• Title, Summary, Keyword: HVAC요소

Search Result 22, Processing Time 0.041 seconds

A Study on Design Decision of Qualitative Design Factors in Selecting of HVAC Type for Building (건축물의 공조방식 선택과정에 있어서 질적 설계요소들의 디자인 결정방법에 관한 연구)

  • 우세진
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.16 no.8
    • /
    • pp.762-769
    • /
    • 2004
  • Not only in building design but also in HVAC system design, it is important to ensure an objectivity in schematic design. In the study, the author suggested a method to make a logical decision for quality design factors a(footing the selection of HVAC type in initial design process, and to provide objective design values. Fuzzy theory, one of the theories describing in quantitative way the ambiguous-natured linguistic values, was used to determine the qualitative design factors of linguistic parameter nature. It was found that it has a potential as a method to determine a HVAC type satisfying the required values of qualitative design factors involved in selection of the system type. But this needs further studies to be settled in the selecting of HVAC type.

A Study on the Energy Conservational HVAC System Design Strategies (에너지 절약적 공조시스템 선정을 위한 기초적 연구)

  • Cho, Jin-Kyun;Hong, Min-Ho;Jeong, Cha-Su;Kim, Byung-Seon
    • Proceedings of the SAREK Conference
    • /
    • /
    • pp.58-63
    • /
    • 2007
  • Lots of needs are being paid for how to design HVAC system in large-scale buildings. Increasing awareness of energy use is main point of this research. HVAC systems' energy characteristics are not clearly identified and understood, so the optimal design of HVAC system is very important. The energy parameters of HVAC design that are system input energy, water/air moving equipments (pumps/fans) energy and outdoor air conditioning energy for IAQ are important. The purpose of this study is to provide the basic data for energy conservational HVAC design strategies.

  • PDF

Evaluation of Noise Reduction Performance of HVAC System for Ships (선박용 HVAC 시스템의 소음저감성능 평가)

  • Kim, Sang-Ryul;kim, Hyun-Sil;Kim, Jae-Seung;Kim, Bong-Ki;Lee, Sung-Hyun
    • The Journal of the Acoustical Society of Korea
    • /
    • v.29 no.8
    • /
    • pp.497-503
    • /
    • 2010
  • In this paper, evaluation of noise reduction performance of HVAC system for ships by means of HVAC mock-up system is presented. Test is done for six different types of HVAC elements including room unit, silencer, etc. It is found that when diameter of silencer is small and air flow is large, flow noise degrades insertion loss. However, as diameter of silencer becomes larger, the effect of flow noise becomes smaller, and insertion loss up to 25 dB is measured. It is observed that insertion loss of diffuser type room unit is usually between zero and 10 dB, whereas that of the nozzle type room unit can be down to - 15 dB. In addition, it is shown that changing duct arrangement can reduce cabin noise by up to 2 dB, and providing same air flow to each room unit is crucial for generating less noise.

Computational Analysis on the Noise Characteristics of Ship Large Duct (선박용 대형 덕트의 소음 특성 전산해석 연구)

  • Song, Jee-Hun;Hong, Suk-Yoon;Lee, Yi-Soo;Kwon, Hyun-Wung
    • Journal of the Korean Society of Marine Environment & Safety
    • /
    • v.21 no.6
    • /
    • pp.751-758
    • /
    • 2015
  • Noise prediction for HVAC(Heating, Ventilating and Air Conditioning) systems are normally performed by empirical method suggested by NEBB(National Environmental Balancing Bureau, 1994). However, the method is not suitable for large ducts in ships. In this paper, computational analysis methods are used to develop a noise prediction method for the large ducts in ships. To develop regression formula of attenuation of sound pressure level in large ducts, Boundary Element Method(BEM) is used. BEM and Computational Fluid Dynamics(CFD) are applied to the analysis of flow-induced noise in ducts with stiffeners inside. Loud noise above 100 dB can be generated in some cases. Breakout noises of large ducts are also analyzed by using BEM and Finite Element Method(FEM). The acoustic pressure level shows about 10-15dB difference between inside and outside of the duct. Utilizing the results of this study, it is expected that shipyard planners can predict noise of the HVAC system for ships.

Development of shipboard large-sized low-noise room unit with multiple outlets (다수의 출구를 가진 선박용 대형 저소음 룸유닛 개발)

  • Kim, Sang-Ryul;Kim, Hyun-Sil;Lee, Sung-Hyun;Park, Geun-Hyo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.600-605
    • /
    • 2012
  • In this paper, the acoustic performance of a shipboard large-sized room unit is studied. The room unit is a kind of rectangular absorptive chamber with a partition whose surface absorptive material with fabric skin is attached to. The room unit has one inlet and three outlet. At the inlet, a plane damper is installed to control the flow rate. The acoustic performance of a prototype room unit is measured using a HVAC mock-up. It is shown that its insertion loss is comparable with that of a commercially-used room unit but the developed room unit generates flow noise higher than the other one. The major source of flow noise is analyzed by NADS-R, the noise analysis program for room unit. Cone-shaped dampers are proposed to be used as the damper of a room unit to reduce flow noise. It is shown that the cone-shaped damper decrease flow noise remarkably.

  • PDF

Development of Shipboard Large-sized Low-noise Room Unit with Multiple Outlets (다수의 출구를 가진 선박용 대형 저소음 룸유닛 개발)

  • Kim, Sang-Ryul;Kim, Hyun-Sil;Lee, Sung-Hyun;Park, Keun-Hyo
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.22 no.5
    • /
    • pp.468-473
    • /
    • 2012
  • In this paper, the acoustic performance of a shipboard large-sized room unit is studied. The room unit is a kind of rectangular absorptive chamber with a partition whose surface absorptive material with fabric skin is attached to. The room unit has one inlet and three outlets. At the inlet, a plane damper is installed to control the flow rate. The acoustic performance of a prototype room unit is measured using a HVAC mock-up. It is shown that its insertion loss is comparable with that of a commercially-used room unit but the developed room unit generates flow noise higher than the other one. The major source of flow noise is analyzed by NADS-R, the noise analysis program for room unit. Cone-shaped dampers are proposed to be used as the damper of a room unit to reduce flow noise. It is shown that the cone-shaped damper decrease flow noise remarkably.

A Numerical Study of a Vehicle Windshield Defrosting Mechanism (자동차 전면유리 제상 메커니즘의 수치해석 연구)

  • Kang, Seung-Jae;Jun, Yong-Du;Lee, Kum-Bae
    • Journal of Energy Engineering
    • /
    • v.19 no.3
    • /
    • pp.151-155
    • /
    • 2010
  • Adequate visibility through a vehicle windshield and frost melting period are critical aspects of major design parameters. To make progress in this area, a good understanding of the flow behavior and heat transfer characteristics produced by the HVAC module is required. The computational study was used to perform the parametric investigation into the defroster nozzle's performance with a full-scale model. The study highlights the drawbacks of current designs and points the way to improve passive defrosting mechanism. The results show that the current design of the defroster nozzles deliver the maximum airflow in the vicinity of the lower part of the windshield, which yields unsatisfactory visibility. Defrosting performance was excellent when the injection angle of the defrost nozzle was 45 degree. The numerical analysis satisfies the criteria provided by NHTSA.

A study on the food clean room system observing the regulations of HACCP (HACCP의 환경 최적화를 위한 식품 클린룸 설계에 관한 연구)

  • Won, Young-Jae;Suh, Kee-Won
    • Proceedings of the SAREK Conference
    • /
    • /
    • pp.520-526
    • /
    • 2009
  • This study proposed the optimum design values for the biological clean room system observing the regulations of Hazard Analysis Critical Control Point (HACCP). Even though the standard for industrial clean room system has been well established, the basis for biological food clean room system is the first stage. In order to prevent the contaminations in advance for food storages, processes, and distributions, the criterion of Hazard Analysis Critical Control Point is positively required. This study also suggested the possible ways of how to avoid the hazardous contaminations.

  • PDF