• 설비공학논문집
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• 제14권2호
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• pp.127-133
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• 2002

The objectives of this paper are to develop an advanced GAX cycle named HGAX (Hybrid Generator Absorber heat exchanger) cycle, and to study the effect of key parameters on the cycle performance and the hot-water temperature from the condenser. New types of the HGAX cycle are developed by adding a compressor between the generator and the condenser- Type C (performance improvement and reduction of the generator temperature) and Type D (Hot-water temperature application). The solution temperature in the generator outlet is reduced to 168$^{\circ}C$ with the COP improvement of 19% compared to the standard GAX cycle. The hot-water temperature from the condenser is raised to 106$^{\circ}C$ for panel heating (Ondol heating) application.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2006년도 추계 학술논문 발표대회 논문집
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• pp.43-46
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• 2006

The Hwangtoh is one of the traditional construction material used in wall, plastering material, and ondol (Korean underfloor heating system) with stone and wood. It is an important greenness material and it has much advantages such as; high storage of heat, auto-purification, antibiotic ability, and emission of far infrared rays. But, it is not developed and not used in modern construction because of its low strength and properties of dry shrinkage crack. According to the recent researches and studies, it is evaluated for natural pozzolanic material like flyash or pozzolan. It's possibility on construction material is high because it's chemical and mineralogical proportion is like as Metakaolin and Kaolinite. In this point of view, this study aims to analyze the physical properties on Hwangtoh mortar through an experiment with various activation condition of Hwangtoh, which is natural pozzolanic material, for the purpose of increase the using possibility in construction material.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 춘계 학술논문 발표대회
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• pp.89-90
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• 2019

The purpose of this study is to clarify the difference between design and construction conditions based on theory for support (S) and infill (I) distinction and separation in long-life housing, and to search for future direction. To do this, the SI theory is summarized and the construction situation is examined in the demonstration house and the differences and limitations are analyzed. In order to realize SI separation in Korea, it is necessary to set the position of pipe shafts for sewage and drainage, buried in the structure and Ondol layer of the private pipes, buried various wires in the inner wall, and fixing the position of the inner wall.

• 설비공학논문집
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• 제13권11호
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• pp.1165-1173
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• 2001

The objectives of this study are to analyze the application of radiant floor cooling and to evaluate the control methods through experiments when the radiant heating system is used for cooling. Through the experiment analysis the control methods such as on/off control, variable flow control and outdoor reset with indoor temperature feedback control are evaluated and compared. The cooling curve (reset ratio) is found for radiant cooling, which shows tole relation between outside air temperature and supply water temperature. Comparison of cooling methods shows that outdoor reset with indoor temperature feedback control is more appropriate than on/off control and variable flow control with regard to prevention of the condensation and thermal comfort.

• 건축역사연구
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• 제3권1호
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• pp.9-22
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• 1994

In Pyonjon, Kings received high-ranked officials, heard preachings of classical literatures. State affairs were also discussed here. In palaces of the Chosun Dynasty, Pyonjon used to be regarded as the most important building second to the main hall. In Changduk palace, Sonjongjon was the original Pyonjon. But, before the end of the 17th century, Huijongdang began to be called Pyonjon, and after the 19th century, Huijongdang became Pyonjon officially. Sonjongjon was located beside the main hall, while Huijongdang before the King's bedroom. The floor of the former building was covered with brick but Huijongdang covered with ondol and wooden floorings. In Sonjongjon, every man sit on the chair, but in Huijongdang King and officials used to sit down on the floor. The fact that Huijongdang became Pyonjon replacing to Sonjongjon meant change of building arrangement in the palace and usage of inner space.

• International Journal of Air-Conditioning and Refrigeration
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• 제12권2호
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• pp.108-112
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• 2004

The purpose of this study is to investigate the characteristics of thermal comfort index and to present the thermal comfort range through regression analyses and experiment in a radiant floor heating system laboratory. The results were compared to the comfort zone of ISO-7730, and the applicability of the thermal comfort index to a radiant floor heating system was studied. On comparing the sedentary posture on the floor to sitting on the chair, the comfort zone and the neutral point of comfort index showed different values. It is considered that the influence of conduction from floor to the human is sufficient. Moreover, we could find a correlation between the thermal sensation votes of subjects, and the comfort indexes were lower than those by calculation.

• 대한설비공학회지:설비저널
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• 제16권2호
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• pp.140-153
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• 1987

Main objective of this study is to provide heating cost allocation method according to the amount of heating energy consumption in apartments. Heating energy consumptions are calculated by DOE-2.1A program. As a result, heat loss ratio in Ondol heating system, heating cost coefficients of apartments and its using method is presented. Maximum heating cost coefficient rate is 2.63.

• 대한설비공학회지:설비저널
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• 제7권4호
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• pp.227-238
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• 1978

Draft of the conbustion gab burning in a briquette gives a great part of driving force to the flue gas in an Korean conventional ondol heating system. The Paper present s how the draft intensity varies for each whole Combustion duration. In this experiment the temperatures of thirty spots In three gas courses of a briquette were measured and the drafts were calculated form those experimental data. The result is that the shorter the combustion duration of a briquette is, the stronger the draft becomes, the intensity of drafts ranging between 0.15mm Aq to 0.26mm Aq.

• 대한설비공학회지:설비저널
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• 제3권3호
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• pp.180-184
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• 1974

From the point of view of the second law of thermodynamics, house heating and cooling systems were analysed for saving energy. The analysis provides a theoretical basis for the heat-pump application. Also the efficiency of energy use is defined more rigorously by comparing the thermodynamic availability actually consumed in heating and cooling with the minimum thermodynamic availability required to do the same heating and cooling. It was found that the present 'Ondol' heating system has a heating efficiency of around $8\%$ according to the definition described here. Several schemes to inprove the efficiency are presented.

• 대한설비공학회지:설비저널
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• 제3권3호
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• pp.185-190
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• 1974

Floor panel heating system is popular in Korea as dwelling house heating system. There are two methods for keeping floor surface warm. One method is delivering warm air under the floor such as Roman Hypocaust and Korean traditional Ondol. The other method is imbedding hot water pipes into the concrete floor slab. This paper gives basic equations for steady and transient solutions of heat conduction from hurried pipes. For steady-state solution, fin Efficiency Method and Sink and Source Method were introduced. Sink and Source Method is applied to transient state and basic solution is given in the form of Exponential Integral Function. Numerical solutions can be solved easily by digital computer from these equations.