A13 Research and Development on Improvement in Performance of Heat Exchangers for Air-conditioners

2007 ◽  
Vol 2007 (0) ◽  
pp. 25-32
Author(s):  
Yutaka Shibata
Keyword(s):  
Research And Development ◽  
Heat Exchangers ◽  
Air Conditioners

Recuperators in Gas Turbine Systems

1998 ◽  
Author(s):  
Esa Utriainen ◽  
Bengt Sundén
Keyword(s):  
Research And Development ◽  
Gas Turbine ◽  
Cross Sections ◽  
Heat Exchangers ◽  
Power Plants ◽  
Pressure Ratio ◽  
Compact Heat Exchangers ◽  
Thermodynamic Cycles ◽  
Large Pressure ◽  
Gas Turbine Cycle

The application of recuperators in advanced thermodynamic cycles is growing due to stronger demands of low emissions of pollutants and the necessity of improving the cycle efficiency of power plants to reduce the fuel consumption. This paper covers applications and types of heat exchangers used in gas turbine units. The trends of research and development are brought up and the future need for research and development is discussed. Material aspects are covered to some extent. Attempts to achieve compact heat exchangers for these applications are also discussed. With the increasing pressure ratio in the gas turbine cycle, large pressure differences between the hot and cold sides exist. This has to be accounted for. The applicability of CFD (Computational Fluid Dynamics) is discussed and a CFD–approach is presented for a specific recuperator. This recuperator has narrow wavy ducts with complex cross-sections and the hydraulic diameter is so small that laminar flow prevails. The thermal-hydraulic performance is of major concern.

Rolling of Aluminum

2019 ◽  
Author(s):  
Kai F. Karhausen ◽  
Antti S. Korhonen
Keyword(s):  
Aluminum Alloys ◽  
Cold Rolling ◽  
Hot Rolling ◽  
Heat Exchangers ◽  
Thin Foil ◽  
Aluminum Sheet ◽  
Lightweight Construction ◽  
Sheet Rolling ◽  
Air Conditioners

Because of its lightweight and strength, aluminum alloys are used are being used increasing for the production of lightweight construction. In addition to applications in the expanding transportation market, aluminum sheet and foil materials are traditionally used for food and medical packaging, thin foil, and fin stock for air conditioners and heat exchangers, decorative panels and lithographic sheet. Rolling is a process used for the production of strip or sheet. In this article, rolling processing of aluminum and aluminum alloys is discussed in detail and specific processes include: hot-rolling, cold-rolling, and rolling of aluminum foils.

State-of-the-Art in Micro- and Meso-Scale Heat Exchangers

1999 ◽  
Author(s):  
Reza Shekarriz ◽  
Charles J. Call
Keyword(s):  
Heat Exchanger ◽  
Research And Development ◽  
Heat Exchangers ◽  
State Of The Art ◽  
The State ◽  
Manufacturing Processes ◽  
Review Of The Literature ◽  
Design Constraints ◽  
Recent Advances ◽  
Meso Scale

Abstract A review of the literature and the state-of-the-art in research and development of miniature heat exchangers is presented in this paper. The authors provide a discussion of what makes the micro- and meso-scales important, highlight the design constraints and challenges that surface when miniaturizing a heat exchanger, and outline and discuss the outstanding practical and scientific issues in this area. Finally, the most recent advances in manufacturing processes and application of these miniature heat exchangers are covered in this article.

Research and Develop on Series of Cryogenic Methanol Coil-Wound Heat Exchanger

2014 ◽  
Vol 1070-1072 ◽  
pp. 1769-1773
Author(s):  
Zhou Wei Zhang ◽  
Ya Hong Wang ◽  
Jia Xing Xue
Keyword(s):  
Heat Exchanger ◽  
Research And Development ◽  
Heat Exchangers ◽  
Multiphase Flows ◽  
Major Research ◽  
Research Directions ◽  
Structure Characteristics ◽  
Standardization Process

A series of cryogenic methanol coil-wound heat exchangers with multi-stream and multiphase flows were researched and developed, including methanol-methanol cooler, cryogenic recycle methanol cooler, unshifted gas cooler, shifted gas cooler, feed gas cooler etc. The winding structure characteristics and the work principle of the spiral pipe bundles were elaborated to help the scientific design and calculation of coil-wound heat exchanger in cryogenic methanol field and to promote the research and development of standardization process. The major research directions and the critical scientific problems were forecasted.

scholarly journals An experimental study of the air-side particulate fouling in fin-and-tube heat exchangers of air conditioners

2003 ◽  
Vol 20 (5) ◽  
pp. 873-877 ◽  
Author(s):  
Young-Chull Ahn ◽  
Jae-Min Cho ◽  
Hee-Soo Shin ◽  
Yu-Jin Hwang ◽  
Chang-Gun Lee ◽  
...  
Keyword(s):  
Experimental Study ◽  
Heat Exchangers ◽  
Air Conditioners ◽  
Particulate Fouling

CFD in Design and Development of Heat Exchangers

2005 ◽  
Author(s):  
Bengt Sunden
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Research And Development ◽  
Heat Exchangers ◽  
Design Research ◽  
Turbulence Modeling ◽  
Design And Development

This paper gives a brief summary of CFD (computational fluid dynamics) methods and turbulence modeling for applications in the design, research and development of heat exchangers. Some examples are shown to demonstrate how CFD methods can be used as engineering tools. Nevertheless, limitations and shortcomings as well as need for further research are highlighted.

scholarly journals Review of Hygroscopic Coating on Aluminum Fin Surface of Air Conditioning Heat Exchanger

2021 ◽  
Vol 11 (11) ◽  
pp. 5193
Author(s):  
Song He ◽  
Wang Chen ◽  
Wansheng Yang ◽  
Xudong Zhao
Keyword(s):  
Energy Consumption ◽  
Heat Exchangers ◽  
Air Conditioning ◽  
High Water ◽  
Preparation Methods ◽  
Air Conditioners ◽  
Heat Transfer Efficiency ◽  
Hydrophilic Surfaces ◽  
Air Conditioning Systems

Air conditioning energy consumption accounts for most building energy consumption, indoor dehumidification is the main cause of air conditioning energy consumption. Optimize the dehumidification methods of air conditioning systems have great significance to the development of green buildings and people’s pursuit of comfort. Improvement of fins on air conditioning heat exchangers is a hot topic of current research and has achieved considerable results in terms of indoor dehumidification and energy saving compared to traditional air conditioners. This paper reviews two kinds of heat exchangers modified by coating, including desiccant-coated heat exchangers and hydrophobic/hydrophilic coated heat exchangers. For desiccant-coated heat exchangers, the preparation methods of advanced desiccant materials and the possibilities of using this material to achieve excellent energy efficiencies were presented, and the operating parameters that affect thermal performance and dehumidification are determined, including airflow temperature, air velocity, inlet air relative humidity, and regeneration temperature. For hydrophobic/hydrophilic coated heat exchangers, different kinds of hybrid hydrophobic-hydrophilic surfaces are highlighted for they are a high water droplet nucleation rate and surface heat transfer efficiency. In addition, the challenges and future works are explained at last. This paper will provide a valuable reference for the follow-up research, which will be helpful for indoor humidity control and reducing the energy consumption of air conditioning.

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