• Title/Summary/Keyword: Cooling heating energy consumption

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A Case Study on the Design Variables Evaluation of Green Roof System effecting on Building Energy Conservation (건물 에너지 소비량에 영향을 미치는 옥상녹화시스템 설계변수 평가에 관한 사례 연구)

  • Choi, Jeong-Min
    • Journal of the Korean Solar Energy Society
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    • v.35 no.3
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    • pp.41-48
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    • 2015
  • This study is to find out the major design variables of Green roof system effecting on the building energy consumption. Therefore, in three categories of green roof system, namely, foliage layer, soil layer and irrigation, 10 design variables are selected and simulated with one-story case building. Simulation is carried out with Design Builder and EnergyPlus. Finally, it was found out the effects of major variables affecting on the building heating and cooling energy and how they are affecting on the heating and cooling seasons respectively.

A Multiplex Housing Energy Conservation Strategy through Combining Insulation Standard Based Green Roof Systems and Passive Design Elements

  • Son, Hyeongmin;Park, Dong Yoon;Chang, Seongju
    • KIEAE Journal
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    • v.14 no.1
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    • pp.31-38
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    • 2014
  • Recently, the coverage of urban forests has been rapidly decreasing as the cities are created and expanding. Consequently, there arise urban problems such as heat island effect, urban flooding, urban desertification and so on. In this context, green roof systems is considered to be an efficient alternative to deal with these problems. However, it is difficult to apply green roof to new buildings since the majority of the buildings in cities are already constructed and the demand for new building constructions is not high enough. Therefore, it should be considered to apply green roof system to existing buildings for resolving various problems. This study evaluates heating and cooling energy consumption based on the combination of passive design factors such as wall, roof, window insulation in addition to a green roof system applied to an existing house by using an energy simulation program. Total 8 potential improvement cases are developed. Each case is applied to the same house with different insulation standard for simulations. Through the analysis of the simulated cases with the chosen test house, it is confirmed that heating energy consumption decreases as improvement cases are applied, but cooling energy consumption is relatively not much affected by each improvement case. In addition, when each improvement case is applied to already highly insulated house, the effect of thermal energy improvement decreases while the same improvement that is applied to the case with low insulated house tends to yield higher improvement rate.

Analysis of the Energy Saving Effect for the External Insulation Construction by Building Load Calculation Method (건물 부하계산 프로그램을 이용한 외단열 시공의 에너지 절감 효과 분석)

  • Park, Jaejoong;Myeong, Jemin;Song, Doosam
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.29 no.3
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    • pp.97-104
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    • 2017
  • Reinforcement of insulation in apartment buildings reduces the heating and cooling energy consumption by lowering the heat transfer in the building envelope. There are differences between internal and external insulation methods in heat transmission properties. However, some building load calculation programs cannot analysis the differences between the two. This is because these programs do no account for the timelag or thermal storage effect of the wall according to the location of insulation. In this study, the heat transmission characteristics of internal and external insulation were analyzed by EnergyPlus, and heating and cooling energy demand was compared. The results showed that external insulation system had lower heating and cooling loads than internal insulation system. Also the heat transfer rate of external insulation is steadier than internal insulation. About 13.6% of heating and cooling energy demand decreased when the outdoor wall was finished with external insulation compared to the demand with internal insulation.

Study on the Performance of a Cascade Heat Pump with Two-stage Water Heating Process (2단 승온 캐스케이드 히트펌프의 성능 특성에 관한 연구)

  • Jang, Hanbyeoul;Choi, Jong Min
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.12 no.4
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    • pp.27-32
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    • 2016
  • It is estimated that only heating and cooling take about one third of the total energy consumption worldwide. However, the conventional heating and cooling systems have low efficiencies. Also, boilers and electric heaters that are mostly used to generate both domestic and industrial hot water are inefficient and high energy consumers. For this reason, cascade heat pumps which are known to be very energy efficient and have less environmental impact are being promoted to replace conventional heating, cooling and hot water systems. In this study, a newly designed cascade heat pump by two-stage water heating method has been experimentally investigated. By adopting the auxiliary heat exchanger, the performance of the system was increased. The performance enhancement rate of the system could be maximized by adjusting the low stage compressor speed rather than the high stage compressor speed. The performance of the system with the auxiliary heat exchanger was enhanced by 16.5%.

An Internet-based Survey on the Characteristics of Energy Consumption of Apartment (인터넷을 이용한 공동주택의 에너지소비특성 실태조사)

  • 황광일
    • Journal of the Korean housing association
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    • v.13 no.6
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    • pp.41-48
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    • 2002
  • The purpose of this study is, by the method of the internet-based survey, to understand the relations between the residential condition and the characteristics of energy consumption. The followings are the results of this study. $\circled1$ Among 601 responses, evaluable 329s means that the user fully understanding what this survey is for. $\circled2$ Gas-or oil-burners occupy 80% of heater. $\circled3$ Contrary to expectations, we can not find out the relations between the cooling area and the cooling capacity of Air-conditioners. $\circled4$ There is no relation between the direction of apartment and the cooling capacity, neither. $\circled5$ During the summer, average and maximum monthly electric fare for cooling is ₩198/$\textrm{m}^2$ and ₩461/$\textrm{m}^2$, respectively. $\circled6$ And during the winter, average and maximum monthly electric fare for heating is ₩335/$\textrm{m}^2$ and ₩484/$\textrm{m}^2$, respectively.

An Experimental Study on the Applicability of a Multiplex Heat Pump System in the Kindergarten (유치원 건물에서 다중 히트펌프 시스템의 적용에 관한 실험적 연구)

  • Han, Seol-Yee;Kim, Seo-Hoon;Jang, Hyang-In;Lee, Sang-Hyeok;Suh, Seung-Jik
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.25 no.10
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    • pp.540-547
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    • 2013
  • We experimented with the energy saving effect of applying a multiplex heat pump system and suggests a dissemination plan for new and existing educational facilities. The development and dissemination of a new system could reduce energy consumption by up to 57%, and help solve environmental issues. Experimental performance evaluated in the kindergarten to analyze the energy saving effect of the cooling and heating system. The average daily COP of the cooling and heating period in the field test was 3.79. Our results showed that the annual energy consumption was reduced, and proved that the multiplex heat pump system is effective in reducing energy consumption.

Experimental Study on Performance Evaluation of System Air-Conditioner using Compressor of PWM or Inverter Method (Cooling and Heating Characteristics) (PWM 방식과 인버터 방식의 압축기를 사용한 시스템 에어컨의 성능평가에 대한 실험적 연구(냉난방 특성))

  • 전용호;김대훈;허삼행;권영철;문제명;홍주태
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.15 no.9
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    • pp.738-743
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    • 2003
  • In the present study, the heating and cooling characteristics of system air-conditioner using a PWM compressor or a BLDC inverter compressor are investigated by the psychometric calorimeter using air enthalpy method. Cooling and heating capacities, power inputs and COPs are measured at the low, moderate, high loads under the cooling and heating standard conditions. At cooling conditions, the capacity of the PWM system is larger than that of the inverter case. Due to large power input, however, low COPs are measured under total load ranges. At heating conditions, the capacity of the PWM method is a little larger than that of the inverter case, except high load range. Since power input is low, large COPs are measured at moderate and high load ranges, which are different from cooling data. This shows that the PW system compared with the inverter case has good energy consumption efficiency at moderate and high load ranges except low load range. And when the system A/C is operated under the cooling and heating standard conditions, COPs are nearly uniform at total load ranges.

A Case Study for Energy Consumption Characteristics of High School Facilities in Seoul (서울지역 고등학교 건물의 에너지소비특성에 관한 사례분석)

  • Kim, Sung-Bum;Oh, Byung-Chil;Shin, U-Cheul
    • Journal of the Korean Solar Energy Society
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    • v.36 no.6
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    • pp.61-69
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    • 2016
  • In this study, we analyzed five-year(2011~2015) data for D high school in Seoul area to analyze energy consumption characteristics in high school. The results are summarized as follows. (1) In the result of comparison analysis about 2015 energy consumption by usage, based on primary energy, 18% of energy was consumed in cafeteria, and 82% was consumed in main building. In the case of main building, base and constant load excepting hot water supply in restroom took 40%, heating including freeze protection took 20%, hot water supply in restroom took 14%, and cooling took 8% in order. (2) In the 2015 total energy consumption in D high school based on primary energy, heating energy takes 28%. The range and limit of energy savings coming from the reinforcement of insulation and window performance could be estimated. (3) To introduce new & renewable energy system in high school, electricity-based system is suitable than heat-based system because usage of electric energy is larger than that of heat energy in high school. (4) Five-year energy consumption unit according to heating degree-day showed a linearly increasing trend, and the coefficient of determination(R2) was 0.9763, which means high correlation.

Comparative Analysis on the Heating and Cooling Loads Associated with U-value, SHGC and Orientation of the Windows in Different Regions (창호의 열관류율, 일사취득계수와 향의 배치가 건물의 냉난방 부하에 미치는 영향에 관한 지역별 비교연구)

  • Choi, Min-Seo;Chang, Seong-Ju
    • KIEAE Journal
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    • v.13 no.2
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    • pp.123-130
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    • 2013
  • The primary goal of this research is to identify the impacts of window design on the energy use in buildings which takes up about 25% of the total energy consumption. Recently, efficient use of energy is gaining more importance in buildings. Window design, especially being dependent on glazing performance choices, is an important factor for reducing energy consumption in most of the buildings. It also is influenced by the latitude of the site and window orientation. This paper aims at identifying the influence of Window performance indicators(U-value, SHGC), orientation and latitude on the building energy consumption with systematically designed simulations. Comparative study has been performed for five different locations; Greenland, Korea, Singapore, Argentina and Chile along with the different window U-value and SHGC values. The results show that optimum window system with properly coordinated window performance indicators(U-value, SHGC), orientation achieves dramatic reduction of energy consumptions. Windows with low U-value could reduce heating loads and high SHGC could reduce cooling loads. The study also verifies that the windows installed at south facade is more energy efficient in the northern hemisphere while windows facing north is more energy efficient in the southern hemisphere.

A Study on the Planning of Urban Energy Supply Systems Including Co-generation System (도시지역 에너지 공급체계 개선방안 검토 연구)

  • Woo, Nam-Sub;Lee, Tae-Won;Kim, Yong-Ki
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.177-182
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    • 2009
  • The purpose of this study is to investigate planning of urban energy supply systems configuration and operating conditions for the district heating and cooling system using combined heat and power system. Generally the district heating and cooling system has been known to one of the effective way for energy saving, cost reduction and demand side management of energy. Economical analyses were carried out and operating characteristics for some systems were examined in terms of GER factor which represents to the ratio of gas and electricity costs. Rates of the energy consumption and the $CO_2$ emission were compared from the system configuration of the energy supply system with new district cooling system with the conventional one.

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