• Research Article

    Evaluation of Thermal Environment and Energy Effect of ESS Room according to Battery Operation

    배터리 운용에 따른 ESS실의 열 환경 및 에너지 영향 평가

    Jung, Dong Eun, Lee, Chanuk, Jin, San, Do, Sung Lok

    정동은, 이찬욱, 진산, 도성록

    ESS (Energy Storage System) stores the generated electricity power and supplies it when it is required. The ESS is attracting attention as … + READ MORE
    ESS (Energy Storage System) stores the generated electricity power and supplies it when it is required. The ESS is attracting attention as a core technology for achieving the smart grid. Accordingly, the demand and importance of ESS are continuously increasing. In addition, the spread of ESS is increasing. However, as the spread of ESS increased, fires are also occurring. To prevent fire, the temperature of the ESS room must be kept stable. To achieve this, a cooling system is installed in the ESS room. However, additional energy consumption may be required contradicting the purpose of ESS operation. Therefore, this study evaluated the ESS thermal environment and energy effect. - COLLAPSE
    30 December 2021
  • Research Article

    Evaluation of the Effect and the Perception Range on Impact Sound Reduction by Installing Floor Mats

    바닥매트류 종류에 따른 바닥충격음 저감량 효과와 저감 인지 범위에 대한 평가

    Yeon, Jun-Oh, Kim, Kyoung-Woo, Kim, Myung-Jun

    연준오, 김경우, 김명준

    The purpose of this study was to satisfy the extent to which the impact sound was reduced when the actual impact force … + READ MORE
    The purpose of this study was to satisfy the extent to which the impact sound was reduced when the actual impact force (sound) was applied to the floor mats in various floor structures of apartment houses and that the impact sound was reduced in each of the 125 Hz and 250 Hz bands. It is an evaluation of whether you did it. It was found that PE floor mats have higher impact sound reduction performance than PU floor mats when actual impact force (rubber hole drop height 40 cm) from the upper part of the wet floor structure of apartment houses. In terms of single number quantities, a maximum impact sound reduction performance of 5 dB was found. Even in the semi-dry floor structure, it was found that PE floor mats secured a maximum of 3 dB of actual impact sound reduction performance. In the double-floor structure, the impact sound reduction performance was found to secure a maximum of 2 dB. As a result of evaluating the perception range (3 dB) after installing floor mats in the wet and semi-dry floor structures, it was found that when installing more than 20 mm of PE material, the residents have a range of 3 dB that can be perceived as ‘the impact sound has been reduced’. Overall, floor mats made of PE were found to have somewhat better performance than floor mats made of PU. In the case of floor mats (Case 11 ~ Case 18) combining various materials, it was found that the impact sound reduction performance recognition range of 3 dB was not secured in the upper part of the double floor structure. - COLLAPSE
    30 December 2021
  • Research Article

    Experimental Study on the Indoor CO2 Concentration Prediction

    실내 이산화탄소 농도 예측을 위한 실험적 연구

    Kim, Hyo-Jun, Lee, Han-Gyeol, Oh, Jae-Seong, Cho, Young-Hum

    김효준, 이한결, 오재성, 조영흠

    The purpose of this study is to develop a theoretical-based indoor carbon dioxide (CO2) concentration prediction model. In addition, a … + READ MORE
    The purpose of this study is to develop a theoretical-based indoor carbon dioxide (CO2) concentration prediction model. In addition, a prototype for predictive model validation was developed and laboratory-based performance evaluation was performed. A CO2 concentration prediction model was developed considering the outdoor air damper opening rate of the air handling unit. A prototype using Arduino and CO2 generator was produced for performance evaluation. And CO2 generator was constructed to simulate CO2 production according to the breathing of occupants. Three scenarios were constructed for the input method of the supply carbon dioxide concentration data, and 27 CASEs were constructed for the change of the input value. As a result of the performance evaluation, the MBE of Scenario 1 was -2.57, 2.02, and -3.84%, respectively, and the CvRMSE was 1.43, 4.08, and 1.02%, respectively. Scenario 2 showed MBE of -9.0, 1.96, and -5.96%, respectively, and CvRMSE of 4.94, 4.99, and 4.69%, respectively. Scenario 3 showed MBE of 3.11, 8.21, and 5.33%, respectively, and CvRMSE of 6.61, 11.38, and 9.07%, respectively. It can be seen that overall good prediction results are shown in all scenarios and CASEs. - COLLAPSE
    30 December 2021
  • Research Article

    Development and Implementation of the Integrated Support System for Building Energy Efficiency

    건축물 에너지 효율화를 위한 건축물 에너지 통합지원시스템 개발 및 구현

    Oh, Su-Hyun, Lee, Seung-Eon, Yu, Ki-Hyung, Shin, Hye-Ry

    오수현, 이승언, 유기형, 신혜리

    To respond to climate change, the world has set greenhouse gas reduction targets and implemented action plans. Various policies are being implemented … + READ MORE
    To respond to climate change, the world has set greenhouse gas reduction targets and implemented action plans. Various policies are being implemented to save energy in buildings. In this study, a public building energy integrated support system was developed, which is a web-based comprehensive support system to provide optimal information for building energy efficiency. It also provides customized information, which can assist stakeholders in taking decisions easily. The system consists of a main system and a linked system, and the main system consists of a ‘Comprehensive Information Guide’, ‘Self-Diagnosis of Energy’, and ‘Energy Efficiency Guide’. The ‘Comprehensive Information Guide’ provides basic information on buildings, related policies, and low energy buildings and technologies. ‘Self-Diagnosis of Energy’ compares energy performance levels and provides improvement guides. ‘Energy Efficiency Guide’ simply evaluates energy performance, evaluates user-selected efficiency alternatives, or searches for optimal alternatives. Additionally, System is linked with the Korea registration portal of building materials (K-RBM) and the Korea detailed building energy information system (KDBEIS) (based on in-situ measurements). The developed system was evaluated and supplemented with service usability through alpha and beta tests. - COLLAPSE
    30 December 2021
  • Research Article

    A Study of the Approach to Achieving Energy Self-sufficiency Rate according to Household Density and Heating System in Apartment Complex

    공동주택 주거밀도와 난방방식에 따른 에너지 자립률 달성방안에 관한 연구

    Bang, Sun-Kyu, Yoo, Jung-Hyun, Kim, Ga-Yeon, Yoon, In-Whan

    방선규, 유정현, 김가연, 윤인환

    In this study, in response to the mandatory ZEB certification system, the effect of facility and architectural differences in apartment houses on … + READ MORE
    In this study, in response to the mandatory ZEB certification system, the effect of facility and architectural differences in apartment houses on achieving energy self-sufficiency was analyzed. Firstly, depending on the household density, it was classified into high density, low density and standard. Then, the heating system was divided into Individual Heating, Central Heating and District Heating. In terms of household density, low-density complexes with a small number of households per building and a large number of equal numbers were found to be relatively advantageous. Nevertheless, that fuel cells of 30-50 kWh or higher were required to secure a 5th grade or higher self-sufficiency rate. In order to cope with the mandatory zero-energy building certification system in all heating methods, it was necessary to install a new and renewable energy system, especially in individual heating complexes, it was analyzed that PV installation area of 1,500 m2 or at least twice the rooftop surface should be secured. In most situations, ZEB Grade 5 could be achieved by utilizing additional fuel cells, including PV, but the methods of going to the next grade were all different. This study This study suggests that since apartment complex have various characteristics, several approaches must be considered to achieve ZEB certification. - COLLAPSE
    30 December 2021
  • Research Article

    Comparison of Energy Consumption Depending on the Occupancy-based HVAC Control in a University Campus Building

    재실 기반 설비제어에 따른 대학 건물의 에너지소비량 비교 분석

    Seong, Nam-Chul, Hong, Goo-Pyo

    성남철, 홍구표

    In this study, occupant information, one of the information that can be found in the operation stage of the building, was collected … + READ MORE
    In this study, occupant information, one of the information that can be found in the operation stage of the building, was collected using an actual survey. After converting occupancy data to HVAC system operation schedule, it was analyzed and compared the change of energy consumption applied with occupancy-based HVAC control. As a result, the actual number of occupants was smaller than the case where the occupancy density per area was set, so the energy consumption of the total building decreased by 15.16%, and the energy consumption of the HVAC system decreased by 34.32%. When the occupanct-based HVAC control was applied, the energy consumption of the entire building decreased by 9.71%, and the energy consumption of the HVAC system decreased by 28.42%. As a result of analyzing energy consumption by system, the control of occupancy-based HVAC control has a greater energy saving effect on heating than cooling. The occupancy-based HVAC control is simpler than other controls and has a significant energy saving effect. - COLLAPSE
    30 December 2021
  • Research Article

    Analysis of Fine Dust Reduction Performance of Plant Bio Filter System and Proposal of Optimal Arrangement in School Classrooms using Computational Fluid Dynamics

    전산유체역학을 활용한 식물 바이오필터 시스템의 학교 교실 미세먼지 저감 성능 분석 및 최적 배치 제안에 관한 연구

    Jo, Ye-Lim, Jo, Seong-Min, Choi, Yong-Keun, Sung, Min-Ki

    조예림, 조성민, 최용근, 성민기

    Particulate matter concentration should be reduced because it is likely to deteriorate indoor air quality (IAQ) and human health. In addition, control … + READ MORE
    Particulate matter concentration should be reduced because it is likely to deteriorate indoor air quality (IAQ) and human health. In addition, control of classroom’s IAQ is very important because students spend most of their time at school. Recently, the number of cases of applying bio-wall as a way to remove particulate matter is increasing, but research on optimizing the location of bio-wall is insufficient. Therefore, in this study, the performance of bio-wall was analyzed according to operation of air conditioners, bio-wall’s location and operation using CFD in two classrooms (Class A, B). As a result, when the air conditioner was operated, the removal rate of both classrooms tended to increase, and when the bio-wall was not operated, the removal rate was close to 0%. In addition, removal rate was the highest when a bio-wall was installed in a place where the inlet of the bio-wall directly contacts the air flow of the air conditioner. - COLLAPSE
    30 December 2021
  • Research Article

    An Analysis of Additional Construction Cost for Low Energy Small-Scale Houses

    저에너지 소규모 주택의 추가공사비 분석 연구

    Kwon, Oh-In, Park, Jong-Il, Lee, Dong-Soo, Jung, Ha-Rim, Ji, Chang-Yoon, Choi, Min-Seok

    권오인, 박종일, 이동수, 정하림, 지창윤, 최민석

    According to the national greenhouse gas reduction roadmap, the building sector accounts for a large proportion of greenhouse gas emissions. Among them, … + READ MORE
    According to the national greenhouse gas reduction roadmap, the building sector accounts for a large proportion of greenhouse gas emissions. Among them, small-scale buildings account for about 95% of total building emissions, so it is important to promote low-energy small-scale buildings. This study analyzes the additional construction cost for energy saving elements as part of the value analysis (cost method) for promoting the diffusion of small energy saving small-scale houses. The low energy additional construction cost was analyzed by calculating the general building cost and the low energy house construction cost for 6 energy saving elements: insulation, airtightness, windows, thermal bridge, external electric awning, energy recovery ventilator on 90 passive detached house. As a result, the rate of additional cost increase in 6 energy saving elements was calculated for building types (structure method, area, number of floors). Finally, total construction cost increase rate of low-energy buildings was calculated using the rate of increase in additional construction cost by type for 19 passive houses. - COLLAPSE
    30 December 2021
  • Research Article

    Analysis of Hygrothermal Behavior of External Insulated Lightweight Wooden Structure Considering Water Vapour Diffusion Resistance Factor of Insulation Material

    단열재의 투습저항성능을 고려한 외단열 경량목구조의 습열 거동 분석

    Lee, Jeong-Hun, Park, Jong-Il, Kim, Min-Ju

    이정훈, 박종일, 김민주

    Lightweight wooden structures are continuously being distributed in Korea. According to the recently strengthened insulation standards, the cases of adding external insulation … + READ MORE
    Lightweight wooden structures are continuously being distributed in Korea. According to the recently strengthened insulation standards, the cases of adding external insulation to the 2X6 lightweight wooden structure are increasing, and it was investigated that EPS insulation and glass wool insulation are being used. EPS has a water vapour diffusion resistance coefficient of 50, and glass wool has a coefficient of 1, indicating a large performance difference. Therefore, in this study, the change in moisture load of the lightweight wooden structure wall was analyzed according to the difference in exterior insulation material and the regional climatic conditions. - COLLAPSE
    30 December 2021
  • Research Article

    A Study on the Propriety of a Small Building Cooling and Heating Load Evaluation Program according to the Area Addition Method

    설비영역 방법에 따른 소규모 건축물 냉난방부하평가 프로그램의 적정성 검토

    Jeon, Min-Seok, Lim, Su-Hyun, Park, Sung-Jung

    전민석, 임수현, 박성중

    Reducing the energy required for heating, cooling and air conditioning is a very important factor in reducing overall building energy. Efficient design … + READ MORE
    Reducing the energy required for heating, cooling and air conditioning is a very important factor in reducing overall building energy. Efficient design of building energy, such as estimating the capacity of equipment suitable for the size and purpose of the building, is an important factor to reducing building energy. Accordingly, it is necessary to accurately calculate the heating and cooling load suitable for appropriate size in order to save energy for heating and cooling. However, in the case of small buildings, most of the equipment is selected by converting it into the capacity of the air conditioning equipment per unit area. As mentioned above, equipments are being installed without considering building characteristics such as location, orientation, window area ratio, and thermal transmittance. Therefore, it takes a lot of time to calculate the load, and it takes a lot of time to change the design. For these reasons, this study developed a Heating and Cooling load evaluation program that non-experts can use easily. To verify reliability, this document tried to review the adequacy of the heating and cooling load evaluation by comparing the error with the existing program and examining the error according to the difference in the heating and cooling load evaluation unit. Through the results of this study, it was confirmed that it is possible to induce the appropriate heating and cooling load calculation through developed program that reduces the input items of the building’s envelope. - COLLAPSE
    30 December 2021
  • Research Article

    A Study on Status and Improvement of Airtightness Performance by Year of Low Energy Houses in Korea

    국내 저에너지 단독 주택의 연도별 기밀성능 현황 및 개선방안

    Kim, Sang-Jun, Oh, Dae-Seok, Choi, Jeong-Man, Lee, Jeong-Hun

    김상준, 오대석, 최정만, 이정훈

    To realize low-energy and zero-energy buildings, detailed standards and laws for passive and high-efficiency buildings have been improved, and the airtightness performance, … + READ MORE
    To realize low-energy and zero-energy buildings, detailed standards and laws for passive and high-efficiency buildings have been improved, and the airtightness performance, which affects up to 40% of the building’s cooling and heating load, is becoming increasingly important. In this study, we analyzed the airtightness performance of low-energy houses measured over a period of 10 years. As a result, airtightness performance by year and airtightness performance by building structure were summarized. For those with experience in airtightness construction, the initial and afterwards airtightness performance were compared. In additional the causes and alternatives for the weak point of the airtightness performance that occurred during the airtightness test were summarized. - COLLAPSE
    30 December 2021
  • Research Article

    A Study of the Repeatability and Reproducibility of in-situ Impact Sound Insulation by the Rubber Ball

    고무공 충격원에 의한 현장조건 충격음 차단성능 반복성 및 재현성 고찰

    Kim, Sin-Tae, Lee, Seoung-Bok, Cho, Hyun-Min, Kim, Myung-Jun

    김신태, 이성복, 조현민, 김명준

    In Korea, floor impact sound performance evaluation is performed through bang machine, rubber ball and tapping machine. As for the rubber ball, … + READ MORE
    In Korea, floor impact sound performance evaluation is performed through bang machine, rubber ball and tapping machine. As for the rubber ball, which is heavy &soft impact source, the operator is measuring the performance by free-falling from 1m, so there are concerns about the deviation in the result value. Therefore, a study was conducted to understand the experimental accuracy of the rubber ball that may occur during field measurement, and this study was conducted to analyze the repeatability and reproducibility of the rubber ball under field conditions. As a result of the repeatability test of the rubber ball, there was a difference of less than about 1.2 dB in the measured results for each operator. In addition, the standard deviation of 0.5 dB below 400 Hz occurred in the test results of the same operator. A standard deviation of 0.7 to 2.4 dB occurred in the frequency band above 400 Hz. As a result of the reproducibility test, there was about 1 dB of deviation for each institution depending on the measuring equipment and analysis method. Therefore, it is judged that is necessary to minimize the influence of external noise and to present clear setting conditions for measurement equipment and analysis methods in order to perform on-site measurement on the rubber ball more accurately. - COLLAPSE
    30 December 2021
  • Research Article

    Correlation between Sound Absorption and Heavy Weight Impact Sound according to Installation of Sound Absorbing Material behind the Wall Supported Ceiling System

    벽체지지형 천장 배후 흡음재 설치에 따른 수음실 흡음력 변화와 중량충격음 차단성능 주파수 대역별 상관관계 고찰

    Lee, Seong-Bok, Kim, Sin-Tae, An, Jang-Ho, Kim, Myung-Jun

    이성복, 김신태, 안장호, 김명준

    In this study, the sound field according to the ceiling installation was confirmed by measuring the reverberation time, and the increase of … + READ MORE
    In this study, the sound field according to the ceiling installation was confirmed by measuring the reverberation time, and the increase of sound absorption and the amount of noise reduction were predicted. In addition, predicted noise reduction according to changing reverberation time and measured noise reduction of floor impact sound according to the ceiling installation were compared. Two types of ceiling structure were used, “suspended ceiling” fixed directly to the slab and “wall supported ceiling” fixed to the wall. Porous absorbing material was additionally installed in the “wall supported ceiling”. In a space with a long reverberation time, it was confirmed that the porous sound absorbing material behind the unperforated gypsum board affects the reduction of the reverberation time from 8 s to 2 s at 63 Hz. In a space with a reverberation time of 0.8 to 1.2 s, it was confirmed that the difference in reverberation time according to the installation of the sound absorbing material behind the ceiling was about 0.1 to 0.2 s. The correlation between the floor impact sound reduction according to the increase in sound absorption of sound receiving room by excitation of the bang machine was R2=0.7889, p-value=0.0181 (<0.05) at 63 Hz, which showed a high correlation. This suggests that the improvement of floor impact sound insulation performance in the 63 Hz band can be expected by increasing the sound absorption of the sound receiving room. In addition, it indicates the need for correcting the reverberation time of the sound receiving room when evaluating the heavy weight impact sound insulation performance. - COLLAPSE
    30 December 2021
  • Research Article

    Performance Evaluation of Bypass Heating System to Improve Part Load Efficiency of Individual Room Control Heating System

    실별제어 난방 시스템의 부분부하 효율 향상을 위한 바이패스 히팅 시스템 성능 평가

    Rhee, Kyu-Nam, Song, Jin-Hwan, Ryu, Seong-Ryong

    이규남, 송진환, 류성룡

    In this study, a bypass heating system was suggested to improve the part load efficiency of individual room control for residential heating … + READ MORE
    In this study, a bypass heating system was suggested to improve the part load efficiency of individual room control for residential heating systems. TRNSYS simulation model for the suggested system was developed and heating energy consumption was analyzed to examine the practical applicability. The system was represented with 3-way valves, small circulation pump, and electric heater, which operates under part load condition that water temperature difference becomes less than 10℃. Simulation results showed that the heating energy consumption was reduced by 60% under the aforementioned part load condition. During the whole heating season, the bypass heating system operated for 342 hours, while the operation time of the boiler was reduced by 19.6%. Consequently, heating and pumping energy was reduced by 4.02% and 15.1%, respectively, which resulted in the overall energy saving by 4.12%. - COLLAPSE
    30 December 2021
  • Research Article

    The Analysis of Energy Saving for Domestic Hot Water Using Drain Water Heat Recovery System

    열회수 배수장치의 급탕에너지 절감효과 분석

    Hwang, Seok-Ho

    황석호

    Drain Water Heat Recovery (DWHR) or Waste Water Heat Recovery (WWHR) system is a heat recovery from waste drain water flow and … + READ MORE
    Drain Water Heat Recovery (DWHR) or Waste Water Heat Recovery (WWHR) system is a heat recovery from waste drain water flow and preheat the incoming cold water. This system has been shown to be a viable method of improving the building energy efficiency. This paper investigates the energy saving potential for shower water heat recovery system in residential building. Horizontal system of DWHR was considered because it can be installed under a shower booth and easy access to drain and cold water. The heat energy exchange rate is evaluated using the effectiveness-NTU method. Heat transfer effectiveness was calculated by U-value and area of heat exchanger and drain water flow rate. When a flow rate is 7.5 l/min using heat exchanger has 450 W/m2K U-value and 7 m length, it was possible to save about 20% water heating energy. - COLLAPSE
    30 December 2021
  • Research Article

    The Simplified Method on Building Form to Reduce Input Variables of Building Energy Simulation

    건물 에너지 시뮬레이션 입력 변수 간소화를 위한 건물 형태 간이 평가법

    Park, Hye-Young, Lim, Su-Hyun, Park, Sung-Jung

    박혜영, 임수현, 박성중

    As the scope of use of building energy data has been expanded, a simplified method is proposed to increase accessibility of non-experts … + READ MORE
    As the scope of use of building energy data has been expanded, a simplified method is proposed to increase accessibility of non-experts to building energy analysis and to reduce input variables of building energy simulation. In this study, a method of calculating building shape data such as envelope area and thermal bridge length by substituting a simplified rectangular form with general building information obtained from a register of building or satellite map without measurement was referred to as the “Simplified method”. In order to set the range of necessary general information on buildings, the simplified method was divided into 3 types according to the main variables. The main variables were total floor area, building area, number of floors, height, long side length and short side length. The complexity of the building shape was excluded from the main variables because the difference in the A/V ratio between each building shape was not significant. The error ranges of the envelope area and the thermal bridge length of three simplified methods were analyzed for a building with a total floor area of ​​1,000 m2. As a result, the simplified method was sequentially supplemented from the simplification of the form using the long side length (M1) to that using the ratio of lateral to longitudinal length (M2) and applying an appropriate correction factor (M3). Compared to the envelope area and thermal bridge length of an analysis building with a total floor area of 1,363 m2, the error rates of the simplified method were respectively 5.3% and 2.5%. In the future, additional analysis of application of this simplified method to small-scale buildings where difference in the A/V ratio is large depending on the building shape. - COLLAPSE
    30 December 2021
  • Research Article

    Analysis of Needs of Facility Managers and Local Government Officials for Effective Uses and Management of Indoor Air Quality Information in Multi-use Facilities

    다중이용시설의 실내공기질 정보의 효과적 활용 및 관리를 위한 시설관리자와 지자체 공무원의 요구분석

    Eom, Ye-Seul, Shin, Hee-Won, Kang, Dong-Hwa

    엄예슬, 신희원, 강동화

    The objective of this study was to analyze the facility manager and local government officials’ needs to utilize the indoor air quality … + READ MORE
    The objective of this study was to analyze the facility manager and local government officials’ needs to utilize the indoor air quality (IAQ) information and to manage the IAQ in multi-use facilities. For this purpose, the survey was conducted on 97 managers and 35 officials of child care facilities (CCF), elderly care facilities (ECF), and underground multi-use facilities (UMF). The questionnaire consisted of work information, cognition on IAQ, the preferred method of providing IAQ information, and management status. The results show that the number of managed facilities per official is as high as 64. In the case of management and recording of IAQ measurement by facility, the UMF was the best (92.9%), and the ECF was the lowest at 71.9%. In addition, as for the preferred IAQ information route, the preference for mobile (app and alarm) was high at 49.2%, and the demand for the prevalence of the monitoring system was high at 28.0%. Since the types of pollutants that can be provided and the frequency of information provision are different, it is necessary to select the range of IAQ information for each facility. - COLLAPSE
    30 December 2021
  • Research Article

    Comparison of Indoor Radon Concentrations by Floor Level in a Residential Building

    공동주택의 수직 높이에 따른 실내 라돈 농도 비교

    Kim, Sun-Dong, Lee, Byung-Hee, Chun, Chu-Young

    김선동, 이병희, 전주영

    Radon is a naturally occurring radioactive gas which may be found in high concentrations in indoor environments, such as homes and workplaces. … + READ MORE
    Radon is a naturally occurring radioactive gas which may be found in high concentrations in indoor environments, such as homes and workplaces. The purpose of this study is to investigate the difference in indoor radon pollution level by floor based on the indoor radon concentration in a residential building. To achieve the objective, residential units in domestic apartment complexes were divided into lower, middle, and upper floors, and the indoor radon concentration for each group was measured and compared by using E-PERM and RAD7. During the measurement period, natural ventilation was performed using passive ventilation devices, and experimental errors were minimized by conducting a measuring environment without occupants in the residential unit. As a result of comparing the indoor radon concentration by floor level in a residential building, it was found that the average indoor radon concentration in the upper floors was higher than the average indoor radon concentration in the lower or middle floors. And it was found that the indoor radon concentration in the lower and middle floors gradually increased, while the indoor radon concentration in the upper floors increased or decreased. - COLLAPSE
    30 December 2021
  • Research Article

    Development of a Construction Cost Prediction Model for Retrofit of Net-Zero Energy Building at the Insulation Work Phase

    제로에너지수준의 그린리모델링을 위한 단열공사의 공사비 예측 모델 개발

    Shin, Hye-Ry, Lee, Seung-Eon, Hong, Eun-Bin, Jang, Ye-Eun, Lim, Ji-Youn

    신혜리, 이승언, 홍은빈, 장예은, 임지연

    This study conducted a cost prediction model that minimizes project risk and enables rational decision-making by predicting additional construction costs for insulation … + READ MORE
    This study conducted a cost prediction model that minimizes project risk and enables rational decision-making by predicting additional construction costs for insulation work. The essential factors for building energy efficiency have to evaluate in the early stages of the green remodeling project. Criteria for each building’s semi-performance for green remodeling of zero energy level defined, detailed classification items and standards established, and conditions of five groups categorized according to the semi-performance degree. The prediction model consists of three stages: 1) existing building information, 2) insulation material composition, and 3) construction cost derivation. The construction cost consists of 21 insulation items according to the legal standards of existing buildings, calculates material costs, labor costs, and cost. This prediction model constructed a more substantial construction cost calculation model from the perspective of construction and construction costs is possible to present an optimal construction cost scenario according to options such as semi-performance, structure, and region during green remodeling. - COLLAPSE
    30 December 2021
  • Research Article

    An Application of LSTNet in Deep Learning-based Non-intrusive Load Monitoring Framework

    딥러닝 기반 비침입 부하 모니터링 프레임워크에서의 LSTNet 응용

    Kim, Im-Gyu, Kim, Hyun-Cheol, Shin, Sang-Yong

    김임규, 김현철, 신상용

    In this study, a process of measuring and preprocessing power data for 4 types of home appliances and a deep training-based NILM … + READ MORE
    In this study, a process of measuring and preprocessing power data for 4 types of home appliances and a deep training-based NILM technique were proposed. Active power of 4 types of home appliances (refrigerator, induction, TV, washer) was measured for about 3 weeks. The power data of each home appliance was measured to be aggregated in a smart meter. In order to disaggregate energy using LSTNet, four types of home appliances and smart meter power data were constructed as a training dataset. In the training process, we performed a parametric study to extract the optimal hyperparameter with the highest validation accuracy metric among the major parameters of LSTNet to verify the feasibility of NILM application of LSTNet. - COLLAPSE
    30 December 2021
  • Research Article

    Analysis of the Local Ventilation Effects in a University Classroom Equipped with Ductless Energy Recovery Ventilators

    실내 무덕트형 열회수 환기장치가 구비된 대학 강의실의 위치별 환기 효과 분석

    Park, Seung-Hoon, Jo, Jae-Hun, Kim, Eui-Jong

    박승훈, 조재훈, 김의종

    As an increasing global concern about air pollution, the demand for adequate ventilation is also increasing. In particular, the demand for ductless … + READ MORE
    As an increasing global concern about air pollution, the demand for adequate ventilation is also increasing. In particular, the demand for ductless ERVs equipped with high-efficiency particulate air (HEPA) filters is increasing especially for buildings that were not targets of the mandatory ERV installation when being constructed. There are insufficient research data for the ventilation effects of ductless ERVs that supply the fresh air from single diffusers. The purpose of this study is to measure and analyze the local ventilation effects by measuring indoor CO2 and PM2.5 levels when operating ductless ERVs equipped with HEPA filters in a university classroom. The results show that the local ventilation efficiency according to measuring points can be deviated by 0.26 for CO2 and 0.35 for PM2.5, respectively. Thus, proper locations when installing the ductless ERVs must be carefully selected for ensuring an even distribution of the local ventilation efficiency. - COLLAPSE
    30 December 2021
  • Research Article

    A Study on Simplifying Zoning through Comparison of the Heating and Cooling Energy Demand of Simple Zoning and Detailed Zoning according to the Usage Profile

    용도프로필에 따른 단순 조닝과 상세 조닝의 냉난방 에너지요구량 비교를 통한 조닝 단순화 연구

    Lim, Su-Hyun, Yoon, Hyun-Jung, Park, Hye-Young, Park, Sung-Jung

    임수현, 윤현정, 박혜영, 박성중

    This study presents a method of minimizing the input variables by simplifying zoning when calculating heating and cooling energy demand. This method … + READ MORE
    This study presents a method of minimizing the input variables by simplifying zoning when calculating heating and cooling energy demand. This method was analyzed by comparing the result of the heating and cooling energy demand with the detailed calculation method requiring many input variables for each zone. The errors of the single or simple model to the detailed model in heating and cooling energy demand is analyzed for commercial facilities, business facilities, education & research facilities. As a result, simple model calculation method applying major and sub-usage profile can reduce the number of envelope inputs while providing appropriate results. It could be considered to be a time-efficient method. - COLLAPSE
    30 December 2021
Journal Informaiton Journal of Korean Institute of Architectural Sustainable Environment and Building Systems Journal of Korean Institute of Architectural Sustainable Environment and Building Systems
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