;

according to the control method of the ground exhaust system provided by the embodiment, the controller is adopted to control the fresh air unit 201 according to the indoor and outdoor pressure difference monitored by the first pressure difference sensor to supplement fresh air indoors, so that the defect that in the prior art, a store operator needs to open and adjust the fresh air unit 201 according to the directly observed exhaust opening condition and personal experience is overcome, more effective adjustment of the fresh air is realized, energy waste caused by improper adjustment of the fresh air unit 201 is avoided, and the store operation cost is reduced; the opening and closing of the return air valve 206 of the fresh air unit with the dehumidification function is controlled through the controller according to the indoor humidity monitored by the humidity sensor, so that the return air dehumidification is carried out indoors, store condensate water is avoided, and the dining experience of customers is improved.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.

It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.

It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims

1. A floor air exhaust system, characterized in that the floor air exhaust system comprises:

2. The ground exhaust system of claim 1 wherein the ground exhaust subsystem comprises: the air-conditioning system comprises an exhaust fan, an exhaust main pipe, a plurality of exhaust vertical pipes, a current transformer and a tail end air valve;

the main exhaust pipe is connected with an air inlet of the exhaust fan;

3. The ground exhaust system of claim 2 wherein the ground exhaust subsystem further comprises:

4. The ground exhaust system of claim 2 wherein the ground exhaust subsystem further comprises: the bypass air pipe is communicated with the exhaust main pipe and used for providing outdoor air supplement for adjusting the air pressure of the ground exhaust system when the opening quantity of the induction cookers is lower than a preset quantity;

5. The earth exhaust system of claim 1 wherein the fresh air subsystem comprises: the system comprises a first pressure difference sensor, a humidity sensor and at least two fresh air units;

the controller is used for controlling the at least two fresh air units to supply fresh air indoors according to indoor and outdoor pressure differences monitored by the first pressure difference sensor, and controlling the at least two fresh air units to return air and dehumidify indoors according to indoor humidity monitored by the humidity sensor.

6. The earth exhaust system according to claim 5 wherein each of the fresh air units includes: the fresh air pipeline is connected with an air inlet of the fresh air unit; a fresh air valve and a first temperature sensor are sequentially arranged in the fresh air pipeline from the outdoor direction to the indoor direction;

7. The earth exhaust system according to claim 6, wherein each of the fresh air units further comprises:

8. The system according to claim 5, wherein each fresh air unit further comprises a second pressure difference sensor for monitoring the pressure difference between two sides of the filter screen of the fresh air handling unit;

9. The earth exhaust system according to claim 5 wherein one of the at least two fresh air units further comprises: the air return pipeline is communicated with the fresh air pipeline between the fresh air valve and the air inlet of the fresh air unit, and the return air valve is arranged in the air return pipeline;

10. A method of controlling a geo-exhaust system according to any one of claims 1 to 9, characterised in that the method includes: