베네시안 블라인드가 적용된 창호 시스템의 1차 투과율 평가를 위한 EnergyPlus 알고리즘과 DIN EN 13363-2의 분석에 관한 연구

김동균(Kim, Dong-Kyun),전종욱(Jeon, Jong-Ug),김강수(Kim, Kang-Soo) 대한건축학회 2011 대한건축학회논문집 Vol.27 No.11

Recently, the matter of excessive cooling load in buildings is being occurred in summer. This problem is mainly due to uncontrolled solar radiation transmitted to building envelope. To control transmitted solar radiation, shading devices are generally used in buildings. Among shading devices, venetian blind has the advantage to adjust indoor comfort and visual comfort by slat angle control. This paper is focused on comparisons of calculation methods for solar transmittance, which is used in EnergyPlus and DIN EN 13363-2 for thermal simulation of venetian blind combined with glazing. Generally, total solar transmittance is calculated through correlations of glazing transmittance and venetian blind transmittance. EnergyPlus considers angular dependance for calculating glazing transmittance, and it uses Radiosity Method for blind transmittance calculation. However, DIN EN 13363-2 assumed normal incident angle for glazing transmittance and it uses different method for calculating blind transmittance, which is more simplified than EnergyPlus. Consequently, EnergyPlus algorithms demand more detailed information than DIN EN 13363-2 to calculate solar transmittance of glazing system. Furthermore, EnergyPlus always had higher blind transmittance than that of DIN EN 13363-2, due to consider of inner reflection for venetian blind, However, DIN EN 13363-2 always had higher glazing transmittance than EnergyPlus, because it assumed normal incident angle. As a result, they show similar results for total solar transmittance of glazing system.

건축물 에너지 통합지원시스템을 위한 저에너지 건축물 및 기술, 에너지 성능 통합 DB 구축

김철호(Kim, Chul-Ho),이승언(Lee, Seung-Eon),김강수(Kim, Kang-Soo) 한국건축친환경설비학회 2019 한국건축친환경설비학회 논문집 Vol.13 No.3

We built a database of high-performance buildings and energy-saving technologies of the domestic and foreign countries. Futhermore, we selected major energy-saving technology from high-performance building and technologies DB. Energy-saving technologies comprising 15 cases were categorized into passive, active, and renewable energy systems. We analyzed the contribution of each technology in reducing the primary energy consumptions by using EnergyPlus v9.1.0 dynamic simulation tool. The structuring of the high-performance buildings and energy-saving technologies database, part of the “Development of building energy integrated support system for the spread of low-energy building”, will facilitate web-based database searches and help users increase their understanding of high-performance buildings and energy-saving technologies as well as improve their knowledge level. It will also contribute to the Korean government’s reduction of greenhouse gas emissions in the building sector and the improvement of building energy performance in Korea through the analysis of the effects of building energy such as primary energy consumption and energy savings strategies.

에너지 플러스를 이용한 이중외피 시뮬레이션 결과와 실제 비교

김덕우(Kim Deuk-Woo),박철수(Park Cheol-Soo) 한국건축친환경설비학회 2010 한국건축친환경설비학회 학술발표대회 논문집 Vol.2010 No.3

During the last several decades, double-skin systems have been widely introduced. Double-skin systems have advantages of reduction of asymmetric thermal discomfort, energy savings, glare avoidance, etc. Nowadays, several whole building simulation tools (esp-r, EnergyPlus, TRNSYS, TAS, IES VE, IDA ICE, VA114, BSim, etc.) are used for assessment of thermal and energy performance of Double Skin Facade (DSF) buildings. The aforementioned tools are well-posed for energy performance assessment of conventional systems & buildings but there is an ‘accountability’ issue whether such tools can accurately describe the transient heat and mass transfer phenomena occurring in the complex 3D geometry of DSFs. The paper describes an empirical comparison of EnergyPlus results with measurement. A series of experiments were conducted (open cavity, closed cavity for airflow and thermal simulation). In the paper it is shown that the EnergyPlus simulation model is accurate enough for thermal modeling, but there is significant difference in cavity airflow between the measurement and simulation prediction. The paper aims to investigate what causes such difference and what should be considered in modeling of DSF when using the EnergyPlus tool.

A Study on analyze of energy saving rate by retrofitting multi air-conditioner from conventional type to high efficient type using Energyplus

서정식(Seo, Jeongsik),김욱중(Kim, Ook Joong),우정태(Woo, Juntae),최연성(Choi, Younsung),전종욱(Jeon, Jongog) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11

The objective of this study is to analyze the energy saving rate by retrofitting multi air conditioner from conventional type to high efficient type using Energyplus 4.0 which was developed for simulating a building energy by D.O.E. Generally, Multi air conditioner system was installed for both the cooling and the heating in a building. However, it was difficult to estimate the energy saving rate in the case of retrofitting multi air conditioner from conventional type to high efficient type. In the present study, annual energy consumptions of them were evaluated for same building and climate condition.

군사시설 내 지열 히트펌프 시스템 적용에 따른 에너지 성능과 비용 절감 효과 평가

손병후,조경주,조동우,손병후 한국 지열 · 수열에너지학회 2022 한국지열에너지학회논문집 Vol.18 No.4

The Ministry of National Defense of the Republic of Korea is showing a lot of interest in net zero-energy buildings (NZEBs) to reduce energy consumption of military facilities and to promote green growth policy in military sector. The application of building passive technologies and renewable energies is essential to achieving NZEBs. This paper analyzed energy performance and energy cost on the conventional heating and cooling system (baseline scenario) and three different alternative scenarios (ALT 1, ALT 2 and ALT 3) applied in a hypothetical military building. A building modeling and simulation software (DesignBuilder V6.1) with EnergyPlus calculation engine was used to calculate the energy consumption for each scenario. Overall, when the GSHPs are applied to both space airconditioning and domestic hot water (DHW) production, Alt-2 and Alt-3, the amount of energy consumption for target building can be greatly reduced. In addition, when the building envelope performance is increased like Alt-3, the energy consumption can be further reduced. The annual energy cost analysis showed that the baseline was approximately 161 million KRW, while Alt-3 was approximately 33 million KRW. Therefore, it was analyzed that the initial construction cost increase could be recovered within about 6.7 years for ALT 3. The results of this study can help decision-makers to determine the optimal strategy for implementing GSHP systems in military buildings through energy performance and initial construction cost assessment.

제로에너지 구현을 위한 저에너지 설비시스템의 EnergyPlus 기반 에너지 성능 민감도 분석

김철호(Chul Ho Kim),이광호(Kwang Ho Lee),이승언(Seung Eon Lee),김강수(Kang Soo Kim) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.11

In this study, we analyzed the energy sensitivity of energy-saving HVAC systems using the EnergyPlus v 9.1 dynamic simulation program. The energy sensitivity of each low-energy facility system and of each renewable energy system can be evaluated and used as a basis for determining energy-saving systems. The results showed that about 27.7%―59.5% of energy consumption could be reduced through air-conditioning systems and approximately 26.2%―62.4% energy could be saved through plant systems. In addition, the saving rate of renewable energy systems was evaluated to be 86.3%. In order to realize the zero energy of buildings, it is necessary to save as much energy as possible through an HVAC system that is suitable for the characteristics of the building and the climate, and with appropriately connected renewable energy such as PV systems.

EnergyPlus을 이용한 내단열, 외단열 공법의 열류 해석

박재중(Jaejoong Park),김재형(Jaehyung Kim),송두삼(Doosam Song) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11

In this study, heat transmission characteristics between internal and external insulation system were analyzed by energy simulation program-EnergyPlus. Even though, there are differences between internal insulation and external insulation in heat transmission properties, some building load calculation methods cannot account these differences. Also, the behavior of heat transmission of the wall may be different according to the analytical methods such as conduction transfer functions (CTF), conduction finite difference (ConFD). In this paper, as a simulation tool, the heat transmission characteristics of EnergyPlus were analyzed in case of the insulation is installed inner or outer side of the wall. As a result, the thermal storage effect of time-lag effect in wall system was reflected by EnergyPlus.

단독주택 건물 그린리모델링에 따른 건물 에너지 성능과 운전비용 절감 효과 평가

손병후,손병후,이수인,강재식 한국 지열 · 수열에너지학회 2023 한국지열에너지학회논문집 Vol.19 No.4

The Government the Republic of Korea is showing a lot of interest in net zero-energy buildings (NZEBs) to reduce energy consumption of buildings and to promote green growth policy in construction sector. The application of building passive technologies and renewable energies is essential to achieving NZEBs. Green remodeling reinforced the insulation of the exterior walls and roofs of the buildings and replaced high-efficiency windows and doors. In this study, the energy performance before and after green remodeling applied in a detached house was comparatively analyzed for baseline scenario and three different ones, ALT 1, ALT 2 and ALT 3. A building modeling and simulation software (DesignBuilder V7.0) with EnergyPlus (V9.4) calculation engine was used to calculate the energy demand and energy consumption for each scenario. Based on the calculation results of the building's energy demand for baseline, it was determined that the target building required more heating energy than cooling energy. The simulation results also showed that the implementation of building envelope performance improvement technologies (ALT 1) could notably decrease the heating energy consumption of the building. After the remodeling (ALT 1), the source energy consumption per unit floor area was assessed to be reduced by 65.2%, compared to prior remodeling of 338.7 kWh/m2 -y. Meanwhile, ALT 2 can achieve energy savings of 67.7% and ALT 3 can achieve savings of 73.1%. Following completion of the remodeling project, actual construction costs, and on-site measurements and verification results will be gathered and compared with the simulation results. Additionally, economic analysis including construction costs and payback period will be conducted using actual site data.

EnergyPlus의 시뮬레이션 결과와 실제 냉방에너지 사용량의 비교 분석 및 GHP와 EHP의 에너지 성능비교에 관한 연구

김동균(Kim Dong-Kyun),전종욱(Jeon Jong-Ug),김강수(Kim Kang-Soo) 대한건축학회 2011 대한건축학회논문집 Vol.27 No.5

This paper is focused on the energy performance evaluation of Gas Engine Driven Heat Pump (GHP) and Electric Heat Pump (EHP) in accordance with the conversion factors for primary energy and secondary energy. Generally, primary energy of gas consumption is lower than that of electric consumption due to different conversion factors. For this study, we measured actual energy consumption for a target building in which GHP was installed with outdoor unit as HVAC system. The measured data was compared with simulated results from EnergyPlus developed by Department of Energy in USA. As a verifying results, the mean bias error and the root mean squared error of gas consumption were -0.19% and 10.5%, respectively. When we applied electric charge for general building, the cooling operating cost of the EHP was more expensive than that of the GHP in the building. However, operating cost of EHP showed lower than operating cost of GHP when we applied electric charge for the educational building due to reduced charge in accordance of building purpose. Even though the primary energy use of EHP was more used than that of GHP by 27.2%, secondary energy of GHP was higher than that of EHP by 42.6%, because the EHP has high-performance of COP 3.59 compared with the GHP performance of COP 1.13. Therefore, it is desirable to use gas for cooling energy of in a target building for primary energy.

EnergyPlus와 eQUEST를 이용한 공동주택의 난방에너지소비량 비교분석에 관한 연구

박두용(Park, Doo-Yong),윤갑천(Yoon, Kap-Chun),김강수(Kim, Kang-Soo) 한국태양에너지학회 2013 한국태양에너지학회 논문집 Vol.33 No.1

Energy consumption analysis of multi-family apartment is an important area of research for the design of energy-saving housing. In this study, we selected a universal type of Flat-type apartments and analyzed the heating energy consumption of variables such as U-value, G-value, infiltration rate, heating setpoint and boiler efficiency with EnergyPlus and eQUEST. With these results, we identify the characteristics of EnergyPlus and eQUEST and provided base data for the design of energy-saving housing. The results indicate that infiltration rate is the most important factors to consider. And eQUEST heating energy consumption is approximately 10% higher compared to the EnergyPlus under same condition.