A control method of a new fan

Abstract

The application discloses a kind of control methods of fresh air machine, step S1: obtaining outdoor air hourly temperature t wi And outdoor air hourly humidity d wi ;Step S2: obtaining indoor air hourly temperature t ni And indoor air hourly humidity d ni ;Step S3: calculating outdoor air hourly enthalpy h wi And indoor air hourly enthalpy h ni ;Step S4: according to the numerical size relation of outdoor air hourly enthalpy h wi And indoor air hourly enthalpy h ni , control fresh air size of fresh air machine.The application compares the heat and humidity parameters of outdoor fresh air and indoor air by time, and controls the operation of fresh air machine accordingly, to maximize the use of outdoor fresh air free cooling under the premise of ensuring indoor comfort, reduce the energy consumption of unit.

Description

Technical Field

[0001] This invention belongs to the field of fresh air unit control technology, and particularly relates to a control method for a fresh air unit.

[0002] To promote green energy conservation, fresh air cooling technology has been widely used. It can utilize outdoor air for free cooling, creating a comfortable and healthy indoor environment by completely or partially replacing artificial cooling sources.

[0003] However, the operation of fresh air in existing air conditioning units is based on unilateral control conditions on either the indoor or outdoor side, without considering the hourly and effective comparison of the enthalpy parameters of outdoor fresh air and indoor conditions to coordinate the operation of the fresh air unit. For example, patent number CN111322739B discloses a window-type three-constant system based on internet meteorological data. Although it collects six air quality indicators from a meteorological data platform, it only uses them to determine the setting of the fresh air unit filter. It does not provide a solution for situations where there is no internet platform access, nor does it differentiate between different functional areas, and it cannot fully utilize outdoor fresh air for free cooling.

[0004] Therefore, how to differentiate between different functional areas and make full use of outdoor fresh air for free cooling is an urgent problem to be solved. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a control method for a fresh air unit, which compares the heat and humidity parameters of outdoor fresh air and indoor air hourly, and controls the operation of the fresh air unit accordingly, so as to maximize the use of outdoor fresh air for free cooling while ensuring indoor comfort and reducing unit energy consumption.

[0006] To achieve the above objectives, the present invention provides a control method for a fresh air unit, comprising the following steps:

[0007] Step S1: Obtain the hourly outdoor air temperature t wi outdoor air humidity d wi ;

[0008] Step S2: Obtain indoor air parameters, including hourly indoor air temperature t. ni Indoor air humidity d ni ;

[0009] Step S3: Calculate the hourly enthalpy h of outdoor air according to formula (1). wi Hourly enthalpy of indoor air h ni ;

[0010] h = (1.01 + 1.84d) t + 2490d (1);

[0011] In the formula: h is hwi or h ni Correspondingly, d is d wi or d ni t is t wi or t ni ;

[0012] Step S4: Based on the hourly enthalpy value h of outdoor air wi Hourly enthalpy of indoor air h ni The numerical relationship between these values ​​controls the amount of fresh air in the fresh air system.

[0013] Preferably, step S4 specifically comprises:

[0014] When the enthalpy value of outdoor air per hour h wi Greater than or equal to the hourly enthalpy of indoor air h ni At that time, the fresh air volume of the fresh air unit is controlled at the minimum fresh air volume value;

[0015] When the enthalpy value of outdoor air per hour h wi Given the hourly enthalpy value h of indoor air ni Hourly enthalpy of indoor air h ni When the air volume is between 75% and 85%, the fresh air volume of the fresh air unit should be controlled at the middle value.

[0016] When the enthalpy value of outdoor air per hour h wi Less than the hourly enthalpy of indoor air h ni When the air volume is 75% of the maximum, the fresh air volume of the fresh air unit should be controlled at the maximum fresh air volume value.

[0017] Preferably, step S2 specifically includes:

[0018] Real-time indoor air quality data is acquired from an indoor sensor array, including real-time indoor air temperature and humidity. The hourly indoor air temperature t is obtained by performing an arithmetic average on the real-time indoor air quality data for each hour. ni Indoor air humidity d ni .

[0019] Preferably, step S2 specifically involves: obtaining the location parameters and obtaining the indoor air parameters according to a preset location parameter-indoor air parameter relationship table.

[0020] Preferably, the indoor air parameters also include the indoor carbon dioxide concentration value, which is obtained by means of an indoor sensor group. When the indoor carbon dioxide concentration value is greater than 1000ppm, step S4 is replaced by: controlling the fresh air volume of the fresh air unit to the maximum fresh air volume value.

[0021] Preferably, step S1 specifically includes: determining whether the fresh air unit is connected to the Internet; if connected to the Internet, obtaining the hourly outdoor air temperature t through the China Meteorological Data Network. wi outdoor air humidity d wi .

[0022] Preferably, step S1 specifically includes:

[0023] Real-time outdoor air condition data is acquired from an outdoor sensor array, including real-time outdoor air temperature and real-time outdoor air humidity; the first hourly temperature t is obtained by performing an arithmetic average of the real-time outdoor air condition data for each hour. wi1 and the first hourly humidity d wi1 ;

[0024] Acquire pre-loaded ground weather station observation data, which includes the second hourly temperature and second hourly humidity from the most recent weather stations over the past few years. Calculate the arithmetic mean of the second hourly temperature and second hourly humidity to obtain the representative temperature value t. wi2 and humidity representative value d wi2 ;

[0025] The first hourly temperature t wi1 and temperature representative value t wi2 The average hourly outdoor air temperature t is obtained. wi The first hourly humidity d wi1 and humidity representative value d wi2 The average outdoor air humidity d is obtained by taking the average value. wi .

[0026] Preferably, before step S2, the method further includes: obtaining operating mode parameters;

[0027] When the operating mode parameter is pre-cooling mode and the current time is the preset pre-cooling time, step S4 is replaced by: controlling the fresh air volume of the fresh air unit to the maximum fresh air volume value.

[0028] Preferably, before step S2, the method further includes: obtaining operating mode parameters;

[0029] When the operating mode parameter is preheating mode and the current time is the preset preheating time, step S4 is replaced by: controlling the fresh air volume of the fresh air unit to the minimum fresh air volume value.

[0030] The beneficial effect of this invention is that by accessing real-time observation data from the China Meteorological Data Network, or by using pre-loaded observation data from ground meteorological stations over the past few years as a benchmark reference value, the heat and humidity parameters of outdoor fresh air and indoor air are selected and compared hourly, and the operation of the fresh air unit is controlled accordingly. Under the premise of ensuring indoor comfort, the free use of outdoor fresh air for cooling is prioritized to the maximum extent, thereby reducing the unit's energy consumption. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 and Figure 2 This is a schematic diagram of the control method for the fresh air unit disclosed in this invention. Detailed Implementation

[0033] The core of this invention lies in providing a control method for a fresh air unit, which compares the heat and humidity parameters of outdoor fresh air and indoor air hourly, and controls the operation of the fresh air unit accordingly. Under the premise of ensuring indoor comfort, it maximizes the use of outdoor fresh air for free cooling and reduces the unit's energy consumption.

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Figure 1 The control method for the fresh air unit disclosed in this embodiment is shown, including the following steps:

[0036] Step S1: Obtain the hourly outdoor air temperature t wi outdoor air humidity d wi ;

[0037] Step S2: Obtain indoor air parameters, including hourly indoor air temperature t. ni Indoor air humidity d ni ;

[0038] Step S3: Calculate the hourly enthalpy h of outdoor air according to formula (1). wi Hourly enthalpy of indoor air h ni ;

[0039] h = (1.01 + 1.84d) t + 2490d (1);

[0040] In the formula: h is h wi or h ni Correspondingly, d is d wi or d ni t is t wi or t ni ;

[0041] Step S4: Based on the hourly enthalpy value h of outdoor air wi Hourly enthalpy of indoor air h ni The numerical relationship between these values ​​controls the amount of fresh air in the fresh air system.

[0042] Specifically, step S1 includes: determining whether the fresh air system is connected to the Internet;

[0043] 1) If connected to the internet, the hourly outdoor air temperature t will be obtained through the China Meteorological Data Network. wi outdoor air humidity d wi Specifically, hourly atmospheric environmental temperature and humidity data from designated stations can be obtained in real time through the API service provided by the China Meteorological Data Network, and used as data for t. wi and d wi 。;

[0044] 2) If there is no internet access, real-time outdoor air condition data is obtained from the outdoor sensor array, including real-time outdoor air temperature and humidity; the first hourly temperature t is obtained by arithmetically averaging the real-time outdoor air condition data for each hour. wi1 and the first hourly humidity d wi1 ;

[0045] Acquire pre-loaded ground weather station observation data, including the second hourly temperature and second hourly humidity data from the most recent weather stations over the past few years. Calculate the arithmetic mean of the second hourly temperature and second hourly humidity to obtain the representative temperature value t. wi2 and humidity representative value d wi2 ;

[0046] The first hourly temperature t wi1 and temperature representative value t wi2 The average hourly outdoor air temperature t is obtained. wi The first hourly humidity d wi1 and humidity representative value d wi2 The average outdoor air humidity d is obtained by taking the average value. wi .

[0047] In certain specific situations, considering the complexity of factors affecting the accuracy of outdoor sensor data, the weather station closest to the usage location is selected from the system's built-in database. 8760 hourly temperature and relative humidity values ​​for each of the past three years from that weather station are downloaded, and an arithmetic average is taken to obtain 8760 representative hourly temperature values ​​(t) for the entire year. wi2 and relative humidity representative value d wi2 . t wi1 value and t wi2 The outdoor hourly temperature value t is obtained by averaging the values. wi , will d wi1 value and d wi2 The outdoor hourly humidity value d is obtained by averaging the values. wi ,

[0048] In actual use, step S2 can be divided into two cases: case 1 is to track indoor data in real time, and case 2 is to obtain indoor data in a specific business location by using a preset location parameter-indoor air parameter relationship table without real-time tracking.

[0049] Case 1: such as Figure 1 As shown, real-time indoor air quality data is acquired from an indoor sensor array, including real-time indoor air temperature and humidity. The hourly indoor air temperature t is obtained by arithmetic averaging the real-time indoor air quality data for each hour. ni Indoor air humidity d ni ;

[0050] Scenario 2: Obtain venue parameters. Indoor air parameters are obtained based on a pre-defined venue parameter-indoor air parameter relationship table. To maximize the use of free fresh air for cooling, it is necessary to first set reasonable cooling, heating, and transition seasons. Taking a hot-summer, cold-winter region as an example, the cooling season is set from June 1st to October 31st, a total of 5 months; the heating season is set from December 1st to March 31st, a total of 4 months; the transition season (non-heating season) is set from November 1st to November 30th and from April 1st to May 31st, a total of 3 months. For specific venues with different comfort requirements, the indoor temperature, relative humidity, and corresponding calculated enthalpy values ​​of shopping malls, supermarkets, event venues, office buildings, and production workshops are statistically analyzed to obtain the venue parameter-indoor air parameter relationship table.

[0051] Location Parameters - Indoor Air Parameter Relationship Table

[0052]

[0053] The data in the table above, while ensuring indoor comfort, provides reasonable heating and cooling periods for hot summer and cold winter zones and transitional seasons based on their respective characteristics. It sets appropriate indoor air temperature and humidity parameter values ​​and compares them hourly with outdoor fresh air parameters. This is the key to shortening the heating season and prioritizing free fresh air cooling.

[0054] Step S4 specifically involves: when the hourly enthalpy value h of the outdoor air... wi Greater than or equal to the hourly enthalpy of indoor air h ni At that time, the fresh air volume of the fresh air unit is controlled at the minimum fresh air volume value;

[0055] When the enthalpy value of outdoor air per hour h wi Given the hourly enthalpy value h of indoor air ni Hourly enthalpy of indoor air h ni When the air volume is between 75% and 85%, the fresh air volume of the fresh air unit should be controlled at the middle value.

[0056] When the enthalpy value of outdoor air per hour h wi Less than the hourly enthalpy of indoor air h ni When the air volume reaches 75%, the cooling potential of the fresh air is large, and the fresh air valve is controlled to open to the maximum and the fresh air volume of the fresh air fan is set to the maximum fresh air volume value.

[0057] In a preferred embodiment, such as Figure 2 As shown, before step S2, the method further includes: acquiring operating mode parameters, including automatic mode, pre-cooling mode, and pre-heating mode, one of which can be selected for operation during actual use; when the operating mode parameter is pre-cooling mode and the current time is the preset pre-cooling time, step S4 is replaced by: controlling the fresh air volume of the fresh air unit to the maximum fresh air volume value. Pre-cooling mode refers to turning on the fresh air unit in advance and operating it at the maximum fresh air volume before the unit starts cooling operation in summer, taking into account the low outdoor fresh air enthalpy value and the large free cooling potential of the fresh air; when the business hours begin, the normal coupling control mode is turned on; specifically, pre-heating mode is for places that still have a cooling load in winter, turning on the winter air conditioning unit to start heating operation in advance before the business hours to increase the indoor temperature; when the business hours begin, the normal coupling control mode is turned on; automatic mode is to operate automatically according to the fresh air unit control method disclosed in this embodiment.

[0058] In a preferred embodiment, the indoor air parameters obtained in step S2 also include the indoor carbon dioxide concentration value. The indoor carbon dioxide concentration value is obtained by an indoor sensor group. When the indoor carbon dioxide concentration value is greater than 1000ppm, step S4 is replaced by controlling the fresh air volume of the fresh air unit to the maximum fresh air volume value, so as to prioritize the indoor air quality.

[0059] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0060] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method for a fresh air unit, characterized in that, Includes the following steps: Step S1: Obtain the hourly outdoor air temperature t wi outdoor air humidity d wi ; Step S2: Obtain indoor air parameters, including hourly indoor air temperature t. ni Indoor air humidity d ni ; Step S3: Calculate the hourly enthalpy h of outdoor air according to formula (1). wi Hourly enthalpy of indoor air h ni ; h = (1.01+1.84d)t + 2490d (1); In the formula: h is h wi or h ni Correspondingly, d is d wi or d ni t is t wi or t ni ; Step S4: Control the fresh air volume of the fresh air unit based on the relationship between the hourly enthalpy values ​​of outdoor air (hwi) and indoor air (hni). Step S1 specifically includes: The system determines whether the fresh air unit is connected to the internet. If not, it acquires real-time outdoor air quality data from the outdoor sensor array, including real-time outdoor temperature and humidity. The first hourly temperature t is obtained by arithmetically averaging the real-time outdoor air quality data for each hour. wi1 and the first hourly humidity d wi1 ; Obtain pre-loaded ground weather station observation data, which includes the second hourly temperature and second hourly humidity of the weather station closest to the location of use for the past few years. Perform an arithmetic average of the second hourly temperature and second hourly humidity to obtain 8760 representative temperature values ​​(t) for the entire year. wi2 and humidity representative value d wi2 The first hourly temperature t wi1 and temperature representative value t wi2 The average hourly outdoor air temperature t is obtained. wi The first hourly humidity d wi1 and humidity representative value d wi2 The average outdoor air humidity d is obtained by taking the average value. wi .

2. The control method according to claim 1, characterized in that, Step S4 specifically involves: When the enthalpy value of outdoor air per hour h wi Greater than or equal to the hourly enthalpy of indoor air h ni At that time, the fresh air volume of the fresh air unit is controlled at the minimum fresh air volume value; When the enthalpy value of outdoor air per hour h wi Given the hourly enthalpy value h of indoor air ni Hourly enthalpy of indoor air h ni When the air volume is between 75% and 85%, the fresh air volume of the fresh air unit should be controlled at the middle value. When the enthalpy value of outdoor air per hour h wi Less than the hourly enthalpy of indoor air h ni When the air volume is 75% of the maximum, the fresh air volume of the fresh air unit should be controlled at the maximum fresh air volume value.

3. The control method according to claim 1, characterized in that, Step S2 is as follows: Real-time indoor air quality data is acquired from an indoor sensor array, including real-time indoor air temperature and humidity. The hourly indoor air temperature t is obtained by performing an arithmetic average on the real-time indoor air quality data for each hour. ni Indoor air humidity d ni .

4. The control method according to claim 1, characterized in that, The indoor air parameters also include the indoor carbon dioxide concentration value, which is obtained by an indoor sensor group. When the indoor carbon dioxide concentration value is greater than 1000 ppm, step S4 is replaced by: controlling the fresh air volume of the fresh air unit to the maximum fresh air volume value.

5. The control method according to claim 1, characterized in that, Step S1 specifically includes: determining whether the fresh air unit is connected to the Internet; if connected to the Internet, obtaining the hourly outdoor air temperature t through the China Meteorological Data Network. wi outdoor air humidity d wi .

6. The control method according to claim 1, characterized in that, The process before step S2 also includes: obtaining operating mode parameters; When the operating mode parameter is pre-cooling mode and the current time is the preset pre-cooling time, step S4 is replaced by: controlling the fresh air volume of the fresh air unit to the maximum fresh air volume value.

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