scholarly journals Energy efficiency modes of confunction of central air conditioning system and local recirculation cooling system

2016 ◽  
pp. 43-56
Author(s):  
N.V. Kochenkov ◽  
V.N. Kochenkov ◽  
Ya.A. Shakirov ◽  
A.P. Aleksandrova
Keyword(s):  
Energy Efficiency ◽  
Air Conditioning ◽  
Cooling System ◽  
Air Conditioning System ◽  
Central Air Conditioning

The Energy Efficiency Reconstruction and Energy Consumption Assessments about a Library in Guangzhou

2011 ◽  
Vol 374-377 ◽  
pp. 672-676
Author(s):  
Liu Zhi Chen ◽  
Xiao Ning Xu ◽  
Han Wei Liu
Keyword(s):  
Energy Efficiency ◽  
Control System ◽  
Energy Consumption ◽  
Air Conditioning ◽  
Network Control ◽  
Operational Control ◽  
Network Control System ◽  
Air Conditioning System ◽  
Operational Management ◽  
Central Air Conditioning

How to reduce the energy consumption of the central air-conditioning is important for the building energy efficiency. The energy efficiency reconstruction of the central air-conditioning system on one library in Guangzhou is completed with the network control system self-developed. The operational control and operational management is integrated in the network control system. The energy consumption before and after reconstruction about the air-conditioning system of the library is detected and analyzed in the paper. The result shows the mode that operational control and operational management integrated has better energy efficiency.

A Double-Layers Energy Efficiency Evaluation Method of Central Air-Conditioning System

2013 ◽  
Vol 860-863 ◽  
pp. 1666-1669
Author(s):  
Bing Wen Wang ◽  
Yuan Yuan Liu ◽  
Shan Shan Shi ◽  
Gan Zhou ◽  
Shuang Hu Wang
Keyword(s):  
Energy Efficiency ◽  
Air Conditioning ◽  
Evaluation Method ◽  
High Energy ◽  
National Standard ◽  
Double Layers ◽  
Efficiency Evaluation ◽  
Air Conditioning System ◽  
Central Air Conditioning ◽  
Energy Efficiency Evaluation

It is necessary to monitor and optimize work status of central air-conditioning system (CACS) due to its high energy consumption. According to national standard, this paper designed a practical energy-efficiency evaluation method with double-layers structure. The upper-layer indicator reflects the whole energy efficiency of CACS. The lower-layer indicators reflect the energy efficiency of each subsystem of CACS, such as refrigeration system, chilled water system and terminal system. Using this double-layers evaluation system, the managers of CACS can not only observe the whole energy efficiency level but also find out the weak point of the system.

ANALYSIS OF COMPETING VARIANTS OF AIR CONDITIONING SYSTEMS WITHOUT AIR EXTRACTION FROM ENGINES AT THE STAGE OF PASSENGER AIRCRAFT ONBOARD SYSTEMS CONCEPTUAL DESIGN

2019 ◽  
Vol 6 (3) ◽  
pp. 80-85
Author(s):  
Denis Igorevich Smagin ◽  
Konstantin Igorevich Starostin ◽  
Roman Sergeevich Savelyev ◽  
Anatoly Anatolyevich Satin ◽  
Anastasiya Romanovna Neveshkina ◽  
...  
Keyword(s):  
Conceptual Design ◽  
Air Conditioning ◽  
Research University ◽  
Cooling System ◽  
Fuel Efficiency ◽  
Air Cooling ◽  
Moscow Aviation Institute ◽  
Air Conditioning System ◽  
Low Efficiency ◽  
Air Conditioning Systems

One of the ways to achieve safety and comfort is to improve on-board air conditioning systems.The use of air cooling machine determines the air pressure high level at the point of selection from the aircraft engine compressor. Because of the aircraft operation in different modes and especially in the modes of small gas engines, deliberately high stages of selection have to be used for ensuring proper operation of the refrigeration machine in the modes of the aircraft small gas engines. Into force of this, most modes of aircraft operation have to throttle the pressure of the selected stage of selection, which, together with the low efficiency of the air cycle cooling system, makes the currently used air conditioning systems energy inefficient.A key feature of the architecture without air extraction from the main engines compressors is the use of electric drive compressors as a source of compressed air.A comparative analysis of competing variants of on-board air conditioning system without air extraction from engines for longrange aircraft projects was performed at the Moscow Aviation Institute (National Research University).The article deals with the main approaches to the decision-making process on the appearance of a promising aircraft on-board air conditioning system at the stage of its conceptual design and formulated the basic requirements for the structure of a complex criterion at different life cycle stages.The level of technical and technological risk, together with a larger installation weight, will require significant costs for development, testing, debugging and subsequent implementation, but at the same time on-board air conditioning system scheme without air extraction from the engines will achieve a significant increase in fuel efficiency at the level of the entire aircraft.

Rechargeable Personal Air Conditioning Device

2016 ◽  
Author(s):  
Yilin Du ◽  
Jan Muehlbauer ◽  
Jiazhen Ling ◽  
Vikrant Aute ◽  
Yunho Hwang ◽  
...  
Keyword(s):  
Air Conditioning ◽  
Cooling System ◽  
Cooling Capacity ◽  
Comfort Level ◽  
Vapor Compression ◽  
Air Conditioning System ◽  
System A ◽  
Single Person ◽  
Vapor Compression Cycle ◽  
Compression Cycle

A rechargeable personal air-conditioning (RPAC) device was developed to provide an improved thermal comfort level for individuals in inadequately cooled environments. This device is a battery powered air-conditioning system with the phase change material (PCM) for heat storage. The condenser heat is stored in the PCM during the cooling operation and is discharged while the battery is charged by using the vapor compression cycle as a thermosiphon loop. The conditioned air is discharged towards a single person through adjustable nozzle. The main focus of the current research was on the development of the cooling system. A 100 W cooling capacity prototype was designed, built, and tested. The cooling capacity of the vapor compression cycle measured was 165.6 W. The PCM was recharged in nearly 8 hours under thermosiphon mode. When this device is used in the controlled built environment, the thermostat setting can be increased so that building air conditioning energy can be saved by about 5–10%.

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