• Title/Summary/Keyword: HVAC design

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A Study on the Introduction of Fuzzy system into the Decision-Making process of HVAC designers

  • Woo, Se-Jin
    • International Journal of Fuzzy Logic and Intelligent Systems
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    • v.4 no.1
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    • pp.12-17
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    • 2004
  • This study is designed to grope for logical methods in the decision-making process of human beings such as creation and analysis. With this in mind, the paper worked with a process where the designers of a design team gather and analyze their opinions in a design process to decide on the HVAC system of buildings. The paper introduced the fuzzy theory, or one of the methods to quantitatively describe language values with ambiguous features, suggesting a method to determine the judgement and suggestion values of the HVAC designers with the characteristics of language variables as the values of design factors greatly influencing the HVAC system. As a result, the paper tested the possibility of the fuzzy system as a logical method to gather the judgement of HVAC designers in a stage of HVAC type selection exerting a great influence on the experience and judgement of the designers and having powerful linguistic features and to determine an appropriate HVAC type which can satisfy the suggested values of related design factors.

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
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    • v.16 no.8
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    • pp.762-769
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    • 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
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    • 2007.11a
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    • pp.58-63
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    • 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.

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The Study on Optimization of HVAC Systems Design in Tall Buildings (초고층 건축물의 최적화된 설비시스템 설계를 위한 기초연구)

  • Yu, Jung-Yeon;Cho, Dong-Woo;Yu, Ki-Hyung
    • KIEAE Journal
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    • v.5 no.1
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    • pp.11-18
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    • 2005
  • The optimized HVAC system design in tall buildings enable owners to save unnecessary energy consumption and residents to have comfort environments. The purpose of this study is to develop design process for optimized HVAC system design in tall buildings. As basic researches, literature researches and case studies of HVAC system design in tall buildings were performed. Survey was processed among expert in the field and key considerations on HVAC system design were drew as conclusions. With these conclusions, studies were performed on effects of wind velocity, outdoor air temperature, and solar radiation that are main factors of load calculation in tall buildings. Finally, air-tightness and stack effect were analyzed and estimated by literature studies, field measurements and computer simulations.

Numerical Study to Improve the Flow Uniformity of Blow-Down HVAC Duct System for a Train (전동차용 Blow-Down HVAC 덕트 시스템의 유동 균일도 향상을 위한 수치적 연구)

  • Kim, Joon-Hyung;Rho, Joo-Hyun
    • The KSFM Journal of Fluid Machinery
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    • v.19 no.1
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    • pp.18-23
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    • 2016
  • A HVAC(Heating Ventilation and Air Conditioning) is adapted to increase the comfort of the cabin environment for train. The train HVAC duct system has very long duct and many outlets due to the shape of a train set. the duct cross section shape is limited by a roof structure and equipments. Therefore, the pressure distribution and flow uniformity is an important performance indicator for the duct system. In this study, the existing blow down type HVAC duct system for a train was supplemented to improve the flow uniformity by applying a design method combining design of experiment (DOE) with numerical analysis. The design variables and the test sets were selected and the performance for each test set was evaluated using CFD(Computational Fluid Dynamics). The influence of each design variable on the system performance was analysed based on the results of the performance evaluation on the test sets. Furthermore, the optimized model, whose the flow uniformity was improved was produced using the direct optimization(gradient-based method). Finally, the performance of the optimized model was evaluated using numerical analysis, and it was confirmed that its flow uniformity has indeed improved.

The Numerical Simulation of Fluid Flow in an Automotive HVAC module by using Commercial Code (상업용 코드를 이용한 차량용 HVAC module의 유동에 관한 전산모사)

  • KIM H. B.;HONG S. R.;CHUNG D. S.
    • 한국전산유체공학회:학술대회논문집
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    • 2003.08a
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    • pp.194-199
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    • 2003
  • The studying is to analyze characteristic of air flow and is used to design in an automotive HVAC module. The RNG k-e turbulence model with the Upwind Difference convection scheme and an unstructured hybrid mesh with arbitrary matching method were applied to the simulation. The comparing air flow characteristic of the basic HVAC module and total HVAC module with blower were discussed in the paper.

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Study on HVAC System in Nuclear Facility (원자력시설의 공기조화 시스템 고찰)

  • 백상열;송웅섭;오연우;주용선;홍권표
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • 2003.11a
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    • pp.503-508
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    • 2003
  • Heating, Ventilation and hir Conditioning (HVAC) system in nuclear facility should be equipped and constructed more stable and allowable than that in common facility. The purpose of HVAC system is the maintenance of optimum working environment, the protection of worker against a contaminated air and the prevention of atmospheric contamination due to a outward ventilation, etc.. The basic scheme of a safety operation of nuclear facility is to prevent the atmospheric contamination even in low level. The adaptability of HVAC system should be taken into account in the design stage so that it is possible to modify the system which is in operation. In this study, the design requirements of HVAC system in nuclear facility and the HVAC systems in foreign countries are reviewed, and the results can be utilized in the design of HVAC system in nuclear facility.

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Design and Economics of HVAC System for Reduction of Power Consumption in Blow Mold Machine (플라스틱 연료탱크 생산 설비에서의 소비 전력 저감을 위한 공조 시스템 설계 및 경제성 평가)

  • Lee, Youngjae;Choi, Seukcheun
    • Journal of Power System Engineering
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    • v.21 no.4
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    • pp.84-93
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    • 2017
  • This study was carried out to improve the electric power consumption of HVAC in the blow mold machine(BMM) and work environment. The experiment was conducted with the simulated HVAC system of 1/15 of the actual BMM. The temperature of main facility and two preheaters was fixed at 200 and $60^{\circ}C$ respectively in all test conditions. The measured points of temperature were chosen as critical locations considering the work environment. The tendency of temperature distributions decreases as the duct was closed to the main facility. The reduction rate of power consumption of HVAC increases up to 32.3% when both duct and cooling systems are operated. Also the efficiency of HVAC is improved about 9% through the modified design of duct system. It notes that the electric power consumption of HVAC can be reduced by the optimum design and operating condition of duct and cooling system.

Development of Integrated HVAC Noise Analysis Program for Ships (선박용 통합 HVAC 소음해석 프로그램 개발)

  • Han, Ju-Bum;Hong, Suk-Yoon;Song, Jee-Hun;Kim, Nho-Seong;Chun, Seung-Hyun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2011.04a
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    • pp.588-593
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    • 2011
  • The Main design parameters of ship HVAC systems are pressure drop and noise analysis of ducts. The Noise prediction for HVAC(Heating, Ventilating and Air Conditioning) systems are normally performed by empirical method suggested by NEBB(National Environmental Balancing Bureau, 1994), but NEBB's method is not suitable for the ship HVAC systems. In this paper, numerical analysis methods are used to develop a noise prediction method for the ship HVAC systems, especially for large ducts. To develop regression formula of attenuation of sound pressure level in large duct, Boundary Element Method(BEM) is used. Using dynamic loss coefficient which is suggested by ASHRAE fitting data base and numerical methods of HVAC noise analysis, integrated HVAC noise analysis of Program is developed. The developed program can present pressure drop and noise analysis of the ship HVAC systems. To verify the accuracy and convenience of the developed program, prediction of HVAC system for Semi-Submersible Drilling RIG is carried out and the results are compared with measurement of noise level during sea trial.

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A Study on the Duct Design of HVAC System Using the Equal Friction Method and the T-method (등압법과 T-method를 이용한 공조시스템 배관 설계에 관한 연구)

  • Park, Joon-Suk;Choi, Gil-Hwan;Cho, Dae-Seung
    • Journal of the Society of Naval Architects of Korea
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    • v.46 no.4
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    • pp.435-443
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    • 2009
  • Optimal duct design of a HVAC system requires analysis technology to accurately evaluate its pressure losses, flow rate and velocity for making a compromised design among fan capacity and duct size affecting initial manufacturing and operation costs, and noise induced by the HVAC system. In this paper, we carry out initial duct design using the equal friction method. Using the result, the T-method is applied for accurate analysis of flow rate. Then, the duct size is modified using the difference between the required and the calculated flow rate, which can guarantee required flow rate, reduce the pressure unbalance among duct paths and lead to select optimal fan performance. To verify the validity and effectiveness of the proposed design method, an example for HVAC system design including noise analysis is demonstrated.