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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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 4, Issue 1 - Mar 2016
Selecting the target year
Analysis Study of Seasonal Performance Factor for Residential Building Integrated Heat Pump System
Kang, Eun-Chul ; Min, Kyoung-Chon ; Lee, Kwang-Seob ; Lee, Euy-Joon ;
Transactions of the KSME C: Industrial Technology and Innovation, volume 4, issue 1, 2016, Pages 3~10
DOI : 10.3795/KSME-C.2016.4.1.003
Heat pump unit performance is represented by the COP(Coefficient of Performance) and expressed by the one point design condition according to KS C 9306. However, when heat pump operated to the real buildings, the simulations are changed continuously according to the actual weather conditions, the building load and heat pump source conditions. The purpose of this paper is to evaluate the APF(Annual performance factor) for a climate dependent building integrated air-to-air heat pump system in major cities in Korea. TRNSYS simulation tool with an international MV standard based IPMVP 4.4.2 was utilized to perform the annual performance analysis. The APF with the multi-performance data based method was calculated as 2.29 for Daejeon residential building case while Busan residential building case appeared as the highest with 2.36.
Identifying, Prioritizing, Measuring and Verifying Clean Energy Solutions for Korea`s Public Building Renewable Energy Obligation Policy
Lee, Kwang Seob ; Kang, Eun Chul ; DA CUNHA, Ivor Francis ; Lin, Cheng-Xian ; Lee, Euy Joon ;
Transactions of the KSME C: Industrial Technology and Innovation, volume 4, issue 1, 2016, Pages 11~18
DOI : 10.3795/KSME-C.2016.4.1.011
Under the Renewable Heat Obligation (RHO) public buildings in the Republic of Korea larger than
must achieve an 11% overall reduction to thermal energy consumption. Well intended solutions have been proposed. However, not all option is evaluated on the same basis, potentially resulting in incomplete or sub-optimal solutions. What`s more once projects are implemented, there are inconsistencies in the methods used to measure and evaluate operating performance of the post-retrofit case. The RETScreen decision tools and methodology can be used by decision makers, policy developers, architects, engineers and community leaders to evaluate and select the most effective solutions for Korea`s RHO needs.
Performance Analysis of Cooling Tower-Assisted Hybrid Ground-Coupled Heat Pump (HGCHP) System
Sohn, Byonghu ; Lee, Doo-Young ; Choi, Jae-Ho ; Min, Kyong-Chon ;
Transactions of the KSME C: Industrial Technology and Innovation, volume 4, issue 1, 2016, Pages 19~26
DOI : 10.3795/KSME-C.2016.4.1.019
This paper presents the measurement and analysis results for the performance of HGCHP system using a cooling tower as a supplemental heat rejector. In order to demonstrate the performance of the hybrid approach, we installed the monitoring equipments including sensors for measuring temperature and power consumption, and measured operation parameters from February 1, 2014 to February 28, 2015. Leaving load temperatures to building showed an average value of
for cooling and
for heating, respectively. From the analysis, the daily PF of hybrid GCHP system varied from 2.6 to 6.6 over the measurement period.
Data Mining-Based Performance Prediction Technology of Geothermal Heat Pump System
Hwang, Min Hye ; Park, Myung Kyu ; Jun, In Ki ; Sohn, Byonghu ;
Transactions of the KSME C: Industrial Technology and Innovation, volume 4, issue 1, 2016, Pages 27~34
DOI : 10.3795/KSME-C.2016.4.1.027
This preliminary study investigated data mining-based methods to assess and predict the performance of geothermal heat pump(GHP) system. Data mining is a key process of the knowledge discovery in database (KDD), which includes five steps: 1) Selection; 2) Pre-processing; 3) Transformation; 4) Analysis(data mining); and 5) Interpretation/Evaluation. We used two analysis models, categorical and numerical decision tree models to ascertain the patterns of performance(COP) and electrical consumption of the GHP system. Prior to applying the decision tree models, we statistically analyzed measurement database to determine the effect of sampling intervals on the system performance. Analysis results showed that 10-min sampling data for the performance analysis had highest accuracy of 97.7% over the actual dataset of the GHP system.
Performance Simulation of Geothermal Heat Pump (GHP) System with Different Control Schemes
Lee, Doo-Young ; Choi, Jae-Ho ; Min, Kyong-Chon ; Sohn, Byonghu ;
Transactions of the KSME C: Industrial Technology and Innovation, volume 4, issue 1, 2016, Pages 35~41
DOI : 10.3795/KSME-C.2016.4.1.035
Geothermal heat pump (GHP) systems have been proved to be one of the most efficient systems for heating and cooling in buildings. However, an optimal energy performance depends on a good control of the system components, including heat pumps and circulation pumps, which affect to the total energy consumption of system. This paper presents the simulation results of the heat pump performance for two different control schemes, i.e. constant setting temperature (Control-A) and variable setting temperatures (Control-B) in buffer tank. A dynamic simulation tool, TRNSYS 17, was used to model the entire system and to assess the performance of the system. Simulation results show that the Control-B, which controls the temperature in buffer tank with outdoor air temperature, is a effective way to reduce the energy consumptions in heat pump (7.7%) and circulation pump (7.5%).
A Study on Regional Distribution of the Ground Effective Thermal Conductivity
Kong, Hyoung Jin ; Kwon, Soon-Ki ; Ji, Seung Gyu ;
Transactions of the KSME C: Industrial Technology and Innovation, volume 4, issue 1, 2016, Pages 43~47
DOI : 10.3795/KSME-C.2016.4.1.043
Ground source heat pump(GSHP) systems is known as environmental friendly and energy saving. Especially a ground heat exchanger is an important unit that determines the thermal performance of a system and initial cost. In design phase of vertical GSHP system, it is recommended that the effective borehole thermal resistance, be determined from in-situ thermal response test. In this study, ground effective thermal conductivity was categorized by a region. As a result of the study, the ground thermal conductivity of national average was analyzed as 2.56 W/mK. The highest regional average of thermal conductivity is 2.68 W/mK in Seoul, and the lowest is 2.28 W/mK in Busan. Also, the thermal conductivity on the coast has been analyzed approximately 30% lower than the average.
Impact of Design Parameters on Length and Application Effect of Surface Water Heat Exchanger(SWHE)
Sohn, Byonghu ; Min, Kyong-Chon ;
Transactions of the KSME C: Industrial Technology and Innovation, volume 4, issue 1, 2016, Pages 49~56
DOI : 10.3795/KSME-C.2016.4.1.049
Commercial buildings are generally cooling-dominated and therefore reject more heat to a vertical ground heat exchanger(GHE) than they extract over the annual cycle. Shallow ponds can provide a cost-effective means to balance the thermal loads to the ground and to reduce the length of GHE. The objective of this work has been to develop a design tool for surface water heat exchanger(SWHE) submerged in shallow pond. This paper presents the analysis results of the impact of design parameters on the length of SWHE and its application effect on geothermal heat pump(GHP) system using vertical GHE. In order to analysis, We applied
method on designing the length of SWHE. Analysis results show that the required pipe length of SWHE was decreased with the increase of approach temperature difference and with the decrease of pipe wall thickness. In addition, when the SWHE was applied to the GHP system, the temperature of vertical GHE was more stable than that of standalone GHE system.
A Real-Time Demand Response Management Using Smart Box
Ko, Dong-Kwan ; Bea, Jun-Cheol ; Min, Kyoung-Chon ; Lee, Jae-Kyu ;
Transactions of the KSME C: Industrial Technology and Innovation, volume 4, issue 1, 2016, Pages 57~62
DOI : 10.3795/KSME-C.2016.4.1.057
The Demand Response Market is a nation-wide power and energy management program of electric power demand response operated by KPX (Korea Power eXchange). Therefore, any savings could be determined by KEPCO`s AMR(Automatic Meter Reading) data. However, the customers and the service providers participating in the market could not know the real time value due to the 15 minute or even more delayed AMR data communicated. Here, a new concept of a smart box has been introduced and demonstrated to provide the real time saving values compared to the current KEPCO`s AMR data approach.
Convenient and Economic Mechatronics Education Using Small Portable Electronic Devices
Kang, Chul-Goo ;
Transactions of the KSME C: Industrial Technology and Innovation, volume 4, issue 1, 2016, Pages 63~71
DOI : 10.3795/KSME-C.2016.4.1.063
Although mechatronics education in a mechanical engineering curriculum is recently recognized as important, its experimental education has been done generally in the laboratory equipped with all the apparatus and could not be done at home by students. This paper introduces experimental educations on mechatronics, e.g., digital logic circuits, 7-segment LED drive, square wave generation, microcontroller programming using assembly and C languages, timer interrupt, and step motor drive using a small 5 V power supply, a breadboard, various electronic and electric components, a microcontroller and its programmer, a step motor, and a student`s PC. In the developed mechatronics course, experimental educations are scheduled in parallel with content`s lectures together, and cheap and economic experimental environment is prepared for students in which students can easily practice experimental works in advance or later at home by themselves.