• Title/Summary/Keyword: Solar heating & cooling system

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A Cost Analysis of the Heat Recovery Ventilator under Various Condition (열회수형 환기장치의 운전조건에 따른 경제성 평가에 관한 연구)

  • Kang, Tae-Wook;Koh, Jae-Yoon
    • Journal of the Korean Solar Energy Society
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    • v.26 no.1
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    • pp.21-28
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    • 2006
  • Changes in building construction methods and repairing of older buildings have reduced infiltration rate. Synthetic materials, release airborne particles and uneven healthy odor are increased. For preventing pollutants introduce fresh outdoor air into the building, simply letting fresh outdoor air into building, however, Is not a cost-effective way to ventilation. When additional ventilation is added to an existing HVAC system, the heating and cooling equipment, often cannot handle the increased load. A HRV provides a way to minimize in energy costs while introducing fresh air to a building. In this study, the economical research of HRV, made of three types of materials, are conducted. Heat recovering characteristics are studied at seasonal outdoor air conditions based on the outdoor air property condition at, Seoul in 2002. As a results, the average sensible effectiveness is 0.75 in the sensible heat exchanger and average total effectiveness is 0.65 in the total heat exchanger. The pay back period of the sensible heat exchangers are $3.2{\sim}3.5$ year and it of total heat exchanger is 2.2 years.

Development of a New Refrigerant Mixture (RM-1) to improve the performance of Heat Pump System for Heating and Cooling of the Living Space (생활공간 냉난방용 열펌프의 성능개선을 위한 새로운 혼합냉매(RM-1) 개발)

  • Song, Heon;Ro, Jeong-Geun
    • Journal of the Korean Solar Energy Society
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    • v.31 no.5
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    • pp.67-76
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    • 2011
  • 생활공간 냉난방용 열펌프의 성능향상을 위해 R22의 대체 냉매로서 새로운 혼합냉매R22/R23/R152a(RM-1)을 개발하고 U. S. A.의 NIST사의 REFPRO Pprogram을 이용해 이 혼합냉매의 P-h diagram을 구성하여 실용화에 이용할 수 있도록 하였다. 본 연구는 실험을 통해 R22와 RM-1의 열펌프 성능효과를 분석하였다. 입 출구 물의 온도와 제2의 전열매체로서 물의 질량유량, 압축기의 소요 에너지 그리고 열펌프의 기타 열적 특성을 다양한 조건하에서 측정하였다. 이 실험 데이터를 통해 공기-물 열펌프 시스템에서의 RM-1과 R22의 성능계수(COP)를 비교하였다. 이를 통해, 혼합냉매 RM-1을 사용하는 열펌프 시스템은 외기온 $-17^{\circ}C$에서도 2.2의 성능계수로 작동하는 결과를 본 연구에서 보여주었다.

A Study on the Reference Building based on the Building Design Trends for Non-residential Buildings (건축물 설계현황 분석을 통한 국내 비주거용 표준건물의 설정에 관한 연구)

  • Jeong, Young-Sun;Jung, Hae-Kwon;Jang, Hee-Kyung;Yu, Ki-Hyun
    • Journal of the Korean Solar Energy Society
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    • v.34 no.3
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    • pp.1-11
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    • 2014
  • The Korean government plans to introduce the building energy performance standard which regulates the annual energy consumption of buildings. This paper aimed to set up the reference building from database based on the building design trends for non-residential buildings. We surveyed the design data of 435 non-residential buildings which were granted building permission from 2007 to 2011. And we conducted estimation on the heating & cooling load and the energy consumption of the reference building using ECO2 program. From results, the reference building of non-residential buildings was office building which had a total 7 floors and $20,838m^2$ gross floor area. And it suggests the design reference data of building envelope, HAVC, heat source equipment and lighting system for the reference building. The total annual energy use of the reference building was $151.9kWh/m^2yr$.

The Development of the Calibration Method of Building Energy Consumption by HDDm and CDDm (냉·난방도일에 따른 건물에너지 사용량 보정기법 개발)

  • Kim, Dongi;Lee, Byeongho
    • Journal of the Korean Solar Energy Society
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    • v.38 no.6
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    • pp.15-26
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    • 2018
  • It is difficult to check the exact building energy consumption reduction such as when green remodeling of buildings, because it is due to outdoor air temperature over the years. And in Korea although Big Data of building energy consumption is collected and managed through "The Information System of the Building Energy and Greenhouse Gases" it is underutilized because of non calibration of outdoor air temperature change. Therefore, this study aims to develope calibration method of building energy consumption by outdoor air temperature according to micro climates, and building use types. As a result of analysis, Regression equations of Building energy consumption and $HDD_m/CDD_m$ are derived and calibration method is developed by Regression coefficient.

Comparison study of heatable window film using ITO and ATO

  • Park, Eun Mi;Lee, Dong Hoon;Suh, Moon Suhk
    • Proceedings of the Korean Vacuum Society Conference
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    • 2016.02a
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    • pp.300.2-300.2
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    • 2016
  • Increasing of the demand for energy savings for buildings, thermal barrier films have more attracted. In particular, as heat loss through the windows have been pointed out to major problems in the construction and automobile industries, the research is consistently conducted for improving the thermal blocking performance for windows. The main theory of the technology is reflect the infrared rays to help the cut off the inflow of the solar energy in summer and outflow of the heat from indoors in winter to save the energy on cooling and heating. Furthermore, this is well known for prevent glare, reduces fading caused by harmful ultraviolet radiation and easy to apply on constructed buildings if it made as a film. In addition to these advantages, apply the transparent electrode to eliminate condensation by heating. Generally ITO is used as a transparent electrode, but is has a low stability in environmental factors. In this study, ITO and its alternative, ATO, is deposited by sputtering system and then the characteristic is evaluated each material based thermal barrier thin film. The optical property was measured on wide range of wavelength (200 nm 2500 nm) to know the transparency in visible wavelength and reflectivity in IR wavelength range. The electrical property was judged by sheet resistivity. Finally the changes of the temperature and current of the deposited film was observed while applying a DC power.

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Development of a Building Energy Demand Estimator (건물 단지에 대한 에너지 수요 예측 프로그램 개발)

  • Chung, Mo;Park, Hwa-Choon;Im, Yong-Hoon
    • 한국태양에너지학회:학술대회논문집
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    • 2009.04a
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    • pp.127-132
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    • 2009
  • A Microsoft Access application program is developed to calculate energy demands for a Community Energy System (CES) composed of various types of buildings. The field-measured heating, hot water, cooling, and electricity energy consumptions for 14 types of building are systematically organized in forms of database and hourly loads for a span of year (8760 hours) are generated through an automated statistical procedure. User-friendly standard windows interfaces are provided to assist non-expert end users.

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Present and Future of Green Hospitals in Korea (종합병원의 친환경적 시설 실태와 향후 과제)

  • Seo, Youngjoon;Kang, Shinhee;Kim, Yeon-Hee;Lee, Yong-Gyun
    • Journal of The Korea Institute of Healthcare Architecture
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    • v.16 no.1
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    • pp.43-53
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    • 2010
  • This study purports to investigate the status quo of the environmentally-friendly green healthcare in teaching hospitals through the questionnaire survey. Data were collected from a total of 46 hospitals. The survey results revealed that most teaching hospitals did not meet the global standard of environmentally-friendly green hospitals. Especially, such items as alternative energy system, water recycling, CO2 emission reduction, green building construction, installation of pond or spring were found to be significantly below global standard. Based upon the study results, various strategies for establishing green hospitals were discussed. For example, energy saving design, such as solar heating, natural wind cooling, automatic temperature controller, green material use, wall surrounded by ivy, were recommended. In conclusion, the strategy and evaluation tool developed in the study will provide a good guide for establishing environmentally-friendly green hospitals.

Renovation of Closed School Using Sustainable Method - From Closed School to Artist Studio Complex - (환경친화적인 리노베이션 기법을 적용한 폐교의 재활용 - 폐교를 이용한 복합 예술작업공간 설계 -)

  • Hong, Seung-Shin;Rieh, Sun-Young
    • Journal of the Korean Institute of Educational Facilities
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    • v.9 no.4
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    • pp.95-102
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    • 2002
  • The purpose of this study is to renovate a closed school to a artist studio complex applying sustainable principles and methods. Through the case study, the principle and methods of sustainable renovation is investigated and following strategies are extracted as a frame of renovation. First, atrium space with thermal mass using existing wall is proposed as a public gathering space. Second, light shelves for effective lighting and shading device for protecting and allowing sun light is proposed to renovate existing classroom. Third, double skin system is proposed with reflection pool to activate heating and ventilation for passive solar as well as passive cooling. Finally, simulation programs such as energy-10 and Form-Z is used to confirm the validity of the sustainable design.

A Study on the Thermal Prediction Model cf the Heat Storage Tank for the Optimal Use of Renewable Energy (신재생 에너지 최적 활용을 위한 축열조 온도 예측 모델 연구)

  • HanByeol Oh;KyeongMin Jang;JeeYoung Oh;MyeongBae Lee;JangWoo Park;YongYun Cho;ChangSun Shin
    • Smart Media Journal
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    • v.12 no.10
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    • pp.63-70
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    • 2023
  • Recently, energy consumption for heating costs, which is 35% of smart farm energy costs, has increased, requiring energy consumption efficiency, and the importance of new and renewable energy is increasing due to concerns about the realization of electricity bills. Renewable energy belongs to hydropower, wind, and solar power, of which solar energy is a power generation technology that converts it into electrical energy, and this technology has less impact on the environment and is simple to maintain. In this study, based on the greenhouse heat storage tank and heat pump data, the factors that affect the heat storage tank are selected and a heat storage tank supply temperature prediction model is developed. It is predicted using Long Short-Term Memory (LSTM), which is effective for time series data analysis and prediction, and XGBoost model, which is superior to other ensemble learning techniques. By predicting the temperature of the heat pump heat storage tank, energy consumption may be optimized and system operation may be optimized. In addition, we intend to link it to the smart farm energy integrated operation system, such as reducing heating and cooling costs and improving the energy independence of farmers due to the use of solar power. By managing the supply of waste heat energy through the platform and deriving the maximum heating load and energy values required for crop growth by season and time, an optimal energy management plan is derived based on this.

Thermal Performance of the Storage Brick Containing Microencapsulated PCM (상변화형 미세캡슐을 함유한 축열블럭의 열성능 특성)

  • Lee, D.G.;Chun, W.G.;Kang, Y.H.;Kwak, H.Y.
    • Solar Energy
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    • v.19 no.3
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    • pp.23-28
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    • 1999
  • The thermal performance of storage brick, containing microencapsulated PCM(phase change material), was investigated for utilization as a floor heating system. Sodium acetate trihydrate($CH_3COONa{\cdot}3H_2O$) was selected for the PCM and was encapsulated. The thermal storage brick was manufactured with mixing cement mortar having 10%, 20% PCM contents, respectively. Four different flow rates and three different cooling temperatures was used in this work for analyzing the heat charging and discharging characteristics of the thermal storage brick. The result showed that cycle time was shortened as the PCM content was increased and as the mass flow rate was increased. The same effect was obtained when the cooling temperature was decreased. For each thermal storage brick the overall heat transfer coefficient(U-value) was constant for a 0% brick, but was increased with time for the bricks containing microencapsulated PCM.

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