An energy-saving control method based on an internet-of-things central air conditioner

Abstract

The application discloses an energy-saving control method based on an Internet of Things central air conditioner, relates to the field of air conditioner energy saving, and aims to solve the problem of poor correlation between the opening state of an air conditioner and personnel conditions in the prior art.The technical scheme is as follows: after reaching the set leaving time, the access of the personnel permitted to enter each working area and the access of the company general entrance and exit are checked;if there is an employee with an entering record but no leaving record is detected, the employee information is checked, and all the working areas permitted to be entered by the employee are confirmed;the air conditioner in the area permitted to be entered is kept on, and the air conditioner in other areas is turned off;when the leaving information of the employee who has not left is detected, the central air conditioner in all the working areas permitted to be entered by the employee is turned off.Through the combination of the post information of the employee and the access control system, the overtime work of the employee can be known by detecting the access of the employee, and the air conditioner in the working area where the employee leaves and the working area where the employee will not go is turned off, so that the energy-saving effect is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air conditioning energy saving, in particular to an energy-saving control method of central air conditioner based on Internet of Things. BACKGROUND

[0002] In order to improve the comfort of employees during work, central air conditioners are often installed in company buildings to regulate temperature and humidity, but central air conditioners often consume a lot of energy, especially when some employees leave work and some employees work overtime, the central air conditioner cannot be completely turned off, but the total number of employees is reduced, and the central air conditioner is completely turned on, which will cause a lot of energy waste.

[0003] Chinese patent CN202210681099.0 discloses an energy-saving control method of central air conditioner based on Internet of Things, which adopts the technical scheme of obtaining the normal starting time t0 of the normal starting of the Internet of Things central air conditioner to the preset temperature; comparing with the pre-stored starting time t1, once t0>t1 is found, it means that the starting time is too long, so that the Internet of Things central air conditioner system at this time has equipment problems, and the background is sent for maintenance; if t0≤t1 is found, it means that the starting time is correct, and the current number of personnel R o is obtained by counting the in-out personnel situation of the building at this time, and compared with the pre-stored total number R1, once R o >half of R1, the Internet of Things central air conditioner system at this time is adjusted to work in the highest energy consumption value working condition; when R o ≤half of R1, the Internet of Things central air conditioner system at this time is adjusted to work in the lowest energy consumption value working condition.

[0004] Although this technical scheme can save energy, it is not fine enough in the correlation between the air conditioning opening state and the personnel situation. Specifically, during the overtime work of employees, some department employees often work at this time, if the central air conditioner power of the whole company is reduced, it will not only cause the air conditioner in the unoccupied office area to be still turned on and waste energy, but also cause the air conditioner total power to decrease due to the small number of remaining personnel in the company, which will cause the air conditioner power in the overtime work area to be not matched with the number of remaining personnel, and affect the comfort. SUMMARY

[0005] In view of the problems existing in the prior art, the present application discloses an energy-saving control method of central air conditioner based on Internet of Things, which adopts the technical scheme of comprising the following steps:

[0006] Step 1, identify the employee identity and the in-out situation of the working area through the identity recognition system, check the in-out situation of the permitted personnel in each working area and the in-out situation of the total entrance and exit of the company when reaching the set off-work time, and determine the remaining personnel situation of each working area;

[0007] Step 2, if all the entering personnel are no longer present after leaving the entering record, and the company general entrance has the leaving record after work, then the air conditioning system of the working area is closed until all the area central air conditioners are closed to achieve energy saving effect;

[0008] Step 3, if there are employees with entering records but no leaving records are detected, it is considered that the employees have not left, the information of the employees is checked to confirm all the permitted entering working areas; then the other areas are idle areas, and the air conditioning system can be closed;

[0009] Step 4, the air conditioning of the permitted entering area confirmed in step 3 is maintained to be opened, the air conditioning of the other areas is closed, the area where the employee can go is maintained to be opened, and the area where the employee will not go and the area where the employee will not probably go are closed to save energy consumption;

[0010] Step 5, when the leaving information of the employee who has not left is detected, the identity recognition system of the permitted entering working area and the company general entrance is monitored, when the identity recognition system of the company general entrance detects the passing signal of all the employees who have not left after work, it is confirmed that the employees have left work, and the central air conditioner of all the working areas where the employees are permitted to enter is closed.

[0011] As a preferred technical solution of the present application, in step 1, the way that the identity recognition system recognizes the identity of the employee is as follows:

[0012] Step a, a radio frequency identification (RFID) tag is arranged on the employee identity recognition card, and the tag is bound with the employee number or post code; so as to confirm the identity of the employee;

[0013] Step b, the area where the employee is permitted to move and the working area are set;

[0014] Step c, an RFID recognizer is installed on the access control system of each area, and the RFID recognizer is in communication connection with the server, after the RFID recognizer detects the RFID tag, the identity or post of the employee is confirmed through the tag, so as to obtain the permitted passing range in the subsequent process.

[0015] As a preferred technical solution of the present application, in step 1, the way that the employee entering and leaving the working area is confirmed is to check the number of times of entering and leaving, the odd number is the employee entering, and the even number is the employee leaving.

[0016] As a preferred technical solution of the present application, after the air conditioner is opened, the body surface temperature of the human body is detected regularly, the body surface temperature of the personnel in the working area is detected through the body surface temperature detection device, if the body surface temperature is high, the wind speed is increased, and if the body surface temperature is low, the wind speed is reduced, so that the body feeling of the employee is more comfortable.

[0017] As a preferred embodiment of the present invention, the working area is independently controlled by air conditioning according to its regional function, so as to facilitate precise control.

[0018] As a preferred technical solution of the present invention, the areas where employees will stay for a long time during overtime work are controlled according to steps 2-5, while the central air conditioning in areas where employees will not stay for a long time is turned off or adjusted to a lower power. During overtime work, the storage room, water room and other areas where employees will stay for a short time can reduce energy consumption by not turning on the air conditioning.

[0019] As a preferred technical solution of the present invention, the air conditioner performs a self-test when it is turned on, detects the indoor temperature, starts running according to the set power and temperature, and detects the change in indoor temperature under the action of the air conditioner within a set time to detect whether the equipment is operating normally.

[0020] As a preferred technical solution of the present invention, during self-testing, the door and window sensors detect the closure status of doors and windows in the work area, and self-testing is only performed on work areas where all doors and windows are closed, so as to improve the accuracy of self-testing.

[0021] The beneficial effects of this invention are as follows: By combining employee job information with the access control system, this invention can detect employees' overtime work by monitoring their entry and exit. It also combines the control of central air conditioning with employee attendance, obtaining the job information of employees working overtime by detecting their attendance, thereby identifying the areas they may be going to. This allows the air conditioning in vacant areas to be turned off without affecting employees' work, thus achieving energy-saving effects.

[0022] Furthermore, by further dividing the areas that employees might visit into functional zones and turning off the air conditioning in areas where employees only stay briefly, power consumption can be further reduced, thereby achieving energy-saving effects. Detailed Implementation

[0023] Example 1

[0024] This invention discloses an energy-saving control method for a central air conditioning system based on the Internet of Things (IoT). The technical solution includes the following steps:

[0025] Step 1: Set an RFID tag on the employee identification card and bind the tag to the employee's employee number.

[0026] Step 2: Set the employee's position and the areas and work areas that the employee is allowed to access.

[0027] Step 3: Install RFID readers on the access control system in each area to wirelessly identify RFID tags and thus know the entry and exit status of employees. In order to facilitate linkage with the air conditioning system, establish a communication connection between the RFID readers and the server connected to the air conditioning control system.

[0028] Step 4: When the air conditioner is turned on, it performs a self-test, detects the indoor temperature, starts running according to the set power and temperature, and detects the change in indoor temperature under the air conditioner's influence within a set time. The temperature change is compared with the set value to check whether the equipment is operating normally. To avoid the impact of people opening doors and windows, the self-test uses door and window sensors to detect whether the doors and windows in the work area are closed, and only the work area where all doors and windows are closed is self-tested. To further save resources, the air conditioner is turned on in the work area where the doors and windows are normally closed, using door and window sensors.

[0029] Step 5: After the air conditioner is turned on, periodically check the body surface temperature. Use a body surface temperature detection device to check the body surface temperature of people in the work area. If the body surface temperature is too high, increase the fan speed; if the body surface temperature is too low, decrease the fan speed. This is to improve employee comfort.

[0030] Step 6: After the set end time, the server uses an RFID reader to identify the employee's passage. It compares the employee's daily passage count to determine their actions. Specifically, an odd number of passages is considered entry, and an even number is considered departure. The system also compares the data with images captured by cameras equipped with human body recognition in the office area to verify the detection results. Specifically, the server periodically takes photos of the work area with cameras, counts the people captured, and compares the count with the number determined by the RFID reader. If the counts match, the identification is accurate; if they do not match, the system takes photos and compares again after 5 minutes. This process is repeated. If, after 5 cycles, there are 3 or more discrepancies with equal differences, the management is notified for verification.

[0031] Step 7: If the number of times all personnel pass through the work area and the company's main entrance / exit is even, check the work area for any personnel activity through the monitoring system. If not, turn off the air conditioning system in that work area until all central air conditioning systems in all areas have been turned off.

[0032] Step 8: If there are employees who have not left, verify their information and confirm all work areas they are permitted to enter.

[0033] Step 9: Functionally divide the work areas that are permitted to be entered in Step 8. Keep the air conditioning on in areas where people may stay for a long time, such as office areas, and turn off the air conditioning in areas where people stay for a short time, such as tea rooms and storage rooms, in order to reduce energy consumption.

[0034] Step 10: Perform probability statistics on the areas where the employee may stay for an extended period of time, as mentioned in Step 9. Review the employee's past travel records and assess the probability of going to each area. Turn off the air conditioning system in areas with a probability of less than 30%.

[0035] Step 11: If the employee who has not yet left their position is in a special post, such as a maintenance post or management position, then check the equipment repair record, work arrangement record, and other information. If there is an equipment repair record, then keep the air conditioning on in the work area where the equipment is located. Similarly, if the work arrangement record indicates a work area that needs to be visited, then keep the air conditioning on in that work area to avoid affecting the normal operation of the work.

[0036] Step 12: When the departure information of an employee who has not left is detected, monitor the work area they are allowed to enter and the identification system at the company's main entrance and exit. When the identification system at the company's main entrance and exit detects the passage signal of all employees in a work area, turn off the central air conditioning in that work area until all air conditioning is turned off.

[0037] While the specific embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention, and modifications or variations without creative effort are still within the protection scope of the present invention.

Claims

1. An energy-saving control method for a central air conditioning system based on the Internet of Things, characterized in that, Includes the following steps: Step 1: Identify employees and their entry and exit from work areas through the identity recognition system. After the set end time, verify the entry and exit of personnel allowed to enter each work area and the entry and exit of the company's main entrance and exit. Step 2: If all personnel who entered no longer have an entry record after leaving, and there is a departure record for them at the company's main entrance after get off work, then shut down the air conditioning system of that work area until the central air conditioning in all areas has been shut down. Step 3: If there is an employee with an entry record but no exit record has been detected, verify the employee's information and confirm all work areas that the employee is authorized to enter. Step 4: Keep the air conditioning on in the areas where access is permitted as confirmed in Step 3, and turn off the air conditioning in other areas; Step 5: When the departure information of an employee who has not left is detected, monitor the identification system of the work area he / she is allowed to enter and the company's main entrance and exit. When the identification system of the company's main entrance and exit detects the passage signal of all employees who have not left after get off work, turn off the central air conditioning of all work areas he / she is allowed to enter.

2. The energy-saving control method for a central air conditioning system based on the Internet of Things according to claim 1, characterized in that, In step 1, the identity recognition system identifies employees in the following ways: Step a: Set an RFID tag on the employee identification card and bind the tag to the employee's employee number or job code; Step b: Define the areas and work areas where the employee is permitted to move around; Step c: Install RFID readers on the access control systems in each area and establish a communication connection between the RFID readers and the server.

3. The energy-saving control method for a central air conditioning system based on the Internet of Things according to claim 2, characterized in that: In step 1, the method for confirming an employee's entry and exit from the company and work area is to check the number of times they enter and exit. Odd numbers indicate that the employee has entered, and even numbers indicate that the employee has left.

4. The energy-saving control method for a central air conditioning system based on the Internet of Things according to claim 1, characterized in that: After the air conditioner is turned on, the body surface temperature is checked regularly. The body surface temperature detection device detects the body surface temperature of people in the work area. If the body surface temperature is too high, the fan speed is increased; if the body surface temperature is too low, the fan speed is decreased.

5. The energy-saving control method for a central air conditioning system based on the Internet of Things according to claim 1, characterized in that: The work areas are individually air-conditioned according to their functional zones.

6. The energy-saving control method for a central air conditioning system based on the Internet of Things according to claim 5, characterized in that: For areas where employees will stay for extended periods during overtime, follow steps 2-5 for control. For areas where employees will not stay for extended periods, turn off the central air conditioning or adjust it to a lower power.

7. The energy-saving control method for a central air conditioning system based on the Internet of Things according to claim 1, characterized in that: When the air conditioner is turned on, it performs a self-test, detects the indoor temperature, starts operating according to the set power and temperature, and detects the change in indoor temperature under the action of the air conditioner within a set time to check whether the equipment is operating normally.

8. The energy-saving control method for a central air conditioning system based on the Internet of Things according to claim 7, characterized in that: During self-inspection, the door and window sensors detect whether the doors and windows in the work area are closed, and self-inspection is only performed on work areas where all doors and windows are closed.