A method for adjusting air volume of a variable air volume air conditioning system

Abstract

The application relates to the technical field of air conditioners, and particularly relates to a variable air volume air conditioning system air volume adjusting method. The variable air volume air conditioning system air volume adjusting method sequentially adjusts each air distributor on each branch main pipe, so that the ratio of the actual air volume of the air outlet at the position of each air distributor on the branch main pipe to the rated air volume of the air outlet and the ratio of the branch main pipe satisfy a rated difference value, the air volume of each air outlet under the same branch main pipe can be uniformly ensured, and the air volume of the branch main pipe is matched; after the adjustment of all the air distributors is completed, the adjustment of the air valve is carried out, so that the ratio of the actual air volume of each branch main pipe to the rated air volume of the branch main pipe and the ratio of the central air conditioner satisfy a rated difference value. Further, the problem that the adjustment cycle is long and the efficiency is low due to the fact that the air volume of the branch main pipe is adjusted first and then the air volume of the air outlet is adjusted, and the branch main pipe needs to be adjusted again when the air volume adjustment of the air outlet is completed is solved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a method for adjusting the air volume of a variable air volume (VAV) air conditioning system. Background Technology

[0002] The installation of air conditioning systems is involved in shipbuilding. Typically, these systems are centrally located, where the main air conditioning unit centrally cools or heats the air, then distributes the cool or warm air through ducts to the air outlets in each compartment, while simultaneously controlling the temperature in each compartment. For example... Figure 1 The diagram shows a schematic of an existing air conditioning system. This system includes a central air conditioner 1, and ductwork connecting the central air conditioner 1 to air outlets and individual compartments. The ductwork includes a main duct 2 and branch ducts 21 connected to the main duct 2. Each branch duct 21 is further divided into branch ducts 22. Air outlets are located at the ends of each branch duct 22 and correspond one-to-one with the branch ducts; that is, the airflow from each outlet is equal to the airflow supplied by each branch duct 22. To regulate the airflow from each outlet, the system also includes dampers 5 located on the branch ducts and air distributors 6 installed on the branch ducts (i.e., at the air outlets). Adjusting the opening of the dampers 5 and air distributors 6 regulates the airflow from each outlet, ultimately achieving uniform airflow from all outlets. For safety, fire dampers 3 are also installed on the ductwork to prevent flames from spreading through the ductwork in the event of a fire.

[0003] During airflow adjustment, since all air is exhausted from the central air conditioner, the airflow resistance increases with the length and bends of the duct. This means different air outlets face varying airflow resistance. If all outlet valves and distributors have the same opening, outlets closer to the central air conditioner or with fewer bends will receive more airflow, while outlets farther from the central air conditioner or with more bends will receive less, resulting in uneven airflow across different compartments. Therefore, it is necessary to maintain different openings for each valve and branch duct.

[0004] The existing adjustment process involves turning on the central air conditioner and fully opening the air dampers and distributors. Adjustments are made based on the different flow rates on each branch pipe, reducing the flow rate of branches with higher flow rates to balance the airflow across all branches. Then, the distributors are adjusted to balance the airflow at each outlet. However, in this solution, the airflow resistance at each outlet changes with the adjustment of the distributors. This means that even if the airflow is balanced across the branch pipes by adjusting the dampers, the airflow will become uneven again as the distributors are adjusted. This necessitates further fine-tuning of the dampers after adjusting the distributors, resulting in a long adjustment cycle and low efficiency. Summary of the Invention

[0005] In view of this, the present invention provides a method for adjusting the air volume of a variable air volume (VAV) air conditioning system, which solves the problem in the prior art that adjusting the air volume of the branch main pipe first and then the air volume of the outlet causes the branch main pipe to be affected and needs to be adjusted again when the air volume of the outlet is adjusted, resulting in a long adjustment cycle and low efficiency.

[0006] A method for adjusting the air volume of a variable air volume (VAV) air conditioning system involves turning on the air conditioning system and ensuring that all air valves and air distributors on each branch duct are at the same opening degree. First, each air distributor on each branch duct is adjusted sequentially so that the difference between the ratio of the actual airflow to the rated airflow of the outlet at each air distributor location on that branch duct and the ratio of the actual airflow to the rated airflow of that branch duct is within the rated difference range. After all air distributors in the air conditioning system have been adjusted, each air valve on each branch duct is adjusted so that the difference between the ratio of the actual airflow to the rated airflow of each branch duct and the ratio of the actual airflow to the rated airflow of the central air conditioning unit is within the rated difference range.

[0007] Furthermore, before adjusting each air distributor on each branch main pipe in sequence, first calculate the ratio of the actual air volume of each branch main pipe to the rated air volume of that branch main pipe, and then adjust the opening of each air distributor on each branch main pipe in sequence according to the ratio of the actual air volume of the branch main pipe to the rated air volume of that branch main pipe from small to large.

[0008] Furthermore, when adjusting the opening of the air distributors on each branch main pipe in sequence, the corresponding air distributors are adjusted in descending order of the ratio of the actual air volume of the air outlet to the rated air volume of the air outlet under that branch main pipe.

[0009] Furthermore, when adjusting the air distributor, reduce the opening of the air distributor until the ratio of the actual air volume to the rated air volume of the corresponding air outlet of the air distributor and the ratio of the actual air volume to the rated air volume of the branch pipe meet the rated difference.

[0010] Furthermore, by installing air volume sensors on the branch main pipes, the ratio of the actual air volume to the rated air volume of the branch main pipes can be detected in real time.

[0011] Furthermore, after adjusting the air valve, adjust the power of the central air conditioner so that the actual air volume of the central air conditioner is equal to the rated air volume. Detect the air volume of each air outlet. If the ratio of the air volume of an air outlet to the rated air volume of that air outlet is less than 90%, then adjust again.

[0012] Furthermore, if the ratio of the air volume of the air outlet to the rated air volume of the air outlet is less than 90%, the air distributor corresponding to the air outlet shall be adjusted.

[0013] Furthermore, the nominal difference satisfies that the difference between the two ratios is less than 10%.

[0014] Furthermore, when the central air conditioner is in cooling mode, the target temperature is set to meet a specific difference from the actual temperature.

[0015] Furthermore, the statement that the air valve and the air distributor are at the same opening degree means that both the air valve and the air distributor are in the fully open state.

[0016] The beneficial effects of the variable air volume (VAV) air conditioning system air volume adjustment method in this invention are as follows: In this invention, the air volume adjustment is conveniently achieved by turning on the air conditioning system, and since air is continuously supplied, the adjustment is easily and intuitively displayed. By sequentially adjusting each air distributor on each branch duct, and ensuring that the ratio of the actual airflow to the rated airflow of each air distributor's outlet on that branch duct meets the rated difference with the ratio of the actual airflow to the rated airflow of that branch duct, uniform airflow from each outlet under the same branch duct can be guaranteed, and the airflow can be matched with the airflow of the branch duct. Since the airflow of each branch duct is not the same, the most... Then, the branch main pipes are adjusted to match the air volume of the branch main pipes evenly. Since the air outlets are adjusted by the air distributor and their air capacity matches the branch main pipes, once the air volume of the branch main pipes is balanced, the air volume of each air outlet will naturally match the branch main pipes and keep the total volume balanced. In other words, the adjustment process reduces the number of repeated adjustments, shortens the adjustment cycle, and improves the adjustment efficiency. This solves the problem in the existing technology where the air volume of the branch main pipes is adjusted first and then the air volume of the air outlets is adjusted, which causes the branch main pipes to be affected when the air volume of the air outlets is adjusted, requiring readjustment and resulting in a long adjustment cycle and low efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments 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.

[0018] Figure 1 This is a schematic diagram of the structure of a ship's air conditioning system in the existing technology.

[0019] The labels in the diagram represent the following: 1. Central air conditioner; 2. Main duct; 21. Branch duct; 22. Branch duct; 3. Fire damper; 4. Flow sensor; 5. Air valve; 6. Air distributor. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0021] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0022] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be construed as indicating or implying relative importance. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0023] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0025] In the following description, suffixes such as "module," "part," or "unit" used to denote elements are used only for the convenience of the description of the invention and have no specific meaning in themselves. Therefore, "module" and "part" can be used interchangeably.

[0026] In Embodiment 1 of the variable air volume air conditioning system air volume adjustment method (hereinafter referred to as the air volume adjustment method) of the present invention:

[0027] This embodiment refers to Figure 1 The following is a schematic diagram of the air conditioning system structure. First, the air conditioning system needs to be turned on, ensuring all air valves 5 and air distributors 6 are at the same opening degree. Theoretically, if the airflow resistance of each part is the same, the airflow from each outlet will remain balanced. However, due to the influence of duct length, bends, and the number of bends, the airflow from each outlet is not balanced after the central air conditioner 1 is turned on, requiring adjustment. Maintaining the air conditioning system in operation can be achieved by real-time monitoring of the airflow from the outlets, making the adjustment process more realistic and intuitive. It is worth noting that at this time, air valves 5 and air distributors 6 are at the same opening degree and both are fully open, facilitating adjustment. Of course, in other implementations, air valves 5 and air distributors 6 can also be kept at 80% opening or other opening degrees.

[0028] The ultimate goal of airflow adjustment is to ensure uniform airflow from each air outlet. To achieve this uniformity, in this embodiment, each air outlet on the same branch pipe 21 is treated as a group of outlets for adjustment. First, the air outlets on each branch pipe 21 are adjusted to have the same airflow capacity. Then, different branch pipes 21 are adjusted to ensure balanced airflow from each branch pipe 21. Since the air outlets are adjusted to match the airflow capacity of the branch pipe 21, when the airflow of the branch pipe 21 is increased or decreased, the air outlets will also be increased or decreased accordingly, resulting in a balanced airflow after adjustment.

[0029] Specifically, before making adjustments, the ratio of the actual air volume of each branch main duct 21 to its rated air volume is first calculated. The air outlets of each branch main duct 21 are then adjusted sequentially according to the ratio of the actual air volume to the rated air volume, from smallest to largest. When adjusting the air outlets under the same branch main duct 21, the corresponding air distributors 6 are adjusted in descending order of the ratio of the actual air volume to the rated air volume of each outlet. This method determines the adjustment order, thus improving efficiency during the adjustment process. In this embodiment, the actual air volume in the branch main duct 21 is measured using a pre-installed air volume sensor within the branch main duct 21. The air volume sensor can be used not only during adjustment but also for real-time monitoring after adjustment. Of course, in other embodiments, the adjustment order can also be adjusted for different branch main ducts 21, such as from near to far or from far to near. Alternatively, in other embodiments, the air outlets under the same branch duct 21 can be adjusted in a different order. Alternatively, in other embodiments, the actual air volume can be adjusted by measuring the air volume at the air outlet and summing the air volumes of all air outlets under the same branch duct 21 to obtain the air volume of the branch duct 21. In this embodiment, the adjustment order of different air outlets under the same branch duct 21 mainly considers that when the air outlet with the smallest air volume is increased, the only way to increase it is to decrease the air distributors 6 corresponding to the other air outlets under the same branch duct 21, thereby "squeezing" the air volume of other parts to the air outlet with the smaller air volume.

[0030] During the adjustment process, when adjusting the air distributor 6, since its opening has already been adjusted to 100%, it can only be reduced. This reduction requires adjusting the opening of the air distributor 6 until the ratio of the actual and rated airflow of the corresponding outlet to the actual and rated airflow of the branch duct 21 meets the rated difference. Because the airflow of the branch duct 21 may fluctuate slightly during adjustment, it does not need to be perfectly consistent; it only needs to be within a suitable range, such as 3%, 5%, or other values ​​less than 10%.

[0031] After the air distributor 6 is adjusted, the air output capacity of each air outlet under the same branch pipe 21 is consistent. Then, the air supply volume of each branch pipe 21 is adjusted. Specifically, the air valve 5 on the branch pipe 21 needs to be adjusted to reduce the air valve 5 so that the air output volume of each branch pipe 21 is uniform. It is worth noting that uniform air output volume does not mean that the air output volume of each branch pipe 21 is the same, but that the ratio of the actual air output volume of each air outlet on the branch pipe 21 to the rated air output volume of the air outlet meets the rated difference with the ratio of the actual air supply volume of the branch pipe 21 to the rated air supply volume of the branch pipe 21. This is because the number of air outlets connected to each branch pipe 21 may not be consistent.

[0032] After adjustment, testing is required. Specifically, after adjustment, the power of the central air conditioner 1 is adjusted so that the actual air volume of the central air conditioner 1 equals the rated air volume. The air volume of each air outlet is measured. If the ratio of the air volume of an air outlet to its rated air volume is less than 90%, adjustment is performed again. For air outlets where the ratio of the air volume to its rated air volume is less than 90%, the corresponding air distributor 6 is adjusted. Of course, in other embodiments, other air distributors 6 can also be adjusted to indirectly adjust the air volume of the air outlet.

[0033] The main purpose of an air conditioning system is to heat or cool. In this embodiment, the air conditioner is mainly used for cooling. When the air conditioner is in cooling mode, the target temperature is set to a specific difference from the actual temperature. Specifically, the specific difference is 10 degrees Celsius. Of course, in other embodiments, the difference can also be set to other temperature differences such as 5 degrees Celsius or 8 degrees Celsius.

[0034] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A method for adjusting the air volume of a variable air volume (VAV) air conditioning system, characterized in that: Turn on the air conditioning system and ensure that all air valves on each branch pipe are at the same opening degree and all air distributors are at the same opening degree. First, adjust each air distributor on each branch main pipe in sequence so that the difference between the ratio of the actual air volume of the air outlet at the location of each air distributor on the branch main pipe to the rated air volume of the air outlet and the ratio of the actual air volume of the branch main pipe to the rated air volume of the branch main pipe is within the rated difference range. After all the air distributors in the air conditioning system have been adjusted, adjust the air valves on each branch pipe so that the difference between the ratio of the actual air volume of each branch pipe to the rated air volume of that branch pipe and the ratio of the actual air volume of the central air conditioner to the rated air volume of the central air conditioner is within the rated difference range.

2. The method for adjusting the air volume of a variable air volume air conditioning system according to claim 1, characterized in that: Before adjusting each air distributor on each branch main pipe in turn, first calculate the ratio of the actual air volume of each branch main pipe to the rated air volume of that branch main pipe, and then adjust the opening of each air distributor on each branch main pipe in order from small to large according to the ratio of the actual air volume of the branch main pipe to the rated air volume of that branch main pipe.

3. The method for adjusting the air volume of a variable air volume air conditioning system according to claim 2, characterized in that: When adjusting the opening of the air distributors on each branch main pipe in sequence, adjust the corresponding air distributors in descending order of the ratio of the actual air volume of the air outlet to the rated air volume of the air outlet under that branch main pipe.

4. The method for adjusting the air volume of a variable air volume air conditioning system according to claim 3, characterized in that: When adjusting the air distributor, reduce the opening of the air distributor until the ratio of the actual air volume to the rated air volume of the corresponding air outlet of the air distributor and the ratio of the actual air volume to the rated air volume of the branch pipe meet the rated difference.

5. The method for adjusting the air volume of a variable air volume air conditioning system according to any one of claims 1-4, characterized in that: By installing air volume sensors on the branch main pipes, the ratio of the actual air supply volume to the rated air supply volume of the branch main pipes can be detected in real time.

6. The method for adjusting the air volume of a variable air volume air conditioning system according to any one of claims 1-4, characterized in that: After adjusting the air damper, adjust the power of the central air conditioner so that the actual air volume of the central air conditioner is equal to the rated air volume. Detect the air volume of each air outlet. If the ratio of the air volume of an air outlet to the rated air volume of that air outlet is less than 90%, then adjust it again.

7. The method for adjusting the air volume of a variable air volume air conditioning system according to claim 6, characterized in that: If the ratio of the air volume of the air outlet to the rated air volume of the air outlet is less than 90%, adjust the air distributor corresponding to the air outlet.

8. The method for adjusting the air volume of a variable air volume air conditioning system according to any one of claims 1-4, characterized in that: The specified difference value satisfies the condition that the difference between the two ratios is less than 10%.

9. The method for adjusting the air volume of a variable air volume air conditioning system according to any one of claims 1-3, characterized in that: When the central air conditioner is in cooling mode, the target temperature is set to a specific difference from the actual temperature.

10. The method for adjusting the air volume of a variable air volume air conditioning system according to any one of claims 1-3, characterized in that: The statement that the air valve and the air distributor are at the same opening degree means that both the air valve and the air distributor are in the fully open state.

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