This article applies multiple nonlinear regression methods to establish a forecasting model for the load characteristics of air conditioning in shopping malls at different times. Based on Python data, determine the functional relationship of refrigerant parameters concerning pressure and temperature. The article uses kernel smoothing estimation technology to calculate the room temperature probability density distribution of users participating in DLC to characterize the user's comfort. The article's research results show that the average error between the regression analysis results of refrigerant parameters and the reference value is within 1%. This model is suitable for medium and long-term load forecasting. It has high prediction accuracy for the sudden change trend with a turning point.

#### Keywords

- Load forecasting
- Multiple nonlinear regression method
- Regression index
- Mall air conditioning

#### MSC 2010

- 62J02

As central air-conditioning is an important infrastructure and main energy-consuming equipment in public buildings, we must adopt reasonable operation adjustment methods to improve energy efficiency. As the basis for optimizing air-conditioning operation, air-conditioning load forecasting is also the key to the efficient and economical operation of cold storage air-conditioning systems. With the continuous progress and development of load forecasting methods, there are now many different air conditioning load forecasting methods. In practical applications, each forecasting method cannot meet the current project due to its limitations and applicable conditions [1]. This article intends to analyze and compare several typical air-conditioning load forecasting methods based on actual engineering. The purpose is to meet the engineering practicability of air-conditioning load forecasting. Since there are many forecasting methods, we select five typical methods of linear regression, nonlinear regression, exponential smoothing, grey forecasting, and artificial neural network from different forecasting methods to study the cooling load forecast of central air conditioning. Modeling simulation analysis compares the characteristics and practicability of the above five typical forecasting methods. We expect to obtain a guiding method for air-conditioning system load forecasting in practical engineering applications.

The cooling load of the central air-conditioning system is a typical nonlinear model with random characteristics such as slow time-varying, multi-interference, and uncertainty [2]. Air-conditioning load forecasting mainly relies on various interference factors that affect the air-conditioning cooling load to predict the air-conditioning cooling load at a certain time or within a certain period in the future.

Studies have shown that the degree of interference from outdoor meteorological factors to the cooling load of air conditioning is in order of outdoor dry bulb temperature, outdoor solar radiation, outdoor relative humidity, outdoor wind speed, weather conditions, and day of the week [3]. Therefore, three outdoor interference factors, outdoor dry bulb temperature, humidity, and total radiation, are selected as the interference input in this experiment. The article combines the hourly air-conditioning daily load and weather data of a certain building from June 1 to September 30 provided by the Shurisi competition platform for modeling and forecasting. We model the first 2905 sets of data as learning objects. Output the comparative data of the forecasted load and actual load on the last day, September 30, to analyze the characteristics of the forecasting method.

Different assessment indicators can reflect different focuses of load forecasting. Because this article predicts the short-term cooling load of the building, we use the method of statistical probability analysis to investigate the specific daily load forecast accuracy and the percentage of qualified daily points [4]. Among them, the daily load accuracy rate focuses on the overall characterization of the load forecast error. The percentage of daily pass points focuses on the investigation of single-point load forecast errors. The calculation method for the accuracy of daily load forecasting is as follows:

_{k}_{Fi}_{Ri}_{i}_{i}

_{1} is the number of qualified points in the predicted load at 24 o’clock each day. The forecast date of _{i}

The accuracy of load forecasting is directly related to the mathematical model of building load. With the continuous development of modeling and simulation technology, load forecasting has made great progress [5]. With the gradual deepening of theoretical research, the method of load forecasting is constantly improving. This article first introduces four typical forecasting methods based on mathematical statistics and analyzes the characteristics of different forecasting methods when the research object remains unchanged.

The linear regression method uses regression analysis to determine the relationship between input and output variables [6]. It is a method based on mathematical-statistical analysis, and linearity means that the relationship between input and output variables is composed of straight lines. Its expression form is _{i} x_{i}

In this experiment, three main factors that impact the cooling load of air-conditioning were selected. There are three inputs in the regression model, namely dry bulb temperature, radiation intensity and humidity. In turn, _{1}, _{2}, _{3} is the input variable, _{1}, _{2}, _{3}, _{4} is the input parameter, and

The parameter values of multiple linear regression are obtained by simulation, _{1} = − 7941.88, _{2} = 316.20, _{3} = 25.42, _{4} = 3.17. We compare the predicted value with the actual value in Excel to calculate the relative error _{i}_{1} = −1274.9%, and the percentage of qualified daily points is _{1} = 0.0%.

If the output variable of the regression model is one or more functional forms of the input variable, then the regression model is shown in the form of a curve on the graph. This type of model is called nonlinear regression [7]. According to the number of input variables, the nonlinear regression model is divided into two types: one yuan and multiple. In this experiment, as shown in formula (5), the multivariate nonlinear cubic function is used for modeling. Substitute the input and output quantities and simulate in MATLAB to get the comparison curve shown in Figure 2.

The parameter value _{1} = 0.14, _{2} = −0.05, _{3} = 1.99 of multiple nonlinear linear regression is obtained by simulation. We compare the predicted value with the actual value in Excel to calculate the relative error _{i}_{2} = − 164.9%, and the percentage of qualified daily points is _{2} = 0.0%.

Exponential smoothing forecasts are by using raw load data as input. A method of introducing a weighting factor into the original data to obtain the predicted data. This belongs to the category of time series forecasting [8]. The basic idea of the exponential smoothing forecasting method is that the forecasted value is a weighted sum of historical data. We give different weights to different historical data. The new data is given a larger weight, and the old data is given a smaller weight. In this experiment, to make the prediction result more accurate, the three-time exponential smoothing method is used for prediction. Its principle formula is as follows:

When the original data is a stationary series, the value range of the parameter _{3} = 12.5%.

Grey forecasting treats discrete data scattered on the time axis as a set of continuously changing sequences. The anonymous information in the gray system is weakened [9]. At the same time, we strengthen the influence of known factors to construct a continuous differential equation with time as a variable. The parameters of gray prediction are determined by mathematical methods to achieve the purpose of prediction. It has the advantages of fewer data samples, a good short-term forecasting effect, and a simple calculation process.

Our model for predicting the gray system is called the gray model (GM). The general expression is the GM(n,x) model. Its specific meaning is to use n-order differential equations to model x variables.

The GM(1,4) model is used in this experiment. That is, the first-order differential equation is used to build a model for 4 variables. The comparative data was obtained by calculation (Figure 4). The calculated daily load forecast accuracy rate is _{4} = 1.6%, and the daily pass point percentage is _{4} = 0.0%.

In this experiment, the first 2905 groups of experimental data are selected as the training set for training. We use the last 24 sets of data as test samples to make predictions. The experiment uses a three-layer feedforward network. Determine the input layer variables like the actual load value, dry bulb temperature, radiation intensity, and humidity. The number of neurons in the input layer is

Before entering the experimental data, the data should be normalized first to achieve comparability between data indicators. The normalization processing of neural networks generally has a variable value between [− 1, 0],[− 1,1] and [1, 0]. This is done to weaken the impact of some variables on the model when the value is large. In this experiment, the variable's value was converged to eliminate larger errors and obtain more accurate experimental results. After normalizing the data, the neural network is built. We create a BP neural network with input layer node 4, hidden layer node 12, and output node 1. Set the maximum number of iteration steps to 1000, set the learning rate to 0.05, and set the learning target to 0.000000001 (Figure 5). Then enter the data and start learning.

According to the calculation (Figure 6), the accuracy rate of daily load forecast is _{5} = 99.96%, and the percentage of qualified daily points is _{5} = 100%.

This experiment is based on the historical weather data and air conditioning cooling load data of a building from June 30 to September 29 to model, learn, predict, and output the air conditioning cooling load data for the whole day on September 30. This is short-term load forecasting. After simulation in MATLAB, the prediction results output by different prediction methods are obtained. Make a unified comparison in Table 6 and analyze the characteristics of each method.

Comparison table of forecasting methods.

Method of prediction | Prediction accuracy | Response speed/s | Input variable requirements | Ease of modeling | Applicability |
---|---|---|---|---|---|

Linear regression | A1=−1274.9% | 4.57 | Influencing factors and historical load | easy | Linear model |

R1=0% | |||||

Nonlinear regression | A2=−164.9% | 1.49 | Influencing factors and historical load | Easier | Nonlinear model |

R2=0% | |||||

Exponential smoothing | A3=50.7% | 0.78 | Influencing factors and historical load | Harder | Arbitrary model |

R3=12.5% | |||||

Grey forecast | A4=1.6% | 0.46 | Historical load | easy | Linear model |

R4=0% | |||||

BP neural network | A5=99.96% | 7.54 | Influencing factors and historical load | difficult | Arbitrary model |

100% |

1) The accuracy of the linear regression prediction method is very low. This is because the load model of the air conditioner is not linear. Since the linear regression model connects two adjacent prediction points in a linear relationship, points with larger errors and slower response speed are prone to appear in the modeling process. The response speed of linear regression prediction will be longer and longer, and the single point error will be bigger and bigger.

2) The accuracy of the nonlinear regression prediction method is also low. Although the nonlinear model is a curve connecting the adjacent points of load forecasting, the learning ability of the nonlinear regression model is poor. The model is likely to be inapplicable because the air conditioning load changes affected by weather factors are more different than the previous day. Therefore, nonlinear regression prediction also has large errors for load models with large fluctuations in load changes. However, the response speed and accuracy of nonlinear prediction are improved compared with linear regression prediction.

3) The exponential smoothing method obviously has higher accuracy and fast response speed than the previous two forecasting methods. Exponential smoothing considers the weight of the load around the forecast day and the recent load trend, so this forecasting method can more reasonably reflect the changing trend of the load. And every time it is smoothed, the accuracy of the prediction results will be higher [10]. This method is suitable for low-precision medium and long-term load forecasting. Grey forecast modeling is very easy and only needs historical load data to model, so the calculation and response are fast. But similar to linear regression forecasting, gray forecasting is also suitable for linear short-term load forecasting.

4) BP neural network is the prediction method with the highest prediction accuracy. Its modeling process is complicated, and its response speed is prolonged, so its forecasting accuracy is very high for short-term and medium-term load forecasting. Its response speed is also within the tolerance range of general engineering applications. It can be seen that the proportion of neural networks in practical applications is also very large.

Choosing a suitable forecasting method for load forecasting is of great significance in actual engineering. It is necessary to comprehensively consider the actual air-conditioning load time length, accuracy requirements, response speed, data requirements, and modeling difficulty to select a load forecasting method suitable for the actual project to achieve the best forecasting effect. The neural network method has a slower response speed but higher forecast accuracy, and it is suitable for short-term load forecasting with higher accuracy requirements. The seasonal exponential smoothing method has faster response speed and higher accuracy, and better engineering application value.

#### Comparison table of forecasting methods.

Method of prediction | Prediction accuracy | Response speed/s | Input variable requirements | Ease of modeling | Applicability |
---|---|---|---|---|---|

Linear regression | A1=−1274.9% | 4.57 | Influencing factors and historical load | easy | Linear model |

R1=0% | |||||

Nonlinear regression | A2=−164.9% | 1.49 | Influencing factors and historical load | Easier | Nonlinear model |

R2=0% | |||||

Exponential smoothing | A3=50.7% | 0.78 | Influencing factors and historical load | Harder | Arbitrary model |

R3=12.5% | |||||

Grey forecast | A4=1.6% | 0.46 | Historical load | easy | Linear model |

R4=0% | |||||

BP neural network | A5=99.96% | 7.54 | Influencing factors and historical load | difficult | Arbitrary model |

100% |

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