• Title, Summary, Keyword: HVAC

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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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    • 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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VAV Air Conditioning Research for Ship HVAC Efficiency (선박 HVAC 효율 증가를 위한 변풍량 방식 공기조화 연구)

  • Kang, Young-Min;Kim, Min-Wook;Jang, Jae-Hee;Kim, Hui-Mang;Oh, Jeon-Seok
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.93-95
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    • 2016
  • In recent years, attention of ship owners for the energy saving of the vessel is being collected due to the volume decline. Ship accommodation consists of watertight type windows and is closed, Ship HVAC is used to promote a comfortable environment for the crew. In addition requirements for comfort of the crew is getting stronger with the improvement of living standards, there is a need for HVAC improvements. In this paper, propose method to save energy and improve HVAC controls by using the HVAC structure of the variable air volume.

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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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    • 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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The Noise Analysis of Ship HVAC System Based on GUI Modeling (GUI Modeling을 기반으로한 선박의 HVAC System 소음 해석)

  • 이철원;김노성;최수현
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.1300-1305
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    • 2001
  • One of the main noise sources in cabin onboard ships is HVAC system. Up to now, the HVAC system designer manually calculates the HVAC system noise, or uses the program that is generally based on text user interface. In such a case, it is difficult to use the program and also to obtain the flow induced noise. In this study, the HVAC noise analysis program has been developed, which is based on GUI user interface that include 3.D modelling and model modification modules. For calculation of the insertion loss of HVAC system elements, NEBB experimental data and plane wave theory are used. And in order to obtain the flow rate information in each HVAC elements which is used to calculate the flow induced noise calculation, Global Converging Newton-Rapson Method is used.

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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.

Dynamic Analysis of HVAC Case for Passenger Car (승용차용 HVAC Case의 동특성 해석)

  • Yook, Ji-Yong;Cha, Yong-Kil;Lim, Jung-Su;Kim, Kwang-Il;Kang, Sung-Ho
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.19 no.1
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    • pp.101-108
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    • 2009
  • This paper presents dynamic analysis of HVAC(heating ventilation & air conditioning) heater case which consists of heater and evaporator unit for passenger car. To analyze the dynamic characteristics of HVAC heater case, finite element model which consists of shell elements is constructed for modal analysis and experimental modal analysis has been conducted. Finite element analysis results are compared with experimental results to evaluate of validity of finite element model. After identifying mode shape and natural frequency of HVAC heater case, local stiffness of HVAC case is evaluated through point mobility using finite element analysis and experiment.

3D BIM-based Building Energy Efficiency Solution for Carbon Emission Reduction (탄소저감을 위한 3D BIM 기반 건물 에너지 효율화 방안)

  • Lee, Dong Hwan;Kwon, Kee Jung;Shin, Ju Ho;Park, Seunghee
    • Journal of The Korean Society of Civil Engineers
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    • v.33 no.3
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    • pp.1235-1242
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    • 2013
  • This study deals with the BIM (Building Information Modeling)-based energy performance analysis implemented in EnergyPlus. The BIM model constructed at Revit is updated at Design Builder, adding HVAC models and converted compatibly with the EnergyPlus. We can obtain the input values about HVAC system and building environment such as HVAC system efficient, the number of air changes and energy consumption of equipment on applying GAs (Genetic algorithms). After modification about HVAC system, Optimization about HVAC system energy consumption can be analyzed. In order to maximize the building energy performance, a genetic algorithm (GA)-based optimization technique is applied to the modified HVAC models. Throughout the proposed building energy simulation, finally, the best optimized HVAC control schedule for the target building can be obtained in the form of "supply air temperature schedule". Throughout the supply air temperature schedule is applied to energy performance simulation, we obtained energy saving effect result on simulation.

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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    • 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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PIV Measurement of Flow Inside an Automotive HVAC Module with Varying Temperature Baffle (온도조절 격판 변화에 따른 차량용 HVAC 내부 유동의 PIV속도장 측정 연구)

  • Ji, Ho-Seong;Lee, Sang-Joon
    • Journal of the Korean Society of Visualization
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    • v.6 no.1
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    • pp.27-33
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    • 2008
  • Air flow inside an automotive HVAC module has been investigated using a high-resolution PIV technique with varying the temperature operation mode. The PIV system consists of a 2-head Nd:YAG laser (125 mJ), a high-resolution CCD camera (2K$\times$2K), optics and a synchronizer. A real automotive HVAC module was used directly under real operating condition. Some casing parts of the HVAC module were replaced with transparent windows for capturing clear flow images with laser light sheet beam illumination. Time-averaged velocity fields were obtained for two different temperature control modes. Flow characteristics of the air-conditioned air flow inside the automotive HVAC system for the two temperature baffle conditions were evaluated.

Dynamic Analysis of HVAC Case for Passenger Car (승용차용 HVAC Case의 동특성 해석)

  • Yook, Ji-Yong;Cha, Yong-Kil;Lim, Jung-Su;Kim, Kwang-Il;Kim, Sung-Ho
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.378-384
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    • 2008
  • This Paper presents dynamic analysis of HVAC(Heating Ventilation & Air Condition) Heater Case which consists of heater and evaporator unit for passenger car. To analyze the dynamic characteristics of HVAC Heater Case. finite element model which consists of shell elements is constructed for modal analysis and experimental Modal analysis has been conducted. Finite element analysis results are compared with experimental results to evaluate of validity of finite element model After identifying node shape and natural frequency of HVAC Heater Case, local stiffness of HVAC Case is evaluated through point mobility using finite element analysis and experiment.

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