scholarly journals ATTRIBUTION ANALYSIS OF RELIABILITY AND PROPOSAL OF SYSTEMS : Reliability evaluation method for air-conditioning systems with co-generation system Part 2

2004 ◽  
Vol 69 (584) ◽  
pp. 53-59 ◽  
Author(s):  
Hirofumi HAYAMA ◽  
Yosuke ANAMI ◽  
Hitoshi WATANABE ◽  
Masahiro HAYASHI ◽  
Masamichi ENAI ◽  
...  
Keyword(s):  
Air Conditioning ◽  
Evaluation Method ◽  
Reliability Evaluation ◽  
Generation System ◽  
Attribution Analysis ◽  
System Part ◽  
Air Conditioning Systems

scholarly journals A Reliability Evaluation Method for Independent Small Offshore Electric Systems

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3035
Author(s):  
Jun Guan ◽  
Wei Du ◽  
Xiuli Wang ◽  
Xianjue Luo ◽  
Xingyang Liu ◽  
...  
Keyword(s):  
Power System ◽  
Distribution System ◽  
Evaluation Method ◽  
Reliability Evaluation ◽  
Transmission System ◽  
Load Shedding ◽  
Generation System ◽  
Electric System ◽  
Reliability Indicators ◽  
Offshore Oil

As an independent power system, the reliability of offshore electric system is closely related to the smooth progress of offshore oil production. There are two major characteristics of this type of power system. One is that it includes a generation system, transmission system, as well as a distribution system, and the other is that the load shedding measures in the event of a fault are different from that of the onshore power grid. Therefore, traditional reliability assessment models and algorithms cannot be used directly. Based on the theory of overall reliability evaluation, a reliability evaluation method suitable for offshore electric systems and the corresponding reliability indicators are proposed in this paper. In state sampling, the overall system sampling is divided into generation system sampling, transmission system sampling, and distribution system sampling based on the hybrid sampling theory. In state assessment, the priority decoupling load shedding model and the cascade fault model are established considering the actual production. At the end of this paper, the power system of an offshore oil platform is taken as an actual example to calculate the reliability index. Based on the failure analysis, relevant measures to improve the reliability of the system are proposed.

scholarly journals Energy Performance Evaluation of Hybrid VRF Systems Based on Japanese Government-Designated Method

2019 ◽  
Vol 111 ◽  
pp. 04029
Author(s):  
Tokimi Kawase ◽  
Atsushi Hashimoto ◽  
Ken Yasuda ◽  
Tatsuo Nobe
Keyword(s):  
Performance Evaluation ◽  
Air Conditioning ◽  
Evaluation Method ◽  
Energy Performance ◽  
Energy Price ◽  
Air Conditioning System ◽  
Gas Engine ◽  
Energy Evaluation ◽  
Japanese Law ◽  
Air Conditioning Systems

Variable Refrigerant Flow Rate (VRF) System is used as air-conditioning systems in small and medium-sized buildings in Japan. Traditionally, the two most common types of VRF systems are electric motor driven VRF Systems (EHP) and gas engine driven VRF Systems (GHP). However, in recent years’ society is increasingly demanding energy saving and the best energy mix. This requires an air-conditioning system that has energy flexibly depending on the application and situation. As a result, a hybrid airconditioning system (called Hybrid VRF System) that satisfies theses need has been developed. The developed system can operate according to energy price and usage situations by connecting GHP and EHP with one refrigerant cycle. In recent years, a Hybrid VRF Systems have been used for small to mediumsized buildings. In this paper, the author evaluated the performance of an integrated Hybrid VRF System based on the energy evaluation method prescribed by Japanese law.

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.

Sign in / Sign up

Export Citation Format

Share Document