CN104879893A - Centralized control method of precise air conditioning system - Google Patents

Abstract

A centralized control method for a precision air conditioning system. It includes a temperature rise control method and a temperature drop control method. Beneficial effects of the centralized control method of the precision air-conditioning system provided by the present invention: On the premise that the indoor temperature distribution is uniform and the air-conditioners are placed on the same side of the machine room with consistent intervals, a single air-conditioning system is established for the precision air-conditioning system within the same machine room. The mathematical relationship between the number of times the air conditioner is turned on and the service life is considered, and the status of multiple precision air conditioners is comprehensively considered. The goal is to maximize the service life of the air conditioner system, and the opening and closing strategies are adjusted at any time according to changes in indoor temperature and humidity. On the premise of ensuring the safe and stable operation of the machine room, the present invention avoids the frequent start and stop of a single precision air conditioner, prolongs the service life of the air conditioner system, saves the maintenance cost of the machine room, and has strong economic value.

Description

A Centralized Control Method for Precision Air Conditioning System

technical field

The invention belongs to the technical field of precision air-conditioning control, and in particular relates to a centralized control method of a precision air-conditioning system.

Background technique

The computer room usually houses various devices such as main servers, workstations, switches, and core routers. These devices consume a lot of power and generate a lot of heat. According to statistics, in the case of the base temperature, the reliability of the computer will drop by 25% for every 10°C increase in temperature. Therefore, in order to ensure the safety of the computer room, ensure the safe, stable and reliable operation of the information system, standardize the environment of the computer room, and avoid the safety risks caused by it to the greatest extent, it is necessary to control the temperature and humidity of the computer room within an appropriate range. The precision air conditioner is a precision air conditioner dedicated to the computer room that can fully meet the environmental conditions of the computer room. It can not only control the temperature of the computer room, but also control the humidity at the same time, so it is also called constant temperature and humidity air conditioner. However, at present, the cost of a single precision air conditioner is as high as more than 100,000 yuan, and the service life is only about 10 years. Therefore, how to prolong the service life of precision air conditioners has become an urgent problem to be solved.

Through the observation of multiple precision air conditioners in the existing computer room, it is found that the start and stop rules are as follows: once the ambient temperature or humidity is detected to exceed a reasonable range, it will be started immediately, and the ambient temperature or humidity will be turned off immediately when it reaches the shutdown range. Multiple precision air conditioners lack a unified control strategy, resulting in frequent start and stop of a single air conditioner. Through the analysis of the various components of the precision air conditioner, it is found that the air conditioner compressor is the main factor affecting its life, and the life of the compressor is positively related to the number of times it is started. Once it is started, the current shock will reduce the life by one time. Therefore, the lifespan of a precision air conditioner is closely related to the number of starts and stops. The current control method will inevitably cause the precision air conditioner to start and stop frequently, thereby shortening its lifespan and increasing maintenance costs.

Contents of the invention

In order to solve the above problems, the object of the present invention is to provide a centralized control method for a precision air conditioning system.

In order to achieve the above object, the centralized control method of the precision air-conditioning system provided by the present invention includes: the centralized control method of the precision air-conditioning system includes a temperature rise control method and a temperature drop control method, wherein the temperature drop control method includes the following steps executed in order:

Step 2.1) monitor the indoor temperature in real time, once the temperature exceeds the upper limit 1, then go to step 2.2), otherwise repeat step 2.1;

Step 2.2) Use a mathematical model to select a precision air conditioner with the smallest consumed life to turn on, delay n△t, and go to step 2.3);

Step 2.3) Judging whether the indoor temperature has dropped to the set value or below, if the judgment result is yes, then go to step 2.4), otherwise go to step 2.2);

Step 2.4) Judging whether the number of precision air conditioners that have been turned on is greater than or equal to 1, if the judgment result is yes, then go to step 2.5), otherwise go to step 2.1);

Step 2.5) Using a mathematical model, select a precision air conditioner with the smallest consumed life to turn off, delay n△t, and go to step 2.6);

Step 2.6) Judging whether the indoor temperature is between the set value and the lower boundary 2, if the judgment result is yes, then go to step 2.4), otherwise go to step 2.7);

Step 2.7) Judging whether the indoor temperature reaches the lower boundary 2 or below, if the judgment result is yes, then turn off all precision air conditioners, and go to step 2.1); otherwise, go directly to step 2.1);

The temperature rise control method includes the following steps performed in order:

Step 3.1) monitor the indoor temperature in real time, once the temperature is lower than the lower boundary 1, turn to step 3.2), otherwise repeat step 3.1);

Step 3.2) Use a mathematical model to select a precision air conditioner with the smallest consumed life to turn on, delay n△t, and go to step 3.3);

Step 3.3) Judging whether the indoor temperature has risen to the set value or above, if the judgment result is yes, then go to step 3.4, otherwise go to step 3.2);

Step 3.4) Judging whether the number of precision air conditioners that have been turned on is greater than or equal to 1, if the judgment result is yes, then go to step 3.5), otherwise go to step 3.1);

Step 3.5) Use a mathematical model to select a precision air conditioner with the smallest consumed life to turn off, delay n△t, and go to step 3.6);

Step 3.6) Judging whether the indoor temperature is between the set value and the upper boundary 2, if the judgment result is yes, then go to step 3.4), otherwise go to step 3.7);

Step 3.7) Judging whether the indoor temperature reaches the upper boundary 2 or above, if the judgment result is yes, turn off all precision air conditioners, and then go to step 3.1); otherwise, go directly to step 3.1).

In step 2.2), step 2.5), step 3.2) and step 3.5), the objective function of the mathematical model is: $\left\{\begin{array}{c}{\mathrm{D.}}_K=\min ({\mathrm{D.}}_1,{\mathrm{D.}}_2,......,{\mathrm{D.}}_k)\\ \mathrm{Number}=K\end{array}\right.,$ In the formula, 1, 2,..., k are the numbers of the precision air conditioners that can be opened, D _K is the shortest service life among the precision air conditioners that can be opened, K is the number of the precision air conditioner with the shortest service life, and Number is the selected Precision Air Conditioning No.

Beneficial effects of the centralized control method of the precision air-conditioning system provided by the present invention: On the premise that the indoor temperature distribution is uniform and the air-conditioners are placed on the same side of the machine room with consistent intervals, a single air-conditioning system is established for the precision air-conditioning system within the same machine room. The mathematical relationship between the number of times the air conditioner is turned on and the service life is considered, and the status of multiple precision air conditioners is comprehensively considered. The goal is to maximize the service life of the air conditioner system, and the opening and closing strategies are adjusted at any time according to changes in indoor temperature and humidity. On the premise of ensuring the safe and stable operation of the machine room, the present invention avoids the frequent start and stop of a single precision air conditioner, prolongs the service life of the air conditioner system, saves the maintenance cost of the machine room, and has strong economic value.

Description of drawings

Fig. 1 is the machine room equipment and precision air-conditioning placement diagram that adopt the centralized control method of the precision air-conditioning system provided by the present invention;

Figure 2 is a schematic diagram of the dynamic process of a single precision air conditioner;

Fig. 3 is a flow chart of the centralized control method of the precision air-conditioning system when the room temperature is too high;

Fig. 4 is a flow chart of the centralized control method of the precision air conditioning system when the room temperature is too low.

Detailed ways

The centralized control method of the precision air conditioning system provided by the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The present invention assumes that the indoor temperature is evenly distributed, and the air conditioners are placed on the same side of the machine room with consistent intervals. The locations of equipment and air conditioners in the equipment room are shown in Figure 1.

The centralized control method of the precision air conditioning system provided by the present invention includes a temperature rise control method and a temperature drop control method. When the indoor temperature is too high, the temperature drop control method is adopted to reduce the indoor temperature; Room temperature.

Figure 2 shows the basic dynamic process of a single precision air conditioner, taking the cooling control method as an example. The temperature drop process corresponds to power consumption, that is, the use of precision air conditioning to reduce the indoor temperature. A rise in temperature means that the device is off, and the rise in temperature is due to heat dissipation from the device in the room. The upper and lower boundaries 1 are the upper and lower limits of the temperature required by the computer room, and the set value is the most suitable temperature for the computer room. In the case of high room temperature, the precision air conditioner is turned on to adjust the room temperature only when the upper limit 1 is exceeded. In order to avoid the frequent start and stop of precision air conditioners caused by indoor temperature fluctuations, the present invention sets that when the indoor temperature drops to the set value or below, the precision air conditioners can be turned off in turn; 1. All precision air conditioners must be turned off. As shown in Figure 2, when the indoor temperature is higher than the upper boundary 1, the air conditioner is turned on, and when the indoor temperature drops to the lower boundary 2, all precision air conditioners are turned off. t ₁ , t ₂ , t ₃ , and t ₄ are four time points respectively, and the precision air conditioner is in the on state during t ₁ -t ₂ and t ₃ -t ₄ time periods.

Conversely, if the indoor temperature is too low, the temperature rise control method is adopted, that is, the temperature rise process means that the precision air conditioner is used to adjust to increase the room temperature, and the temperature drop process is the change of the room temperature after the precision air conditioner is turned off. Then the precision air conditioner is turned on when the temperature is lower than the lower boundary 1, and all are turned off when the temperature rises to the upper boundary 2.

In order to overcome the lack of centralized control of the precision air conditioner in the machine room at present, and the frequent start and stop of a single precision air conditioner, which seriously affects the service life of the air conditioner, the present invention provides a centralized control method for the precision air conditioner system.

The centralized control method of the precision air-conditioning system proposed by the present invention adopts a real-time monitoring method to sample the indoor temperature and humidity every Δt cycle, so as to realize the control of multiple precision air-conditioning systems. Among them, the △t period can be set from several seconds to several hours according to the control requirements, n△t represents multiple sampling periods, and the purpose of delaying n△t is to make the indoor temperature and humidity reach a relatively stable state. In the following, the indoor temperature is too high and too low as an example for illustration, and the control method for the situation of too high and too low humidity is the same.

As shown in Figure 3, the cooling control method in the centralized control method of the precision air conditioning system provided by the present invention includes the following steps executed in order:

Step 2.1) monitor the indoor temperature in real time, once the temperature exceeds the upper limit 1, then go to step 2.2), otherwise repeat step 2.1;

Step 2.2) Use a mathematical model to select a precision air conditioner with the smallest consumed life to turn on, delay n△t, and go to step 2.3);

Step 2.3) Judging whether the indoor temperature has dropped to the set value or below, if the judgment result is yes, then go to step 2.4), otherwise go to step 2.2);

Step 2.4) Judging whether the number of precision air conditioners that have been turned on is greater than or equal to 1, if the judgment result is yes, then go to step 2.5), otherwise go to step 2.1);

Step 2.5) Using a mathematical model, select a precision air conditioner with the smallest consumed life to turn off, delay n△t, and go to step 2.6);

Step 2.6) Judging whether the indoor temperature is between the set value and the lower boundary 2, if the judgment result is yes, then go to step 2.4), otherwise go to step 2.7);

Step 2.7) Judging whether the indoor temperature reaches the lower boundary 2 or below, if the judgment result is yes, turn off all precision air conditioners, and go to step 2.1); otherwise, go directly to step 2.1).

As shown in Figure 4, the temperature rise control method in the centralized control method of the precision air conditioning system provided by the present invention includes the following steps executed in order:

Step 3.1) monitor the indoor temperature in real time, once the temperature is lower than the lower boundary 1, then turn to step 3.2), otherwise repeat step 3.1);

Step 3.2) Use a mathematical model to select a precision air conditioner with the smallest consumed life to turn on, delay n△t, and go to step 3.3);

Step 3.3) Judging whether the indoor temperature has risen to the set value or above, if the judgment result is yes, then go to step 3.4, otherwise go to step 3.2);

Step 3.4) Judging whether the number of precision air conditioners that have been turned on is greater than or equal to 1, if the judgment result is yes, then go to step 3.5), otherwise go to step 3.1);

Step 3.5) Use a mathematical model to select a precision air conditioner with the smallest consumed life to turn off, delay n△t, and go to step 3.6);

Step 3.6) Judging whether the indoor temperature is between the set value and the upper boundary 2, if the judgment result is yes, then go to step 3.4), otherwise go to step 3.7);

Step 3.7) Judging whether the indoor temperature reaches the upper boundary 2 or above, if the judgment result is yes, turn off all precision air conditioners, and then go to step 3.1); otherwise, go directly to step 3.1).

In step 2.2), step 2.5), step 3.2) and step 3.5), the mathematical model described is the mathematical relationship between the precision air conditioner’s service life and the number of openings; if it is considered that the precision air conditioner’s service life is 1, then the precision air conditioner has consumed The lifetime D can be expressed as:

$\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}$

Among them, n represents the number of times the precision air conditioner has been turned on, and N is the number of times the precision air conditioner can be started within the entire life cycle (that is, the number of times the air conditioner compressor can be started).

The specific description of the above mathematical model is as follows:

The objective function of the mathematical model is: $\left\{\begin{array}{c}{\mathrm{D.}}_K=\min ({\mathrm{D.}}_1,{\mathrm{D.}}_2,......,{\mathrm{D.}}_k)\\ \mathrm{Number}=K\end{array}\right.,$ In the formula, 1, 2,..., k are the numbers of the precision air conditioners that can be opened, D _K is the shortest service life among the precision air conditioners that can be opened, K is the number of the precision air conditioner with the shortest service life, and Number is the selected Precision Air Conditioning No.

The centralized control method of the precision air-conditioning system provided by the present invention fully solves the problem of frequent startup and shutdown of a single precision air-conditioner in a machine room, prolongs the service life of the precision air-conditioning system, and its characteristics are mainly reflected in the following aspects:

1. It can centrally control multiple precision air conditioning systems, and make unified decisions based on the status of each precision air conditioner, increasing the average service life of the precision air conditioning system.

2. The control method formulates the opening and closing strategy of the precision air conditioner, selects the precision air conditioner to be turned on and off according to the service life of a single precision air conditioner, and comprehensively considers the state of the entire precision air conditioner system, and according to the indoor temperature and humidity The change controls the opening and closing of the precision air conditioner, avoiding the frequent start and stop of a single precision air conditioner.

Claims (2)

1. A centralized control method for a precision air-conditioning system, characterized in that: the centralized control method for the precision air-conditioning system includes a temperature-rising control method and a temperature-dropping control method, wherein the temperature-dropping control method includes the following steps performed in order: Step 2.1) monitor the indoor temperature in real time, once the temperature exceeds the upper limit 1, then go to step 2.2), otherwise repeat step 2.1; Step 2.2) Using a mathematical model, select a precision air conditioner with the smallest consumed life to turn on, delay nΔt, and go to step 2.3); Step 2.3) Judging whether the indoor temperature has dropped to the set value or below, if the judgment result is yes, then go to step 2.4), otherwise go to step 2.2); Step 2.4) Judging whether the number of precision air conditioners that have been turned on is greater than or equal to 1, if the judgment result is yes, then go to step 2.5), otherwise go to step 2.1); Step 2.5) Using a mathematical model, select a precision air conditioner with the smallest consumed life to turn off, delay nΔt, and go to step 2.6); Step 2.6) Judging whether the indoor temperature is between the set value and the lower boundary 2, if the judgment result is yes, then go to step 2.4), otherwise go to step 2.7); Step 2.7) Judging whether the indoor temperature reaches the lower boundary 2 or below, if the judgment result is yes, then turn off all precision air conditioners, and go to step 2.1); otherwise, go directly to step 2.1); The temperature rise control method includes the following steps performed in order: Step 3.1) monitor the indoor temperature in real time, once the temperature is lower than the lower boundary 1, then turn to step 3.2), otherwise repeat step 3.1); Step 3.2) Use a mathematical model to select a precision air conditioner with the smallest consumed life to turn on, delay nΔt, and go to step 3.3); Step 3.3) Judging whether the indoor temperature has risen to the set value or above, if the judgment result is yes, then go to step 3.4, otherwise go to step 3.2); Step 3.4) Judging whether the number of precision air conditioners that have been turned on is greater than or equal to 1, if the judgment result is yes, then go to step 3.5), otherwise go to step 3.1); Step 3.5) Using a mathematical model, select a precision air conditioner with the smallest consumed life to turn off, delay nΔt, and go to step 3.6); Step 3.6) Judging whether the indoor temperature is between the set value and the upper boundary 2, if the judgment result is yes, then go to step 3.4), otherwise go to step 3.7); Step 3.7) Judging whether the indoor temperature reaches the upper boundary 2 or above, if the judgment result is yes, turn off all precision air conditioners, and then go to step 3.1); otherwise, go directly to step 3.1). 2. the centralized control method of precision air-conditioning system according to claim 1, is characterized in that: in step 2.2), step 2.5), step 3.2) and step 3.5), the objective function of described mathematical model is: $\left\{\begin{array}{c}{\mathrm{D.}}_K=\min ({\mathrm{D.}}_1,{\mathrm{D.}}_2,......,{\mathrm{D.}}_k)\\ \mathrm{Number}=K\end{array}\right.,$ In the formula, 1, 2,..., k are the numbers of the precision air conditioners that can be opened, D _K is the shortest service life among the precision air conditioners that can be opened, K is the number of the precision air conditioner with the shortest service life, and Number is the selected Precision Air Conditioning No.