CN115218365B - Bypass adjusting method and corresponding fresh air fan - Google Patents
Bypass adjusting method and corresponding fresh air fan Download PDFInfo
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- CN115218365B CN115218365B CN202210817385.5A CN202210817385A CN115218365B CN 115218365 B CN115218365 B CN 115218365B CN 202210817385 A CN202210817385 A CN 202210817385A CN 115218365 B CN115218365 B CN 115218365B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000001514 detection method Methods 0.000 claims description 9
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000011084 recovery Methods 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Classifications
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
-
- 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
-
- 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
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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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
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/79—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling the direction of the supplied air
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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
-
- 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
-
- 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
- F24F2110/20—Humidity
-
- 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
- F24F2110/20—Humidity
- F24F2110/22—Humidity of the outside air
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/56—Heat recovery units
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a bypass adjusting method and a corresponding fresh air machine. The bypass adjustment method comprises the following steps: s1: detecting indoor and outdoor temperatures and relative humidity; s2: judging whether the outdoor temperature is within a preset temperature range S3: comparing the outdoor relative humidity with the set humidity, and if the outdoor relative humidity is larger than the set humidity, entering a step S4; if less than or equal to, go to step S5; s4: operating in a full bypass mode and returning to step S1; s5: calculating an opening and closing angle according to the measured relative humidity and temperature, and then entering step S6; s6: and (3) adjusting the opening and closing angle of the bypass valve according to the opening and closing angle calculated in the step (S3), and returning to the step (S1). According to the invention, the air quantity passing through the heat exchange channel and the bypass channel is automatically regulated by detecting the indoor and outdoor temperatures and the humidity of the air heater in real time, so that the energy consumption is effectively saved, and the comfort level of a user is improved.
Description
Technical Field
The invention relates to a bypass adjusting method, and also relates to a new fan using the bypass adjusting method, belonging to the technical field of air conditioning.
Background
The main function of the fresh air device is to send outdoor fresh air into the room and discharge indoor polluted air to the outside. The fresh air device can recover energy in the air discharged from the room during ventilation and is used in the air to be sent to the room. This process is called energy recovery. The energy recovery ratio of the general fresh air equipment is about 65%, that is, about 65% of energy in the exhaust air can be recovered for air supply.
The energy recovery function of the fresh air equipment can save energy consumption and reduce cost. Moreover, the purpose of energy recovery is not only energy saving, but also ensuring that the air delivered into the room is comfortable, for example, warm indoor air is used to heat the outdoor air and then deliver the heated air into the room in winter. However, when energy is recovered, the internal resistance of the fresh air device is relatively high, and the power consumption is increased. Therefore, currently, some fresh air devices have a special mode, the bypass mode. When outdoor air is comfortable, such as in spring and autumn, the outdoor air can be directly sent into a room, and energy recovery is not needed. The opening and closing of this mode is controlled by a bypass valve, so the bypass mode is called.
In the bypass mode, the internal resistance of the fresh air equipment is reduced, and the power consumption is reduced. The bypass valve is opened and closed in two ways: manual and automatic. If the user feels that the outdoor air is comfortable, the mode may be manually turned on, and the bypass mode may be turned off when the user feels that the outdoor air is uncomfortable. The manual mode operation is cumbersome. The current bypass automatic control is again either a fully open or a fully closed mode. FIG. 1 is a schematic diagram of an automatic control flow of a conventional bypass valve. As shown in fig. 1, the conventional automatic control method for bypass of fresh air equipment is to continuously detect the outdoor temperature, then determine whether the outdoor temperature is within a range set by a user, and if so, switch to a bypass mode; and if not, adopting a heat exchange mode. That is, the conventional fresh air device has only two modes, namely a bypass mode and a heat exchange mode, and accordingly, a bypass valve of the conventional fresh air device is either opened or closed, and no part of the conventional fresh air device is opened.
However, the fully open or fully closed control manner cannot meet the air mixing requirement of the bypass and the fresh air exchange at the same time. Therefore, a fresh air device is needed, and meanwhile, the control of the bypass valve can be of various opening and closing degrees, so that the mixed air effect of fresh air and return air with different proportions is realized, and the use requirements of the fresh air device under different weather conditions are met.
Disclosure of Invention
The invention aims to provide a bypass adjusting method.
Another technical problem to be solved by the present invention is to provide a fresh air machine using the bypass adjustment method.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
according to a first aspect of an embodiment of the present invention, there is provided a bypass adjustment method including the steps of:
s1: detecting indoor and outdoor temperatures and relative humidity;
s2: judging whether the outdoor temperature is within a preset temperature range;
s3: comparing the outdoor relative humidity with the set humidity, and if the outdoor relative humidity is larger than the set humidity, entering a step S4; if less than or equal to, go to step S5;
s4: operating in a full bypass mode and returning to step S1;
s5: calculating an opening and closing angle according to the measured relative humidity and temperature, and then entering step S6;
s6: and (3) adjusting the opening and closing angle of the bypass valve according to the opening and closing angle calculated in the step (S3), and returning to the step (S1).
Wherein preferably said step S5 comprises the sub-steps of:
calculating to obtain a fresh air enthalpy value i (OA) based on detection values of an outdoor temperature sensor and an outdoor humidity sensor; and obtaining an air supply enthalpy value i (SA) after mixing air based on the detection values of the indoor temperature sensor and the indoor humidity sensor.
Wherein preferably, in the step S5, the heat exchange channel supply enthalpy value i (SA 2 ) Satisfies the following formula:
wherein i (SA 1 ) The bypass passage air supply enthalpy value is represented, Q (SA) represents the total air quantity, and Q (SA) 1 ) Represents the bypass duct air supply quantity, Q (SA 2 ) Representing the air supply quantity of the heat exchange channel.
Wherein preferably, in the step S5, the heat exchange channel supply enthalpy value i (SA 2 ) Satisfies the following formula:
wherein η represents the total enthalpy exchange efficiency, i (OA) 1 ) Represents the fresh air enthalpy value of the bypass channel, i (SA 2 ) The air flow enthalpy value of the heat exchange channel is represented by i (RA), the return air enthalpy value is represented by i (RA), and the air volume ratio coefficient is represented by a.
Wherein preferably, the air volume ratio coefficient a=0.03k 2 -0.28k+1.25，
Wherein k is the ratio of fresh air quantity to return air quantity, and the following formula is satisfied:
wherein preferably, the opening and closing angle satisfies the following formula:
bypass opening/closing angle=k×maximum opening/closing angle.
According to a second aspect of embodiments of the present invention, there is provided a fresh air machine using the bypass adjustment method described above.
Wherein preferably, the fresh air fan comprises a shell, an outdoor temperature sensor, an outdoor humidity sensor, an indoor temperature sensor, an indoor humidity sensor, a heat exchanger, a bypass channel and a bypass valve,
the bypass valve adjusts the opening and closing angle according to the detection values of the outdoor temperature sensor, the outdoor humidity sensor, the indoor temperature sensor and the indoor humidity sensor so as to change the air quantity passing through the heat exchanger and the bypass channel.
Wherein, preferably, the shell is provided with a fresh air inlet, a return air inlet, an air supply outlet and an air outlet; the outdoor temperature sensor and the outdoor humidity sensor are arranged at the fresh air port; the indoor temperature sensor and the indoor humidity sensor are arranged at the air return opening.
Compared with the prior art, the bypass adjusting method and the corresponding fresh air machine automatically adjust the air quantity passing through the heat exchange channel and the bypass channel by detecting the indoor and outdoor temperatures and the humidity of the air heater in real time, thereby effectively saving energy consumption and improving the comfort level of users.
Drawings
FIG. 1 is a schematic diagram of an automatic control flow of a conventional bypass valve;
fig. 2 is a schematic structural diagram of a fresh air machine according to an embodiment of the present invention;
FIG. 3 is a flow chart of a bypass adjustment method according to an embodiment of the present invention.
Detailed Description
The technical contents of the present invention will be described in detail with reference to the accompanying drawings and specific examples.
Referring to fig. 2, the fresh air fan provided in the embodiment of the invention at least includes: a metal casing 1, an outdoor temperature sensor 21, an outdoor humidity sensor 22, an indoor temperature sensor 23, an indoor humidity sensor 24, a heat exchanger 4, a bypass passage 5, and a bypass valve 6. The shell 1 is provided with a fresh air port 31, a return air port 32, an air supply port 33 and an air outlet 34. The outdoor temperature sensor 21 and the outdoor humidity sensor 22 are arranged at the fresh air port 31; the indoor temperature sensor 23 and the indoor humidity sensor 24 are disposed at the return air inlet 32.
The bypass valve 6 adjusts the opening and closing angle according to the detection values of the outdoor temperature sensor, the outdoor humidity sensor, the indoor temperature sensor and the indoor humidity sensor to change the air quantity passing through the heat exchanger and the bypass passage. That is, the bypass valve 6 can adjust the opening and closing angle, and further control the ratio of fresh air entering the heat exchanger 4 and the bypass passage 5.
When the heat exchange mode is used, the bypass valve 6 is closed, indoor air is introduced from the return air inlet 32 (abbreviated as RA), outdoor air is introduced from the fresh air inlet 31 (abbreviated as OA), energy (including temperature and humidity) in the air discharged from the indoor is recovered therefrom through the heat exchanger 4, and then the outdoor air is introduced from the supply air inlet 33 (abbreviated as SA) into the indoor, and the indoor air is discharged from the outdoor through the exhaust air outlet 34 (abbreviated as EA).
When the hybrid ventilation mode provided by the present invention is used, the bypass valve 6 is opened in accordance with the calculated opening degree, and the outdoor air is introduced from the fresh air port 31, wherein a part of the air is introduced directly into the room from the supply port 33 through the bypass valve 6 without passing through the heat exchanger 4 (as indicated by solid arrows in fig. 2). Another part of the air passes through the heat exchanger 4 and then directly into the room from the air supply opening 33 (as indicated by the hollow arrow in fig. 2).
When the full bypass mode is used, the bypass valve 6 is fully opened, outdoor air enters from the fresh air port 31, and all air passes through the bypass valve 6 without passing through the heat exchanger 4, and enters the room directly from the supply port 33.
Next, the bypass adjustment method provided by the present invention is described with reference to fig. 2, and includes the following steps.
S1: the indoor and outdoor temperatures and relative humidity are detected.
Through setting up at the outdoor temperature sensor of fresh air inlet and at the indoor temperature sensor of return air inlet to and set up at the outdoor humidity sensor of fresh air inlet and at the indoor humidity sensor of return air inlet, real-time detection is indoor and outdoor temperature, relative humidity, obtains outdoor dry bulb temperature t1, outdoor relative humidity H1 and indoor dry bulb temperature t2 and indoor relative humidity H2. Then, the process advances to step S2.
In this step, the detection can be performed periodically, for example, every 1 minute; detection may also be triggered, for example, by receiving a user instruction.
S2: it is determined whether the outdoor temperature is within a preset temperature range.
Judging whether the outdoor dry bulb temperature t1 is within a temperature range set by a user according to the outdoor dry bulb temperature t1 detected in the step S1, if not, operating the fresh air fan according to a heat exchange mode, and returning to the step S1; otherwise, step S3 is entered.
When the air conditioner works in the heat exchange mode, the bypass valve is closed, and all fresh air passes through the heat exchanger without passing through the bypass air duct. This is a normal mode of operation and is not described in detail herein.
It should be noted that, since the fresh air fan is mainly used in the case of the solar heat, the case that the indoor temperature is higher than the outdoor temperature (i.e., the winter is not considered) is not considered. The outdoor temperature is not determined to be within a predetermined temperature range, that is, it means that the outdoor temperature is higher than the indoor temperature or higher than the maximum value of the predetermined temperature range. For example, when the temperature range preset by the user is 16 to 32 degrees and the outdoor temperature is higher than 32 degrees (for example, in summer), it is determined in step S1 that the temperature range is not within the temperature range, and the operation in the heat exchange mode is required. Here, the case where the outdoor temperature is lower than 16 degrees is not considered, and the fresh air fan stops operating at this time.
S3: comparing the outdoor relative humidity with the set humidity, and if the outdoor relative humidity is larger than the set humidity, entering a step S4; if less than or equal to, step S5 is entered.
The user presets his desired indoor relative humidity as the set humidity, for example 60%. The outdoor relative humidity H1 detected in step S1 is compared with the set humidity.
When the outdoor relative humidity H1 is less than or equal to the set humidity, the outdoor drying is indicated, but the temperature is proper, and the outdoor fresh air is not easy to directly send into the room. Therefore, it is necessary to mix the outdoor fresh air with the indoor return air. Or when the outdoor relative humidity H1 is judged to be greater than the set humidity in the step, the temperature and the humidity of the outdoor fresh air are proper, and the outdoor fresh air can be directly fed into the room. Therefore, the full bypass mode is adopted without mixing air, and the process proceeds to step S4.
S4: operate in full bypass mode and return to step S1.
The fresh air machine operates in a full bypass mode, i.e., the opening and closing angle is 90 degrees or 180 degrees (i.e., the maximum opening and closing angle). At this time, the outdoor fresh air is not passed through the heat exchanger, and all the fresh air enters the room from the bypass valve.
S5: and calculating an opening and closing angle according to the measured relative humidity and temperature, and then proceeding to step S6.
If the outdoor relative humidity is less than or equal to the set humidity, the fresh air machine needs to work according to a mixed mode, so that heat exchange and bypass are operated simultaneously. In this mode, the bypass opening and closing angle needs to be calculated by data.
The following specifically describes a calculation method of the bypass opening and closing angle:
the enthalpy value (i) and the enthalpy wet amount (d) can be obtained from the indoor and outdoor dry bulb temperatures (t) and the relative humidity (H) obtained by the actual measurement in step S1. That is, the indoor and outdoor real-time temperature and relative humidity are obtained in step S1, the vapor partial pressure (Pq) is obtained, and the enthalpy value (i) and the enthalpy wet amount (d) are obtained.
Specifically, the outdoor dry bulb temperature T1 is detected by an outdoor temperature sensor, and the corresponding outdoor kelvin temperature T1 is calculated by equation 1. Similarly, the room kelvin temperature T2 is obtained by using the measured value of the room temperature sensor.
Kelvin temperature T=dry bulb temperature (T) +273.15 (1)
And substituting the outdoor Kelvin temperature T1 and the indoor Kelvin temperature T2 into the following formula 2 to obtain the outdoor saturated steam partial pressure and the indoor saturated steam partial pressure (unit Pa).
Saturated vapor partial pressure Pq, b=exp (C8/kelvin temperature t+c9+c10 kelvin temperature t+c11 kelvin temperature t≡2+c12 kelvin temperature t≡3+c13 ln (kelvin temperature T)) (2)
The psychrometric chart shows c8= -5800.2206, c9= 1.3914993, c10= -0.04860239, c11= 0.000041764768, c12= -0.000000014452093, and c13= 6.5459673.
Then, based on the outdoor humidity detected by the outdoor humidity sensor and the indoor humidity detected by the indoor humidity sensor, and the outdoor saturated vapor partial pressure and the indoor saturated vapor partial pressure, respectively, the following formula 3 is substituted to obtain the outdoor vapor partial pressure and the indoor vapor partial pressure.
Partial pressure of water vapor pq=relative humidity h×pq, b (3)
Then, the outdoor moisture content and the indoor moisture content are obtained by substituting the outdoor moisture partial pressure and the indoor moisture partial pressure into the following formula 4, respectively.
Moisture content d=622×pq/(101325-Pq) (4)
Finally, based on the outdoor dry bulb temperature t1, the outdoor moisture content and the indoor moisture content, substituting the outdoor moisture content, the indoor moisture content and the outdoor moisture content into the following formula 5 to obtain an outdoor enthalpy value and an indoor enthalpy value.
Enthalpy i=1.01 dry bulb temperature t+0.001 moisture content d g/kg (2501+1.84 dry bulb temperature t) (5)
Wherein, kelvin temperature and dry bulb temperature are in units of DEG C, water vapor partial pressure is Pa, moisture content is in units of g/kg, and enthalpy value is in units of kj/kg.
In the mixed mode, i (SA 1 ) I (SA) 2 ) And (3) representing.
As described above, i (OA) and i (RA) can be obtained from the detected values measured by the sensors by using equations 1 to 5, i (SA) can be obtained from the temperatures and relative humidities preset by the user by using equations 1 to 5, and the fresh air bypass duct satisfies i (SA 1 )＝i(OA)。
On this basis, the opening and closing angle is calculated as follows.
In the mixed mode, the following is satisfied: q (SA) 1 )+Q(SA 2 )＝Q(SA) (6)
Wherein Q (SA) is a value preset by a user, is the total air quantity of air supply, and the air quantity Q (SA) of the bypass channel 1 ) And the heat exchange channel air supply quantity Q (SA 2 ) The total air quantity Q (SA) and the opening and closing angle of the real-time bypass valve can be obtained. Namely, the bypass air volume Q (SA 1 ) And the heat exchange air quantity Q (SA 2 ) The sum is the total air quantity Q (SA).
Due to conservation of the product of enthalpy and air volume, namely:
substitution of formula (6) into formula (7) yields:
i (SA) was obtained using the method 8 2 )。
In addition, under the condition that the air quantity of the air supply and the air discharge is equal, the full enthalpy exchange efficiency eta is as follows:
using equation 8, η is obtained.
Where η represents the total enthalpy exchange efficiency, i (OA) represents the fresh air enthalpy value, i (SA) represents the supply air enthalpy value, and i (RA) represents the return air enthalpy value.
In the actual working condition, the air quantity of the air sent and exhausted is unequal, so the full enthalpy exchange efficiency eta x under the actual working condition meets the following conditions:
η x ＝a×η (10)
the eta value is the performance value of the heat exchanger and can be calculated through testing; a is the air volume ratio coefficient.
Combining equation (9) and equation (10), and because the bypass channel is the same in temperature and humidity as the fresh air, i (SA 1 )＝i(OA)＝i(OA 1 ) The following formula can be obtained:
i(SA 2 )＝i(OA 1 )-aη[i(OA 1 )-i(RA)] (11)
thereby finding
Wherein η represents the total enthalpy exchange efficiency, i (OA 1) represents the fresh air enthalpy value of the bypass passage, i (SA 2) represents the supply air enthalpy value of the heat exchange passage, and i (RA) represents the return air enthalpy value.
The air volume ratio coefficient a can be obtained by the expression (12).
And because the air volume ratio coefficient a=0.03k 2 -0.28k+1.25 (13)
Wherein k is the ratio of fresh air quantity to return air quantity, and the following formula is satisfied:
therefore, k can be calculated by combining the formulas (8), (12), (13) and (14).
Finally, the opening and closing angle of the bypass valve is calculated by using k, and the opening and closing angle is shown as the following formula:
bypass open/close angle=k×maximum open/close angle (15)
For example, if the maximum opening and closing angle is 90 degrees, k=0.1, the bypass opening and closing angle is 9 degrees.
From equations 3, 4, and 5, the opening and closing angle of the bypass valve can be calculated.
S6: and (3) adjusting the opening and closing angle of the bypass valve according to the opening and closing angle calculated in the step (S3), and returning to the step (S1).
Compared with the prior art, the invention automatically adjusts the air quantity passing through the heat exchange channel and the bypass channel by detecting the indoor and outdoor temperatures and the humidity of the air heater in real time, thereby saving energy consumption and improving comfort level. Under the condition of proper temperature and humidity, the bypass mode is utilized to save energy to the greatest extent; and under the condition of proper temperature and improper humidity, the air mixing mode is utilized, and the requirements of energy conservation and comfort are met.
The bypass adjusting method and the corresponding fresh air fan provided by the invention are described in detail. Any obvious modifications to the present invention, without departing from the spirit thereof, would constitute an infringement of the patent rights of the invention and would take on corresponding legal liabilities.
Claims (6)
1. A bypass adjustment method, comprising the steps of:
s1: detecting indoor and outdoor temperatures and relative humidity;
s2: judging whether the outdoor temperature is within a preset temperature range;
s3: comparing the outdoor relative humidity with the set humidity, and if the outdoor relative humidity is larger than the set humidity, entering a step S4; if less than or equal to, go to step S5;
s4: operating in a full bypass mode and returning to step S1;
s5: calculating an opening and closing angle according to the measured relative humidity and temperature, and then entering step S6;
s6: according to the opening and closing angle calculated in the step S5, the opening and closing angle of the bypass valve is adjusted, and then the step S1 is returned;
wherein, the step S5 comprises the following substeps:
calculating to obtain a fresh air enthalpy value i (OA) based on detection values of an outdoor temperature sensor and an outdoor humidity sensor; obtaining an air supply enthalpy value i (SA) after mixing air based on detection values of an indoor temperature sensor and an indoor humidity sensor;
in the step S5, the heat exchange path supply enthalpy value i (SA 2 ) Satisfies the following formula:
wherein i (SA 1 ) The bypass passage air supply enthalpy value is represented, Q (SA) represents the total air quantity, and Q (SA) 1 ) Represents the bypass duct air supply quantity, Q (SA 2 ) Represents the air supply quantity of the heat exchange channel, eta represents the full enthalpy exchange efficiency, i (OA) 1 ) Represents the fresh air enthalpy value of the bypass channel, i (SA 2 ) The air flow enthalpy value of the heat exchange channel is represented by i (RA), the return air enthalpy value is represented by i (RA), and the air volume ratio coefficient is represented by a.
2. The bypass adjustment method according to claim 1, characterized in that the air volume ratio coefficient a=0.03 k 2 -0.28k+1.25, wherein k is the ratio of fresh air quantity to return air quantity, and the following formula is satisfied:
3. the bypass adjustment method as recited in claim 2, wherein the opening and closing angle satisfies the following equation:
bypass opening/closing angle=k×maximum opening/closing angle.
4. A fresh air fan characterized in that the bypass adjustment method according to any one of claims 1 to 3 is used.
5. The fresh air machine of claim 4, comprising a housing, an outdoor temperature sensor, an outdoor humidity sensor, an indoor temperature sensor, an indoor humidity sensor, a heat exchanger, a bypass passage, a bypass valve,
the bypass valve adjusts the opening and closing angle according to the detection values of the outdoor temperature sensor, the outdoor humidity sensor, the indoor temperature sensor and the indoor humidity sensor so as to change the air quantity passing through the heat exchanger and the bypass channel.
6. The fresh air machine of claim 5, wherein:
the shell is provided with a fresh air port, a return air port, an air supply port and an air outlet; the outdoor temperature sensor and the outdoor humidity sensor are arranged at the fresh air port; the indoor temperature sensor and the indoor humidity sensor are arranged at the air return opening.
Priority Applications (1)
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