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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 :
Volume & Issues
Volume 24, Issue 12 - Dec 2012
Volume 24, Issue 11 - Nov 2012
Volume 24, Issue 10 - Oct 2012
Volume 24, Issue 9 - Sep 2012
Volume 24, Issue 8 - Aug 2012
Volume 24, Issue 7 - Jul 2012
Volume 24, Issue 6 - Jun 2012
Volume 24, Issue 5 - May 2012
Volume 24, Issue 4 - Apr 2012
Volume 24, Issue 3 - Mar 2012
Volume 24, Issue 2 - Feb 2012
Volume 24, Issue 1 - Jan 2012
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Study on the Performance of an ATES Geothermal Heat Pump System and Economic Analysis
Oh, Myung-Suk ; Choi, Jong-Min ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 24, issue 4, 2012, Pages 289~296
DOI : 10.6110/KJACR.2012.24.4.289
The aim of this study is to investigate the performance of a heating and cooling system with aquifer thermal energy storage(ATES heat pump system) known as one of the underground thermal energy storage application systems. The ATES system was composed of heat pump unit and ATES, which was installed in a factory building located in Anseoung. The system represented very high heating and cooling performance, and showed nearly constant COP at each heating and cooling season due to the stability of EWT. The economic analysis about an ATES system and a conventional system was also executed. The conventional system adopted an air-conditioner in the summer season and a LNG boiler in the winter season. The payback period of the ATES system was estimated by 6.62 years.
An Experimental Study on Energy Consumption of Air Washer Outdoor Air Conditioning Systems for Semiconductor Manufacturing Clean Rooms
Kim, Ki-Cheol ; Kim, Hyung-Tae ; Song, Gen-Soo ; Yoo, Kyung-Hoon ; Son, Seung-Woo ; Shin, Dae-Kun ; Park, Dug-Jun ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 24, issue 4, 2012, Pages 297~305
DOI : 10.6110/KJACR.2012.24.4.297
In recent large-scale semiconductor manufacturing clean rooms, the energy consumption of outdoor air conditioning systems to heat, humidify, cool and dehumidify incoming outdoor air represents about 45% of the total air conditioning load required to maintain a clean room environment. Therefore, the energy performance evaluation and analysis of outdoor air conditioning systems is useful for reducing the outdoor air conditioning load for a clean room. In the present study, an experiment was conducted to compare the energy consumption of outdoor air conditioning systems with a simple air washer, an exhaust air heat recovery type air washer and a DCC return water heat recovery type air washer. It was shown from the present lab-scale experiment with an outdoor air flow of 1,000
that the exhaust air heat recovery type and DCC return water heat recovery type air washer outdoor air conditioning systems were more energy-efficient for the summer and winter operations than the simple air washer outdoor air conditioning system and furthermore, the DCC return water heat recovery type one was the most energy-efficient in the winter operation.
Development of an Electric Circuit Transient Analogy Model in a Vertical Closed Loop Ground Heat Exchanger
Kim, Won-Uk ; Park, Hong-Hee ; Kim, Yong-Chan ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 24, issue 4, 2012, Pages 306~314
DOI : 10.6110/KJACR.2012.24.4.306
Several numerical or analytical models have been proposed to analyze the thermal response of vertical ground heat exchangers (GHEX). However, most models are valid only after several hours of operation since they neglect the heat capacity of the borehole. Recently, the short time response of the GHEX became important in system simulation to improve efficiency. In this paper, a simple new method to evaluate the short time response of the GHEX by using an analogy model of electric circuit transient analysis was presented. The new transient heat exchanger model adopting the concept of thermal capacitance of the borehole as well as the steady-state thermal resistance showed the transient thermal resistance of the borehole. The model was validated by in-situ thermal response test and then compared with the DST model of the TRNSYS program.
Development of the TRNSYS Simulation Modules for System Air-Conditioner and Its' Verification
Ki, Hyun-Seung ; Hong, In-Pyo ; Park, Jun-Won ; Kang, Ki-Nam ; Song, Doo-Sam ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 24, issue 4, 2012, Pages 315~322
DOI : 10.6110/KJACR.2012.24.4.315
In these days, importance of HVAC system in office building is steadily growing in terms of thermal comfort and energy savings. As a energy efficient heating and cooling system, system air-conditioner which can be controlled distinctly and has a high COP is more widely adopted nowadays. However, the features and advantages of system air-conditioner were not reported well because system air-conditioner did not describe yet by conventional simulation methods such as TRNSYS, e-Quest, Energyplus, etc. In this study, by using the TRNSYS program which is able to show module implementation and building energy consumption analysis, system air-conditioner module will be proposed and validated through comparison between the simulation results and measurement results.
Analysis on Surface Temperature Control of an Insulated Vertical Wall Under Thermal Radiation Environment
Kang, Byung-Ha ; Pi, Chang-Hun ; Kim, Suk-Hyun ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 24, issue 4, 2012, Pages 323~329
DOI : 10.6110/KJACR.2012.24.4.323
In this study, a rational procedures for estimation of insulation thickness of a vertical wall for condensation control or personnel protection has been investigated. Design parameters are height of the wall, thermal conductivity, emissivity, and operating temperatures. The results indicated that the surface emissivity plays a very important role in the design of insulation for the purpose of surface temperature control, especially in natural convection situation. radiation heat transfer coefficients for some new insulation material surface, such as elastomers, estimated to be more than 90% of the total surface heat transfer coefficient.
A Study on Control Method of Thermal Storage Tank for Varying Thermal Load in Heat Pump Water Heater
Nam, Hyun-Kyu ; Bai, Cheol-Ho ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 24, issue 4, 2012, Pages 330~335
DOI : 10.6110/KJACR.2012.24.4.330
A characteristic behavior of the thermal storage tank for varying thermal load in heat pump water heater was studied. The control method was suggested and applied. By measuring the temperature within the storage tank, the heat pump was ON/OFF controlled. The appropriate measuring position and the size of heat exchanger gives the minimized power consumption of heat pump. As the length of heat exchanger increases, the temperature measuring position goes down of the storage tank and the power consumption increases.
Enhancement of Stratification for Solar Water Storage Tank with Spiral Jacket and Coil(Part 1：Verification Experiment)
Kwon, Jae-Wook ; Hong, Hi-Ki ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 24, issue 4, 2012, Pages 336~342
DOI : 10.6110/KJACR.2012.24.4.336
Large-scale active solar heat systems are generally using heat exchanger between collector and storage tank loops to prevent damage by freezing. It is difficult to maintain stratification in a storage tank in the system owing to greater flow rate enhancing heat transfer. In the previous study, we introduced a spiral-jacketed storage tank and obtained good results to keep system performance of general level without better stratification. We added a scroll-shaped heat exchanger coil on the upper part in the spiral-jacketed storage tank. As a result of the experiment, it was verified that degree of stratification of the new type storage tank is higher than that of the previous one with a possibility of better collector efficiency and solar fraction.
An Analysis of the Energy Saving Effect Through the Retrofit and the Optimal Operation for HVAC Systems
Kim, Yong-Ki ; Lee, Tae-Won ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 24, issue 4, 2012, Pages 343~350
DOI : 10.6110/KJACR.2012.24.4.343
The major goal of building energy management is to minimize the energy consumption while maintaining the comfortable environment condition. Nowadays building energy management to save HVAC energy and so on is the most critical issue for existing building service branch with high efficiency equipments and their optimal operation. The effects on the building energy savings of the building equipment retrofit and the improvement of its operation method, especially in the field of HVAC system, were analyzed in this study for domestic small and/or medium sized buildings. Over 8.8% of energy saving was achieved compared withe total energy consumption in commercial building. These results could be used for reasonable maintenance and efficient management of the various building service equipments and related systems.
Performance Analysis of Summertime Heat Transfer Characteristics of the Double Skin Window for Plant Factory
So, Jae-Hyun ; Kim, Woo-Tae ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 24, issue 4, 2012, Pages 351~357
DOI : 10.6110/KJACR.2012.24.4.351
To reduce the summertime cooling load of a plant factory, a concept design was performed for the double skin window which utilizes the low temperature air from a ground coupled heat exchanger. The design parameters were selected as the number of cavity air inlet, the cavity thickness, the location of cavity air inlet, and the configuration of cavity air outlet. A parametric study was conducted in a systematic way to evaluate the heat transfer characteristics of the double skin window. As the number of cavity air inlet and the cavity thickness increase, the heat flux from outside air to indoor air was decreased. The effect of the location of cavity air inlet was not significant and the larger cavity air outlet area gave us relatively better heat blocking performance from outside hot air. This study demonstrated that it is possible to develop an improved double skin window by utilizing a ground coupled heat exchanger.
A Study on the Availability with Failure Rate of Process for LNG Plant
Kang, Kyung-Won ; Yoon, Myung-O ; Lee, Hong-Cheol ; Hwang, In-Ju ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 24, issue 4, 2012, Pages 358~363
DOI : 10.6110/KJACR.2012.24.4.358
The simulation investigation on the availability of LNG plant with scenario of failure events and failure rate has been carried out. This study focuses on the availability, productivity, criticality induced by failure rate of major equipment. The methodologies for simulation such as the equipment classification of LNG plant and failure type and event schematic are established. The availability and mean time to repair have second order function profile in the all cases except general equipment, but these profiles have different inclination. The production and criticality of the specified LNG plant, simulated by Monte-Carlo algorithm, is located in the range of P = 86~92% and PL = 6~13%.
Influence of Interior Design Elements on Spatial Satisfaction and Preference for Coffeeshop Space
Choi, You-Jin ; Lee, Ji-Hyun ; Kim, Soo-Young ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 24, issue 4, 2012, Pages 364~375
DOI : 10.6110/KJACR.2012.24.4.364
This study investigates the effects of interior design elements on the satisfaction and preference for space. Field measurements and surveys were conducted in three coffeeshops where various interior design elements were applied. Results indicate that movable tables and chairs for two people were preferred in the space. They need to be placed flexibly according to the visitors' needs to improve satisfaction for convenience. To improve spatial satisfaction, the brightness of color applied to wall surfaces was recommended to be lower than that of color used for floor surfaces. The surfaces of space and interior design elements such as furniture also need to be kept clean. Lamps with lower color temperature were effective to enhance spatial satisfaction. Light sources should be shielded when a pendant lighting system with general diffuse type was used in space. Natural daylight through window was also required for better satisfaction level. Multiple linear regression implied that the cozy feeling by electric light, existence of daylight, flexible layouts for tables and chairs, color and quality of material for tables and floor were significant contributors to overall spatial satisfaction.