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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Air-Conditioning and Refrigeration Engineering
Journal Basic Information
Journal DOI :
The Society of Air-Conditioning and Refrigerating Engineers of Korea
Editor in Chief :
Lee, Dae Young
Volume & Issues
Volume 22, Issue 12 - Dec 2010
Volume 22, Issue 11 - Nov 2010
Volume 22, Issue 10 - Oct 2010
Volume 22, Issue 9 - Sep 2010
Volume 22, Issue 8 - Aug 2010
Volume 22, Issue 7 - Jul 2010
Volume 22, Issue 6 - Jun 2010
Volume 22, Issue 5 - May 2010
Volume 22, Issue 4 - Apr 2010
Volume 22, Issue 3 - Mar 2010
Volume 22, Issue 2 - Feb 2010
Volume 22, Issue 1 - Jan 2010
Selecting the target year
Performance Variation of the Air Curtain for Various Discharge Angles in Feating Space
Sung, Sun-Kyung ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 22, issue 2, 2010, Pages 57~63
Air curtains are widely used for gates of shopping mall, warehouse, cold stores and refrigerated display cabinets. The purpose of the air curtain is to reduce the infiltration of outdoor air and heat loss from the air conditioning space to ambient air. The discharge angle of air curtain is very important as the sealing efficiency is affected by it. This paper presents a performance of single jet air curtain in heating space when the discharge angle of nozzle changes. A numerical simulation is used to study the influence of various parameters on the efficiency of the downward-blowing air curtain device which is installed inside of the wall above the door. The performance of the air curtain is evaluated by sealing efficiency which provides the assessment of the energy savings. A condition of discharge angle that has the highest sealing efficiency is proposed.
A Study for the Water Droplet on a Stripe-patterned Surface
Choi, Ho-Jin ; Hong, Seung-Do ; Ha, Man-Yeong ; Yoon, Hyun-Sik ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 22, issue 2, 2010, Pages 64~69
We investigated the variation in contact angle of a nano-sized water droplet on a nano stripe-patterned surface using molecular dynamics simulation. By changing the height and width of the stripe pillar, and the gap width of the stripes, we observed the contact angle of water droplet in equilibrium. When the surface energies were 0.1 and 0.3 kcal/mol, the calculated contact angles were in good agreement with the Cassie and Baxter equation. However, when the surface energy is 0.5 kcal/mol, the contact angles are observed to be perturbed along the Cassie and Baxter equation.
Mathematical Models of a Transformer Cooling System for the Control Algorithm Development
Han, Do-Young ; Noh, Hee-Jeon ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 22, issue 2, 2010, Pages 70~77
In order to improve the efficiency of a main transformer in a train, the optimal operation of a cooling system is necessary. For the development of optimal control algorithms of a cooling system, mathematical models of a main transformer cooling system were developed. These include static and dynamic models of a main transformer, an oil pump, an oil cooler, and a blower. Static models were used to find optimal oil temperatures of the inlet and the outlet of a transformer. Dynamic models were used to predict transient performances of control algorithms of a blower and an oil pump. Simulation results showed good predictions of the static and the dynamic behavior of a main transformer cooling system. Therefore, mathematical models developed in this study may be effectively used for the development of control algorithms of a main transformer cooling system.
Dynamic Simulation of Transient Operations of a Solar Power-Assisted Absorption Chiller
Shin, Young-Gy ; Seo, Jung-A ; Woo, Sung-Min ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 22, issue 2, 2010, Pages 78~85
A dynamic model has been developed to investigate the operability of a single and double-effect solar energy assisted parallel type absorption chiller. In the study, main components and fluid transport mechanism were modeled. And solar radiation and the solar collector were also modeled along with its control design. The model was run for the single mode with solar energy supply only and the solar/gas driving double effect mode. From the simulation results, it was found that the present configuration of the chiller is not capable of regulating solution flow rates according to variable solar energy input. And the issues of the excessive circulation flow rate and the mismatch between available solar power and cooling load discourages the use of the single mode, but the dual use of gas and solar power is recommendable in view of controllability and enhanced COP.
Reducing Peak Cooling Demand Using Building Precooling and Modified Linear Rise of Indoor Space Temperature
Lee, Kyoung-Ho ; Yang, Seung-Kwon ; Han, Seung-Ho ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 22, issue 2, 2010, Pages 86~96
The paper describes development and evaluation of a simple method for determining gradient of modified linear setpoint variation to reduce peak electrical cooling demand in buildings using building precooling and setpoint adjustment. The method is an approximated approach for minimizing electrical cooling demand during occupied period in buildings and involves modified linear adjustment of cooling setpoint temperature between
. The gradient of linear variation or final time of linear increase is determined based on the cooling load shape in conventional cooling control having a constant setpoint temperature. The potential to reduce peak cooling demand using the simple method was evaluated through building simulation for a calibrated office building model considering four different weather conditions. The simple method showed about 30% and 20% in terms of reducing peak cooling demand and chiller power consumption, respectively, compared to the conventional control.
Gas Pulsation Analysis of Large Reciprocating Compressors in Parallel Operation
Kim, Seong-Jun ; Kim, Hyun-Jae ; Kim, Hyun-Jin ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 22, issue 2, 2010, Pages 97~103
For large reciprocating compressors in parallel operation, an analytical study has been carried out on the gas pulsation in associated discharge piping lines. Since the pressure pulsation at a valve, valve dynamics, and the gas flow rate through the valve are interrelated, affecting one another, these need to be solved simultaneously. Acoustic transfer matrix method, which relates acoustic pressure and velocity at one location to those at another location, has been adopted to calculate the effect of the gas flow at one valve location on the gas pulsation at other valve locations.
A Study on the Material and Resource of Education Facilities in Green Building Certification Criteria
Kwag, Moon-Geun ; Choi, Chang-Ho ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 22, issue 2, 2010, Pages 104~111
To promote environmentally responsible architectural practice, many nations have established their own Green Building Certification system. Until 2007, 138 Education facilities acquired certification but many people don't fully understand each item of Green building Certification Criteria yet. The purpose of this study is to analyze 40 certified Education facilities and to find the reasons why they had acquired low scores and high scores. These scores lead us to propose a way that each contents the efficient approaches and alternative visions of Education facilities. Because the part of material and resource is initial of the projects, this study focuses on it and aims to pick out the items requiring improvement for the Education facilities. We expect to be helpful for the next design works through result of this thorough study.
A Study on the Ecology of Education Facilities in Green Building Certification Criteria
Kwon, Young-Cheol ; Choi, Chang-Ho ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 22, issue 2, 2010, Pages 112~121
With the global climate changes, a global concerns on building energy uses and
emission to improve the environment friendly has been increasingly growing. To achieve this global goal, the Korea government has been seeking an environment-friendly and sustainable development. As the results, the government started Green Building Certification Criteria system. however the certificate system has still been at the basic stage. To upgrade and advance it's level, it's necessary to identify the current status. This study aims to pick out the items requiring improvement for the Ecology of Education Facilities. We expect that the results of this study will be helpful for the next design works of certificate system.