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홍희기(Hiki Hong),김시환(Sihwan Kim) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
Ondol heating, a kind of radiant floor heating, is a main method used in housing units in Korea. Building energy simulation including ondol and relevant facilities has not been performed due to its complexity. For evaluating energy consumption and indoor temperature variation, a new method should be proposed. At the present work, a dynamic simulation on ondol heating was tried by combining TRNSYS and EES. Characteristic functions for a pump, hot water coils and a gas boiler were simutaneouly solved by EES, and calculated flow rates and supply temperature of hot water were provided as inputs of the active layer of TYPE 56 in TRNSYS. The results by the simulation on a typical housing unit in Korea shows a good trend in a viewpoint of actual behavior of ondol heating.
홍희기(Hiki Hong),김선국(Sunkuk Kim),유호선(Hoseon Yoo) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
This study was performed to determine the heating energy savings and CO₂ reduction resulting from turning off ondol heating in housing units in Korea. Lowering the room temperature and intermittent heating of a room are effective methods for reducing heating energy consumption. These techniques were proven by modeling simulations in our previous studies. To confirm the simulations, schedule controllers which automatically turned off the ondol heating in the living room and kitchen from 10 pm to 6 am were in stalled at the hot water distributor in five households. The heating gas used in each of the housing units was measured over a period of five years, with and without the schedule controllers. We found that approximately 30% of gas consumption, mainly used for heating, can be saved compared to turning on the appliance during the night.
홍희기(Hiki Hong),김시환(Sihwan Kim) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.7
In housing units constructed recently in Korea, the length of ondol coil is different in each room, so the flow rate of hot water is adjusted by setting valve opening. If the flow rate is not appropriate for heating load, the room temperature seriously deviates from the set temperature range for comfort. In particular, too small valve opening can induce a noise by cavitation. In order to adjust the valve opening, two methods by zone area and a new method by return temperature rise were modelled and simulated using TRNSYS and EES. As a result, heating energy consumption during one week was the same on three methods, but the room temperature of the new method minimally deviated from the range of set temperature with a low possibility of noise.
홍희기(Hiki Hong),최준영(Junyoung Choi),임신영(Shin Young Im) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.10
Most European economies, Japan, and many governments have made it a major policy to expand the green business by disseminating heat pump technology, which has a large CO2 reduction effect. The heat pump of all heat sources has been recognized as renewable energy and the policy to encourage has been implemented. In the recently revised Renewable Energy Law, the hydrothermal source (surface sea water) heat pump was newly included in renewable energy. In addition, the scope of application of heat pumps has expanded in the mandatory installation of renewable energy for new buildings, remodeling buildings, and reconstructed buildings based on this law. However application to heat pumps using all natural energy as heat source has been put off. In this revision, the ratio of renewable energy to the total energy produced by the heat pump was fixed at 73%, which depends on coefficient of performance of heat pump. The ratio of renewable energy is 1-1.8/COPH, and should be calculated including the coefficient of performance of the heat pump. Using a high efficiency heat pump or a high-temperature heat source increases the coefficient of performance and also reduces CO₂ emissions. It is necessary to expand the application of heat pumps as renewable energy equipment and to improve the correct calculation of renewable energy production.
홍희기(Hiki Hong),김영균(Young Kyun Kim) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
Low temperature ondol heating has a lot of advantages; efficiency increase of condensing boiler, COP increase of heat pump and collection efficiency in solar thermal heating. We showed the possibility to apply a real situation of an apartment housing by simulation. As a result, heating energy consumption during one week was the same though the supply hot water temperatures are changed, but the elaped time to a set room temperature becomes longer.
홍희기(Hiki Hong),김시환(Sihwan Kim) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.6
Ondol heating, a kind of radiant floor heating, is a main method used in housing units in Korea. Building energy simulation including ondol and relevant facilities has not been performed due to its complexity. For evaluating energy consumption and indoor temperature variation, a new method should be proposed. At the present work, a dynamic simulation on ondol heating was tried by combining TRNSYS and EES. Characteristic functions for a pump, hot water coils and a gas boiler were simutaneouly solved by EES, and calculated flow rates and supply temperature of hot water were provided as inputs of the active layer of TYPE 56 in TRNSYS. The results by the simulation on a typical housing unit in Korea shows a good trend in a viewpoint of actual behavior of ondol heating.