Experimental Research of Operation Performance of the Capillary Radiant Air-Conditioning Terminal Integrated with DC Variable Speed New Air Unit

2011 ◽  
Vol 374-377 ◽  
pp. 547-552
Author(s):  
Jian Bo Chen ◽  
Fei Cheng ◽  
Fen Li
Keyword(s):  
Energy Saving ◽  
Experimental Research ◽  
Air Conditioning ◽  
Storage Capacity ◽  
Heat Storage ◽  
Operation Mode ◽  
Water System ◽  
Variable Speed ◽  
Operation Performance ◽  
Cooling Ability

By means of experiment, the author analyzed the operation performance of the capillary radiant air-conditioning terminal integrated with DC variable speed new air unit. The results show that the operation mode that the capillary radiant air-conditioning terminal running combined with DC variable speed new air unit not only avoid the disadvantages of the capillary radiant air-conditioning such as temperature dropping slowly, condensation of moisture under hot and humid conditions during the cooling season, but also effectively overcome the problem that the cooling ability of the radiation surface is low caused by avoiding condensation, and the system can also take the moisture load indoor away as well as achieve the purpose of dehumidification. Besides, using the heat storage capacity of the capillary radiant air-conditioning terminal, controlling water- system of capillary radiant air-conditioning terminal to open and close appropriately can achieve the goal of energy saving.

scholarly journals Systematic Method for the Energy-Saving Potential Calculation of Air-Conditioning Systems via Data Mining. Part I: Methodology

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 81
Author(s):  
Rongjiang Ma ◽  
Shen Yang ◽  
Xianlin Wang ◽  
Xi-Cheng Wang ◽  
Ming Shan ◽  
...  
Keyword(s):  
Data Mining ◽  
Energy Consumption ◽  
Energy Saving ◽  
Air Conditioning ◽  
Storage System ◽  
Operation Mode ◽  
Systematic Method ◽  
Potential Analysis ◽  
Energy Saving Potential ◽  
Air Conditioning Systems

Air-conditioning systems contribute the most to energy consumption among building equipment. Hence, energy saving for air-conditioning systems would be the essence of reducing building energy consumption. The conventional energy-saving diagnosis method through observation, test, and identification (OTI) has several drawbacks such as time consumption and narrow focus. To overcome these problems, this study proposed a systematic method for energy-saving diagnosis in air-conditioning systems based on data mining. The method mainly includes seven steps: (1) data collection, (2) data preprocessing, (3) recognition of variable-speed equipment, (4) recognition of system operation mode, (5) regression analysis of energy consumption data, (6) constraints analysis of system running, and (7) energy-saving potential analysis. A case study with a complicated air-conditioning system coupled with an ice storage system demonstrated the effectiveness of the proposed method. Compared with the traditional OTI method, the data-mining-based method can provide a more comprehensive analysis of energy-saving potential with less time cost, although it strongly relies on data quality in all steps and lacks flexibility for diagnosing specific equipment for energy-saving potential analysis. The results can deepen the understanding of the operating data characteristics of air-conditioning systems.

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.

scholarly journals Optimal operation strategy for subway HVAC system in transition seasons

2019 ◽  
Vol 111 ◽  
pp. 03006
Author(s):  
Yue Zhang ◽  
Xiaofeng Li ◽  
Bin Wang ◽  
Zheren Song
Keyword(s):  
Energy Saving ◽  
Calculation Method ◽  
Operation Mode ◽  
Water System ◽  
Optimal Operation ◽  
Operation Strategy ◽  
Ventilation Mode ◽  
Switching Condition ◽  
System Temperature ◽  
Switching Temperature

This paper mainly studied the operation strategy for subway VAC system during transition seasons. Two modes including WF-AC (Whole Fresh air- Air Conditioning) mode and B/E-V (Back/Exhausted fan-Ventilation) mode were selected based on energy saving principle. In order to decide the optimal operation mode, the calculation method of “switching temperature” was proposed. The main influencing factors of the switching condition include indoor cooling load, COP of the chilled-water-system, temperature difference of the supply air, efficiency of fan and the resistance of air duct. Also, the transfer temperature diagram is provided based on proposed calculation method, which is suitable for engineering use. The aim of this study is to regulate the operation mode and to promote energy saving in subway station.

Ground Mass Heat-Accumulating Capacity Evaluation at the Protective Structure Conditioning System Design Stage

2018 ◽  
Vol 931 ◽  
pp. 940-945
Author(s):  
Oleg A. Gubeladze ◽  
Avtandil R. Gubeladze ◽  
Larisa F. Kirilchik
Keyword(s):  
System Design ◽  
Air Conditioning ◽  
Storage Capacity ◽  
Heat Storage ◽  
Design Stage ◽  
Energy Costs ◽  
Protective Structure ◽  
Capacity Evaluation ◽  
Ground Mass

The possibility of using the heat-storage capacity of the soil massif surrounding the underground protective structure is under consideration with the purpose to minimize the energy costs of the projected system for technological air conditioning of the facility.

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.

scholarly journals Utilizing the solar thermal ice storage system in improving the energy, exergy, economic and environmental assessment of conventional air conditioning system

2021 ◽  
Author(s):  
Mohamed Elhelw ◽  
Wael M. El-Maghlany ◽  
Mohamed Shawky Ismail ‎
Keyword(s):  
Energy Saving ◽  
Air Conditioning ◽  
Storage System ◽  
Water System ◽  
Maximum Energy ◽  
Ice Storage ◽  
Air Conditioning System ◽  
Air System ◽  
Alexandria City ◽  
Air Conditioning Systems

Abstract This paper introduces novel modification for conventional air conditioning systems through utilizing a thermal ice storage system integrated with solar panels. Alexandria and Aswan, cities in Egypt, are chosen to represent two climates for hot-humid and hot-dry climates respectively. The governing equations for both heat and mass transfer are theoretically solved. Exergy analysis is performed for the proposed solar-ice thermal storage system via determining exergy destruction on ice and solar components as well as the total destruction based on transient analysis. This study was carried out on two common types of air conditioning systems, an air handling unit and fan coil unit. Results showed that, solar-ice storage system is more effective approach in hot-humid climate than hot-dry climate and more efficient with all-water air conditioning system than with all-air conditioning system. The maximum energy saving is 205.16 GJ having a percent of 27.5% in August for all water system in case of Alexandria city and 224.67 GJ with a percent of 25.38% in August for all-water system in case of Aswan city. All air system simulation showed maximum energy saving of 175.05 GJ with a percent of 18.13 % in case of August for Alexandria and 175.45 GJ having a percentage of 17.43% in case of Aswan in August. Moreover, the all-water system achieved a reduction in CO2 emissions by 467 tons/year in Aswan city and 390 tons/year in case of Alexandria city. While these reductions decrease to be 435 and 353 tons/year when the all-air system used for the same two cities.

A Numerical Simulation Study for the Performance of a Multi-Purpose Large Solar Hot Water System Operated in Taiwan

2016 ◽  
Author(s):  
Ru Yang ◽  
Yu-Ting Yen
Keyword(s):  
Simulation Study ◽  
Air Conditioning ◽  
Storage Capacity ◽  
Water System ◽  
Hot Water ◽  
Climate Data ◽  
Domestic Hot Water ◽  
Computer Simulation Program ◽  
Heating Load ◽  
Evacuated Tube

There is rich solar energy in Taiwan, it also has a great developing potential for solar applications. Solar hot water is able to supply the domestic hot water, the heating load, and the driving energy for absorption cooing. In this paper, a computer simulation program for a multi-purpose solar hot water system providing hot water, winter heating and summer air-conditioning is established by TRNSYS program. Simulation study is done with varying parameters including collector area, storage capacity and type of collector (flat plate and evacuated tube). In order to study the system performance in Taiwan, system simulations are made under the climate data of three representative cities (Taipei in north, Taichung in central, and Kaohsiung in southern) of Taiwan. The results of the present study can provide important reference for the development of the multi-purpose solar hot water system.

Analysis on Energy Saving Factors and Research on Energy Efficiency Evaluation Indexes of Ventilation and Air Conditioning System in the Underground Engineering

2013 ◽  
Vol 291-294 ◽  
pp. 682-687
Author(s):  
Shi Bin Geng ◽  
Sha Sha Chen ◽  
Ming Xing Xiao
Keyword(s):  
Energy Efficiency ◽  
Energy Saving ◽  
Air Conditioning ◽  
Water System ◽  
Efficiency Evaluation ◽  
Underground Engineering ◽  
Air Conditioning System ◽  
Evaluation Indexes ◽  
Heat System ◽  
Energy Efficiency Evaluation

This paper makes comprehensive analysis on energy saving factors of ventilation and air conditioning system in the underground engineering mainly from five aspects ,such as the overall scheme, cold - heat system, air system, water system and operation management . And based on this, furthermore, each energy saving factor is quantified , the energy efficiency evaluation indexes of each subsystem is studied .So that it provides a concrete and feasible evaluation index and its basic calculation method for energy-saving evaluation, diagnosis of energy saving and energy saving reconstruction work.

The Application of Radiant Concrete Ceiling’s Heat Storage in Wu Han, China

2011 ◽  
Vol 374-377 ◽  
pp. 847-850
Author(s):  
Na Li ◽  
Dong Li Yuan
Keyword(s):  
Control System ◽  
Cost Saving ◽  
Energy Saving ◽  
Temperature Control ◽  
Air Conditioning ◽  
Heat Storage ◽  
Operating Cost ◽  
Electricity Price ◽  
Temperature Control System ◽  
Intermittent Operation

In temperature and humidity independent control system, although the heat storage capability of the concrete ceiling is not big, for energy-saving building with small air-conditioning load, its potential of operating cost’ saving is not negligible. Based on an energy-saving dwelling building’s typical room in Wu Han, China, this paper dynamically analyzes the room’s load and concrete ceiling’s radiating capability, get conclusion that: according to the peak-valley electricity price and reasonable intermittent operation strategy, the temperature control system can save cost by 16.6% in summer, 27.3% in winter.

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