• Title/Summary/Keyword: 공기조화기

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A Study on the Evaluation Factors for Diffuser Noise of HVAC (공기조화 취출구 소음의 평가요인에 관한 연구)

  • Park, Hyeon-Ku;Kim, Hang;Kim, Sun-Woo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.16 no.2 s.107
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    • pp.149-155
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    • 2006
  • There are various types of noise around us such as road traffic noise, aircraft noise and floor impact sound, equipment noise, etc. Researches on the noise criteria and the evaluation method for the diffuser noise of HVAC are insufficient. dB(A) and NC values represented in ASHRAE guide book are applied as a noise criteria for diffuser noise, which have some problems like that the values between dB(A) and NC have deviation even if the sound is same one. Therefore, the evaluation method should be considered and proposed based on the subjective responses. From these reasons, this study aimed to analyze the evaluation factors for the diffuser noise of HVAC reflected on the subjective responses by surveying vocabularies and grouping them with factor analysis.

A Study on HVAC Parameter Monitoring System (Regarding Computer Validation) (HVAC 파라미터 모니터링 시스템에 대한 고찰 (Computer Validation 중심으로))

  • Kim, Jong-Gu
    • Proceedings of the SAREK Conference
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    • 2008.06a
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    • pp.90-95
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    • 2008
  • This article presents practical advice regarding the implementation and management of an impeccable Building Management System. The BMS was introduced to the series of computerized systems including manufacturing, storage, distribution, and quality control. Recently revised GMP regulation is requesting an improvement in drug product quality regulatory system by computer system validation. Quality is critical to guarantee the efficacy and the safety of drugs and is approved in the evaluation process after the audit trail application. HVAC parameter monitoring system will record the identity of operators entering or confirming critical data. Authority to amend entered data should be restricted to nominated persons. Any alteration to an entry of critical data should be authorized in advance and recorded with the reason for the change.

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A Study on the Evaluation Factors for Diffuser Noise of HVAC (공기조화 취출구 소음의 평가요인 설정에 관한 연구)

  • Park, Hyeon-Ku;Kim, Hang;Kim, Won-Sik;Kim, Sun-Woo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.11a
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    • pp.349-354
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    • 2005
  • There are various types of noise around us such as road traffic noise, aircraft noise and floor impact sound, equipment noise etc. Recently researches on the criteria to evaluate the noises have been progressed, however, researches on the noise criteria and evaluation method for the diffuser noise of HVAC are insufficient. dB(A) and NC values represented in ASHRAE guide book are applied as a noise criteria for diffuser noise, which have some problems like that the values between dB(A) and NC have deviation even if the sound is same one. Therefore, the evaluation method should be considered and proposed based on the subjective responses. From these reasons, this study aimed to analyze the evaluation factors for the diffuser noise of HVAC reflected on the subjective responses by surveying vocabularies and grouping them with factor analysis.

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Air handling unit utilizing water/air direct contact heat exchanger with mesh (공기조화기내 메쉬삽입 물-공기 직접접촉의 열전달 특성 연구)

  • Jeon, Yong-Han;Mun, Myeong-Hun;Kim, Jong-Yoon;Kim, Nam-Jin;Seo, Tae-Boem;Kim, Chong-Bo
    • Proceedings of the SAREK Conference
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    • 2008.06a
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    • pp.1161-1166
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    • 2008
  • The objective of this research was to investigate the enhancement of heat transfer by mesh in water/air direct contact air conditioning system. Mesh is inserted as a turbulent promoter in front of the water injection nozzle. The heat transfer characteristics with and without mesh and the effect of the number of inserted mesh and mesh porosity size have been studied experimentally. Inserted mesh improves heat transfer efficiency compared to non-inserted mesh system and heat transfer efficiency increased as the number of mesh is increased. Meanwhile, heat transfer efficiency decreased as the porosity of the mesh is increased. With inserted mesh, inlet and outlet temperature difference of air increased more than 50%. Heat exchange time of water/air to reach the 100% humidity decreased less than 30%. This result shows inserted mesh can enhance the performance of the water/air direct contact air conditioning system.

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Air Handling Unit Utilizing Water/Air Direct Contact Heat Exchanger with Mesh (공기조화기내 메쉬삽입 물-공기 직접접촉의 열전달 특성 연구)

  • Jeon, Yong-Han;Kim, Jong-Yoon;Kim, Nam-Jin;Seo, Tae-Boem;Kim, Chong-Bo
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.20 no.1
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    • pp.75-80
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    • 2008
  • The objective of this research was to investigate the enhancement of heat transfer by mesh in water/air direct contact air conditioning system. Mesh is inserted as a turbulent promoter in front of the water injection nozzle. The heat transfer characteristics with and without mesh and the effect of the number of inserted mesh and mesh porosity size have been studied experimentally. Inserted mesh improves heat transfer efficiency compared to non~inserted mesh system and heat transfer efficiency increased as the number of mesh is increased. Meanwhile, heat transfer efficiency decreased as the porosity of the mesh is increased. With inserted mesh, inlet and outlet temperature difference of air increased more than 50%. Heat exchange time of water/air to reach the 100% humidity decreased less than 30%. This result shows inserted mesh can enhance the performance of the water/air direct contact air conditioning system.

Development of pre-filter for airconditioner using of illite found in youngdong area (영동산 일 라이트를 이용한 공조기의 프리필터 개발)

  • 김진철;구경완;류명환;한위생
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.07a
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    • pp.507-510
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    • 2001
  • 본 논문은 일 라이트의 항균 방취 및 세균 흡착 능력을 공기조화기 및 공기청정기의 프리필터로 함침하여 사용함으로서 필터의 탈취 시험결과는 암모니아, 메틸멀캅탄, 트리메틸아민, 황화수소를 가지고 실험결과 거의 모든 가스를 흡착하였고 필터의 항균시험 결과 두가지의 균주를 사용하였는데 균주 1 - Staphylococcus aureus ATCC 6538과 균주 2 - Escherichia coli ATCC 25922는 균 감소율이 99.9% 이상을 보였다. 따라서 본 논문이 의도하였던 모든 특성을 만족한 결과가 도출되었다.

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An Experimental Study of the Air-side Particulate Fouling of Finned-Tube Heat Exchangers of Air Conditioners by using Accelerated Particle-Loading System (파울링 형성 가속장치를 이용한 공기조화기용 열교환기의 공기측 파울링 특성에 대한 실험적 연구)

  • 안영철;조재민;이재근;이현욱;안승표;윤덕현;하삼철;강태욱;옥주호
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.15 no.10
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    • pp.802-808
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    • 2003
  • The air-side particulate fouling of the HVAC heat exchangers degrades the performance of cooling capacity, pressure drop across a heat exchanger, and indoor air quality. The purpose of this study is to investigate the fouling characteristics using accelerated particle loading system. The fouling characteristics are analyzed as functions of a dust concentration, a face velocity and a wet or dry surface condition. The pressure drop increases with increasing test operation and reaches constant asymptotic level. For the saturated condition due to particle loading, the pressure drop across the slitted finned-tube heat exchangers at the face velocity of 1 m/sec increases up to 57% and the cooling capacity decreases about 2%. The cooling capacities are not affected greatly by the presence of the fouling deposits if the thickness of the fouling deposits can not change substantially the flow pattern through the fins.

A Novel Development of Distributed Intelligent Control Module Based on the LonWorks Fieldbus for Air Handling Units in the Healing, Ventilating and Air Conditioning (LonWork fieldbus 기반을 가진 HVAC 공기조화기용 고성능 지능형제어모듈 개발)

  • 홍원표
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.18 no.1
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    • pp.115-121
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    • 2004
  • In this paper, a new distributed intelligent control module based on LonWoks fieldbus for air handling unit(AHU) of heating, ventilating and air-conditioning(HVAC) is proposed to replace with a conventional direct digital control(DDC) system with 32 bit microprocessor. The proposed control architecture has a excellent features such as highly compact and flexible function design, a low priced smart front-end and reliable performance with various functions. This also addresses issues in control network configuration, logical design of field devices by S/W tool, Internet networking and electronic element installation. Experimental results for showing the system performance are also included in this paper.

수치해석을 이용한 대류열전달의 국내 연구동향

  • 이택식;이재헌;최영기;유재석
    • Journal of the KSME
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    • v.29 no.4
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    • pp.394-402
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    • 1989
  • 열전달 분야 중에서도 대류열전달에 관련된 수치해석적 연구가 현재 국제적으로 많은 연구의 대상이 되고 있으므로 이번 기회에 국내에서 수치적 방법을 이용한 대류열전달 분야의 연구동 향을 간략히 기술하고자 한다. 대류열전달 분야를 소분류하는 방법에는 여러 가지가 있겠으나 이번 조사에서는 "자연대류 열전달", "강제대류 열전달" 그리고 "상변화 열전달"의 세 가지로 분 류하였으며 위의 분류에 명확히 속하지 않는 것이라고 유사성을 참고하여 분류하였다. 상기 각 분야에서의 기술 순서는 대략적으로 발표년도 순서를 따랐다. 본 연구동향의 조사에서는 국내 학술 문헌중 "대한기계학회논문집"을 중심으로 하여 이외에 관련된 학술지로서 "공기조화. 냉동 공학", "태양에너지"등에 수록된 논문을 발췌 요약하였다.uot;공기조화. 냉동 공학", "태양에너지"등에 수록된 논문을 발췌 요약하였다.된 논문을 발췌 요약하였다.

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