CN113719868B - Variable-frequency energy-saving method for centralized flue - Google Patents
Variable-frequency energy-saving method for centralized flue Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
- F24C15/2021—Arrangement or mounting of control or safety systems
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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
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- 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
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Abstract
A frequency conversion energy-saving method for a centralized flue comprises the following steps: monitoring and counting the simultaneous use coefficient of the flue; acquiring the change relation of the simultaneous use coefficient along with time according to the monitoring statistical data; acquiring a corresponding relation table of the simultaneous use coefficient variable quantity and the time node; acquiring a corresponding relation between the fan frequency conversion and a time node; and when the system operates, according to the current time node, sending an instruction to the variable frequency fan according to the corresponding relation between the fan frequency conversion and the time node so as to guide the fan frequency conversion. The invention can form the parameter basis of frequency conversion only by simple monitoring statistics in a period of time before the system is used; in the frequency conversion process, a repeated monitoring-feedback process is not needed, and only a frequency conversion instruction is sent out unidirectionally according to a time node; when the monitoring statistical data are accumulated to a certain degree, after big data are formed, each smoke exhaust port does not need to be monitored any more, and accurate model selection of the fan can be guided. The invention can be used for the oil smoke exhaust system of the high-rise residential kitchen centralized flue.
Description
Technical Field
The invention belongs to the technical field of building ventilation, and relates to a control method for centralized flue ventilation.
Background
The kitchen oil smoke contains a large amount of pollutants, the health problem caused by the kitchen oil smoke cannot be ignored, and the current conventional kitchen oil smoke pollution is controlled by adopting a range hood. Due to the common construction of high-rise residential buildings, the oil fume pollution of residential kitchens is collected by the range hood and then is uniformly discharged through the centralized flue.
The existing high-rise residential kitchen centralized flue oil fume exhaust system has a plurality of problems: the static pressure of the lower layer in the centralized flue is higher, the static pressure of the high layer is lower, and the unbalanced air exhaust problems of smaller air exhaust volume of the low-layer range hood and larger air exhaust volume of the high layer are easily caused; and when the range hood is not opened, the floor with higher static pressure of the flue has the vicious diseases of smoke channeling and smell channeling; due to the problems of smoke channeling and odor channeling and unbalanced air exhaust, the manufacturers of the range hoods begin to compete maliciously with the development trend of large air volume of the range hoods.
In order to solve the problems, the existing researchers mostly propose a mode of increasing the power of a roof fan to transfer the power of an indoor range hood and reduce indoor noise and static pressure in a flue. In the kitchen of the high-rise residence, the range hoods at all levels are not completely opened, and the simultaneous use coefficient exists. After the roof fan is added, when the opening number of the flue system is changed, the operation frequency of the roof fan is changed immediately to meet the requirement of air exhaust of each layer of the system, so that the roof fan operates in a frequency-dependent manner.
A patent 'a high-rise building negative pressure frequency conversion kitchen oil smoke pumping system' (CN 112610995A), relates to a high-rise building negative pressure frequency conversion kitchen oil smoke pumping system, a smoke ventilator detection unit is arranged on the smoke ventilator of each household and is configured to detect the on-off of the smoke ventilator of each household; the air outlet of each range hood is communicated to the flue through a range hood pipeline, and the one-way valve is arranged on the range hood pipeline; the one-way valve is arranged on a pipeline of the range hood; the variable frequency fan is arranged in the flue and is close to the air outlet of the flue; the purification device is arranged at the air outlet of the flue. And correspondingly adjusting the on-off and the rotating speed of the variable frequency fan according to the number and the power of the started range hoods detected by the range hood detection unit, so that the energy is saved and the emission is reduced.
The patent 'centralized variable-frequency smoke exhaust control method and device' (CN 109631120A) provides a centralized variable-frequency smoke exhaust control method and device, which are applied to a centralized smoke exhaust system, and by acquiring the floors of starting-up smoke machines, the outlet air volume and the outlet air pressure of a common flue are obtained according to the number of the starting-up smoke machines and the rated air volume of each starting-up smoke machine; according to the outlet air quantity, the outlet air pressure and the resistance coefficient, sequentially calculating the working air pressure of each starting-up range hood from top to bottom; calculating the target operation frequency of each starting-up cigarette machine according to the working wind pressure of each starting-up cigarette machine; and sending the target operation frequency of each starting-up cigarette machine to the corresponding starting-up cigarette machine so that the corresponding starting-up cigarette machine works according to the target operation frequency.
Patent "a method and a system for controlling air volume adjustment of a central flue system" (CN 112524663 a), discloses a method and a system for controlling air volume adjustment of a central flue system, the method for controlling air volume adjustment of a central flue system comprises: acquiring the working parameters of the range hood and transmitting the working parameters to the host; wherein, the working parameters comprise the working state of the range hood and the starting sequence number of the range hood; the host computer counts the number of all the range hoods in the working state and adjusts the target rotating speed according to the preset relation; the host machine adjusts the opening and closing angle of the electric valve according to the starting sequence number of the range hood and the relation between the preset range hood number, the starting sequence, the starting angle and the degressive angle; in the process, the distribution rule of the opening and closing angles is summarized and preset in the host in advance, and the distribution of the opening and closing angles is changed along with the number of the range hoods in the working state.
The patent "a novel high building kitchen fume extractor" (CN 203131918U) comprises control switch, exhaust hood, blast gate, flue, fan, converter, autonomous system, display screen, and its characterized in that control switch installs on the exhaust hood that does not take power, control switch on connect the time-recorder, the fan is connected with the blast gate through the flue, autonomous system is connecting control switch, converter, display screen, blast gate, converter connection fan. The state of the control switch of the exhaust hood is fed back to the automatic control system, so that the frequency conversion of the fan is controlled.
Patent "air volume changing device and air volume changing control method for high-rise residential kitchen centralized flue" (CN 106524265 a) air volume device and air volume changing control method, wherein the system comprises: the centralized flue penetrates through each floor of the high-rise residence; the kitchen smoke exhaust branch pipes are respectively positioned in each floor of the high-rise residence and are communicated with the centralized flue, and each kitchen smoke exhaust branch pipe is provided with a smoke ventilator; the roof fan is communicated with the top end of the centralized flue; a plurality of signal acquisition devices are respectively installed in every lampblack absorber and are used for collecting and sending the position signal and the start-stop signal of the lampblack absorber after the state of each lampblack absorber is identified: and the signal processing device is respectively connected with the signal acquisition device and the roof fan through the signal transmission channel so as to count the positions and the number of the opened range hoods and send a frequency conversion control instruction to the roof fan after receiving the position signal and the opening and closing signal.
In summary, the current frequency conversion control scheme for the kitchen flue roof fan of the high-rise residence mostly adopts a mode of monitoring the opening and closing position and the quantity of the tail end, and carries out frequency conversion control through the corresponding relation between the preset position/quantity and the frequency. The control mode seems to be simple, but a large amount of early calculation is needed, and the calculation results are different for different floor numbers, branch pipe forms, flue sizes, fire prevention valve/check valve resistance coefficients, so that the relation between the opening position/quantity and the frequency of the flue system which is not identical needs to be calculated once, the calculation process is complicated, the workload is large, the opening and closing state needs to be fed back in real time in the operation process, and the requirement on the whole set of control system is high.
Disclosure of Invention
The invention aims to provide a frequency conversion energy-saving method for a centralized flue, which utilizes statistical data of simultaneous use coefficients to carry out frequency conversion control on a fan.
In order to achieve the above purpose, the solution of the invention is as follows:
a frequency conversion energy-saving method for a centralized flue comprises the following steps:
step 4, acquiring the corresponding relation between the fan frequency conversion and the time node;
and 5, when the system runs, according to the current time node, sending an instruction to the variable frequency fan according to the corresponding relation between the fan frequency conversion and the time point so as to guide the fan frequency conversion.
Further, in the step 1, an electric power self-counting or temperature self-counting or on-off sensing monitor is adopted for monitoring and counting.
And 2, drawing a relation chart of the simultaneous use coefficient of the centralized flue system and time according to the monitoring statistical data, and obtaining the change relation of the simultaneous use coefficient along with the time.
And 3, processing the simultaneous use coefficient-time relation chart, and performing grading and segmentation processing on the chart to obtain a corresponding relation table of simultaneous use coefficient variable quantity and time nodes.
And 4, inversely calculating the opening quantity and the exhaust quantity of the flue according to the simultaneous use coefficient, inversely calculating the operating frequency of the fan according to the exhaust quantity, and finally obtaining the corresponding relation between the frequency conversion of the fan and the time node.
Optionally, calculating the fan frequency under the corresponding use coefficient according to the following formula (1),
in the formula, G run For actual operation of air volume, G design For designing the air volume, f run For the actual operating frequency, f design To design the frequency;
the actual operation air volume is calculated according to the following formula (2),
G run ＝g design ×N×ζ (2)
in the formula, g design The air quantity is designed for the single-layer range hood, N is the total number of floors, and zeta is the coefficient of simultaneous use.
Optionally, the centralized flue is a centralized flue of a residential kitchen, and the fan is arranged on a roof.
Optionally, the temperature self-meter is installed around the cooking bench, and the associated behavior characteristic of the range hood is started by a resident when the cooking bench is started; when the monitored temperature is higher than the indoor and outdoor temperatures, the cooking bench is considered to be opened at the moment, namely the range hood is opened; when the monitored temperature decreases abruptly, the hob is considered to be closed.
Optionally, converting the continuous smoothed temperature profile to a 0-1 coded digital step signal, wherein "0" indicates no cooking action and the flue is not used; "1" indicates cooking is being performed and the flue is in use; the number of the residents using the flue at the same time can be known by summing the data signals of the residents in the flue at the same time, so that the simultaneous use coefficient of the flue is calculated;
the opening and closing of the flue are identified by the slope of the curve, when the slope is changed from negative number or 0 to positive number, the turning point marks the beginning of cooking behavior, and the coded signal has a step from 0 to 1; when the slope changes from positive or 0 to negative, the turning point marks the end of the cooking action and the encoded signal appears as a 1-0 step.
Optionally, the fan is not turned on during the non-three meal time period.
Due to the adoption of the scheme, the invention has the beneficial effects that:
the frequency conversion energy-saving technology utilizing the statistical characteristics provided by the invention is irrelevant to the actual use state of a residential user, and complex and advanced calculation is not needed, and the technology is as follows:
(1) the parameter basis of frequency conversion can be formed only by simple monitoring statistics in a period of time before the system is used.
(2) In the frequency conversion process, a repeated monitoring-feedback process is not needed, and only a frequency conversion instruction is sent according to a single item of time point.
(3) When the monitoring statistical data are accumulated to a certain degree, after big data are formed, each house is not required to be monitored.
(4) The monitoring statistical data can be used for subsequent model selection design of the centralized fan, and accurate design of the centralized flue system is further completed (the multiple reference standard recommended values of the existing system are equal to 0.5 and 0.6, and the use coefficients are far lower than 0.5 and 0.6 when the system is operated in the centralized flue of the actual residential kitchen through a large amount of data).
Drawings
FIG. 1 is a flow chart of the present invention.
FIG. 2 is a schematic diagram of a statistical monitoring apparatus according to an embodiment of the present invention.
Fig. 3 is a distribution of simultaneous usage coefficients of 25 stories of a house over time in a day according to an embodiment of the present invention.
FIG. 4 is a graph showing the distribution of simultaneous usage coefficients of 25 stories of a house according to an embodiment of the present invention over time.
FIG. 5 is a graph showing the distribution of simultaneous usage coefficients of 14 stories of houses according to an embodiment of the present invention over time.
FIG. 6 is a schematic view of a flue system according to an embodiment of the present invention.
Wherein: the device comprises a kitchen 1, a temperature self-counting device 1-1, an electric power self-counting device 1-2, an opening and closing signal monitor 1-3, a flue 2, a variable frequency control cabinet 3 and a variable frequency fan 4.
Detailed Description
A frequency conversion energy-saving method for a centralized flue comprises the following steps:
(1) the statistical monitoring system is utilized to monitor and count the use coefficient of the residential concentrated flue at the same time, and can adopt the following equipment: electric power self-counting, or temperature self-counting, or on-off sensing monitor.
The electric power self-counting device is a socket converter, after the socket is inserted into the socket, the socket of the range hood is inserted into the converter again, the converter sends out a signal when the current is detected to flow, and the signal is recorded by a special signal monitor. The method mainly reflects the state of current increase after the range hood is started, and can reversely deduce the starting and closing time of the range hood through the time of current increase/decrease;
the temperature self-counting device is arranged around a cooking bench, and by utilizing the associated behavior characteristic that a resident opens the cooking bench to open the range hood, when the monitored temperature is greatly increased (greater than the indoor and outdoor temperature) or greatly reduced (reduced in jumping property), the cooking bench is considered to be closed at the moment, namely the range hood is closed. The probe of the opening and closing signal monitor is connected with the check valve of the range hood, and the opening and closing state of the check valve is monitored, so that the opening and closing of the range hood can be directly monitored, and the opening and closing time can be recorded.
(2) And drawing a relation chart of the simultaneous use coefficient of the centralized flue system and time according to the monitoring statistical data, and acquiring the change relation of the simultaneous use coefficient along with the time.
(3) And (4) processing the data by using a coefficient-time relation chart, and performing grading and segmentation processing on the chart to obtain a corresponding relation table of the variable quantity of the simultaneously used coefficient and the time node.
(4) And inversely calculating the opening quantity and the exhaust quantity of the flue according to the simultaneous use coefficient, inversely calculating the operating frequency of the roof fan according to the exhaust quantity, and finally obtaining the corresponding relation between the frequency conversion of the roof fan and the time node.
(5) When the system runs, an instruction is sent to the variable frequency fan according to the current time node so as to guide the fan to carry out frequency conversion.
The invention is described below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, a residential concentrated flue frequency conversion energy-saving method based on statistical characteristics includes the following steps:
s1, monitoring and counting the simultaneous use coefficient of the high-rise residential flue by using a statistical monitoring system, wherein the statistical monitoring system can adopt the following equipment: the temperature self-counting device 1-1, the electric power self-counting device 1-2 or the on-off signal monitor 1-3. The high-rise residence is a residence with 10 floors and more than 10 floors.
The installation locations of the three statistical monitoring devices are shown in fig. 2.
The temperature self-counting device 1-1 is arranged around a cooking bench, the associated behavior characteristic that a resident opens the cooking bench to start the range hood is utilized, and when the monitored temperature is greatly increased and is higher than the indoor and outdoor temperatures, the cooking bench is considered to be opened at the moment, namely the range hood is opened; when the monitored temperature drops substantially or abruptly, the cooking action is ended when the cooking top is closed.
Although this test method cannot reflect a case where the household continues to discharge the oil smoke after closing the cooktop, the time for continuing to discharge the oil smoke may be estimated, and in a practical case, the time for continuing to discharge the oil smoke after closing the cooktop of each household may be set to 5 minutes or 10 minutes.
The electric power self-counting device 1-2 is a socket converter, after it is inserted into the socket, the cooker hood socket is inserted into the converter again, the converter detects the current flowing and sends out a signal, which is recorded by a special signal monitor. The method mainly reflects the state of current increase after the range hood is started, and can reversely deduce the starting and closing time of the range hood through the time of current increase/decrease.
The start-stop signal monitor 1-3 probe is connected with the check valve of the range hood, and is directly used for monitoring the start-stop of the range hood and recording the start-stop time simultaneously by monitoring the start-stop state of the check valve.
In the embodiment, a usage temperature self-counting conference is used for describing usage statistics of high-rise residences of two different floors, the number of the floors of the two residences is 14 and 25 respectively, and the investigation time is one week.
S2, drawing a relation chart of the simultaneous use coefficient of the centralized flue system and time according to the monitoring statistical data, and obtaining the change relation of the simultaneous use coefficient along with the time.
Counting the change of the obtained temperature along with time into a continuous and smooth curve, processing the research data to obtain the use condition of the flue, and converting the continuous and smooth temperature curve into a digital step signal of 0-1 code, wherein 0 represents no cooking behavior, and the flue is not used; "1" indicates cooking is being performed and the flue is in use. The number of the residents using the flue at the same time can be known by summing the digital step signals of the residents in the flue at the same time, so that the simultaneous use coefficient of the flue is calculated.
The opening and closing of the flue are mainly identified by the slope of the curve, when the slope is changed from negative number or 0 to positive number, the turning point marks the beginning of cooking behavior, and the coded signal has a step from 0 to 1. When the slope changes from positive or 0 to negative, the turning point marks the end of the cooking action and the encoded signal appears as a 1-0 step. The encoded results of the cooking behavior of a day as shown in fig. 3 can be obtained with reference to this processing method. The C point and the D point also meet the slope characteristic of 0-1 coding, but the C point is an interference point caused by the influence of factors such as environment and the like, and the monitoring result is not included.
According to the above method, the present embodiment processes survey data of 2 houses of different heights for 7 consecutive days, and the results are shown in fig. 4 to 5. Meanwhile, the distribution of the use coefficients along with time presents three main waveforms all day long, and the time corresponding to the peak value of the waveforms is slightly earlier than the time of daily breakfast, lunch and dinner.
S3-processing uses the coefficient-time relation chart at the same time, and the chart is processed by hierarchical segmentation, and the processing is shown as a dotted line in the graphs shown in FIGS. 4 and 5, and the result of the dotted line is converted into a corresponding relation table of the coefficient and the time node at the same time, as shown in the second column of tables 1 and 2 below.
S4, according to the coefficient table used in the table 1 and the table 2, the opening number and the flue exhaust volume are easy to back calculate, then the operation frequency of the roof fan is back calculated according to the exhaust volume, and finally the corresponding relation between the frequency change of the roof fan and the time point is obtained. According to the positive correlation between the air quantity and the frequency, as shown in the formula (1), the fan frequency under the corresponding use coefficient can be calculated.
In the formula, G run For actual operation of air volume, G design For designing the air volume, f run For the actual operating frequency, f design To design the frequency.
In this embodiment, the design air volume of the roof fan corresponding to a 25-storey house is 9000m 3 The corresponding design and use coefficient is 0.6, and the design air volume of the range hood at each layer is 600m 3 H is the ratio of the total weight of the catalyst to the total weight of the catalyst. I.e. G design Is 9000m 3 /h，f design Is 50 HZ. The design air volume of the roof fan corresponding to the 14-storey residential building is 4800m 3 H, the designed air volume of each layer of range hood is 600m 3 H is used as the reference value. I.e. G design Is 4800m 3 /h，f design Is 50 HZ.
According to the above, the data of example 3 in table 1 and table 2 are substituted into formula (1) and formula (2), and the calculation result is rounded to obtain the data of the third column and the fourth column.
G run ＝g design ×n×ζ (2)
In the formula, g design The air quantity is designed for the single-layer range hood, n is the total number of floors, and zeta is the coefficient of simultaneous use.
Table 1 table of correspondence between utilization coefficient and time point in investigation of 25 stories of this embodiment
Table 2 table of the correspondence between the utilization coefficient and the time point in the investigation of the 14 stories of houses in this embodiment
S5, according to the corresponding relation between the first row of time nodes and the fourth row of fan frequency of the tables 1 and 2, the frequency conversion controller can control the frequency conversion by a timer in the frequency conversion controller, and when the time nodes are reached, a frequency conversion instruction is sent out, so that the frequency conversion of the roof fan is guided.
In the embodiment, it can be clearly seen that through statistical monitoring, the simultaneous use coefficient of kitchens of 25-storey houses and 14-storey houses is mainly concentrated in the three-meal time periods of morning, noon and evening, and the simultaneous use coefficient is far lower than 0.6 selected by the flue design of the houses, so that the problems of overlarge type selection of roof fans and overlarge flue area design are caused. If the fan does not operate in a frequency conversion mode, the fan operates at power frequency in the whole cooking time period, the resistance of a concentrated flue of a 25-storey house is about 300Pa, and the power consumption is about 6.25 kW.h all day by calculation according to the power consumption calculation formula (3); after the frequency conversion operation is adopted, the power consumption of the roof fan on the whole day is about 1.388 kW.h (as listed in Table 3), and the power consumption is saved by about 78%. The resistance of a concentrated flue of a 14-storey house is about 200Pa, and the power consumption of a roof fan is about 1.722 kW.h all day long when the roof fan runs at power frequency; after the frequency conversion operation is adopted, the power consumption of the all-day roof fan is about 0.586 kW.h (as listed in Table 4), and the power consumption is saved by about 66%. The power consumption comparison calculation does not comprise oil fume treatment equipment, if the oil fume treatment equipment exists, increment of a system pressure head, oil fume treatment consumables and the like need to be considered, and the potential of frequency conversion and energy conservation is huge.
In the formula, N is the shaft power of the fan, kW; q is the running air volume, m 3 H; eta is the product of the internal efficiency and the mechanical efficiency of the fan, and is taken as 0.8.
Table 3 calculation of power consumption in frequency conversion operation of 25 stories house in this embodiment
Table 4 calculation of power consumption in variable frequency operation of 14 stories house in this embodiment
In addition, it is worth explaining that, in the statistical result, it is shown that a small number of users use the flue in the non-three-meal time period, but because the number of the opened users is small, the positive pressure value in the flue is small, so that effective air exhaust of the range hood of the small number of users can be ensured without opening the roof fan, the energy consumption and the noise influence of the roof fan are considered, and the using effect of the users is considered at the same time.
The invention avoids the problems of long-term home-entry installation of the monitoring system, sensor failure, frequent fan frequency conversion, large system maintenance and management amount and the like.
The embodiments described above are intended to facilitate the understanding and appreciation of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art can make modifications and changes without departing from the scope of the present invention.
Claims (6)
1. A frequency conversion energy-saving method for a centralized flue is characterized by comprising the following steps:
step 1, monitoring and counting the simultaneous use coefficient of a flue;
step 2, acquiring the change relation of the simultaneous use coefficient along with time according to the monitoring statistical data;
step 3, acquiring a corresponding relation table of the simultaneous use coefficient variable quantity and the time node;
step 4, acquiring the corresponding relation between the fan frequency conversion and the time node; in step 4, inversely calculating the opening quantity and the exhaust quantity of the flue according to the simultaneous use coefficient, inversely calculating the operating frequency of the fan according to the exhaust quantity, and finally obtaining the corresponding relation between the fan frequency conversion and the time node;
step 5, when the system runs, according to the current time node, sending an instruction to the variable frequency fan according to the corresponding relation between the fan frequency conversion and the time node so as to guide the fan frequency conversion;
the concentrated flue is a concentrated flue of a house, and the fan is arranged on a roof;
the temperature self-metering instrument is arranged around the cooking bench, and the associated behavior characteristic that the range hood is opened when a resident opens the cooking bench is utilized; when the monitored temperature is higher than the indoor and outdoor temperatures, the cooking bench is considered to be opened at the moment, namely the range hood is opened; when the monitored temperature is reduced in a jumping manner, the cooking bench is considered to be closed at the moment;
converting the continuous smooth temperature profile into a 0-1 coded digital step signal, wherein "0" indicates no cooking action and the flue is not used; "1" indicates cooking is being performed and the flue is in use; the number of the residents using the flue at the same time can be known by summing the data signals of the residents in the flue at the same time, so that the simultaneous use coefficient of the flue is calculated;
the opening and closing of the flue are identified by the slope of the curve, when the slope is changed from negative number or 0 to positive number, the turning point marks the beginning of cooking behavior, and the coded signal has a step from 0 to 1; when the slope changes from positive or 0 to negative, the turning point marks the end of the cooking action and the encoded signal appears as a 1-0 step.
2. The variable-frequency energy-saving method for the concentrated flue according to claim 1, characterized in that:
in the step 1, an electric power self-meter, a temperature self-meter or an on-off sensing monitor is adopted for monitoring and counting.
3. The variable-frequency energy-saving method for the concentrated flue according to claim 1, characterized in that:
and 2, drawing a relation chart of the simultaneous utilization coefficient of the centralized flue system and time according to the monitoring statistical data, and acquiring the change relation of the simultaneous utilization coefficient along with the time.
4. The variable-frequency energy-saving method for the centralized flue according to claim 1, characterized in that:
and 3, processing and simultaneously using a coefficient-time relation chart, and performing grading and segmenting processing on the chart to obtain a corresponding relation table of the simultaneously used coefficient variable quantity and time nodes.
5. The variable-frequency energy-saving method for the concentrated flue according to claim 1, characterized in that:
calculating the fan frequency under the corresponding simultaneous use coefficient according to the following formula (1)
In the formula, G run For actual operation of air volume, G design For designing the air volume, f run For the actual operating frequency, f design To design the frequency; the actual operation air volume is calculated according to the following formula (2),
G run ＝g design ×N×ζ (2)
in the formula, g design The air quantity is designed for the single-layer range hood, N is the total number of floors, and zeta is the coefficient of simultaneous use.
6. The variable-frequency energy-saving method for the centralized flue according to claim 1, characterized in that: the fan is not started in the time period of non-three meals.
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| CN116557324B (en) * | 2023-04-29 | 2024-03-01 | 南京德力通环境科技有限公司 | Variable frequency control method for roof fan of concentrated flue of residential kitchen |
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