• 한국수소및신에너지학회논문집
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• 제24권5호
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• pp.444-450
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• 2013

The distribution performance of refrigerant distributors in air conditioner evaporators was examined numerically and experimentally. Internal flow analysis of the distributor by CFD found that the distance from the socket to the cone, the angle of the cone and the base area of the cone were the most important factors affecting refrigerant distribution ability and vortex creation. To enhance distribution performance, two distributors with improved internal structures were designed. To test these new structures, distribution performance was also analyzed by CFD and an empirical experiment was carried out using the water-nitrogen. Experimental results on the distribution fraction of each distributor hole showed a good agreement with the results of the CFD analysis. Thus, the new design of the distributors enhanced distribution performance of the refrigerant distributors.

• 디자인학연구
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• 제13권
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• pp.153-162
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• 1996

최근의 경제성장과 아울러 우리의 주거 공간이 보다 더 확장되어 가는 추세에 있다. 따라서 PAC (PACKAGE AIR CONDITIONER) 가 종래에는 주로 업소 설치용으로 판매되었으나 최근에는 하절기 상품으로써 생활수준의 향상과 함께 업소용에서 가정용으로 옮겨가는 상태에 있다고 볼 수 있다. PAC는 최근의 기후 온난화 현상에도 영향을 받아 날로 그 수요가 늘어나고 있으며 필수품 화되어 가는 추세에 있다. 본 연구는 국내에 대표적인 가전 업체인 (주)금성사에서 추진 개발되었던 PAC의 제품개발과 DESIGN PROCESS에 대한 사례 연구로서 기업에서의 제품개발과 디자인이 어떠한 연구와 과정을 통해 이루어지는가에 대해 고찰에 보았으며 이러한 연구과정을 토대로 조형화(가사 화) 시키는데 역점을 두었다. 예컨대 우선 하절기 상품인 만큼 기후에 따른 한국인의 체질과 그 특수성을 알아보았으며 고객 환경으로써 PAC의 표적고객을 설정하여 그 수요를 예측해 보았다. 고객 환경으로써 PAC의 표적고객을 설정하여 그 수요를 예측해 보았다. 그리고 PAC와 직접적인 관계가 있는 주거환경으로써 APT 거주지의 거실에서의 행위를 분석하였으며 아울러 거실의 전반적인 INTERIOR IMAGE를 분석하여 PAC의 조형화 작업에 일조를 하였다. 실질적인 조형화 작업에 있어서는 DESIGN CONCEPT을 고객환경, 주거환경, 제품 환경으로 나누어 다음과 같이 추진하였다. 첫째. 성 SPACE화로써 설치공간의 극소화 및 시각적 개방 감을 유도하는 NEW SHAPE(ROUND SLIM)을 구현하였고 둘째. INTERIOR화로써 거실의 분위기와 조화되는 제품의 고급 감을 표출하였다. 셋째. HIGH-TOUCH화로 사용자의 감성을 자극하는 SHAPE 및 표면 처리에 역점을 두었고 넷째로, HI-QUALITY화로써 전자제품에서 보여지는 TECHNOLOGY IMAGE의 과감한 도입적용을 시도하였다.

• 대한기계학회논문집A
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• 제30권2호
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• pp.202-209
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• 2006

As the economic power is improved and the customer's demand is hard to please, the noise and vibration is the most important yardstick that can determine the quality of the product. Especially, as the airconditioner's demand increase suddenly, the product of quality and the noise is becoming a decisive factor of determining whether purchase the product or not. Therefore, every manufactory is investing a lot of money and research to cut down the unpleasantness induced from noise and vibration. And they are emphasizing their product's difference by advertising a silence very actively. With these reason, the demand of a silent indoor air-conditioner is the essential research filed when the product is develop(:d. In this study, the noise and vibration is visualized in the space and frequency domain by using experimental methods such as operational deflection shape (ODS), modal testing and sound intensity. Also the location of noise source and its characteristic is analyzed in an acoustical point of view to reduce the structure borne noise that come from the fan motor, and the pertinent control method is suggested. Furthermore, the most suitable shape of the motor bracket is suggested by applying FEM and DOE (Design of experiments) in the noise and vibration point a view.

• 전력전자학회논문지
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• 제4권2호
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• pp.122-127
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• 1999

본 논문에서는 3마력의 컴프레샤 모터를 갖는 대용량의 인버터 에어컨의 원가절감과 성능향상을 위해서 병렬구동방식을 사용한 역률제어회로를 제안하였다. 역률개선 LC필터를 제거하고 출력캐패시터와 인버터 스위치의 정격축소를 통해서 재료비를 줄이기 위해서 적절한 설계절차를 제시하였다. 이렇게 결정된 소자를 사용하여 6[kW] 소지전력을 갖는 프로토형 회로를 구성하고 제안된 회로의 동작을 확인하기 위해서 실험을 하였다.

• 한국정밀공학회지
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• 제25권2호
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• pp.80-87
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• 2008

A lot of conventional automotive components driven by mechanical power source are being replaced with electrical ones to comply with the demands of market and customer, therefore the amount of electric energy used in a vehicle will be increased continuously. The increment of electric power demand causes interest on new higher power system such as 42V Power Net, and furthermore necessity for development of energy storage device is highlighted recently. This paper present the design of the BLDC motor for electric air-conditioner in 42V system and compare with the characteristics of several type BLDC motor.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 1998년도 춘계학술대회논문집; 용평리조트 타워콘도, 21-22 May 1998
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• pp.575-581
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• 1998

The noise sources in the outdoor unit of RAC(Room Air Conditioner) are identified by the sound intensity method. The main noise sources are compressor noise and fluid noise which is caused by the fan, heat exchanger and shroud. First, the fluid noise is reduced through the design ol new fan and shroud with high flow rate and low noise, reduction of the system resistance by rearrangement of heat exchanger, and optimization of the complex parameter between the fan and shroud. Next, in order to reduce the compressor noise, the new shape of compressor mount and sound-proof material was applied. As a result, the overall noise was reduced by 4-5dB(A).

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 F
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• pp.2662-2664
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• 1999

To improve the current waveform of diode rectifiers, we propose a new operating principle for the voltage diode rectifiers. In the conventional voltage rectifier circuit, relatively large capacitors are used to boost the output voltage, while the proposed circuit uses smaller ones and a small reactor not to boost the output voltage but improve the input current waveform. A circuit design method is shown and confirmed simulation. It explained that compared conventional SPWM inverter with HPWM(Half Pulse-width modulated)Inverter. Proposed HPWM inverter eliminated dead-time by lowering switching loss and holding over-shooting. Output voltage and current of this paper were applied for real air-conditioner.

• 동력기계공학회지
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• 제17권1호
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• pp.58-63
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• 2013

The aerodynamic performance of double inlet sirocco fan is strongly dependent upon the design factors of impeller and scroll. In this paper, the change of scroll size was adopted to investigate the aerodynamic performances of double inlet sirocco fan and indoor PAC. Especially, a scroll expansion angle and a cut-off clearance ratio were considered to change the scroll size. In addition, the installation depth between double inlet sirocco fan and indoor PAC was considered. As a result, the total pressure efficiency of double inlet sirocco fan shows about 62%~73% according to the change of scroll expansion angles. Moreover, the flowrate performance of indoor PAC is the best at the condition of a scroll expansion angle of 8°, an installation depth of 15 mm and a cut-off clearance ratio of 8%.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 Proceedings ICPE 98 1998 International Conference on Power Electronics
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• pp.683-686
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• 1998

In this paper, the power factor correction (PFC) system for inverter air-conditioner that has not only good harmonic characteristics but also cost down-merit compared with the conventional inverter type is proposed. The detail design procedures to get cost-down merits are introduced. And it is shown that the PFC system performances also can be improved by the virtue of the stabilization of output voltage. The proto type system is implemented and tested to virify the additional good performances of the proposed system, and its simulation and experimental results are presented.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 전력전자학술대회 논문집
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• pp.31-34
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• 1998

In this paper, a Single-phase Active Rectifier(SAR) with high power factor capability for inverter air-conditioner is adopted for satisfying the international standards of input current harmonics, IEC 1000-3-2. Comparing the conventional boost power factor correction circuit, one diode drop is reduced in the power flow path of the SAR circuit, so the system efficiency is improved. To apply the control IC, such as UC3854, ML4821 and so forth, to the SAR, the adequate sensing circuits are proposed. The design rules of passive components and two control loops are also presented. The prototype SAR circuit with 3㎾ power consumption is builted and tested to verify the operation of the proposed circuit.