CN111140976A - Fresh air conditioning system and control method thereof - Google Patents
Fresh air conditioning system and control method thereof Download PDFInfo
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- CN111140976A CN111140976A CN202010051657.6A CN202010051657A CN111140976A CN 111140976 A CN111140976 A CN 111140976A CN 202010051657 A CN202010051657 A CN 202010051657A CN 111140976 A CN111140976 A CN 111140976A
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- heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/007—Ventilation with forced flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/81—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the air supply to heat-exchangers or bypass channels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
- F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
- F24F12/006—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an air-to-air heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
Abstract
The invention relates to a fresh air conditioning system and a control method thereof, wherein the fresh air conditioning system comprises: the first main air duct is provided with a first air port and a second air port, the second main air duct is provided with a third air port and a fourth air port, the first air port and the third air port are both communicated with the outdoor space, and the second air port and the fourth air port are both communicated with the indoor space; the first heat exchanger is used for exchanging heat with the first main air duct and the second heat exchanger is used for exchanging heat with the second main air duct; in the heating mode, one of the first heat exchanger and the second heat exchanger serves as a condenser, the other one serves as an evaporator, a main air duct exchanging heat with the condenser serves as a fresh air duct, and a main air duct exchanging heat with the evaporator serves as a return air duct. In the heating mode, the indoor return air enters the outdoor space from the return air duct and exchanges heat with the evaporator in the process of flowing through the return air duct, and the evaporator cannot frost because the temperature of the indoor return air is higher than that of the outdoor space, so that continuous heating without defrosting is realized.
Description
Technical Field
The invention relates to the technical field of air conditioning, in particular to a fresh air conditioning system and a control method thereof.
Background
When the air conditioning system operates in heating, the surface of the outdoor heat exchanger is frosted under the influence of the ambient temperature and the relative humidity. Under the condition of a certain ambient temperature, the higher the relative humidity is, the higher the frosting speed of the outdoor heat exchanger is, and the higher the heating attenuation of the air conditioning system is. Therefore, the air conditioning system requires frequent defrosting during heating.
However, the air conditioning system will cause the indoor thermal comfort to decline when defrosting, and environmental test results show: the indoor temperature is reduced by 2-7 ℃ in the defrosting period, and the indoor temperature needs 10-20 min before defrosting is recovered.
Disclosure of Invention
Therefore, it is necessary to provide a fresh air conditioning system and a control method thereof, which are not prone to frosting, for solving the problem that the conventional air conditioning system is prone to frosting.
A fresh air conditioning system comprising:
the air conditioner comprises a first main air duct and a second main air duct, wherein the first main air duct is provided with a first air opening and a second air opening, the second main air duct is provided with a third air opening and a fourth air opening, the first air opening and the third air opening are both communicated with an outdoor space, and the second air opening and the fourth air opening are both communicated with an indoor space;
the first heat exchanger is used for exchanging heat with the first main air duct and the second heat exchanger is used for exchanging heat with the second main air duct;
in the heating mode, one of the first heat exchanger and the second heat exchanger is used as a condenser, the other one is used as an evaporator, a main air duct exchanging heat with the condenser is used as a fresh air duct, and a main air duct exchanging heat with the evaporator is used as a return air duct.
In one embodiment, in the heating mode, the first heat exchanger serves as a condenser, the second heat exchanger serves as an evaporator, the first main air duct serves as a fresh air duct, and the second main air duct serves as a return air duct;
wherein, in the vertical direction, the second air opening is arranged below relative to the fourth air opening.
In one embodiment, in the cooling mode, the first heat exchanger serves as a condenser, the second heat exchanger serves as an evaporator, the second main air duct serves as a fresh air duct, and the first main air duct serves as a return air duct;
wherein, in the vertical direction, the second air opening is arranged below relative to the fourth air opening.
In one embodiment, the fresh air conditioning system further comprises a heat exchange core, and the first main air duct and the second main air duct can exchange heat through the heat exchange core.
In one embodiment, the first heat exchanger comprises a first sub heat exchanger and a second sub heat exchanger, the first sub heat exchanger exchanges heat with the part of the first main air duct between the first air port and the heat exchange core, and the second sub heat exchanger exchanges heat with the part of the first main air duct between the second air port and the heat exchange core;
in the heating mode, the second sub-heat exchanger serves as a condenser, the second heat exchanger serves as an evaporator, the first main air duct serves as a fresh air duct, the second main air duct serves as a return air duct, and the first sub-heat exchanger selectively serves as a condenser to work according to the temperature of the first air port.
In one embodiment, in the cooling mode, the second heat exchanger serves as an evaporator, at least one of the first sub heat exchanger and the second sub heat exchanger serves as a condenser, the second main air duct serves as a fresh air duct, and the first main air duct serves as a return air duct.
In one embodiment, the fresh air conditioning system further comprises a first bypass air duct, a second bypass air duct, a first bypass valve and a second bypass valve, the first bypass air duct is connected in parallel with a first branch formed by the first heat exchanger and the heat exchange core, the second bypass air duct is connected in parallel with a second branch formed by the second heat exchanger and the heat exchange core, the first bypass valve is assembled on the first bypass air duct, and the second bypass valve is assembled on the second bypass air duct;
in the bypass mode, the heat exchange core, the first heat exchanger and the second heat exchanger are stopped, and the first bypass valve and the second bypass valve are opened.
In one embodiment, the fresh air conditioning system further comprises an internal circulation air duct and an internal circulation valve, two ends of the internal circulation air duct are respectively connected with the first main air duct and the second main air duct, and the internal circulation valve is assembled on the internal circulation air duct;
and in the internal circulation mode, the internal circulation valve is opened, and the second air port is communicated with the fourth air port.
In one embodiment, the fresh air conditioning system further comprises a first fan and a second fan, the first fan is arranged in the first main air duct, and the second fan is arranged in the second main air duct;
the first fan is used for enabling wind to flow in the first main air duct in a forward and reverse direction, and the second fan is used for enabling wind to flow in the second main air duct in the forward and reverse direction.
In one embodiment, the fresh air conditioning system further includes a first filter screen and a second filter screen, the first filter screen is disposed in the first main air duct, and the second filter screen is disposed in the second main air duct.
A control method of a fresh air conditioning system comprises the following steps:
acquiring the indoor temperature of an indoor space and the outdoor temperature of an outdoor space;
when the indoor temperature is less than or equal to a target temperature and the value that the target temperature is greater than the outdoor temperature is greater than or equal to a first preset threshold value, controlling the fresh air conditioning system to enter a heating mode;
in the heating mode, one of the first heat exchanger and the second heat exchanger serves as a condenser, the other one serves as an evaporator, a main air duct exchanging heat with the condenser serves as a fresh air duct, and a main air duct exchanging heat with the evaporator serves as a return air duct.
In one embodiment, the method further comprises the following steps:
when the indoor temperature is less than or equal to the target temperature and the value that the target temperature is greater than the outdoor temperature is less than the first preset threshold value, controlling the fresh air conditioning system to enter a fresh air mode;
and in the fresh air mode, the first heat exchanger and the second heat exchanger are shut down, and the first main air duct and the second main air duct exchange heat through the heat exchange core.
In one embodiment, when the indoor temperature is less than or equal to a target temperature, and the value that the target temperature is greater than the outdoor temperature is greater than or equal to a first preset threshold, the step of controlling the fresh air conditioning system to enter a heating mode includes:
when the outdoor temperature is lower than a second preset threshold value, the first sub heat exchanger works as a condenser;
the second sub heat exchanger is used as a condenser, the second heat exchanger is used as an evaporator, the first sub heat exchanger exchanges heat with the part, located between the first air port and the heat exchange core, of the first main air duct, and the second sub heat exchanger exchanges heat with the part, located between the second air port and the heat exchange core, of the first main air duct.
In one embodiment, the method further comprises the following steps:
when the indoor temperature is higher than the target temperature and the value of the outdoor temperature which is higher than the target temperature is larger than or equal to a third preset threshold value, controlling the fresh air conditioning system to enter a refrigeration mode;
in the refrigeration mode, the first heat exchanger is used as a condenser, the second heat exchanger is used as an evaporator, the second main air duct is used as a fresh air duct, the first main air duct is used as a return air duct, and the second air opening is arranged below the fourth air opening in the vertical direction.
In one embodiment, when the indoor temperature is higher than the target temperature and the outdoor temperature is higher than the target temperature by a value less than a third preset threshold, the fresh air conditioning system is controlled to enter a fresh air mode;
and in the fresh air mode, the first heat exchanger and the second heat exchanger are shut down, and the first main air duct and the second main air duct exchange heat through the heat exchange core.
In one embodiment, before controlling the fresh air conditioning system to enter the heating mode when the indoor temperature is less than or equal to a target temperature and the target temperature is greater than or equal to a first preset threshold value, the method further includes the steps of:
judging whether the absolute value of the difference value between the target temperature and the outdoor temperature is smaller than a fourth preset threshold value or not;
if so, controlling the fresh air conditioning system to enter a bypass mode;
if not, judging whether the indoor temperature is less than or equal to the target temperature and whether the value of the target temperature which is greater than the outdoor temperature is greater than or equal to the first preset threshold value;
in the bypass mode, the heat exchange core, the first heat exchanger and the second heat exchanger are stopped, the first bypass valve and the second bypass valve are opened, and the fourth preset threshold is smaller than the first preset threshold.
According to the fresh air conditioning system and the control method thereof, in the heating mode, outdoor fresh air enters the indoor space from the fresh air duct, and exchanges heat with the condenser in the process of flowing through the fresh air duct, and hot air after heat exchange flows into the indoor space from the fresh air duct; the indoor return air enters the outdoor space from the return air duct and exchanges heat with the evaporator in the process of flowing through the return air duct, and the evaporator cannot be frosted due to the fact that the temperature of the indoor return air is higher than that of the outdoor space, so that continuous heating without defrosting is achieved.
Drawings
Fig. 1 is a schematic diagram of a fresh air conditioning system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the fresh air conditioning system shown in FIG. 1 in a heating mode;
FIG. 3 is a schematic diagram of the fresh air conditioning system shown in FIG. 1 in a cooling mode;
fig. 4 is a flowchart of a control method of a fresh air conditioning system according to another embodiment of the present invention;
fig. 5 is a logic diagram of a control method of a fresh air conditioning system according to another embodiment of the present invention.
100. A fresh air conditioning system; 10. a first main air duct; 11. a first tuyere; 12. a second tuyere; 20. a second main air duct; 21. a third tuyere; 22. a fourth tuyere; 31. a first sub heat exchanger; 32. a second sub heat exchanger; 40. a second heat exchanger; 50. a first fan; 60. a second fan; 70. a first filter screen; 80. a second filter screen; 90. a heat exchange core; 110. a first bypass air duct; 120. a second bypass duct; 130. a first bypass valve; 140. a second bypass valve; 150. an internal circulation air duct; 160. an internal circulation valve; 200. an outdoor space; 300. an indoor space; t1, target temperature; t2, outdoor temperature; t3, room temperature.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present invention provides a fresh air conditioning system 100, including a first main air duct 10 and a second main air duct 20, where the first main air duct 10 has a first air opening 11 and a second air opening 12, the second main air duct 20 has a third air opening 21 and a fourth air opening 22, the first air opening 11 and the third air opening 21 are both communicated with an outdoor space 200, and the second air opening 12 and the fourth air opening 22 are both communicated with an indoor space 300. One of the first main air duct 10 and the second main air duct 20 serves as a fresh air duct for allowing fresh air to flow to the indoor space 300 outdoors, and the other one of the first main air duct 10 and the second main air duct 20 serves as a return air duct for allowing return air to flow to the outdoor space 200 indoors.
The fresh air conditioning system 100 further includes a first heat exchanger (not shown) and a second heat exchanger 40, the first heat exchanger is used for exchanging heat with the first main air duct 10, and the second heat exchanger 40 is used for exchanging heat with the second main air duct 20. Referring to fig. 2, in the heating mode, one of the first heat exchanger and the second heat exchanger 40 serves as a condenser, the other serves as an evaporator, the main air duct exchanging heat with the condenser serves as a fresh air duct, and the main air duct exchanging heat with the evaporator serves as a return air duct.
Thus, in the heating mode, outdoor fresh air enters the indoor space 300 from the fresh air duct, exchanges heat with the condenser in the process of flowing through the fresh air duct, and hot air after heat exchange flows into the indoor space from the fresh air duct; the indoor return air enters the outdoor space 200 from the return air duct and exchanges heat with the evaporator in the process of flowing through the return air duct, and the evaporator cannot frost due to the fact that the temperature of the indoor return air is higher than that of the outdoor space 200, and therefore continuous heating without defrosting is achieved.
In one embodiment, the first main air duct 10 and the second main air duct 20 may be formed by enclosing a plurality of sheet metal parts. It is to be understood that, in other embodiments, the first main air duct 10 and the second main air duct 20 are not limited in forming manner.
Specifically, the first heat exchanger is disposed in the first main air duct 10, and the second heat exchanger 40 is disposed in the second main air duct 20. It is contemplated that in other embodiments, the first heat exchanger may be directly coupled to the first main air duct 10, and the second heat exchanger 40 may be directly coupled to the second main air duct 20, which is not limited herein.
In one embodiment, in the heating mode, the first heat exchanger functions as a condenser, the second heat exchanger 40 functions as an evaporator, the first main air duct 10 functions as a fresh air duct, and the second main air duct 20 functions as a return air duct. Specifically, the second tuyere 12 is disposed lower with respect to the fourth tuyere 22 in the vertical direction. Therefore, hot air blown out from the fresh air duct is blown into the room from the lower second air opening 12, and the indoor space 300 is filled by the floating hot air.
Further, the second air opening 12 is communicated with the bottom of the indoor space 300, that is, the first main air duct 10 extends to the floor of the indoor space 300, so that the hot air blown out from the fresh air duct is directly blown to the floor of the indoor space 300 from the second air opening 12, the fourth air opening 22 is communicated with the top of the indoor space 300, that is, the second main air duct 20 extends to the ceiling of the indoor space 300, so that the indoor return air is filled in the whole indoor space 300 and then enters the return air duct from the fourth air opening 22 to be blown outdoors, and the heating effect is ensured.
It is to be understood that, in another embodiment, the arrangement positions of the second tuyere 12 and the fourth tuyere 22 are not limited.
Referring to fig. 3, further, the fresh air conditioning system 100 may also be used for refrigeration, in which the first heat exchanger serves as a condenser, the second heat exchanger 40 serves as an evaporator, the second main air duct 20 serves as a fresh air duct, and the first main air duct 10 serves as a return air duct. The second tuyere 12 is disposed lower than the fourth tuyere 22 in the vertical direction. Therefore, cold air blown out from the fresh air duct is blown to the indoor from the fourth air opening 22 with a higher position, and the cold air sinks to fill the indoor space 300 conveniently.
Similarly, the fourth air opening 22 is communicated with the top of the indoor space 300, that is, the second main air duct 20 extends to the ceiling of the indoor space 300, so that the cold air blown out from the fresh air duct directly blows out from the ceiling of the indoor space 300 through the fourth air opening 22, and the second air opening 12 is communicated with the bottom of the indoor space 300, that is, the first main air duct 10 extends to the floor of the indoor space 300, so that the indoor return air is filled in the whole indoor space 300 and then enters the return air duct from the second air opening 12 to blow out to the outside, thereby ensuring the refrigeration effect.
With reference to fig. 1, the fresh air conditioning system 100 further includes a first fan 50 and a second fan 60, the first fan 50 is disposed in the first main air duct 10 for air to flow in the first main air duct 10, and the second fan 60 is disposed in the second main air duct 20 for air to flow in the second main air duct 20. Specifically, the first fan 50 is used for the wind to flow in the positive direction in the first main air duct 10, and the second fan 60 is used for the wind to flow in the positive direction and the negative direction in the second main air duct 60.
When it is defined that the direction in which the wind flows in the forward direction is a direction in which the outdoor space 200 points to the indoor space 300, the direction in which the wind flows in the reverse direction is a direction in which the indoor space 300 points to the outdoor space 200. It is understood that in other embodiments, it may also be defined that the direction of the wind flowing in the forward direction is the direction in which the indoor space 300 points to the outdoor space 200, and the direction of the wind flowing in the reverse direction is the direction in which the outdoor space 200 points to the indoor space 300.
Thus, when the first main air duct 10 is used as an air inlet duct and the second main air duct 20 is used as an air return duct, the first fan 50 can make the air flow in the first main air duct 10 in the forward direction, and the second fan 60 can make the air flow in the second main air duct 20 in the reverse direction; when the first main air duct 10 is used as a return air duct and the second main air duct 20 is used as a fresh air duct, the first fan 50 can make the air flow in the first main air duct 10 in the reverse direction, and the second fan 60 can make the air flow in the second main air duct 20 in the forward direction. With reference to fig. 1, the fresh air conditioning system 100 further includes a first filter 70 and a second filter 80, the first filter 70 is disposed in the first main air duct 10, and the second filter 80 is disposed in the second main air duct 20. Specifically, the first filter 70 is disposed near the first tuyere 11 with respect to the first fan 50, and the second filter 80 is disposed near the third tuyere 21 with respect to the second fan 60.
When the first main air duct 10 is used as the fresh air duct, the first filter 70 can filter the impurities carried in the outside air, and similarly, when the second main air duct 20 is used as the fresh air duct, the second filter 80 can filter the impurities carried in the outside air. And the sundries adhered to the first filter screen 70 can be blown away by controlling the first fan 50 to rotate reversely, and the sundries adhered to the second filter screen 80 can be blown away by controlling the second fan 60 to rotate reversely.
With reference to fig. 1, the fresh air conditioning system 100 further includes a heat exchanging core 90, and heat can be exchanged between the first main air duct 10 and the second main air duct 20 through the heat exchanging core 90 to recycle heat. Specifically, under the new trend mode, can control first heat exchanger and the shutdown of second heat exchanger 40, heat exchange core 90 starts, and the heat exchange between outdoor new trend and the indoor return air only goes on through heat exchange core 90.
The first heat exchanger comprises a first sub heat exchanger 31 and a second sub heat exchanger 32, the first sub heat exchanger 31 exchanges heat with a part of the first main air duct 10 between the first air opening 11 and the heat exchange core 90, and the second sub heat exchanger 32 exchanges heat with a part of the first main air duct 10 between the second air opening 12 and the heat exchange core 90. In the heating mode, the second sub heat exchanger 32 serves as a condenser, the second heat exchanger 40 serves as an evaporator, the first main air duct 10 serves as a fresh air duct, the second main air duct 20 serves as a return air duct, and the first sub heat exchanger 31 selectively serves as a condenser according to the temperature of the first air port 11.
When the temperature of the first air inlet 11 is lower than the second preset threshold value, it is proved that the external temperature is lower, when the external air flows to the heat exchange core 90 from the first main air duct 10 to exchange heat with the second main air duct 20, the heat exchange core 90 is easy to freeze at a lower temperature, and at this time, the first sub heat exchanger 31 is controlled to work as a condenser to heat the gas flowing to the heat exchange core 90 for heat exchange in advance, so that the heat exchange core 90 is prevented from freezing at a lower temperature.
In the cooling mode, the second heat exchanger 40 functions as an evaporator, and at least one of the first sub heat exchanger 31 and the second sub heat exchanger 32 functions as a condenser. Specifically, select first sub heat exchanger 31 as condenser work, indoor hot-blast at this moment is at first through the heat exchange core 90 heat transfer, then carries out thermal secondary reuse through first sub heat exchanger 31, so can select lower condensation temperature when designing first sub heat exchanger 31, and compressor power is littleer, and is energy-conserving more.
In a specific embodiment, the second heat exchanger 40 and the second main air duct 20 exchange heat with a portion between the fourth air opening 22 and the heat exchange core 90, so that, in the heating mode, when the second heat exchanger 40 is used as an evaporator, indoor hot air firstly passes through the second heat exchanger 40 and then flows to the heat exchange core 90 for heat exchange, thereby preventing the indoor hot air from flowing to the second heat exchanger 40 after the temperature of the indoor hot air is reduced by the heat exchange core 90, and ensuring that the second heat exchanger 40 continuously heats without defrosting.
With continued reference to fig. 1, in one embodiment, the fresh air conditioning system 100 further includes a first bypass duct 110, a second bypass duct 120, a first bypass valve 130 and a second bypass valve 140, the first bypass duct 110 is connected in parallel with a first branch formed by the first heat exchanger and the heat exchanging core 90, the second bypass duct 120 is connected in parallel with a second branch formed by the second heat exchanger 40 and the heat exchanging core 90, the first bypass valve 130 is mounted on the first bypass duct 110, and the second bypass valve 140 is mounted on the second bypass duct 120.
In the bypass mode, the heat exchange core 90, the first heat exchanger and the second heat exchanger 40 are stopped, and the bypass valve 130 and the second bypass valve 140 are opened, so that the wind resistance of the wind flowing in the wind channel can be reduced.
Further, the fresh air conditioning system 100 further includes an internal circulation air duct 150 and an internal circulation valve 160, two ends of the internal circulation air duct 150 are respectively connected to the first main air duct 10 and the second main air duct 20, and the internal circulation valve 160 is assembled on the internal circulation air duct 150. When the outdoor air is bad, the fresh air conditioning system 100 is controlled to enter the internal circulation mode, and at this time, the internal circulation valve 160 is opened, and the indoor air conditioner circulates.
Specifically, the connection point of the internal circulation air duct 150 and the first main air duct 10 is located between the second sub heat exchanger 32 and the heat exchange core 90, and the connection point of the internal circulation air duct 150 and the second main air duct 20 is located between the second heat exchanger 40 and the heat exchange core 90. So configured, when entering the internal circulation mode, the fresh air conditioning system 100 can perform dehumidification. When dehumidification, indoor return air firstly reduces the temperature through second heat exchanger 40 (evaporimeter), reduces humidity, then again through the second heat exchanger 32 (condenser) increase in temperature, reaches indoor constant temperature dehumidification's effect, has guaranteed the travelling comfort.
The working modes of the fresh air conditioning system 100 provided by the specific embodiment of the invention are as follows:
referring to fig. 2, heating mode:
the first main air duct 10 is used as a fresh air duct, the second main air duct 20 is used as a return air duct, the second sub heat exchanger 32 is used as a condenser, the second heat exchanger 40 is used as an evaporator, the first fan 50 enables the air to flow in the first main air duct 10 in the forward direction, and the second fan 60 enables the air to flow in the second main air duct 20 in the reverse direction.
When the outdoor temperature T2 is less than the second preset threshold, the first sub heat exchanger 31 operates as a condenser, and when the outdoor temperature T2 is greater than or equal to the second preset threshold, the first sub heat exchanger 31 does not operate. The operation of the first sub heat exchanger 31 will be described as an example.
When heating, outdoor fresh air enters the first main air duct 10 from the first air port 11 under the action of the first fan 50, and continues to flow to the second air port 12 after being filtered by the first filter screen 70. In the process of flowing to the second tuyere 12, the heat exchange core 90 exchanges heat with the first sub heat exchanger 31 serving as a condenser and then flows to the heat exchange core 90, and the heat exchange core 90 is prevented from being frozen due to the high temperature after exchanging heat with the first sub heat exchanger 31. After passing through the heat exchange core 90, the outdoor fresh air exchanges heat with the second sub-heat exchanger 32 serving as a condenser to form hot air, and the hot air flows to the floor of the indoor space 300 from the second air inlet 12. After the hot air floats up in the indoor space 300 to fill the whole indoor space 300, and flows into the second main duct 20 from the fourth air opening 22 located at the ceiling by the second fan 60, the indoor return air flows into the outdoor space 200 after exchanging heat with the second heat exchanger 40 as an evaporator in the process of flowing into the third air opening 21. Because the air used for heat exchange of the second heat exchanger 40 of the evaporator is the indoor return air, the indoor return air temperature is higher, the evaporator is prevented from frosting, and the fresh air conditioning system 100 is ensured to be heated continuously without defrosting.
Referring to fig. 3, cooling mode:
the second main air duct 20 is used as a fresh air duct, the first main air duct 10 is used as a return air duct, the first sub heat exchanger 31 is used as a condenser, the second sub heat exchanger 32 does not work, the second heat exchanger 40 is used as an evaporator, the first fan 50 enables air to flow in the first main air duct 10 in a reverse direction, and the second fan 60 enables air to flow in the second main air duct 20 in a forward direction.
During refrigeration, outdoor fresh air enters the second main air duct 20 from the third air port 21 under the action of the second fan 60, continues to flow to the fourth air port 22 after being filtered by the second filter screen 80, exchanges heat with the heat exchange core 90 in the process of flowing to the fourth air port 22, flows to the second heat exchanger 40 serving as an evaporator and exchanges heat with the second heat exchanger to form cold air, and the cold air flows to the ceiling of the indoor space 300 from the fourth air port 22. After the cold air sinks in the indoor space 300 and fills the whole indoor space 300, the cold air flows into the first main air duct 10 from the second air opening 12 located on the floor under the action of the first fan 50, and in the process of flowing to the first air opening 11, the indoor return air exchanges heat with the first sub heat exchanger 31 serving as a condenser again after passing through the heat exchange core 90 (secondary utilization of energy is realized).
Fresh air mode:
the first heat exchanger and the second heat exchanger 40 are both shut down, the heat exchange core 90 is started, and heat exchange between outdoor fresh air and indoor return air is only carried out through the heat exchange core 90.
Bypass mode:
the first heat exchanger, the second heat exchanger 40 and the heat exchange core 90 are all stopped, the first bypass valve 130 and the second bypass valve 140 are all opened, at the moment, the outdoor fresh air and the indoor return air flow through the bypass air duct, and heat exchange is not carried out between the outdoor fresh air and the indoor return air.
An internal circulation mode:
the heat exchange core 90 is stopped, the internal circulation valve 160 is opened, and the indoor return air circulates back and forth in the internal circulation air duct 150. Specifically, the second heat exchanger 40 and the second sub heat exchanger 32 operate to perform dehumidification of the indoor space 300.
In this embodiment, the heat exchanger, the fan, the filter screen, and the total heat exchange core 90 of the fresh air conditioning system 100 are all disposed in the indoor unit, and the compressor of the fresh air conditioning system 100 is also disposed in the indoor unit.
It is understood that in other embodiments, the fresh air conditioning system 100 further includes an outdoor unit, the compressor is disposed in the outdoor unit, and the outdoor unit further includes a third heat exchanger, so that when the fresh air conditioning system 100 is in the above-mentioned internal circulation mode, the fresh air conditioning system 100 can also cool or heat the indoor space 300. Specifically, when the third heat exchanger is used as a condenser, and the second heat exchanger 40 and the second sub heat exchanger 32 are used as evaporators, the refrigeration of the indoor space 300 can be realized; when the third heat exchanger serves as an evaporator and the second heat exchanger 40 and the second sub heat exchanger 32 serve as condensers, heating of the indoor space 300 can be achieved. Referring to fig. 4, another embodiment of the present invention further provides a control method of the fresh air conditioning system 100, including the steps of:
s110: acquiring an indoor temperature T3 of the indoor space 300 and an outdoor temperature T2 of the outdoor space 200;
specifically, when the first main duct 10 functions as a fresh air duct and the second main duct 20 functions as a return air duct, the outdoor temperature T2 can be obtained by detecting the temperature of the first air opening 11, and the indoor temperature T3 can be obtained by detecting the temperature of the fourth air opening 22. When the first main duct 10 serves as a return air duct and the second main duct 20 serves as a fresh air duct, the outdoor temperature T2 can be obtained by detecting the temperature of the third air opening 21, and the indoor temperature T3 can be obtained by detecting the temperature of the second air opening 12.
S120: when the indoor temperature T3 is less than or equal to the target temperature T1 and the value that the target temperature T1 is greater than the outdoor temperature T2 is greater than or equal to a first preset threshold, controlling the fresh air conditioning system 100 to enter a heating mode; in the heating mode, one of the first heat exchanger and the second heat exchanger 40 serves as a condenser, the other serves as an evaporator, the main air duct exchanging heat with the condenser serves as a fresh air duct, and the main air duct exchanging heat with the evaporator serves as a return air duct.
That is, when the indoor temperature T3 is less than or equal to the target temperature T1, and the value that the target temperature T1 is greater than the outdoor temperature T2 is greater than or equal to the first preset threshold, it is determined that the indoor space 300 needs to be heated, and the fresh air conditioning system 100 is controlled to enter the heating mode.
Thus, in the heating mode, outdoor fresh air enters the indoor space 300 from the fresh air duct, exchanges heat with the condenser in the process of flowing through the fresh air duct, and hot air after heat exchange flows into the indoor space from the fresh air duct; the indoor return air enters the outdoor space 200 from the return air duct and exchanges heat with the evaporator in the process of flowing through the return air duct, and the evaporator cannot frost due to the fact that the temperature of the indoor return air is higher than that of the outdoor space 200, and therefore continuous heating without defrosting is achieved.
Referring to fig. 5, step S120 includes the steps of:
when the outdoor temperature T2 is less than the second preset threshold, the first sub heat exchanger 31 operates as a condenser; the second sub heat exchanger 32 is used as a condenser, the second heat exchanger 40 is used as an evaporator, the first sub heat exchanger 31 exchanges heat with a part of the first main air duct 10 between the first air opening 11 and the heat exchange core 90, and the second sub heat exchanger 32 exchanges heat with a part of the first main air duct 10 between the second air opening 12 and the heat exchange core 90.
That is, when the outdoor temperature T2 is less than the second preset threshold, if the outdoor fresh air directly flows to the heat exchange core 90 for heat exchange, the heat exchange core 90 may freeze, and at this time, the first sub heat exchanger 31 is controlled to operate as a condenser, and the outdoor fresh air is first heated to ensure that the temperature of the outdoor fresh air flowing to the heat exchange core 90 is high, so that the heat exchange core 90 is ensured not to freeze.
With continued reference to fig. 5, in an embodiment, the method for controlling the fresh air conditioning system 100 further includes, before step S110, the steps of:
judging whether the absolute value of the difference value between the target temperature T1 and the outdoor temperature T2 is smaller than a fourth preset threshold value or not;
if so, controlling the fresh air conditioning system 100 to enter a bypass mode;
if not, judging whether the indoor temperature T3 is less than or equal to the target temperature T1 or not, and whether the value of the target temperature T1 which is greater than the outdoor temperature T2 is greater than or equal to a first preset threshold value or not; in the bypass mode, the heat exchange core 90, the first heat exchanger and the second heat exchanger 40 are stopped, the first bypass valve 130 and the second bypass valve 140 are opened, and the fourth preset threshold is smaller than the first preset threshold.
That is, it is determined whether the absolute value of the difference between the target temperature T1 and the outdoor temperature T2 is smaller than a fourth preset threshold, and if the absolute value is smaller than the fourth preset threshold, it is determined that the difference between the outdoor temperature T2 and the target temperature T1 is very small, and at this time, heat exchange is not required, and circulation of indoor and outdoor air is required.
With continued reference to fig. 5, in one embodiment, the method for controlling the fresh air conditioning system 100 further includes the steps of:
when the indoor temperature T3 is less than or equal to the target temperature T1 and the value that the target temperature T1 is greater than the outdoor temperature T2 is less than a first preset threshold value, controlling the fresh air conditioning system 100 to enter a fresh air mode; in the fresh air mode, the first heat exchanger and the second heat exchanger 40 are stopped, and the first main air duct 10 and the second main air duct 20 exchange heat through the heat exchange core 90.
That is, when the value of the target temperature T1 being greater than the outdoor temperature T2 is smaller than the first preset threshold value and the indoor temperature T3 being less than or equal to the target temperature T1, it is proved that the difference between the outdoor temperature T2 and the target temperature T1 is not very large, the fresh air conditioning system 100 is controlled to enter the fresh air mode, and at this time, heat exchange (heat recovery) is performed only through the heat exchange core 90.
With continued reference to fig. 5, in one embodiment, the method for controlling the fresh air conditioning system 100 further includes the steps of:
when the indoor temperature T3 is greater than the target temperature T1 and the value that the outdoor temperature T2 is greater than the target temperature T1 is greater than or equal to a third preset threshold, controlling the fresh air conditioning system 100 to enter a cooling mode;
in the cooling mode, the first heat exchanger serves as a condenser, the second heat exchanger 40 serves as an evaporator, the second main air duct 20 serves as a fresh air duct, the first main air duct 10 serves as a return air duct, and the second air opening 12 is arranged below the fourth air opening 22 in the vertical direction.
That is, when the value that the outdoor temperature T2 is greater than the target temperature T1 is greater than or equal to the third preset threshold value and the indoor temperature T3 is greater than the target temperature T1, it is determined that the indoor space 300 needs to be cooled, and the fresh air conditioning system 100 is controlled to enter the cooling mode.
In another embodiment, when the value of the outdoor temperature T2 being greater than the target temperature T1 is less than the third preset threshold and the indoor temperature T3 being greater than the target temperature T1, the fresh air conditioning system 100 is controlled to enter the fresh air mode; in the fresh air mode, the first heat exchanger and the second heat exchanger 40 are stopped, and the first main air duct 10 and the second main air duct 20 exchange heat through the heat exchange core 90.
That is, when the value of the outdoor temperature T2 greater than the target temperature T1 is smaller than the third preset threshold value and the indoor temperature T3 is greater than the target temperature T1, it is also proved that the difference between the outdoor temperature T2 and the target temperature T1 is not very large, and the fresh air conditioning system 100 is also controlled to enter the fresh air mode, and at this time, heat exchange (heat recovery) is performed only through the heat exchange core 90.
It should be noted that the first preset threshold, the second preset threshold, the third preset threshold and the fourth preset threshold are all positive values, and can be set as required.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (16)
1. A fresh air conditioning system, comprising:
the air conditioner comprises a first main air duct (10) and a second main air duct (20), wherein the first main air duct (10) is provided with a first air opening (11) and a second air opening (12), the second main air duct (20) is provided with a third air opening (21) and a fourth air opening (22), the first air opening (11) and the third air opening (21) are communicated with an outdoor space (200), and the second air opening (12) and the fourth air opening (22) are communicated with an indoor space (300);
a first heat exchanger for exchanging heat with the first main air duct (10) and a second heat exchanger (40) for exchanging heat with the second main air duct (20);
in the heating mode, one of the first heat exchanger and the second heat exchanger (40) is used as a condenser, the other one is used as an evaporator, a main air duct exchanging heat with the condenser is used as a fresh air duct, and a main air duct exchanging heat with the evaporator is used as a return air duct.
2. Fresh air conditioning system according to claim 1, wherein in the heating mode, the first heat exchanger functions as a condenser, the second heat exchanger (40) functions as an evaporator, the first main air duct (10) functions as a fresh air duct, and the second main air duct (20) functions as a return air duct;
wherein, in the vertical direction, the second tuyere (12) is arranged downward relative to the fourth tuyere (22).
3. Fresh air conditioning system according to claim 1, wherein in the cooling mode, the first heat exchanger functions as a condenser, the second heat exchanger (40) functions as an evaporator, the second main air duct (20) functions as a fresh air duct, and the first main air duct (10) functions as a return air duct;
wherein, in the vertical direction, the second tuyere (12) is arranged downward relative to the fourth tuyere (22).
4. Fresh air conditioning system according to any of claims 1 to 3, further comprising a heat exchange core (90), wherein heat can be exchanged between the first main air duct (10) and the second main air duct (20) through the heat exchange core (90).
5. Fresh air conditioning system according to claim 4, wherein the first heat exchanger comprises a first sub heat exchanger (31) and a second sub heat exchanger (32), the first sub heat exchanger (31) exchanges heat with the portion of the first main air duct (10) between the first air opening (11) and the heat exchange core (90), and the second sub heat exchanger (32) exchanges heat with the portion of the first main air duct (10) between the second air opening (12) and the heat exchange core (90);
in the heating mode, the second sub heat exchanger (32) serves as a condenser, the second heat exchanger (40) serves as an evaporator, the first main air duct (10) serves as a fresh air duct, the second main air duct (20) serves as a return air duct, and the first sub heat exchanger (31) can selectively serve as a condenser to work according to the temperature of the first air port (11).
6. Fresh air conditioning system according to claim 5, wherein in cooling mode, the second heat exchanger (40) acts as an evaporator, at least one of the first sub-heat exchanger (31) and the second sub-heat exchanger (32) acts as a condenser, the second main air duct (20) acts as a fresh air duct, and the first main air duct (10) acts as a return air duct.
7. Fresh air conditioning system according to claim 4, characterized in that it further comprises a first bypass duct (110), a second bypass duct (120), a first bypass valve (130) and a second bypass valve (140), said first bypass duct (110) being connected in parallel with a first branch formed by said first heat exchanger and said heat exchange core (90), said second bypass duct (120) being connected in parallel with a second branch formed by said second heat exchanger (40) and said heat exchange core (90), said first bypass valve (130) being fitted on said first bypass duct (110), said second bypass valve (140) being fitted on said second bypass duct (120);
wherein, in a bypass mode, the heat exchange core (90), the first heat exchanger and the second heat exchanger (40) are shut down, and the first bypass valve (130) and the second bypass valve (140) are opened.
8. The fresh air conditioning system according to claim 1, further comprising an internal circulation air duct (150) and an internal circulation valve (160), wherein both ends of the internal circulation air duct (150) are respectively connected with the first main air duct (10) and the second main air duct (20), and the internal circulation valve (160) is mounted on the internal circulation air duct (150);
wherein, in the inner circulation mode, the inner circulation valve (160) is opened, and the second tuyere (12) is communicated with the fourth tuyere (22).
9. The fresh air conditioning system as claimed in claim 1, further comprising a first fan (50) and a second fan (60), wherein the first fan (50) is disposed in the first main air duct (10), and the second fan (60) is disposed in the second main air duct (20);
the first fan (50) is used for enabling wind to flow in the first main air duct (10) in the forward and reverse directions, and the second fan (60) is used for enabling the wind to flow in the second main air duct (20) in the forward and reverse directions.
10. The fresh air conditioning system according to claim 1, further comprising a first filter (70) and a second filter (80), wherein the first filter (70) is disposed in the first main air duct (10), and the second filter (80) is disposed in the second main air duct (20).
11. A control method of a fresh air conditioning system is characterized by comprising the following steps:
acquiring an indoor temperature (T3) of an indoor space (300) and an outdoor temperature (T2) of an outdoor space (200);
when the indoor temperature (T3) is less than or equal to a target temperature (T1) and the value that the target temperature (T1) is greater than the outdoor temperature (T2) is greater than or equal to a first preset threshold value, controlling the fresh air conditioning system to enter a heating mode;
in the heating mode, one of the first heat exchanger and the second heat exchanger (40) is used as a condenser, the other one is used as an evaporator, a main air duct exchanging heat with the condenser is used as a fresh air duct, and a main air duct exchanging heat with the evaporator is used as a return air duct.
12. The control method of the fresh air conditioning system according to claim 11, further comprising the steps of:
when the indoor temperature (T3) is less than or equal to the target temperature (T1) and the value that the target temperature (T1) is greater than the outdoor temperature (T2) is less than the first preset threshold value, controlling the fresh air conditioning system to enter a fresh air mode;
under the fresh air mode, the first heat exchanger and the second heat exchanger (40) are shut down, and the first main air duct (10) and the second main air duct (20) exchange heat through a heat exchange core (90).
13. The method for controlling the fresh air conditioning system according to claim 11, wherein when the indoor temperature (T3) is less than or equal to a target temperature (T1) and the target temperature (T1) is greater than the outdoor temperature (T2) by a value greater than or equal to a first preset threshold, the method for controlling the fresh air conditioning system to enter the heating mode comprises the steps of:
when the outdoor temperature (T2) is less than a second preset threshold value, the first sub heat exchanger (31) works as a condenser;
the second sub heat exchanger (32) is used as a condenser, the second heat exchanger (40) is used as an evaporator, the first sub heat exchanger (31) exchanges heat with the part, located between the first air port (11) and the heat exchange core (90), of the first main air duct (10), and the second sub heat exchanger (32) exchanges heat with the part, located between the second air port (12) and the heat exchange core (90), of the first main air duct (10).
14. The control method of the fresh air conditioning system according to claim 11, further comprising the steps of:
when the indoor temperature (T3) is higher than the target temperature (T1) and the outdoor temperature (T2) is higher than the target temperature (T1) by a value greater than or equal to a third preset threshold value, controlling the fresh air conditioning system to enter a cooling mode;
in the refrigeration mode, the first heat exchanger serves as a condenser, the second heat exchanger (40) serves as an evaporator, the second main air duct (20) serves as a fresh air duct, the first main air duct (10) serves as a return air duct, and the second air opening (12) is arranged below the fourth air opening (22) in the vertical direction.
15. The control method of the fresh air conditioning system according to claim 14, wherein when the indoor temperature (T3) is higher than the target temperature (T1) and the outdoor temperature (T2) is higher than the target temperature (T1) by a value less than the third preset threshold, the fresh air conditioning system is controlled to enter a fresh air mode;
under the fresh air mode, the first heat exchanger and the second heat exchanger (40) are shut down, and the first main air duct (10) and the second main air duct (20) exchange heat through a heat exchange core (90).
16. The control method of fresh air conditioning system according to any one of claims 11-15, wherein before controlling the fresh air conditioning system to enter the heating mode when the indoor temperature (T3) is equal to or less than the target temperature (T1) and the target temperature (T1) is greater than the outdoor temperature (T2) by a value equal to or greater than a first preset threshold value, the method further comprises the steps of:
determining whether an absolute value of a difference between the target temperature (T1) and the outdoor temperature (T2) is less than a fourth preset threshold;
if so, controlling the fresh air conditioning system to enter a bypass mode;
if not, judging whether the indoor temperature (T3) is less than or equal to the target temperature (T1) or not, and whether the value of the target temperature (T1) which is greater than the outdoor temperature (T2) is greater than or equal to the first preset threshold value or not;
in the bypass mode, the heat exchange core (90), the first heat exchanger and the second heat exchanger (40) are shut down, the first bypass valve (130) and the second bypass valve (140) are opened, and the fourth preset threshold is smaller than the first preset threshold.
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