CN111814388A - CFD simulation verification method for lower air supply data center based on neural network - Google Patents
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Abstract
The invention relates to the technical field of artificial intelligence, in particular to a CFD simulation verification method for a lower air supply data center based on a neural network, which comprises the following steps: step 1: selecting initial data of a machine room to establish a CFD simulation model of the machine room, and calculating through CFD software to obtain a simulation result; step 2: acquiring the actual inlet air temperature of the cabinet and the actual power of the air conditioner according to a certain sampling period as training samples of the neural network; and step 3: establishing a neural network model; and 4, step 4: inputting the training samples into a neural network to predict the predicted power of the air conditioners, and obtaining the influence degree of the cooled condition of the cabinet and the actual power of each air conditioner; and 5: and comparing the flow field result under the floor of the machine room obtained by the neural network prediction with the simulation result, and adjusting the position of the cabinet in the machine room by the adjusted initial data to optimize the airflow layout of the machine room. The method has the advantages that the cooling effect of the cabinet is more obvious, and the cabinet is convenient to use.
Description
Technical Field
The invention relates to the technical field of artificial intelligence, in particular to a CFD simulation verification method for a lower air supply data center based on a neural network.
Background
In the whole life cycle of the computer room data center, along with the updating and upgrading of the IT equipment, the power density of the computer room equipment is greatly improved compared with the power density of the computer room equipment in the initial construction stage, and therefore higher requirements are put forward on a computer room cooling system. The problem of equipment overheating cannot be thoroughly solved by blindly increasing the number of air conditioners or reducing the set temperature of the air conditioners, and the energy consumption of a computer room data center can be greatly increased, which also becomes a main bottleneck limiting the capacity expansion of the computer room data center. In fact, if the airflow organization of the data center of the computer room is not reasonable, even if the total cooling capacity of the air conditioner is far greater than the heat production capacity of the IT equipment, the phenomenon that the inlet temperature of part of the equipment is overhigh still occurs. And the problem of excessive cooling can be caused by reducing the set temperature of the air conditioner, and the refrigeration energy consumption is high.
In the existing process of utilizing CFD software to conduct energy-saving reconstruction on a data center, air is colorless and transparent, so that whether the gas flow range in a CFD simulation result is consistent with the actual situation or not cannot be judged intuitively and efficiently. In view of this, we propose a lower blowing data center CFD simulation verification method based on a neural network.
Disclosure of Invention
The invention aims to provide a CFD simulation verification method of a lower air supply data center based on a neural network, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a lower air supply data center CFD simulation verification method based on a neural network comprises the following steps:
step 1: selecting initial data of a machine room to establish a CFD simulation model of the machine room, and calculating through CFD software to obtain a simulation result;
step 2: acquiring the actual inlet air temperature of the cabinet according to a certain sampling period, and simultaneously carving the actual power of the air conditioner, and taking the actual inlet air temperature of the cabinet and the actual power of the air conditioner as training samples of a neural network;
and step 3: preprocessing a training sample, establishing a neural network model of the actual inlet air temperature and time of a certain cabinet and the actual power and time of each air conditioner, and determining the number of layers and nodes of the neural network of the model;
and 4, step 4: inputting the training samples into a neural network to be calculated to be convergent, predicting the predicted power of the air conditioner through the actual inlet air temperature of the cabinet by the neural network, and carrying out correlation analysis on the predicted power and the actual power data of the air conditioner to obtain the influence degree of the cooled condition of the cabinet and the actual power of each air conditioner;
and 5: and predicting to obtain a flow field result under the floor of the machine room through a neural network, comparing the flow field result under the floor of the machine room with the simulation result, repeatedly adjusting the initial data of the simulation model to enable the flow field result under the floor to be close to the simulation result, adjusting the position of a cabinet in the machine room according to the adjusted initial data, and optimizing the airflow layout of the machine room.
Preferably, in step 1, the initial data includes, but is not limited to, the size and shape of the machine room, the position and size of the obstacle, the height of the raised floor, the type and position of the air conditioner, the air volume and cooling capacity of the air conditioner, the size of the under-floor piping and cable bridge, the position and opening area of the air supply floor, the position, geometry, and orientation of the server cabinet, and the actual heat load of the server cabinet.
Preferably, in step 1, the simulation result includes, but is not limited to, a cloud map and a flow chart of the flow field distribution under the floor of the machine room.
Preferably, in step 2, a temperature sensor is installed at the cabinet air inlet position to obtain the actual cabinet air inlet temperature.
Preferably, in step 3, the training samples are preprocessed by a normalization method, so that the actual intake air temperature data and the actual power data are in the same order of magnitude.
Preferably, in step 3, the number of neurons in the hidden layer is preliminarily determined according to an empirical formula, and the number of neurons is finally determined by using training samples and training and comparing networks containing different numbers of neurons.
Compared with the prior art, the invention has the beneficial effects that: the CFD simulation verification method for the lower air supply data center based on the neural network comprises the steps of selecting initial data of a machine room, establishing a CFD simulation model of the machine room, calculating by CFD software to obtain a simulation result, taking actual air inlet temperature of a cabinet and actual power of an air conditioner as training samples of the neural network, training and learning the training samples by a manager neural network model, predicting a flow field result under the floor of the machine room by the neural network, comparing the flow field result under the floor of the machine room with the simulation result, repeatedly adjusting the initial data of the simulation model to enable the flow field result under the floor to be close to the simulation result, adjusting the position of the cabinet in the machine room according to the adjusted initial data, optimizing the airflow layout of the machine room, enabling the cooling effect of the cabinet to be more obvious and facilitating use.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a line graph of the relationship between the measured cabinet inlet air temperature and time in the present invention;
fig. 3 is a line graph of the relationship between the measured total power of the air conditioner and time according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, a technical solution provided by the present invention is:
a CFD simulation verification method of a lower air supply data center based on a neural network comprises the following steps:
step 1: selecting initial data of a machine room to establish a CFD simulation model of the machine room, and calculating by CFD software to obtain a simulation result;
step 2: acquiring the actual inlet air temperature of the cabinet according to a certain sampling period, and simultaneously carving the actual power of the air conditioner, and taking the actual inlet air temperature of the cabinet and the actual power of the air conditioner as training samples of a neural network;
and step 3: preprocessing a training sample, establishing a neural network model of the actual inlet air temperature and time of a certain cabinet and the actual power and time of each air conditioner, and determining the number of layers and nodes of the neural network of the model;
and 4, step 4: inputting the training samples into a neural network to be calculated to be convergent, predicting the predicted power of the air conditioner through the actual inlet air temperature of the cabinet by the neural network, and carrying out correlation analysis on the predicted power and the actual power data of the air conditioner to obtain the influence degree of the cooled condition of the cabinet and the actual power of each air conditioner;
and 5: and predicting to obtain a flow field result under the floor of the machine room through a neural network, comparing the flow field result under the floor of the machine room with the simulation result, repeatedly adjusting the initial data of the simulation model to enable the flow field result under the floor to be close to the simulation result, adjusting the position of a cabinet in the machine room according to the adjusted initial data, and optimizing the airflow layout of the machine room.
In this embodiment, in step 1, the initial data includes, but is not limited to, the size and shape of the machine room, the position and size of the obstacle, the height of the raised floor, the type and position of the air conditioner, the air volume and cooling capacity of the air conditioner, the size of the under-floor piping and the cable bridge, the position and opening area of the air supply floor, the position, geometric size and orientation of the server cabinet, the actual heat load of the server cabinet, and the more detailed information provided about the layout and size of the devices in the machine room in the initial data, so that the simulation result of the CFD is closer to the actual condition.
Further, in step 1, the simulation result includes, but is not limited to, a cloud map and a flow map of the airflow distribution under the floor of the machine room, so that information about the airflow distribution in the machine room, which is included in the simulation result, can be displayed more intuitively.
It is worth to be noted that, in the step 2, a temperature sensor is installed at the cabinet air inlet position to obtain the actual air inlet temperature of the cabinet, the model of the temperature sensor can be LM35DZ, and a matched circuit and a power supply of the temperature sensor are also provided by the manufacturer; in addition, the invention relates to circuits, electronic components and modules which are all in the prior art, and can be completely realized by a person skilled in the art, and needless to say, the protection content of the invention also does not relate to the improvement of software and a method, and the temperature change of an air inlet position of a cabinet is convenient to monitor in real time.
Specifically, in step 3, the training samples are preprocessed by a normalization method, so that the actual intake air temperature data and the actual power data are in the same order of magnitude.
In addition, in step 3, the number of neurons in the hidden layer is preliminarily determined according to an empirical formula, and the number of neurons is finally determined by training and comparing the training samples and the networks containing different numbers of neurons.
Further, in step 2, the sampling period time interval is preferably 30 minutes, and is used for collecting the influence of the cold air of the air conditioner on the cabinets in different time periods.
Specifically, in step 4, when the correlation analysis is performed on the predicted power and the actual power data of the air conditioner in this embodiment, if the analyzed value is within the (-1, -0.5) interval, it is determined that the position of the cabinet is covered by the output airflow range of the air conditioner, and if the value is outside the interval, it is determined that the output airflow range of the air conditioner is covered by the cabinet.
It should be noted that when the result of the under-floor flow field is close to the simulation result, the position of the cabinet in the machine room does not need to be moved, and when the difference between the result of the under-floor flow field and the simulation result is large, the initial data is repeatedly adjusted to make the result close, and the position and the size of the equipment in the machine room are adjusted according to the initial data, so that the effects of optimizing the air flow layout in the machine room, improving the air inlet temperature distribution of the cabinet and improving the refrigeration efficiency of the air conditioner are achieved.
Specifically, the formula of the neural network model is as follows:
l is the number of neural network layers, the 0 th layer is an input layer, the last layer is an output layer, and the middle layer is a hidden layer;
w is a weight of the image,representing the weight value between the k neuron of the l-1 layer and the j neuron of the l layer;
b is the offset for correction;
the nonlinear activation function is:
wherein,
the inlet air temperature of each cabinet and the power of each air conditioner are used as input data, the result of each layer is calculated by the output of the previous layer, and the weight and the offset value of each layer are corrected through training, so that the error between the predicted output and the target output is controlled within an acceptable range.
In addition, the normalization method is to map the cabinet inlet air temperature and the air conditioner power data into the range of 0-1 for processing, namely changing the numerical value into a decimal between (0, 1) for the convenience of data processing;
and the normalization method adopts the following formula:
it is worth noting that generally, increasing the number of hidden layers can reduce network errors and improve accuracy, but also complicates the network, thereby increasing network training time, but at present, there is no formula capable of determining the number of hidden layer neurons. The number of neurons in the hidden layer can be preliminarily determined only according to the past empirical formula, and then the network containing different numbers of neurons is trained and compared by using the sample set, so that the number of neurons is finally determined.
The empirical formula is:
wherein h is the number of neurons in the hidden layer, m and n are the numbers of neurons in the input layer and the output layer respectively, and a is a regulation constant between 1 and 10.
When the lower air supply data center CFD simulation verification method based on the neural network is used, initial data of the machine room is selected to establish a CFD simulation model of the machine room, a simulation result is obtained through CFD software calculation, the actual air inlet temperature of the cabinet and the actual power of the air conditioner are collected according to a certain sampling period, the actual air inlet temperature of the cabinet and the actual power of the air conditioner are taken as training samples of the neural network, the training samples are preprocessed, a neural network model of the actual air inlet temperature and time of a certain cabinet and the actual power and time of each air conditioner is established, the number of layers and the number of nodes of the neural network of the model are determined, the training samples are input into the neural network to be calculated to be convergent, the neural network predicts the predicted power of the air conditioner through the actual air inlet temperature of the cabinet, and the predicted power and the actual power data of the air conditioner are subjected to correlation analysis, the influence degree of the cabinet cold condition and the actual power of each air conditioner is obtained, the underfloor flow field result of the machine room is obtained through neural network prediction, the underfloor flow field result of the machine room is compared with the simulation result, the initial data of the simulation model is adjusted repeatedly, the underfloor flow field result and the simulation result are close to each other, the position of the cabinet in the machine room is adjusted according to the adjusted initial data, the airflow layout of the machine room is optimized, the cooling effect of the cabinet is more remarkable, and the cabinet cooling device is convenient to use.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A CFD simulation verification method of a lower air supply data center based on a neural network is characterized by comprising the following steps: the method comprises the following steps:
step 1: selecting initial data of a machine room to establish a CFD simulation model of the machine room, and calculating through CFD software to obtain a simulation result;
step 2: acquiring the actual inlet air temperature of the cabinet according to a certain sampling period, and simultaneously carving the actual power of the air conditioner, and taking the actual inlet air temperature of the cabinet and the actual power of the air conditioner as training samples of a neural network;
and step 3: preprocessing a training sample, establishing a neural network model of the actual inlet air temperature and time of a certain cabinet and the actual power and time of each air conditioner, and determining the number of layers and nodes of the neural network of the model;
and 4, step 4: inputting the training samples into a neural network to be calculated to be convergent, predicting the predicted power of the air conditioner through the actual inlet air temperature of the cabinet by the neural network, and carrying out correlation analysis on the predicted power and the actual power data of the air conditioner to obtain the influence degree of the cooled condition of the cabinet and the actual power of each air conditioner;
and 5: and predicting to obtain a flow field result under the floor of the machine room through a neural network, comparing the flow field result under the floor of the machine room with the simulation result, repeatedly adjusting the initial data of the simulation model to enable the flow field result under the floor to be close to the simulation result, adjusting the position of a cabinet in the machine room according to the adjusted initial data, and optimizing the airflow layout of the machine room.
2. The lower blowing data center CFD simulation verification method based on the neural network as claimed in claim 1, wherein: in step 1, the initial data includes, but is not limited to, the size and shape of the machine room, the position and size of the obstacle, the height of the raised floor, the type and position of the air conditioner, the air volume and cooling capacity of the air conditioner, the size of the under-floor piping system and the cable bridge, the position and opening area of the air supply floor, the position, geometric size and orientation of the server cabinet, and the actual heat load of the server cabinet.
3. The lower blowing data center CFD simulation verification method based on the neural network as claimed in claim 1, wherein: in step 1, the simulation result includes, but is not limited to, a cloud chart and a flow chart of the flow field distribution under the floor of the machine room.
4. The lower blowing data center CFD simulation verification method based on the neural network as claimed in claim 1, wherein: and step 2, installing a temperature sensor at the air inlet position of the cabinet to obtain the actual air inlet temperature of the cabinet.
5. The lower blowing data center CFD simulation verification method based on the neural network as claimed in claim 1, wherein: in step 3, the training sample is preprocessed by a normalization method, so that the actual inlet air temperature data and the actual power data are in the same order of magnitude.
6. The lower blowing data center CFD simulation verification method based on the neural network as claimed in claim 1, wherein: in step 3, the number of neurons in the hidden layer is preliminarily determined according to an empirical formula, and the number of the neurons is finally determined by utilizing training samples and training and comparing networks containing different neuron numbers.
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