• Title/Summary/Keyword: refrigerator

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A Study on Performance Characteristics of A Single Effect LiBr/Water Refrigeration Cycle (단효용 LiBr/물 흡수식 냉동사이클의 성능특성에 관한 연구)

  • 연제문;임삼택;오주원;이경우
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2001.05a
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    • pp.95-99
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    • 2001
  • As a way to use energy effectively, the present study is aimed at investigating the performance characteristics of a Single Effect LiBr/Water Absorption Refrigerator using a low temperature driving heat-source. It was carried out by changing the driving heat-source temperature, the cold water outlet temperature(the refrigeration load), the cooling water inlet temperature, and the weak solution flow rate and this study compares the performance characteristics of refrigerator against the existence and non-existence of the Recirculation of the Weak solution which is used as a method to improve the performance of refrigerator. In case of Recirculation of the weak solution, more improved the Refrigeration Capacity and COP was obtained, and these effects became more larger in the high temperature of driving heat-source and large quantity of solution.

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Evaluation of indoor refrigerator noise in steady-state condition (주거 공간내 냉장고 소음의 정상상태 평가)

  • Lee, Chung-Hwa;Jeong, Jeong-Ho;Jeon, Jin-Yong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.11a
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    • pp.790-795
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    • 2004
  • The characteristics of refrigerator noise recorded in anechoic chamber was investigated in condition of a the real living room and a kitchen. To predict the noise propagation in an apartment unit, room acoustic simulation software was used. It was found that the noise level in the real living room was $4\sim8dB$ higher than in the anechoic chamber. When a noise barrier and absorption materials were used on the rear wall and floor, the noise level reduced up to $3\sim4dB$. In addition, when the subjective evaluation of auralized refrigerator noise was undertaken using headphone, it was revealed that 21dB (A) is the allowable sound pressure level of 95% satisfaction.

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Performance Characteristics of a Household Refrigerator with Dual Evaporators Using Two-Stage Compression Cycle

  • Joo, Young-Ju;Kim, Young-Heon;Lee, Moo-Yeon;Yoon, Won-Jae;Kim, Yong-Chan
    • International Journal of Air-Conditioning and Refrigeration
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    • v.17 no.3
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    • pp.107-113
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    • 2009
  • The objective of this study is to investigate performance characteristics of a household refrigerator using a two-stage compression cycle. The performance of the two-stage compression cycle was measured by varying the compressor speed, condensing temperature, and evaporating temperature. The COP of the two-stage compression cycle was analyzed and then compared with that of the single-stage compression cycle. The optimum combination of compressor speeds for a low- and a high-stage was determined. The COP of the two-stage compression cycle using a PTC (parallel two-stage compression) method was 5.85% higher than that of a STC (serial two-stage compression) method at optimum operating conditions.

A Study on flow optimization of thermoelectric refrigerator using visualization technique (가시화 기법을 이용한 열전소자 냉장고의 유동최적화에 관한 연구)

  • Kim, Bo-ra;Lee, Change-je;Jeong, Yeon-ho;Whang, Kwang-il;Cho, Gyeong-rae
    • Journal of the Korean Society of Visualization
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    • v.19 no.1
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    • pp.94-99
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    • 2021
  • In order to increase the efficiency of thermoelectric refrigerators using the Peltier effect, it is necessary to optimize the distribution of the flow of cold air from the fan. In this study, the flow flowing upwards and downwards while changing the area of the flow path was visualized using the PIV technique for the control of cold air in a thermoelectric refrigerator. From these results, the flow rate according to the change in the area of the flow path was confirmed, and design criteria for optimizing the distribution of cold air flowing to the top and bottom of the refrigerator were suggested.

Two-dimensional model analysis for the pulse tube of rotating pulse tube refrigerator (회전하는 맥동관 냉동기의 맥동관에 대한 2차원 모델 해석)

  • Chai J.;Jeong S.;Jeong Eun-Soo
    • Progress in Superconductivity and Cryogenics
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    • v.8 no.3
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    • pp.63-69
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    • 2006
  • This paper describes the effect of rotating frequency on the pulse tube of Stirling type pulse tube refrigerator. Various conditions were analyzed by two-dimensional analysis with several dominant non-dimensional parameters. With the additional pressure term influenced by centrifugal force in rotating condition, the linearized conservation equations of mass, momentum, energy of the gas were solved to obtain the first order variables and calculate the enthalpy flow in rectangular coordinates. The rotational effect in pulse tube for the refrigerator's performance were quantitatively evaluated. According to the first order analysis, the enthalpy flow decreases with the rotating speed.

A Study on the Principal Factors for the Stirling Refrigerator Performance (일체형 스터링 냉동기 성능에 미치는 주요 인자에 관한 연구)

  • Kim, D.W.;Park, S.J.;Hong, Y.J.;Kim, H.B.;Ko, S.C.
    • Progress in Superconductivity and Cryogenics
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    • v.10 no.1
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    • pp.67-70
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    • 2008
  • Performance of integral type Stirling refrigerator used for cooling infrared detector is affected by principal factors such as design factors and operating factors. Operating factors include charging pressure and operating frequency. The purpose of this paper is to examine the basic design analysis on the integral type Stirling refrigerator and the changes in performance through experiments on operating factors.

Research on fast cool-down of orifice pulse tube refrigerator by controlling orifice valve opening

  • Kim, Hyo-Bong;Park, Jong-Ho
    • Progress in Superconductivity and Cryogenics
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    • v.12 no.4
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    • pp.36-40
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    • 2010
  • In this paper, a noble method for rapid cooldown of pulse tube refrigerator (PTR) was proposed and experimentally investigated. An orifice pulse tube refrigerator generates refrigeration effect by expansion PV work at the cold-end, and its amount is affected by the orifice valve opening. There exists the optimum valve opening for maximum cooling capacity and it varies as cold-end temperature. It is verified from simulation results using isothermal model that the optimum valve opening increases as the cold-end temperature increases. In the experiments, a single stage orifice pulse tube refrigerator is fabricated and tested. The fabricated PTR shows 97.5 K of no-load temperature and 10 W at 110 K of cooling capacity with the fixed orifice valve opening. From experiments, the initial cooldown curve with four cases of valve opening control scenario are obtained. And it is experimentally verified that the initial cooldown time can be reduced through the control of orifice valve opening.

A Study on the Temperature Characteristics at the Inlet and the Outlet Pipes of a Refrigerator Drain Condenser (냉장고 배출수 응축기 입출구 배관에서의 온도 특성에 관한 연구)

  • Ha, Ji Soo;Kim, Tae Kwon
    • Journal of Energy Engineering
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    • v.23 no.4
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    • pp.247-255
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    • 2014
  • The present study was conducted to elucidate the characteristics of temperature at the inlet and outlet pipes of a refrigerator drain condenser and suggest the method to predict the temperature of the refrigerant at the inlet and outlet pipes of the drain condenser. For this purpose, a built in style refrigerator was installed in a constant temperature chamber to measure temperatures at the inlet and outlet pipes of the drain condenser. From the results of the present analysis, it could be seen that the measured temperatures changed from $37^{\circ}C$ to $46^{\circ}C$ and the actual refrigerant temperatures were higher than the measured temperatures with the difference magnitude of $8^{\circ}C$ to $22^{\circ}C$. The present study suggested that the temperatures of the refrigerator could be calculated with the measured temperatures by introducing curve fitting of the measured temperature. The predicted refrigerant temperatures by the present study had the accuracy within 6% error of the actual refrigerant temperatures.

Psychoacoustical Study for Sound Quality Index of Steady State Noise of Refrigerators (냉장고 정상상태 소음의 음질 인덱스 개발을 위한 심리음향학적 연구)

  • Kong, Kyung-Soo;Jung, Weui-Bong;Kim, Tae-Hoon;Shin, Dae-Sik;Ahn, Se-jin
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.26 no.5
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    • pp.536-545
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    • 2016
  • Household refrigerator radiates noise of which the pattern is dependent on the operating condition of its parts, such as compressor, flow fans, etc. Thus the refrigerator noise has a variety of frequency characteristics. Therefore, it is required to consider the noise characteristics for evaluating the noise quality and eventually developing the sound quality index of the refrigerator noise. In this study, five units of household refrigerator were selected to measure their noises that were used to generate sound sources for jury test of the study. The measured noises of five refrigerators were divided into ten kinds of sound source by considering operating condition and frequency characteristics. Additionally, the ten sources were each edited to have the same SPL of 30 dBA. Totally twenty kinds of sound sources (10-original SPL, 10-edited SPL 30 dBA) were evaluated by twenty-two subjects, and compared with their sound quality metrics. It was found that only the loudness of the metrics was meaningfully correlated with the subjective evaluation. The rests, sharpness, roughness and fluctuation strength, were not related. The conclusion of this study is that a new sophisticated index is necessary to be developed to qualitatively evaluate the household refrigerator noise.

Finite Element Analysis of Dynamic Deformation of Refrigerator's Lower Hinge during Drop Test (냉장고 낙하시 하힌지 동적변형 해석)

  • Hong, Seokmoo;Choi, Yong Chan;Eom, Seong-Uk;Kim, Hong Lae;Hyun, Hong Chul
    • Transactions of the KSME C: Technology and Education
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    • v.3 no.1
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    • pp.37-44
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    • 2015
  • 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.