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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the KSME C: Industrial Technology and Innovation
Journal Basic Information
Journal DOI :
The Korean Society of Mechanical Engineers
Editor in Chief :
Volume & Issues
Volume 3, Issue 4 - Dec 2015
Volume 3, Issue 3 - Sep 2015
Volume 3, Issue 2 - Jun 2015
Volume 3, Issue 1 - Mar 2015
Selecting the target year
A New Dynamic VRF Heat Hump Simulation Including Frosting and Defrosting Models
Park, Noma ; Shin, Jeong Seob ; Chung, Baik Young ; Kim, Byung Soon ;
Transactions of the KSME C: Industrial Technology and Innovation, volume 3, issue 1, 2015, Pages 1~13
DOI : 10.3795/KSME-C.2015.3.1.001
In this study, a new dynamic VRF-type heat pump simulation model is proposed which incorporates frosting and defrosting models. Toward this end, a simple frosting model based on the perfect analogy, and lumped system based defrost model, are proposed. Then, frosting and defrosting models are incorporated into a dynamic heat pump model which adopts segment-by-segment local heat exchanger model and map-based variable speed compressor model. Thus, the model can naturally represent locally uneven frosting and defrosting on the heat exchanger surface. Developed simulation model is validated against available experimental data to show good agreement within 10% error for capacity and COP. Finally, developed dynamic heat pump model is applied to annual heating season simulation to show that seasonal COP of heat pump is degraded by 7% due to frosting and defrosting.
Prediction of GHP Performance Using Cycle Analysis
Cha, Woo Ho ; Choi, Song ; Chung, Baik Young ; Kim, Byung Soon ; Jeon, Si Moon ;
Transactions of the KSME C: Industrial Technology and Innovation, volume 3, issue 1, 2015, Pages 15~21
DOI : 10.3795/KSME-C.2015.3.1.015
In this paper a prediction method of GHP performance is proposed for increasing design accuracy. Two compressors with different capacity and 2311cc gas engine are used for prediction and the target capacity of GHP is 25HP. For predicting GHP performance at first the operation points are randomly selected and then as compared with compressor performance date and heat exchanger characteristic, more accurate operating points are decided through recursive calculation. Lastly engine performance date is used for calculating gas consumption volume. Predicting heating mode performance of GHP, evaporator is separated to the two section of absorbing heat in outdoor air and in engine. From the experimental results, it was found that the simulation model is good for the predicting GHP efficiency and the difference of predicted and measured efficiency is less than 5%.
Design Optimization of Dual-Shell and Tube Heat Exchanger for Exhaust Waste Heat Recovery of Gas Heat Pump
Lee, Jin Woo ; Shin, Kwang Ho ; Choi, Song ; Chung, Baik Young ; Kim, Byung Soon ;
Transactions of the KSME C: Industrial Technology and Innovation, volume 3, issue 1, 2015, Pages 23~28
DOI : 10.3795/KSME-C.2015.3.1.023
In this paper, we performed the design optimization dual-shell and tube heat exchanger on exhaust waste heat recovery for gas heat pump using CFD and RSM. CFD analysis is useful to design the complex structure such as double shell and tube heat exchanger. By computer simulation, engineers can assess the feasibility of the given design factors and change them to get a better design. But if one wishes to perform complex analysis on the simulation, such dual-shell and tube heat exchanger for GHP, the computational time can become overwhelming. CFD is powerful but it takes a lot of time for complex structure. Therefore, the CFD analysis is minimized by the optimization using the RSM method. As a result, the number of baffle and tube are optimized by 6 baffles and 25 tubes for heat transfer and flow friction. And then pressure drop and heat transfer is improved about 12.2%. We confirm the design optimization using CFD and RSM is useful on complex structure of heat exchanger.
A Study on the Training of Maritime Cadets of Increasing High Voltage Ships
Im, Myeong Hwan ; Sin, Ho-Sig ;
Transactions of the KSME C: Industrial Technology and Innovation, volume 3, issue 1, 2015, Pages 29~36
DOI : 10.3795/KSME-C.2015.3.1.029
Some major companies representing Korea's ship building actively take part in building Oil & Gas offshore which produces both oil and gas from the ocean. Merchant ships become enlarge and high-powered electric as well as increasing number of Oil & Gas offshore. Thus, maritime university cadets are pushed to participate in onboard training on 440V to 6,660V high voltage ships. Although they have difficulty and danger from onboard training course on high voltage ships, their curriculum is still focusing on the training on low voltage ships. Therefore, this study is to suggest the upcoming education measures based on the questionnaire survey and analysis from the Maritime cadets who had experienced in high voltage ships.
Finite Element Analysis of Dynamic Deformation of Refrigerator's Lower Hinge during Drop Test
Hong, Seokmoo ; Choi, Yong Chan ; Eom, Seong-Uk ; Kim, Hong Lae ; Hyun, Hong Chul ;
Transactions of the KSME C: Industrial Technology and Innovation, volume 3, issue 1, 2015, Pages 37~44
DOI : 10.3795/KSME-C.2015.3.1.037
In this paper dynamic deformation of lower hinge of refrigerator is simulated using dynamic finite element analysis while refrigerator is being dropped. The flow stress curves considering velocity dependency of hinge and lower packing material are determined through bending test and compression test at several dropping speeds. The determined material properties and flow stress from reverse engineering were used as input data for refrigerator's drop test using a dynamic finite element analysis software LS-DYNA. Additionally the result between CAE and 3D deformation measurement from real refrigerator drop test are compared and the result shows that the proposed analysis model is very useful to design lower hinge and lower packing endurable to the impulsive drop impact.
Experimental Investigation of Flow Assurance due to Heating Method in Offshore Pipeline
Sohn, Sangho ; Park, Jaebum ; Lee, Jungho ;
Transactions of the KSME C: Industrial Technology and Innovation, volume 3, issue 1, 2015, Pages 45~53
DOI : 10.3795/KSME-C.2015.3.1.045
The fact that gas hydrate and/or paraffin wax is frequently plugged in offshore pipeline has been become very significant for offshore piepline flow assurance. An active electrical heating along pipeline has adapted in resolving flow assurance problem like as gas hydrate and wax plugging. This study represents a novel internal-swirled heater which was designed and fabricated for more effective heating and thermal mixing through pipeline. The internal-swirled heater suggested in this study shows higher thermal mixing performances than the conventional external-traced heater.
Performance Analysis of Direct Expansion and Organic Rankine Cycle for a LNG Cold Power Generation System
Cho, Eun-Bi ; Jeong, Moon ; Hwang, In-Ju ; Kang, Choon-Hyoung ;
Transactions of the KSME C: Industrial Technology and Innovation, volume 3, issue 1, 2015, Pages 55~62
DOI : 10.3795/KSME-C.2015.3.1.055
The liquefaction to produce LNG (liquefied natural gas) is the only practical way for mass transportation of natural gas across oceans, which accompanies considerable energy consumption in LNG plants. Power generation is one of the effective utilization ways of LNG cold energy which evolves during the vaporization process of LNG with sea water. In this work, performance analysis of two cold energy generation processes, direct expansion and organic Rankine cycles, were carried out by using Aspen HYSYS simulation. The results show that the performance of the organic Rankine cycle is superior to the direct expansion.
Section Analysis of EMS Rail by Finite Element Analysis
Yu, Byoung Kwon ;
Transactions of the KSME C: Industrial Technology and Innovation, volume 3, issue 1, 2015, Pages 63~69
DOI : 10.3795/KSME-C.2015.3.1.063
Among the material handling system, EMS (Electric Monorail System), which is the facility of transferring the material hanging on truss, has the strength point of the maximum utilization of working space and the improvement of working environment including low-level noise generation. This paper will introduce the variable method of EMS rail analysis, which has the main role of supporting the whole material weight and guiding them with high-speed transportation, and, based on the analysis, the direction of optimization of the rail design be described. The rail with light-weight and high-strength contributes the reduction of the load of truss, the cost-down of rail production and the easy-installation on site.
A Study on Certification Requirements for Small Unmanned Aerial System(sUAS)
Ahn, Hyojung ; Park, Jonghyuk ;
Transactions of the KSME C: Industrial Technology and Innovation, volume 3, issue 1, 2015, Pages 71~78
DOI : 10.3795/KSME-C.2015.3.1.071
Although there are differences in the classification of category adopted by each country, small UAS is usually classified as the one less than 25 kg. UAS has been mainly used for military and public purposes, but in recent years, it has spread to the private sector for hobby, media, and so on. Especially, considering the nature of the operating region and applications, it is necessary to improve operating time, noise and vibration in small UAS to ensure the same level of safety with a manned aircraft. This is because the drone can pose health and safety hazard through collision with manned aircraft or crashing into the ground. In this paper, we investigated operational regulations in the United States and European countries. Based on the investigation, a domestic system development plan for small UAS operation is under development.