Abstract
The setting curve and control method of internal temperature in trains are studied in this paper to achieve energy saving control for air conditioning systems. First, a model of interior temperature that considers the heat transmission from infiltration air is established according to the relationship between the equivalent leakage area for the train body and the pressure difference between the internal and external carriage. Second, the interior temperature setting curve, which changes adaptively with the ambient temperature, is established considering the energy consumption of air conditioning systems and passengers’ thermal comfort. Finally, an adaptive iterative learning control (AILC) algorithm is proposed and applied to control the interior temperature according to the periodicity of train operation. In this paper, meteorological data from a typical meteorological year are used for simulation analysis. Simulation results show that the AILC algorithm can effectively track the interior temperature setting value and has a better control effect when the train runs on the same line repeatedly. Under the action of the AILC algorithm, the root-mean-square error is reduced to 0.069 °C in the third iteration. Furthermore, the energy saving for a single carriage in a single process reaches up to 1.534 kW·h, thus achieving energy saving control.
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Abbreviations
- c :
-
Specific heat capacity (J/kg·°C)
- d a :
-
Moisture content of air (kg/kg)
- e :
-
Error
- F :
-
Heat transfer area (m2)
- h :
-
Enthalpy of air (J/kg)
- h 1 :
-
Enthalpy of refrigerant before entering the compressor (J/kg)
- h 4 :
-
Enthalpy of refrigerant flow out of the expansion valve (J/kg)
- J :
-
Solar radiation intensity (W/m2)
- k :
-
Heat transfer coefficient (W/m2·K)
- K P :
-
Proportionality coefficient
- L :
-
Length of the error signal
- m :
-
Mass (kg)
- m a :
-
Mass flow rate of refrigerant (kg/s)
- M :
-
Molar mass (g/mol)
- n :
-
Number of occupations
- n r :
-
Speed of the compressor (r/s)
- P :
-
Pressure (Pa)
- q r :
-
Solar radiation entering the train through window glasses (W/m2)
- q s :
-
Average heat dissipation for an adult (W/person)
- q ρ :
-
Solar radiation absorbed by window glasses (W/m2)
- Δ q :
-
Cooling capacity per unit of refrigerant (J/kg)
- Q :
-
Heat changes in the carriages (W)
- Q 0 :
-
Cooling capacity (W)
- Q 1 :
-
Heat transmission from insulation walls (W)
- Q 2 :
-
Heat transmission from window glasses (W)
- Q 3 :
-
Heat dissipation from occupations (W)
- Q 4 :
-
Heat dissipation from equipment (W)
- Q 5 :
-
Heat transmission from fresh air (W)
- Q 6 :
-
Heat transmission from infiltrating air (W)
- R :
-
Molar gas constant (J/mol·K)
- s :
-
Shading factor of window glasses
- S :
-
Area of the sealing gap (m2)
- t :
-
Time (s)
- T :
-
Temperature (°C)
- T B0 :
-
Setting value of interior temperature (°C)
- T C :
-
Solar-air temperature (°C)
- V :
-
Volume of the train (m3)
- V fa :
-
Gas exchange caused by air conditions (m3/s)
- V gap :
-
Gas exchange caused by the sealing gap (m3/s)
- V s :
-
Compressor displacement per revolution (m3/r)
- α :
-
Convection heat transfer coefficient (W/m2·K)
- κ :
-
Absorptivity to the solar radiation
- η :
-
Volumetric efficiency of compressors
- ρ :
-
Density of air (kg/m3)
- ρ α :
-
Density of refrigerant (kg/m3)
- φ r :
-
Clustering coefficient
- B :
-
Internal air
- H :
-
External air
- i, j :
-
Serial number
- w :
-
Window glasses
- AC :
-
Adaptive control
- AE :
-
Absolute error
- AILC :
-
Adaptive iterative learning control
- APE :
-
Absolute percentage error
- DP :
-
Difference in pressure
- DT :
-
Difference between ambient temperature and interior temperature
- ELA :
-
Equivalent leakage area
- HVAC :
-
Heating, ventilation, and air conditioning
- HSTs :
-
High-speed trains
- ILC :
-
Iterative learning control
- MAE :
-
Maximum absolute error
- MAPE :
-
Maximum absolute percentage error
- MDT :
-
Maximum DT
- PC :
-
Power consumption
- RMSE :
-
Root-mean-square error
- TC :
-
Traditional control
- VVVF :
-
Variable voltage and variable frequency
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Acknowledgments
This work is supported by the National Natural Science Foundation of China under grant nos. 51975487 and 52372402.
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Chunjun Chen received his Ph.D. from Southwest Jiaotong University in 2006 and his M.A. from University of Electronic Science and Technology of China in 1993. He is a Professor at the School of Mechanical Engineering, Southwest Jiaotong University; Director of Department of Measurement and Control and Mechano-electronic Measurement and Control Laboratorial Center; and Deputy Director of the Technology and Equipment of Rail Transit Operation and Maintenance Key Laboratory of Sichuan Province. His research interests include vibration, noise and aerodynamics of high-speed trains, traffic equipment, electromechanical systems, advanced control and measurement theory, and electromechanical control and measurement system.
Qin Zheng is currently a master’s candidate at the School of Mechanical Engineering at Southwest Jiaotong University. Her research interests are intelligent sensing, diagnosis, and control of rail transportation operation and maintenance equipment.
Lu Yang received his M.S. in vehicle engineering from Southwest Jiaotong University, Chengdu, China, in 2021. He is currently pursuing his Ph.D. at Southwest Jiaotong University, Chengdu, China. His research interests include performance testing, diagnosis, and control of rail transit equipment.
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Chen, C., Zheng, Q. & Yang, L. Adaptive iterative learning control of internal temperature for high-speed trains. J Mech Sci Technol 38, 463–473 (2024). https://doi.org/10.1007/s12206-023-1238-3
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DOI: https://doi.org/10.1007/s12206-023-1238-3