• Proceedings of the KSME Conference
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• 2008.11b
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• pp.2262-2267
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• 2008

In this paper, drying mechanism is analyzed for improving the energy efficiency of an electric clothes dryer which consumes more electric power than other appliances. For the purpose, characteristic curves of the dryer such as temperature, relative humidity, evaporation rate, mass transfer coefficient, remaining moisture content curves are experimentally obtained. Based on the experimental results and analysis of drying mechanism, the effect of power of a heater and heat loss on the power consumption of an electric clothes dryer are systematically presented. These results demonstrate the feasibility of controlling heat loss at the heater as well as backduct component to decrease the power consumption of an electric clothes dryer.

• Archives of design research
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• v.6 no.1
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• pp.47-72
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• 1993

Nowadays conmpetltlOn of developing new products is getting keen. We can notice that the role and importance of design are emphasized more than ever.The main cause of this tendency is that technical power is no more a factor which secures the superiority in products competition, as technology is gneneralized in the world. Therefore, design is recognized intensely as a competitive strategy to promote competitive power of products. It is an already known fact that the design for both rational function and charming form to satisfy consumer's desires is a short cut to success, when a company develops a new product to promote competitive power in market. The design which plays a leading role in the activity of developing more cnovenient, more economical and more aesthetic products is called 'Competitive Edge' or 'New Corporate Weapon'. Judging form each company's case of developing products, we can guess that it has its own plan and process of developing new products with defferdnl interest and effort. The strategy of developing products is considered as the most important factor that affects the very existence of rhe company. This thesis is composed of six chapters in all. In the firstchapter, I describe the purpose, method, and scope of study.The second chapter includes the image of form in oil fan heater market in nearby Japan and that of interior in our domestic home and shops, and the trend of word life cycle by analyzing circumstances. The third chapter focuses on consumer's attitude. In the fourth chapter, I compare and test current products of competitive companies including Samsung, Daewoo, Shinilwith those of Gold STar. The trend of products, technique, and design which resulted form this comparison is described. In the fifth chapter I explain the strategy, and process of design of oil fan heater in 1992. The last conclusive chapter presents the major point drawed form the case study, but not includes an estimation of products and the condition of market. In this thesis, I reconsider the general understanding of design and designing process and the value of design as a main factor in the strategy of management by investigating the development of products and the strategy of design, and the process of design.

• Plant Journal
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• v.14 no.2
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• pp.39-44
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• 2018

In this study, I analyzed the effects on stabilizing the draft system, boiler efficiency when changing excess air ratio under 870 MW load limit operation condition in a large capacity coal fired power plant and decided optimum excess air ratio. It is positively necessary to choose adequate excess air ratio for stabilizing draft system because air pre-heater pressure drop and induced draft fan first stall margin are changing when adjusting excess air ratio. This study therefore, measured air pre-heater pressure drop, induced draft fan first stall margin, boiler efficiency, loss and has chosen adequate excess air ratio adjusting excess air ratio from 1.153 to 1.127. So it is recommended that the operation point needs to be changed to 1.127 that is not only to decrease air pre-heater pressure drop and to stabilize draft system and to secure stall margin but also to maintain boiler efficiency to equivalent level.

• Proceedings of the KSME Conference
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• 2007.05b
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• pp.2309-2314
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• 2007

The application analysis of bubble pump on the domestic solar water heater system is presented. The system investigated in this study is a passive device, self pumping and self regulating. It was test to use the bubble pump on solar water heater system. The test experiment has been taken on the existed vacuum tube about the efficiency, working fluid temperature and pressure and circulated power. In order to check the working temperature and working pressure effectively, the bubble pump was test separated from the solar water heater. The equipment consists of the bubble pump, heater and heat exchanger. The main structure of bubble pump was design depend on the character of two phase flow. The complete system was instrumented to measure pressures, temperatures and flow-rates at various locations. The theory analysis of design bubble pump has been given and the experiment design has been included in the paper.

• Journal of IKEEE
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• v.18 no.2
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• pp.185-191
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• 2014

In this paper, we have implemented the low temperature fluidity test system with the composited package fuel heater, which has tested the low temperature fluidity and start time to evaluate the performance. Then we have compared the separation and the unified fuel heater type at $+20{\sim}-30^{\circ}C$. Also, we have tested the flowing pressure and start time, power consumption of heater. By comparing the performance with several condition, the experimental results obtain an improved start time of 23% and low temperature fluidity of 19%.

• Proceedings of the SAREK Conference
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• 2007.11a
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• pp.416-422
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• 2007

The application analysis of bubble pump on the domestic solar water heater system is presented. The system investigated in this study is a passive device, self pumping and self regulating. It was test to use the bubble pump on solar water heater system. The test experiment has been taken on the existed vacuum tube about the efficiency, working fluid temperature and pressure and circulated power. In order to check the working temperature and working pressure effectively, the bubble pump was test separated from the solar water heater. The equipment consists of the bubble pump, heater and heat exchanger. The main structure of bubble pump was design depend on the character of two phase flow. The complete system was instrumented to measure pressures, temperatures and their relationship with the solar radiation intensity. The theory analysis of design bubble pump has been given and the experiment result analysis has been included in the paper.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1997.11a
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• pp.331-334
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• 1997

The electrical and physical charateristics of aluminum oxide and Pt thin films on it, deposited by reactive sputtering and DC magnetron sputtering, respectively, were analysed with increasing annealing temperature(400~80$0^{\circ}C$) by four point probe, SEM and XRD. Under $600^{\circ}C$ of annealing temperature, aluminum oxide had the properties of improving Pt adhesion to SiO$_2$and insulation without chemical reaction to Pt thin films and the resistivity of Pt thin finns was improved. But these properties of aluminum oxide and Pt thin finns on it were degraded over $700^{\circ}C$ of annealing temperature because aluminum oxide was changed into metal aluminum and then reacted to Pt thin films deposited on it. The thermal characteristics of Pt micro heater were analysed with Pt-RTD integrated on the same substrate. In the analysis of properties of Pt micro heater. active area was smaller size, Pt micro heater had better thermal characteristics. Temperature of Pt micro heater fabricated on membrane was up to 34$0^{\circ}C$ with 1.2watts of the heating power due to reduction of the external thermal loss.

• Journal of IKEEE
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• v.18 no.1
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• pp.152-158
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• 2014

It is very important to supply the diesel fuel from fuel tank to combustion chamber in case of cold start procedure. the paraffin hydrocarbons are easily solidified at low fuel temperature and it can be blocking the fuel supply to the high pressure fuel pump. In order to reduce the fuel crystallization (Waxing), it have been used to develop not only cold flow additives but also the proper mounting design of fuel filter. Block heater in the fuel filter assembly have been also contained to improve the cold start and prevent blocking the fuel supply in Common Rail Direct Injection System. we can obtain the fuel pressure drop and fuel flow rate, power consumption of fuel heater to have the cold flow evaluation test with the saperated and composited fuel heater at the low ambient temperature, Due to evaluating cold flow performance of two block heater, we knew that composited package fuel heater was the excellent cold flow performance compared to separated type and obtained the parameters of cold flow.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.22 no.11
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• pp.15-22
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• 2008

This paper presents an innovative prototype of a new conceptual electromagnetic induction heated type far infrared rays radiant heating appliance using the voltage-fed quasi-resonant ZVS-PWM high frequency inverter using IGBTs for food cooking and processing which operates under a constant frequency variable power regulation scheme. This power electronic appliance with soft switching high frequency inverter using IGBTs has attracted special interest from some advantageous view points of safety, cleanliness, compactness and rapid temperature response, which is more suitable for consumer power electronics applications.

• 한국신재생에너지학회:학술대회논문집
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• 2007.06a
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• pp.672-675
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• 2007

Experimental data are presented which describe heat losses of cavity type receiver in wind tunnel. Experiments are conducted at various conditions such as the heater temperature in cavity changes from 300, 400, and 500 oC, wind speed in tunnel from 2 to 8 m/s, and four different tilt angle of 30, 50, 70, 90o. The power consumption including temperature, voltage and current for each experimental conditions are measured and stored in data logger at everyone second interval. The experimental results show that heat losses increase with increasing wind speed and with tilt angle. However, heat losses for the tilt angle of 70 and 90o is almost same at each heater temperature. In addition, the effects of natural convection in combined convection heat losses vary in according to the tilt angle.