• Title/Summary/Keyword: Cooling heating energy consumption

Search Result 281, Processing Time 0.024 seconds

Analysis on the Impact of Load Factors in Building Energy Simulation Affecting Building Energy Consumption (에너지시뮬레이션에서의 부하요소가 건물에너지사용량에 미치는 영향 분석)

  • Yoon, Kap-Chun;Jeon, Jong-Ug;Kim, Kang-Soo
    • KIEAE Journal
    • /
    • v.11 no.4
    • /
    • pp.71-78
    • /
    • 2011
  • The goal of this study is to analyze the impact of load factors on building energy consumption by using EnergyPlus program. We selected a campus building and monitored energy consumption from January 2009 to November 2010. First, we simulated energy consumption basically with weather data, building heat gain and EHP performance data. And then we simulated energy consumption with three additional parameter(infiltration, OA control and schedule). Simulation results are verified by MBE and Cv(RMSE) proposed by M&V guideline 3.0. Simulated total energy consumption was 104.3% of measurements, 4.33% of MBE, and 13.62% of Cv(RMSE). Results show infiltration and schedule were revealed as the most dominant factor of heating energy consumption and of cooling energy consumption, respectively.

Study on Energy Performance And Economic Evaluation of Windows System with Built-in Type Blinds (블라인드 내장형 창호시스템의 에너지 성능 및 경제성 평가에 관한 연구)

  • Joe, Won-Hwa;Lim, Nam-Gi
    • Journal of the Korea Institute of Building Construction
    • /
    • v.10 no.2
    • /
    • pp.97-104
    • /
    • 2010
  • This study evaluated the energy efficiency of a windows system using built-in blinds, with regard to their insulation performance and their blocking of solar radiation. The study took advantage of the "Physibel Voltra" program as a physical simulation of heat transfer. To simulate the "Physibel Voltra" program, I practiced a mock-up test to determine heating quality and translation condition. I analyzed the propensity to annual energy consumption, the annual quantity of heat transfer, and the annual cooling and heating cost through a computer simulation for one general household in an apartment building. In the test, it was found that compared to a general windows system, a windows system with built-in blinds reduced the annual heat transfer by 10% in cooling states and by 11% in heating states when the blind was up. When the blind was down, the windows system with built-in blinds reduced the annual heat transfer by 25% in cooling states and 30% in heating states. When a windows system with built-in blinds is compared with a general windows system, the quantity of cooling and heating loads is reduced by 283.3kw in cooling states and 76.3kw in heating states. This leads to a reduction in the required cooling and heating energy of 359.6kw per house. It is thus judged that the use of a windows system with built-in blinds is advantageous in terms of reducing greenhouse gas emissions, because the annual TOE (tons of oil equivalent) per house is reduced by 0.078TOE, while $tCO_2$ is reduced by $0.16tCO_2$. In addition, compared with a general windows system, the cost of cooling and heating loads in the system reduces the annual cooling cost by 100,000won, and the annual heating cost by 50,000won. Ultimately, this means that cooling and heating loads are cut by 150,000won per year.

Improvement Method of Regional Insulation Standard through the Regional Heating Energy Demand Analysis (권역별 난방에너지 요구량 분석을 통한 단열기준 개선방안)

  • Kim, Jeong-Gook;Ahn, Byung-Lip;Jang, Cheol-Yong;Jeong, Hak-Geun;Haan, Chan-Hoon
    • KIEAE Journal
    • /
    • v.13 no.4
    • /
    • pp.43-48
    • /
    • 2013
  • The effect of climate change has influenced humanity and ecosystem with tremendous changes in temperature. For the past 150 years, the national annual average temperature is 0.6 degree increased and the heating degree day reduced from April to November. However, December to January, the climate change was generated and the heating degree day increased. The blackout occured in 2011 and 2012 by increasing electricity consumption of heating and cooling equipment to the effects of climate change. That is because heating load accounted for 20% of building electric use. In this study, strengthening measures to reduce heating energy consumption is presented due to climate change in winter since 1980 to prevent blackout and reliable power supply for the building energy-saving design standards by Meteorological data provided by the National Weather Service were calculated using the heating degree days in order to present eighteen cities from 1980 to 2012. Insulation standards are presented to prevent black-out by the heating degree days. the heating energy demand was reduced almost 6% including 10% in Central, 5% in South and Jeju area based on strengthening of the insulation. It is applied to the entire country an annual economic effect of 250 billion won, and black-out can be prevented.

Performance Prediction on the Application of a Ground-Source Heat Pump(GSHP) System in an Office Building (업무용 건물의 지열 히트펌프 시스템에 대한 성능 예측)

  • Sohn, Byonghu;Kwon, Han Sol
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.26 no.9
    • /
    • pp.409-415
    • /
    • 2014
  • Ground-source heat pump (GSHP) systems have become an efficient alternative to conventional cooling and heating methods due to their higher energy efficiency. These systems use the ground as a heat source and the heat sink for cooling mode operation. The purpose of this simulation study is to evaluate the performance of a hypothetical GSHP system in an office building and to assess the energy saving effect against the existing HVAC systems (boiler and turbo chiller). We collected monthly energy consumption data from an actual office building ($32,488m^2$) in Seoul, and created a model to calculate the hourly building loads with EnergyPlus. In addition, we used GLD (Ground Loop Design) V8.0, a GSHP system design and simulation software tool, to evaluate hourly and monthly performance of the GSHP system. The energy consumption for the GSHP system based on the hourly simulation results were estimated to be 582.6 MWh/year for cooling and 593.2 MWh/year for heating, while those for the existing HVAC systems were found to be 674.5 MWh/year and 2,496.4 MWh/year, respectively. The seasonal performance factor (SPF) of the GSHP system was also calculated to be in the range of 3.37~4.28.

Study on the Simulation of Heat Pump Heating and Cooling Systems to Hospital Building (병원 건물의 히트펌프 냉난방 시스템 적용을 위한 시뮬레이션 연구)

  • Choi, Young-Don;Han, Seong-Ho;Cho, Sung-Hwan;Kim, Du-Sung;Um, Chul-Jun
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.32 no.4
    • /
    • pp.275-282
    • /
    • 2008
  • In Korea, air source heat pump system is less efficient than conventional heat source facilities, because the air temperature in winter season is so low that COP of air source heat pump system drops below 3.0. Therefore, the study on the application of heat pump heating and cooling systems is crucial for the efficient popularization of heat pump. In this work, we present the dynamic analysis of energy consumption for the large hospital building by heat resistance-capacitance method. The system simulation of water storage air source heat pump is additionally performed by changing sizes and locations of the hospital building. The computed results show that energy cost of water storage air source heat pump is low, so it is more economical than absorption chiller & heater.

Real Time Near Optimal Control Application Strategy for Heat Source and HVAC System (열원 및 공조설비 통합 최적제어기법 구현에 관한 연구)

  • Song, Jae-Yeob;Ahn, Byung-Cheon;Joo, Yong-Duk;Kim, Jin
    • Proceedings of the SAREK Conference
    • /
    • 2008.06a
    • /
    • pp.60-65
    • /
    • 2008
  • The near-optimal control algorithm for central cooling and heating system has been developed for minimizing energy consumption while maintaining the comfort of indoor thermal environment in terms of the environmental variables such as time varying indoor load and outdoor temperatures. The optimal set-points of control parameters with near-optimal control are supply air and chilled or hot water temperatures. The near optimal control algorithm has been implemented by using LabVIEW program in order to analyze energy performance for central cooling and heating control system.

  • PDF

Economic Analysis of a Residential Ground-Source Heat Pump System (단독주택용 지열원 열펌프 시스템의 경제성 분석)

  • Sohn, Byong-Hu;Kang, Shin-Hyung;Lim, Hyo-Jae
    • New & Renewable Energy
    • /
    • v.3 no.4
    • /
    • pp.31-37
    • /
    • 2007
  • Because of their low operating and maintaining costs, ground-source heat pump(GSHP) systems are an increasingly popular choice for providing heating, cooling and water heating to public and commercial buildings. Despite these advantages and the growing awareness, GSHP systems to residential sectors have not been adopted in Korea until recently. A feasibility study of a residential GSHP system was therefore conducted using the traditional life cycle cost(LCC) analysis within the current electricity price framework and potential scenarios of that framework. As a result, when the current residential electricity costs for running the GSHP system are applied, the GSHP system has weak competitiveness to conventional HV AC systems considered. However, when the operating costs are calculated in the modified price frameworks of electricity, the residential GSHP system has the lower LCC than the existing cooling and heating equipments. The calculation results also show that the residential GSHP system has lower annual prime energy consumption and total pollutant emissions than the alternative HVAC systems considered in this work.

  • PDF

Function of Home Energy Savings and Carbon Emission Reduction by Urban Vegetation- Case of Chuncheon- (도시식생의 주택에너지절약 및 탄소배출저감 기능 -춘천시를 대상으로-)

  • 조현길;서옥하;한갑수
    • Journal of the Korean Institute of Landscape Architecture
    • /
    • v.26 no.3
    • /
    • pp.104-117
    • /
    • 1998
  • Rising concern about climate change has evoked interest in the potential for urban vegetation to help reduce the level of atmospheric CO\sub 2\, a major heat-trapping gas. This study quantified the functio of home energy savings and carbon emission reduction by shading, evapotranspiration and windspeed reduction of urban vegetatioin in Chuncheon. Tree and shrub cover averaged approximately 13% in residential land. The effects of shading, evapotranspiration and windspeed reduction annually saved heating energy by 2.2% and cooling energy by 8.8%. The heating and cooling energy savings reduced carbon emissions by 3.0% annually. These avoided emissions equaled the amount of carbon emitted annually from fossil fuel consumption by a population of about 1,230. Carbon emission reduction per residential building was 55kg for detached buildings and 872 kg for multifamily buildings. Urban vegetation annually decreased heating and cooling energy cost by ₩1.1 billions, which were equivalent to annual savings of ₩10,000 savings and carbon emission reduction due to tree plantings in the wrong locations, while windspeed reduction had a great effect. Plantings fo large trees close to the west and east wall of buildings, full tree plantings on the north, and avoidance of shade-tree plantings or selection of solar-friendlytrees on the south were recommended to improve the function of building energy savings and carbon emission reduction by urban vegetation.

  • PDF

Energy Saving Strategies for Ice Rink using Sea-Water Heat Source Cooling System (해수열원을 이용한 빙상경기장의 에너지절약 방안에 관한 연구)

  • Kim, Samuel;Park, Jin-Young;Park, Jae-Hong
    • Journal of the Korean Solar Energy Society
    • /
    • v.34 no.2
    • /
    • pp.53-59
    • /
    • 2014
  • Ice Rink is energy intensive building type. Concern of energy saving from buildings is one of very important issues nowadays. New and renewable energy sources for buildings are especially important when we concern about energy supply for buildings. Among new and renewable energy sources, use of seawater for heating and cooling is an emerging issue for energy conscious building design. The options of energy use from sea water heat sources are using deep sea water for direct cooling with heat exchange facilities, and using surface layer water with heat pump systems. In this study, energy consumptions for an Ice Rink building are analyzed according to the heat sources of air-conditioning systems; existing system and sea water heat source system, in a coastal city, Kangnung. The location of the city Kangnung is good for using both deep sea water which is constant temperature throughout the year less than $2^{\circ}C$, and surface layer water which should be accompanied with heat pump systems. The result shows that using sea water from 200m and 30m under sea lever can save annual energy consumption about 33% of original system and about 10% of that using seawater from 0m depth. Annual energy consumption is similar between the systems with seawater from 200m and 30m. Although the amount of energy saving in summer of the system with 200m depth is higher than that with 30m depth, the requirement of energy in winter of the system with 200m depth is bigger than that with 30m depth.

A Study on the Application Effect of DSSC BIPV Window System in Office Building Considering Cooling.Heating.Lighting Energy (냉.난방 및 조명에너지를 통합 고려한 DSSC BIPV창호의 사무소건물 적용 효과 연구)

  • Sim, Se-Ra;Yoon, Jong-Ho;Shin, U-Cheul
    • Journal of the Korean Solar Energy Society
    • /
    • v.31 no.3
    • /
    • pp.67-72
    • /
    • 2011
  • The aim of this study is to evaluate how much would the building energy consumption be saved by applying DSSC BIPV window which is possible to control the transmittance and express the color in the office building. For this, physical characteristics such as transmittance and reflectance, U-factor of DSSC areanalyzed and an annual energy consumption that is connected to dimming control is calculated when DSSC BIPV window is applied by alternate clear window system. As a result, It is possible to reduce the anannual energy consumption as much as4.1% by just change the clear double window system to DSSC BIPV double window system because the major factor to reduce energy consumption in the office that has much cooling load than other building is SHGC. When the thermal insulation properties of DSSC BIPV window with low-e coating and making triple window are improved, energy saving ratio is about 9%. Plus, energy saving ratio of 25~28% in lighting energy consumption is possible when the dimming control system with DSSC BIPV window is adopt.