• Title/Summary/Keyword: heating load

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Heating and Cooling Load Evaluation Study with TAC Based BIN Data (TAC를 반영한 BIN 데이터 기반의 냉난방 부하 변화에 관한 연구)

  • Lee, Kwang Seob;Kim, Yu Jin;Min, Kyung Chon;Lee, Euy Joon;Kang, Eun Chul
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.29 no.9
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    • pp.463-471
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    • 2017
  • According to the Korea industrial standard of air conditioning systems (KS C 9306), cooling and heating loads for buildings can be calculated by using maximum and minimum temperature in BIN data. Cooling and heating loads can be determined by building set temperature and ambient temperature. Cooling and heating system capacity of buildings can be normally designed according to determined heating and cooling loads. Cooling and heating system capacity can be reduced by updated BIN data, applying TAC (Technical Advisory Committee) values. In this study, updated BIN data have been analyzed using ambient temperature of 19 areas in Korea for the last 10 years (2005~2014) provided by KMA (Korea Meteorological Administration). Building cooling and heating loads have been calculated following TAC based BIN data. As a result, designed system capacity decreased depending on applying TAC. Those were reduced as 7.1% ($100m^2$ building), 8.7% ($1,000m^2$ building) in cooling capacity, 11.7% in heating capacity when TAC 2.5% applied. And also, it is expected system initial and operating cost by decreasing system capacity.

Interaction Analysis between Cooling-to-Heating Load Ratio and Primary Energy Consumption of HVAC&R System for Building Energy Conservation (건물의 냉, 난방 부하비율과 HVAC&R 시스템 1차 에너지 소비량의 상관관계분석 및 합리적 설계방안 연구)

  • Cho, Jinkyun;Kim, Jinho;Lee, Suengjae;Kang, Hosuk
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.27 no.3
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    • pp.113-122
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    • 2015
  • HVAC&R systems account for more than 50% of the energy consumption of buildings. The purpose of this study is to propose an optimal design method for the HVAC&R system and to examine the possibility for the energy conservation of a selected system. The energy demand for cooling and heating is determined by using TRNSYS and HEET. By an interaction between total system efficiency and cooling-to-heating load ratio, the optimal HVAC&R systems will be decided. The results showed that this proposed method is significantly capable of determining optimal system and building design for saving energy.

Heating Performance of a Ground Source Multi-Heat Pump for a Greenhouse (지열원 멀티 열펌프 시스템의 시설원예 적용 난방성능 특성 실증 연구)

  • Kang, Shin-Hyung;Choi, Jong-Min;Moon, Je-Myung;Kwon, Hyung-Jin
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.22 no.6
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    • pp.337-344
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    • 2010
  • Good plant-growth conditions can be achieved by means of using greenhouses. One of the main issues in greenhouse cultivation is energy savings through the development of high efficient heating and cooling system. GSHPs are one of the recommended systems to cope with this pending need. The aim of this study is to investigate the heating performance of ground source multi-heat pump system installed in a greenhouse under part load conditions. Daily average heating COP of the heat pump unit was very high by at least 7.4, because of relatively large condenser, evaporator, and mass flow rate through ground loop heat exchanger. However, the system COP, overall heating coefficient of the performance of the system with heat pump unit and GLHX, decreased drastically due to relatively large power consumption of circulating pump under part load condition. It is suggested that the technology to enhance the performance of the ground source multi-heat pump system for a greenhouse under part load conditions should be developed.

TRNSYS Dynamic Simulation for Solar Heating and Cooling Load Estimations (태양열 냉난방 부하산정을 위한 TRNSYS 동적 시뮬레이션)

  • Choi, Chang-Yong;Ko, Sang-Cheol;Kwak, Hee-Youl
    • Journal of the Korean Solar Energy Society
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    • v.26 no.1
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    • pp.1-6
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    • 2006
  • This paper presents the heating and cooling load estimations for the library of a cultural center building located in Gwangju Korea by TRNSYS with Type 56 of multi-zone building components. In this study, energy rate control mode is selected and the design temperatures for heating and cooling are specified respectively as 20oC and 26oC. Reading rooms of the library are located on the third floor of the cultural center building, and this third floor space is modeled as the five thermal zones for the TRNSYS simulation. Among the five zones, attention is given to the two zones which are the reading rooms 1 and 2. Since these two zones are to be heated and cooled by the solar thermal system which is planned to be installed in the building, dynamic thermal behaviors of the two zones are analyzed by the heating and cooling load estimations.

Basic research on the Building Energy Load Depending on The Climate Change in Korea (대한민국 표준기상데이터의 변화추이와 건물부하량에 관한 기초연구)

  • Yoo, Ho-Chun;Lee, Kwan-Ho;Kang, Hyun-Gu
    • Journal of the Korean Solar Energy Society
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    • v.29 no.3
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    • pp.66-72
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    • 2009
  • As 'Low Carbon Green Building' is highly required, programs to evaluate building performance are actively and commonly used. For most of these programs, dynamic responses of buildings against external weather changes are very important. In order to simulate the programs, weather data of each region must be properly entered to estimate accurate amount of building energy consumption. To this end, the existing weather data and weather data of KSES were compared and analyzed to find out how weather changes. Energy load of Korea's standard houses was also analyzed based on this data. As a result, data corresponding to June ${\sim}$ September when cooling is supplied shows 23% of average increase with 30% of peak increase(June). On the other hand, data corresponding to November ${\sim}$ February when heating is supplied shows 29% of average decrease with 34% of peak decrease(November). Increase in cooling load and decrease in heating load in the above data comparison/analysis show that KSES 2009 data reflects increase in average temperature caused by global warming unlike the existing data. Increase in dry-bulb temperature depending on weather change of standard houses increases cooling load by 17% and decreases heating load by 36%

Evaluation of the Heating and Cooling Systems in School Buildings (학교건물 냉난방설비시스템의 실태조사)

  • AHN, Chul-Lin;KIM, Dong-Gyue;KUM, Jong-Soo;PARK, Jong-Un;PARK, Hee-Ouk;CHUNG, Yong-Hyun
    • Journal of Fisheries and Marine Sciences Education
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    • v.17 no.1
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    • pp.18-25
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    • 2005
  • We have researched 10,811 schools to evaluate the characteristics of school buildings and the conditions of heating and cooling systems at the elementary, middle and high school levels. Air conditioning systems in school buildings are related to school scale, and 35% of the researched schools have less than 10 air conditioned classrooms among all of the schools in Korea. The LOADSYS is used to grasp the characteristics of school buildings heating and cooling load. From the results of this work, the heating load differs by nearly 24% between Seoul and Busan, but other than that there are not so many serious regional differences. Almost 85.4% of the classrooms are equipped with heating facilities and 6.9% of them are equipped with heating and cooling facilities. As a result, it is necessary to make improvements in 31.8% of the classrooms using only heaters and 14.6% of the classrooms not equipped with HVAC. The survey shows that there is a wide gap in the heating equipment status of the classrooms according to the region and school district.

A Study on the liquid Type Solar Heating System (액체식 태양열난방계통에 관한 연구)

  • Nam, Pyong-Woo
    • The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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    • v.8 no.4
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    • pp.221-236
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    • 1979
  • The three years Performance of a liquid type solar heating system has been determined for a system which has been determined for a system which has been operating continuously since 1976 in Seoul with no serious maintenance. A flat plate collector is used to transform incident solar radiation into thermal energy. This energy is stored if the form of sensible energy and used as needed to supply the space heating loads. An electric auxiliary heaters are provided to supply energy for space heating load when the energy in the storage tank is depleted. The ratio of useful collected solar heat divided by the total solar radiation on the collector was obtained about 84 per cent. It is also obtained the relation between ratio of solar collector area to the heating area and the ratio of useful collected solar energy to the heating load for the useful design data. A comparison between the measured and simulated results with the solar space heating system is described. Hour by hour simulation is made on unsteady state basis using the system parameters and meteorological data at the experiment site. The result of comparison turned out satisfactory for the solar heating system, though the simulation was formed somewhat higher than by experimental.

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The Estimation of Heating, Cooling Load and Economical Efficiency Analysis of Insulation Paint Coating Windows (단열 도료 코팅 창호의 냉난방부하 특성분석 및 경제성 평가)

  • Jeong, Yeol-Wha;Kim, Byoung-Soo
    • Journal of the Korean Solar Energy Society
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    • v.31 no.6
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    • pp.95-102
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    • 2011
  • The purpose of study is to estimate heating, cooling load performance and economic efficiency in office building with applied the functional paint. this paint can reduced SHGC(Solar Heat Gain Coefficient) on the glazing surface by coating. In this study, estimated to compared with double glazing, low-e glazing, IP(Insulation Paint) and IPu(Insulation UV-Cut Paint) coating glazing. As a result of this study, 1)heating & cooling load Analysis, SHGC value and U-factor of double glazing is about 0.70 and 3.29($W/m^2K$). low-E glazing is about 0.65 and 2.70($W/m^2K$). Two-side it is about 0.27 and 3.25($W/m^2K$). When compared to double glazing, annual heating & cooling load of low-E glazing, Two-side IPu and IP paint coating glazing is 3,012MWh($124kWh/m^2$), 2,910MWh($120kWh/m^2$), 2,867MWh($118.4kWh/m^2$) and 2,867MWh($118.4kWh/m^2$). It i sreduced to 2.0%, 5.2%, 6.7%, and 6.7% respectively. 2)the estimation of economic efficiency, low-e glazing installed in office building can not recover the investment within a lifetime 40years. but IPu and IP paint, two-side coating in glazing, have a payback period of 13 years respectively.

Field Application of a Latent Heat Storage Tank for Load Shaving of Domestic Hot Water Supply in District Heating (지역난방 급탕공급 부하균등화를 위한 잠열축열조의 현장 적용)

  • Park, Sung Yong;Yoo, Hoseon
    • Plant Journal
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    • v.17 no.2
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    • pp.42-47
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    • 2021
  • In terms of district heating operation, efficient production and supply of heat by alleviating the peak load at a specific time require an application technology that can solve the inconvenience of the user and the difficulties of the supplier. In this study, a 78 ℃ class PCM heat storage tank suitable among the technologies that can solve these problems was manufactured and applied to the hot water supply facility for apartments in district heating users. As a result of the application of this system, it was confirmed that the supply temperature was constant to the user compared to the existing supply method. In addition, it was confirmed that the reduction of the peak load due to load equalization reduced the heat supply margin of 10% in the existing heat supply facility. And the construction cost of the new heat supply facility and the construction cost of heat users is decreased by 5% and 10%, respectively.

Analysis of SEPP type Inverter for Induction Heating (유도 가열용 SEPP 인버터의 특성 해석)

  • Moon, Chang-Soo;Baek, Seung-Myun;Sim, Kwang-Yeal
    • Proceedings of the KIEE Conference
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    • 1998.07f
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    • pp.1911-1913
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    • 1998
  • This paper has described about a SEPP Inverter for induction heating load. It is analyzed theoretically about the Inverter operation for induction heating. According to the parameters of induction heating load, it is proposed a method of circuit analysis and operation characteristics of the Inverter. In addition, the soft switching technology known as ZVS(Zero Voltage Switching) is used to reduce turn on and off loss at switching. The Proposed inverter shows it can be practically used as power source system for high frequency induction heating appliancs.

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