The Central Air-Conditioning Energy Saving System

2014 ◽  
Vol 986-987 ◽  
pp. 656-659
Author(s):  
Zheng Qian Feng ◽  
Chong Chao Pan
Keyword(s):  
Energy Saving ◽  
Air Conditioning ◽  
System Analysis ◽  
Operating Conditions ◽  
Optimal Process ◽  
Economic Operation ◽  
Consumption Data ◽  
Central Air Conditioning ◽  
Conditioning Equipment ◽  
Parameter Coupling

At present most of the research is aimed at the end of the central air conditioning equipment, not considering the inner link between each component of the central air conditioning. In order to achieve economic operation of equipment and systems, to maximize energy saving of central air conditioning, we designed and implemented a monitoring system analysis which considered in the system more equipments linkage, multi parameter coupling, and a variety of factor. It collected energy consumption data of each device, to get the system running in typical operating conditions of the system by simulating the optimal process parameters and guide debugging critical control equipment.

Simulation of Energy Saving Control for a Central Air Conditioning System

2011 ◽  
Author(s):  
Bing Wei ◽  
Na Pei ◽  
Jing Liu ◽  
Juan Tang
Keyword(s):  
Energy Saving ◽  
Air Conditioning ◽  
Maximum Load ◽  
Operating Conditions ◽  
Control Mode ◽  
Dynamic Adjustment ◽  
System Operation ◽  
Air Conditioning System ◽  
Central Air Conditioning ◽  
Energy Saving Control

In recent years with the sustainable development of economy, the energy consumption of air conditioning system has accounted for over 40% of the total of buildings in China. Energy conservation has become an important issue. Various energy wastes exist in the operation process of central AC systems. So the central air conditioning system of energy saving has great potential. Central air conditioning load changes with time-varying characteristics, the load and operating conditions are influenced by various factors such as season, weather, traffic and environmental conditions changing and so on. They are always changing, and always fluctuating. Even in the day, morning and evening have temperature changes. According to statistics it is only a short time for the occurrence of most buildings’ maximum load time, and air conditioning systems are running at part load conditions in most time. If air conditioning system operating control way cannot change load according to the dynamic adjustment, which necessarily causes enormous energy waste. In this paper, with the help of a typical building located in Baoding, China, the simulation of a central air-conditioning system was carried out. First, the simulation models of main equipments of a central air conditioning system are established. Second, according to the actual loads, simulation of the different energy control modes and the operation schemes were carried through. Third, the simulation curves were obtained. Finally, based on the comparison of simulation curves, the optimal energy saving control mode and the operation scheme of the central air conditioning system were analyzed, the energy saving potentials existing in the actual operating process were proposed. All these above will be very important for the AC system operation optimization of building energy-efficient and air conditioning system operation and management.

Study of Frequency Conversion Energy-Saving Reconstruction for Central Air-Conditioning

2014 ◽  
Vol 496-500 ◽  
pp. 1143-1146
Author(s):  
Hong Yan Hua ◽  
Zhen Zhang
Keyword(s):  
Energy Saving ◽  
Air Conditioning ◽  
Frequency Conversion ◽  
Water System ◽  
Variable Frequency ◽  
Air Conditioning System ◽  
Large Power ◽  
Central Air Conditioning ◽  
Conditioning Equipment ◽  
Control Principle

Water system is one of the significant compositions with large power consumption in air-conditioning equipment. From viewpoint of energy-saving, the variable frequency operational principle of the water system is analyzed, the merits and demerits of operating water system under power frequency or variable frequency are compared, and the control principle of the energy-saving revamping project is introduced. In addition, combining with the specific project, the benefit of energy-saving for the water system is analyzed. The result shows that after revamping, the air-conditioning system runs properly, both the indoor temperature and humidity meet the specifications; the revamping technology offers significant energy-saving effects.

scholarly journals Energy-saving diagnosis model of central air-conditioning refrigeration system in large shopping mall

2021 ◽  
Vol 7 ◽  
pp. 4035-4046
Author(s):  
Wenqiang Jing ◽  
Junqi Yu ◽  
Wei Luo ◽  
Chujun Li ◽  
XinYi Liu
Keyword(s):  
Energy Saving ◽  
Air Conditioning ◽  
Shopping Mall ◽  
Refrigeration System ◽  
Central Air Conditioning ◽  
Diagnosis Model

Air Conditioning System Water Quality and Equipment Condition Investigation and Analysis of Energy Saving Measures

2012 ◽  
Vol 516-517 ◽  
pp. 1224-1228
Author(s):  
Na Liang ◽  
Rui Li
Keyword(s):  
Energy Saving ◽  
Air Conditioning ◽  
Water System ◽  
Building Energy ◽  
Development Trend ◽  
Air Conditioning System ◽  
Effective Utilization ◽  
Energy Saving Potential ◽  
Central Air Conditioning ◽  
Points Of View

Due to energy reserves reduces gradually and uneven distribution, all countries pay more and more attention to energy saving and improve the effective utilization of energy, China also attaches great important to this. Energy saving of buildings is a necessary development trend. Air conditioning system as a large important part of building energy consumption has a huge energy-saving potential. This article mainly introduced the related strategies of energy saving in central air conditioning water system from the following three points of view: the water treatment, the cooling tower, and the variable frequency pump.

scholarly journals An Optimal Hybrid Control Method for Energy-Saving of Chilled Water System in Central Air Conditioning

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Yan Zhang ◽  
Xiaoli Chu ◽  
Yongqiang Liu
Keyword(s):  
Energy Saving ◽  
Hybrid System ◽  
Air Conditioning ◽  
Control Method ◽  
System Modeling ◽  
Water System ◽  
Variable Frequency ◽  
Optimum Control ◽  
Central Air Conditioning ◽  
Frequency Behavior

Chilled water system of central air conditioning is a typical hybrid system; variable frequency behavior with amplitude limited of pumps reflects continuous and discrete dynamic characteristics. The way of energy-saving is variable water volume, via variable frequency behavior of pumps to gain adjustment of power consumption. Facing the situation of the variable frequency pumps with parallel operation, single continuous or discrete modeling cannot reflect the hybrid features. Thus, the control method will have some questions, such as bad energy-saving effect, difficult accurate adjustment of cold capacity, and low running energy efficiency. However, hybrid system modeling can reflect hybrid dynamic behavior of pumps, which is combining continuous and discrete features. The questions of nonlinear and multiparameters can be solved by control method based on hybrid system. Here, an optimum control method is proposed with the principle of the minimum, by setting the minimum power consumption as the performance function in fixed time, which realizes variable control of pumps and accurate adjustment of temperature inside room. At last, it shows the system characteristics and energy-saving affection by hybrid system modeling and the optimum control method.

Energy-Saving Monitoring System of Central Air-Conditioning Based on Dynamic Load

2014 ◽  
Vol 1039 ◽  
pp. 409-414
Author(s):  
Tao Han ◽  
Xue Feng Lai ◽  
Liang Wen Yan ◽  
Zai Feng Zhang
Keyword(s):  
Energy Saving ◽  
Monitoring System ◽  
Dynamic Load ◽  
Pid Control ◽  
Air Conditioning ◽  
Water System ◽  
Air Conditioning System ◽  
Advantages And Disadvantages ◽  
Hardware System ◽  
Central Air Conditioning

This paper introduces the components of central air-conditioning system and compares the advantages and disadvantages of the PID control and fuzzy control.Fuzzy control theory and inverter technology are combined to design the Energy-Saving Monitoring System based on the fuzzy control box of STM32F103C8T6,Siemens S7-200 PLC, ABB inverter as the hardware system and interfaces configuration of KingView as the software. Experimental results show that the water system can be variable flow controlled based on the dynamic load, central air-conditioning energy efficiency the COP has greatly improved under the premise of ensuring the comfort of central air-conditioning.

Energy Saving Control System for Central Air-Conditioning Based on Terminal Temperature Measuring and Frequency Conversion Control Technology

2011 ◽  
Vol 201-203 ◽  
pp. 2144-2153
Author(s):  
Hong Yu Zhou ◽  
Xiao Jian Chen ◽  
Zi Hu Chen ◽  
Ming Wei Tong
Keyword(s):  
Control System ◽  
Energy Saving ◽  
Air Conditioning ◽  
Frequency Conversion ◽  
High Energy ◽  
Control Technology ◽  
Water Pump ◽  
Temperature Measuring ◽  
Central Air Conditioning ◽  
Energy Saving Control

In view of the insufficiency of central air-conditioning system that FCU, water pumps and air blower’s movement connot match with the actual operating load when varying duty, an energy saving control system for central air-conditioning based on terminal temperature measuring and frequency conversion control technology is proposed. This system can real-time measure different floors’ and nods’ temperatures in the building, and export orders to control the frequency of FCU, chilled water pump, cooling water pump and cooling tower air blower. To overcome big delay, large inertia and variable condition of control object, the dnamic fzzy nural network algorithm(DFNN), is applied into the control system. According to the practical running situations, the energy saving control system has advantages as high energy saving rate, high stability, good maintainability, which may be promoted the application vigorously.

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