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온돌난방공간(溫突暖房空間)의 내표면(內表面) 대류열전달특성(對流熱傳達特性)에 관(關)한 연구(硏究)
손장열,안병욱,Sohn, J.Y.,Ahn, B.W. 대한설비공학회 1991 설비공학 논문집 Vol.3 No.5
The purpose of this paper is to propose basic data on convection heat-transfer coefficients in Ondol-heated room. Surface temperatures and several temperatures around each inside surface of wall, floor and ceiling composed of heating room are measured vertically in Ondol-heated model rooms, and the vertical temperature profiles could be expressed by nonlinear equation models. Also, the convection heat transfer phenomena are analysed from the nonlinear equation models. In the results, the convection heat-transfer coefficients of Ondol heated space are suggested by the term of temperature difference between each wall surface and room air temperature and by the relationship between Nusselt number and Rayleigh number of dimensionless numbers.
손장열,이승언,Sohn Jang-Yeul,Lee Seung-Eon 대한설비공학회 1985 설비저널 Vol.14 No.1
This paper aims to present the basic data to establish resonable building maintenance standards by investigating and analyzing the actual conditions of maintenance for service facilities and the problems due to the situation. The subject buildings of investigation are 10 stories and above off ice buildings in Seoul. The results obtained from this study are as follows. 1. The equipment service life related to air-conditioning system is known as around 9years in case of breakdown maintenance and around 13 years in case of preventive maintenance. 2. The total mechanical room area against the total floor area is $4.40\%$, and the ratio of air-conditioning room area is $1.78\%$ on an average.
온돌면(溫突面)의 방열량(放熱量) 산정방법(算定方法)에 관한 연구(硏究)
손장열,안병욱,방승기,Sohn, Jang Yeul,Ahn, Byung Wook,Pang, Seung Ki 대한설비공학회 1989 설비공학 논문집 Vol.1 No.2
Until recently there was a lack of reliable performance data for the design and operation of Ondol heating systems. This paper presents a calculation method on heat flux from Ondol floor surface. Total heat flux from floor consists of radiation and convection component. In order to analyse the characteristics of both radiation and convection heat flux, each surface temperature is measured and several temperatures near each wall are measured vertically and horizontally in a practical Ondol heating space. Radiation heat flux is calculated and analysed by Gebhart's Absorption Factor Method with the consideration of instantaneous radiant exchanges. Convection heat output is derived from the vertical temperature profiles near floor. The vertical temperature profiles could be expressed by nonlinear regression equation models and convection coefficients could be estimated by the equations. As a result, radiation, convection and total heat flux are suggested by the expression of difference between floor surface and room air temperature.
온돌난방공간(溫突暖房空間)의 내표면(內表面) 복사열전달률(輻射熱傳達率)에 관(關)한 연구(硏究)
손장열,안병욱,신용태,Sohn, J.Y.,Ahn, B.W.,Shin, Y.T. 대한설비공학회 1988 설비저널 Vol.17 No.5
The radiation heat-transfer coefficient is generally used to calculate radiant heat exchange of heating space. The coefficient is evenly adopted in most cases, but it is not correct in actual cases. The purpose of this paper is to grasp the changing aspect of radiation heat-transfer coefficient needed for heating load calculation of radiant heating space. Surface temperatures are measured in an Ondol space, and the coefficients are derived and examined. Gebhart's Absorption Factor Method is used for the calculations of the rates of instantaneous radiant exchange in the room. As the result, it is confirmed that the coefficients are variant according to surface temperatures, and proper coefficients are needed for each of conditions.
수정(修正)빈법(法)에 의한 건물(建物)의 기간(期間) 열부하(熱負荷) 해석(解析)에 관한 비교(比較) 연구(硏究)
손장열,윤동원,이정재,Sohn, J.Y.,Yoon, D.W.,Yee, J.J. 대한설비공학회 1988 설비저널 Vol.17 No.6
The purpose of this paper is to present the fundamental information for setting up more accurate and easier heat loads analysis method by examing and comparing Modified Bin Method with Dynamic loads calculation and Extended Degree Day Method. For this comparison, monthly and annual loads calculation are performed in perimeter zones of model office building in Seoul by the above each Method. The results of Modified Bin Method are approximated to those of Dynamic loads calculation Method, and the correlations of the methods are specifically described in this paper.
공조용(空調用) 열원기기(熱源機器)의 대수분리(臺數分離) 제어(制御)에 관한 연구(硏究)
손장열,김회서,안병욱,신용태,Sohn, J.Y.,Kim, H.S.,Ahn, B.W.,Shin, Y.T. 대한설비공학회 1992 설비공학 논문집 Vol.4 No.1
The purpose of this paper is to provide an efficient method of operating and designing HVAC systems for reasonable energy consumption in building. Accroding to the conditions of indoor temperature and humidity, and the methods of dividing and grouping the capacity of boiler and refrigerator, the amount of their annual energy consumptions is simulated by using an energy analysis program which is developed in this paper, and opatimal design methods of HVAC system are suggested as well.
건물(建物) 외벽(外壁)의 전열특성(傳熱特性) 평가(評價)에 관한 실측(實測) 연구(硏究) - 단열재 위치에 따른 실험용 건물의 겨울철 열특성 평가를 중심으로 -
손장열,윤동원,박재형,Sohn, J.Y.,Yoon, D.W.,Park, J.H. 대한설비공학회 1989 설비공학 논문집 Vol.1 No.3
This paper describes the experimental thermal performance results of four experimental model buildings insulated differently. For the purpose of examining the thermal characteristics of external walls and indoor thermal conditions, four experimental model buildings are constructed as externally insulated, internally insulated, non-insulated &light-weight curtain wall types with different K-values and heat capacities, respectively.<br/> Through the measurements of temperatures at various points and solar insolation, the effects of insulation and heat capacities are evaluated, and the evaluated effects of each experimental model buildings are compared. Hence, the characteristics of temperature profiles, time-lag effects and decrement factors are discovered.