• Title/Summary/Keyword: floor heating

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Conceptual Directions of Village Community Center into a Rural Elderly's Welfare Service Space in Chonbuk Province (농촌 마을회관의 노인 복지서비스 공간으로의 활용 방안 - 평면과 이용행태 분석을 중심으로 -)

  • Choi, Byungsook;Park, Sunhee;Oh, Chanok;Hong, Chansun;Im, Sangbong
    • Journal of the Korean Institute of Rural Architecture
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    • v.8 no.2
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    • pp.80-93
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    • 2006
  • This purpose was to explore various directions of elderly service welfare space in village community center. Data were collected 3 types that floor plans of village community centers from 24 villages, interview data of these centers use and needs from 24 aged leaders or 96 elderly. The results were as followed: 1) The floor plans of more than 50% was type IV that was composed a basic spaces(entrance, living room, two rooms, kitchen), a toilet space, a heating system space and a storage space. This type was a current basis of the rural village community centers for elderlies. 2) Elderlies used the centers at winter or out of agricultural season, and visited these to pass the time and to promote friendship among them. 3) Also they went these to take a meal together and to save down personal heating expenses. Their needs for centers were a temporary share dwelling space at winter, a maintain social relationship throughout a health, a education and a side work activity, supplying health or sports facilities, and setting up toilet space. Therefore the current centers were needed to add functions of a temporary share dwelling, a energy saving heat system and a social promoting relationship, and so these could be represented to a elderly welfare service center in rural villages.

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A Study on Change in Window Transmitted Solar and the Resultant Wall Surface Convective Heat Gain with Regard to Slat Reflectance of External and Internal Blinds (실내·외 블라인드의 Slat 반사율에 따라 창호 일사투과량 및 그에 따른 벽체 대류열획득량 분석)

  • Hyun, In-Tak;Lee, Jae-Ho;Yoon, Yeo-Beom;Lee, Kwang Ho
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.26 no.12
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    • pp.565-571
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    • 2014
  • Nowadays, to make buildings light weight and aesthetically pleasing, curtain wall structure are commonly used. Therefore, window to wall ratio is increasing, which has caused cooling and heating load in crease in buildings as well. This phenomenon has negative impact from energy point of view. This paper analyzes window and wall convective heat gain when the slat reflectance of external and internal blinds are changed for the better understanding of the fundamentals behind the phenomena. It was observed that, if slat reflectance is increased, window transmitted solar increases and convection heat rate is clearly affected. Among six surfaces including four walls, ceiling and floor, maximum convection heat rate occurs on the south wall in summer. On the other hand, ceiling and floor showed the lowest convection heat gain, since they are shared by adjacent floors.

Experiment on the Feasibility of Cleaning Building Pipelines using Ultrasonic Cavitation

  • Jo, Jae-Hyun;Lee, Ung-Kyun;Kim, Jae-Yeob;Lee, Sungchul;Kim, Kukhyun
    • International conference on construction engineering and project management
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    • 2022.06a
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    • pp.295-303
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    • 2022
  • Residential heating systems in South Korea are largely based on the use of ondol pipelines. Heat is transferred to the floor by passing hot water through a metal or plastic pipe buried within the concrete of the floor. Consequently, it is difficult to clean the inside of these pipes after installation. Over time, foreign substances such as scale accumulate in the pipe when the ondol heating method is used for an extended period. Therefore, in the past, pipes were cleaned by removing foreign substances attached to the inside surfaces of the pipes using high-pressure water or by disassembling the pipes and removing foreign substances with chemical agents. Recently, a method for removing foreign substances through the cavitation effect of ultrasound has been proposed. This idea might lead to the development of new technologies for cleaning pipe interiors. Consequently, this study investigated the use of ultrasound to clean pipes embedded in concrete. In this study, devices that generated ultrasonic waves with various frequencies and directions were prepared. After preparing arbitrarily contaminated pipes, the appropriate frequency, output strength, and output direction for each foreign substance were determined through repeated experiments. The results of this experiment could provide important information for future methods of cleaning the interior of ondol piping systems.

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A Study on the Supply Process of Unit Modular Housing through a Comparison of Cases

  • Kim, Kyoon-Tai;Jun, Young-Hun;Kim, Tae-Yeong
    • International conference on construction engineering and project management
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    • 2015.10a
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    • pp.411-414
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    • 2015
  • The purpose of this study is to conduct a comparative analysis between Korea and the United States of the supply process of unit modular housing at both the factory production phase and the transportation and lifting phase, as part of an attempt to invigorate the unit modular housing market in Korea. Unlike the practice in the United States, one of Korea's unique characteristics is that the floor is constructed with reinforced concrete and hot water heating system. To do this, the wet method in Korea is used that includes concrete placement, curing and constructing hot water floor heating system at the factory production phase, which results in a longer production time and also requires the lifting of heavier loads. In the United States, interior and exterior finishing works of modular housing are performed by different companies, and the distance between the unit module factory and the construction site is quite far. This kind of dualized production structure may cause confusion when it comes to schedule management, procurement management, and stock management. Moreover, problems caused by external environmental factors such as wind and rainfall were reported in the course of long-distance transportation. The results of this case comparison are expected to provide fundamental data that will reduce the amount of trial and error in the unit module production, transportation and lifting work in Korea, which has a comparatively small number of unit modular housing cases.

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A Comparative Study of Housing Culture of Korean Immigrants through Analysis of Living Arrangement in Australia and Canada (해외거주 한인의 주공간 사용 및 주생활 분석을 통해 본 주거문화의 비교 고찰 - 호주(Australia)와 캐나다(Canada)를 중심으로 -)

  • Lee, Young-Shim
    • Journal of the Korean Home Economics Association
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    • v.46 no.1
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    • pp.47-61
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    • 2008
  • The purpose of this study is to provide information about domestic living of Korean immigrants in Australia and Canada who have the same cultural background for comparative study. For this, usage of domestic space and living style in housing of 52 Korean households in Melbourne of Australia and 32 Korean households in the region of Waterloo of Canada were analyzed. Ethnographic research with questionnaire were used. Results of the research were as follows. 1. Korean immigrants in each countries were living in houses which was built by company of Australia and Canada. 44.2% of Korean immigrants in Australia were using L+D K and 53.1% of Korean immigrants in Canada were using L D K. 2. Laundry was indispensable for Korean immigrants in both countries and they all wanted to use the laundry as a utility room which could dry, ironing and so on. 3. Drain hole on the floor of the bathroom was not indispensable for most Korean immigrants in both countries for hygienic reason. 4. Korean immigrants in both countries were ironing in master bedroom and they all wanted to separate it from there through renovation and extension and so on. 5. Korean immigrants in Canada were more active to use the formal lounge which has been planned as a traditional element of western house. 6. The seating style of Korean immigrants in both countries belong to chair-seating style mostly. But it was clear that they were making Kimchi with floor seating style in both countries. 7. A level of satisfaction about using carpet was not high for Korean immigrants in both countries cause of uneasiness to clean and it was considered to relate to the floor seating style of them. 8. Almost Korean immigrants were took off the shoes inside of the house and they had shoes cabinet beside the entrance or basement usually. 9. The most popular heating system was ducted heating in both countries. The level of satisfaction about this was different for Korean immigrants in Australia and Canada but most desirable heating system was Ondol for them in both countries commonly.

A Study on the Thermal Comfort Zone and Energy Use of Radiant Floor Heating by Residential Style and Clothing Level (생활특성과 착의량에 따른 바닥복사난방 공간의 열쾌적 범위 및 에너지 사용량에 관한 연구)

  • Kim, Sang-Hun;Chung, Kwang-Seop;Kim, Young-Il
    • Journal of Energy Engineering
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    • v.24 no.1
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    • pp.24-31
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    • 2015
  • The purpose of this study is to provide the thermal comfort range according to the residential style and clothing level at radiant floor heating space, and compare the annual energy consumption and energy cost for each condition. Lower neutral point temperature has been stood for floor sitting style than chair sitting style, which appears that the thermal sensation was affected by local heat transfer between floor surface and the human body. The result of research indicates that neutral point temperature was in inverse proportion with the clothing level. It is interpreted that the increasing of clothing level results decrement of heat loss from human body, and is available to achieve same thermal comfort at lower room temperature. It was analyzed that the floor sitting style is more economical residential style than the chair sitting style, because the energy consumption of the floor sitting style is saved by 6.0% in average to compare with that of the chair sitting style. It is analyzed that energy consumption has been decreased by 13.5% with the clothing level of 1.2 Clo than with that of 1.0 Clo, and decreased by 18.0% than with that of 0.8 Clo, which explains that the energy saving can be achieved with the variation in life habit to increase the clothing level.

A Study on the Maintenance Cost Estimation Model of the Apartment Housing (공동주택의 관리비 추정모델 연구)

  • Lee, Kang-Hee;Yang, Jae-Hyuk;Chae, Chang-U
    • Journal of the Korean housing association
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    • v.21 no.2
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    • pp.59-67
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    • 2010
  • The maintenance cost plays a important role to plan the scale of the apartment housing such as a number of household, building area and building type. Therefore, it is required to forecast the cost considering various maintenance characteristics. The maintenance characteristics are floor area, number of household, heating type, site area and etc.. In addition, the maintenance cost are classified into 5 area. These are a personal expense, facility maintenance cost, energy and water cost, insurance and sanitary cost. These five cost area are related with various characteristics and brought up the estimation model using the stepwise multiple regression analysis. The energy and heating cost share over the 50% in the total cost and the personal expense cost shares about 40%. The personal expense cost per area is 5,272 won/$m^2{\cdot}yr$ irregardless of heating type and the district heating type is a higher cost than other type. In facility maintenance cost, the central heating type is 2,015 won/$m^2{\cdot}yr$ and higher than other type. The estimation models have good statistics in each model. Most of the model have a determination coefficient over 0.7 and Durbin Watson value between 1.5 and 2.5.

Performance Prediction of a Hot Water Supply and Panel Heating System with Solar Energy (태양열 온수 및 난방 일체형 복합시스템의 성능예측)

  • Han, Yuri;Park, Youn Cheol
    • Journal of the Korean Solar Energy Society
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    • v.32 no.5
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    • pp.11-17
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    • 2012
  • In this study, a simulation program was developed with heat transfer model in the thermal storage tank for a solar collector and burner combined heating and hot water supply system. Analysis was conducted with variation of operating condition and schedule to analyze performance of a hot water supply and panel heating system with a solar collector and burner combined thermal storage tank. The simulation program is divided two sections. One part is calculation of temperature variation of water which flows through the panel in the floor for heating of the residential house during 24 hours, and the other part is heat transfer calculation for the reaction time to get desired water temperature in the thermal storage tank. As results, light oil consumption and system performance during operation period were analyzed with variation of climate condition and with or without solar collector. Most of the case, oil could be saved about from 24 to 41% with installing the solar collector. The performance of the system is more dependent on radiation time of the solar collector rather than the intensity of the solar radiation which was adopted for the climate analysis.

A Study on Prediction of Power Consumption Rate of Middle School Building in Changwon City by Regression Analysis (회귀분석을 통한 창원시 중학교 전력소비량 예측에 관한 연구)

  • Cho, Hyeong-Kyu;Park, Hyo-Seok;Choi, Jeong-Min;Cho, Sung-Woo
    • The Journal of Sustainable Design and Educational Environment Research
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    • v.12 no.2
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    • pp.61-70
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    • 2013
  • As the existing school building power consumption is expressed by total power consumption, in the view of energy saving is disadvantage. The the power consumption of school building is divided as cooling, heating, lighting and others. The cooling power consumption, heating power consumption, lighting power consumption can be calculated using real total power consumption that gained from Korea Electric Power Corporation(KEPCO). The power consumption for cooling and heating can be calculated using heat transmittance, wall area and floor area, and for lighting is calculated by artificial lighting calculation. but this calculation methods is difficult for laymen. This study was carried out in order to establish the regression equation for cooling power consumption, heating power consumption, lighting power consumption and other power consumption in school building. In order to verify the validity of the regression equation, it is compared regression equation results and calculation results based on real power consumption. As the results, difference between regression result and calculation results for cooling and heating power consumption showed 0.6% and 3.6%.

Performance Analysis of Ground-Coupled Heat Pump System with Slinky-Type Horizontal Ground Heat Exchanger (수평형 지열 히트펌프 시스템의 냉난방 성능 분석)

  • Sohn, Byong-Hu
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.24 no.3
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    • pp.230-239
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    • 2012
  • Ground-coupled heat pump (GCHP) systems utilize the immense renewable storage capacity of the ground as a heat source or sink to provide space heating, cooling, and domestic hot water. The main objective of the present study is to investigate the cooling and heating performance of a small scale GCHP system with horizontal ground heat exchanger (HGHE). In order to evaluate the performance, a water-to-air ground-source heat pump unit connected to a test room with a net floor area of 18.4 m2 and a volume of 64.4 m3 in the Korea Institute of Construction Technology ($37^{\circ}39'N$, $126^{\circ}48'E$) was designed and constructed. This GCHP system mainly consisted of slinky-type HGHE with a total length of 400 m, indoor heat pump, and measuring devices. The peak cooling and heating loads of the test room were 5.07 kW and 4.12 kW, respectively. The experimental results were obtained from March 15, 2011 to August 31, 2011 and the performance coefficients of the system were determined from the measured data. The overall seasonal performance factor (SPF) for cooling was 3.31 while the system delivered heating at a daily average performance coefficients of 2.82.