• Title, Summary, Keyword: air conditioner

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A Study of Failure Examples for Refrigerant Gas Leakage in Automotive Air Conditioner System (자동차 에어컨 냉매 가스 누설에 대한 고장사례 고찰)

  • Lee, Il Kwon;Kook, Chang Ho;Moon, Hak Hoon;You, Chang Bae
    • Journal of the Korean Institute of Gas
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    • v.20 no.2
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    • pp.10-15
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    • 2016
  • This paper is to analyze and study the failure examples of refrigerant gas in automotive air conditioner. The first example, the air conditioner compressor continually operated that the refrigerant was leaked in air conditioner system. By lubrication shortage, the piston was partially sticked on cylinder of air conditioner compressor inner part. This was caused the phenomenon of engine operation trouble by load increasing with engine rpm variation during engine running. The second example, it sought the fact that the air conditioner refrigerant gas was leaked from air conditioner compressor to condenser high pressure pipe toward rear air conditioner checking with the lines of air conditioner. The third example, the refrigerant gas of air conditioner found that was leaked imperceptible from condenser inner by crack that was generated on the fins of air conditioner condenser. Therefore, the air conditioner system that maintain the air conditioner by decreasing the in-car temperature must meticulously manage to not leak the air conditioner refrigerant gas.

The Effects of Air Conditioner Noise on Classroom Acoustics (교실 음향에 대한 에어컨 소음의 영향)

  • Kim, Su-Yeon;Jeon, Jin-Yong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.176-179
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    • 2005
  • A case-study in classroom acoustics was conducted and the effects of two types(system air conditioner and packaged air conditioner) of air conditioner were investigated. Acoustical measurements were made in two different classrooms. Each classroom has different acoustics showing sound quality of air conditioner. Mental concentration test was conducted to evaluate the effects of air conditioner noise with different sound presure level(dBA). Speech intelligibility test was also planed with adopting Korean phonetic balanced words.

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Modelling of System Air-Conditioner for Dynamic Simulation (동적시뮬레이션을 위한 시스템 멀티에어컨의 모델링)

  • Lee, Yoon-Jong;Kim, Chan-Jung;Moon, Je-Myung;Kim, Cheol-Woo;Seo, Hyeong-Joon;Kim, Gyoung-Rok;Shin, Haeng-Cho;Hong, Hi-Ki
    • Proceedings of the SAREK Conference
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    • pp.328-333
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    • 2007
  • The purpose of this study is modelling of system air-conditioner for TRNSYS. System air-conditioner is operated by a variable capacity compressor and accommodated by multiple evaporators. By reason of these feature, realizing performance of system air-conditioner for TRNSYS was incomplete. In this study performance data of system air-conditioner and control logics are used to make system air-conditioner module for TRNSYS. Performance data contains total capacity, power input and capacity index of system air-conditioner. The simulation was carried out in a mode of temperature level control using TRNSYS 16. The simulation shows that the system air-conditioner model operate variable capacity and can compute capacity index and power input of system.

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Estimation of the Noise Caused by the System Air Conditioner and its Improvement (시스템 에어컨에 의한 실내 소음 평가 및 개선 설계)

  • Lee, Jea-Won;Joo, Jae-Man;Oh, Sang-Kyong;Song, Yong-Jae
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.862-865
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    • 2004
  • The system air conditioner has an outdoor unit and a number of indoor units, which connected by several long pipes. In comparison with building HAVC system, the system air conditioner doesn't need lots of facilities, such as control of room, cooling tower, etc. At the beginning stage for the market of the system air conditioner, its main application was a school which size is small to use the building HAVC and large to use home air conditioning system, such as PAC (package air conditioner), RAC (room air conditioner). Therefore, because of the advantages of the system air conditioner mentioned above, the market is expanded rapidly. Since it is difficult to evaluate the noise caused by the system air conditioner because it has to be implemented before the finish of construction, the prediction or estimation of the noise by using CAE technology should be very important. In this research, using a commercial code, RAYNOISE, the noise is estimated to improve the design of building.

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A comparison of resident's behavior of operating air conditioner according to the charge for electric (사용자의 전기요금 부담 여부에 따른 여름철 냉방기 사용 특성의 비교)

  • Kwon, Suh-Hyun;Choi, Yoo-Rim;Chun, Chung-Yoon
    • Proceeding of Spring/Autumn Annual Conference of KHA
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    • pp.301-305
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    • 2006
  • An electrical bill is one of the various factors that influence on energy use of residents. This study focused on electrical bills and searched that whether electrical bills affect resident behavior of operating air conditioner and their controlled indoor climate. We surveyed two groups for field study ; the one is residents who live in a studio apartment in Seoul and they are charged for electric as energy consumption they used, and the other is residents who live in a university dormitory and they are not charged for their energy consumption. We measured how long they used the air conditioner for cooling, on/off temperature of air conditioner and room temperature for these two groups. Residents were interviewed about their cooling needs, decisions about when to turn on their air conditioner and so on. We found that dormitory group has much amount of time used the air conditioner than studio apartment group and there are differences of room temperature between two groups when they turn on or off air conditioner. The result shows that perception of money affects resident behavior of operating air conditioner and their acceptable thermal range.

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Vibration Reduction of Pipe Line in Air-conditioner for Railway Vehicle (철도차량용 냉방기 배관계의 진동저감 연구)

  • You, Won-Hee;Jung, Yong-Ho;Koo, Jeong-Seo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.22 no.10
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    • pp.925-931
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    • 2012
  • The air-conditioner for railway vehicle should have vibration durability in order to operate normally in vehicle running situation. KS R 9144(vibration test methods for railway vehicle parts) is used to verify the vibration durability. The specifications of compressor, condenser and evaporator for air-conditioner in railway vehicle are standardized, but the shape and structure of pipe lines are not specified. Because the air-conditioner handler produces the pipe line arbitrarily, sometimes the pipe line is broken during the vibration durability test. In this research the cause identification and solution of pipe line breaking problem in during the vibration durability test were studied for air-conditioner of railway vehicle(diesel multiple unit). It was found that the natural frequency of pipe line is related to the pipe line breaking by experiment. A new pipe line shape was introduced by using FEA in order to avoid the resonance. The prototype new pipe line was applied to air-conditioner and the natural frequency was measured by experiment in order to verify the resonance avoidance. The vibration reduction of air-conditioner with new pipe line was reviewed by comparing to the air-conditioner with original one.

Parametric Study on Performance of an Automobile Air Conditioner (차량용 에어컨의 성능에 미치는 인자에 관한 연구)

  • Park, Y.C.;Kwon, K.R.
    • Journal of the Korea Society For Power System Engineering
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    • v.6 no.4
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    • pp.16-22
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    • 2002
  • This study was conducted to find performance evaluation method for automobile air conditioner. Experimental facilities were constructed to simulate wide range of operating condition for the automobile air conditioner. Compressor speed was controled by variable speed electric motor and the power was measured through torque transducer and tachometer was used to measure compressor speed. Parametric studies were conducted in this study, to figure out effect of environment variables on the performance of the automobile air conditioner. The environmental variables are inlet air temperature, relative humidity and air flow rate for the evaporator and inlet air temperature and air flow rate for the condenser. Compressor speed is also changed. The results of this study shows that air flow rate of the evaporator is more sensitive to the performance of the automobile air conditioner than the other variables. However relative humidity of the inlet air of the evaporator strongly affects capacity rather that COP.

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The sound quality evaluation of an air-conditioner based on consumer sensory evaluation (소비자 감성 평가를 통한 에어컨 음질 평가)

  • Kim, Hooi-Joong;Lee, Jin-Kyung;Lee, Jea-Won;Cho, Sung-Jin
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.630-633
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    • 2007
  • This paper proposes method to find the subjective satisfaction index of an air-conditioner using consumer's sensory evaluation for an air-conditioner. A satisfaction index of an air-conditioner is presented the annoyance and freshness as ${\alphs}$, ${\beta}$ exponents of 1/f slope and is changed the annoyance and freshness as exponents of 1/f slope are changed. The satisfaction index of an air-conditioner is not improved if SPL is above the proper level although the 1/f slope has optimal ${\alpha}$, ${\beta}$ values. Therefore, this paper proposes the satisfaction index of an air-conditioner considered both SPL and ${\alpha}$, ${\beta}$ exponents of 1/f slope.

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Numerical study on the flow characteristics in Air-conditioner duct of EMU (전동차 공조기 덕트 내의 유동특성에 관한 수치해석적 연구)

  • Kim Seung-Tech;Kim Sung-Jong;Park Geun-Soo;Park Hyung-Soon
    • Proceedings of the KSR Conference
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    • pp.345-350
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    • 2003
  • The inside of EMU is supplied with the cooling air from air-conditioner and the fresh air from exterior through the air-conditioner duct which is one of the air conditioning system. The shape of air-conditioner duct is a major factor in determining the air-conditioning efficiency, thermal comfort and energy efficiency. Therefore, this study is to understand the flow characteristics in the air-conditioner duct by three dimensional numerical simulation. The air-conditioner duct was calculated for the design volume flow rate, $2,726\;m^3/h/unit$. From the result of calculation and measurement, the velocity at diffuser outlet presented good agreement in general. [n this present study, the calculation was also performed for three volume flow rate(1,800, 2,200, 3,000 $m^3/h/unit$) and total pressure characteristic curve with volume flow rate was presented.

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Experimental Study on the Cooling seasonal Performance Factor of Room Air-conditioner (에어컨의 냉방기간 에너지 효율 산출을 위한 실험적 연구)

  • Lee, H.W.;Moon, J.H.;Bae, Y.D.;Park, J.C.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.4 no.3
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    • pp.204-216
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    • 1992
  • In most cases, EER(Energy Efficiency Ratio) is available to present energy efficiency of air-conditioners. But, EER is not adapt to measure energy efficiency at actual life environment because it is based on fixed temperature and humidity contditions. To overcome this disadvantage, there is need to introduce SEER(Seasonal Energy Efficiency Ratio) established at time varient temperature and humidity conditions. In this paper, SEER measurement method and conditions based on actual life environment of the country is introduced, and discussed SEER value about two air-conditioner type, that is, non inverter air-conditioner and inverter air-conditioner. As a result of, inverter air-conditioner was superior to non inverter air-conditioner at cooling seasonal energy efficiency.

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