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Ko H.-I.,Korea District Heating Corporation KDHC | Kim Y.S.,A+ Network | Kim J.M.,Korea Institute of Construction Technology
Euroheat and Power (English Edition) | Year: 2010

The Korea District Heating Corporation (KDHC) conducted a study on vibrations from various sources such as blasting and vehicular loads to establish a reasonable vibration control standard for pre-insulated heating pipes. The field tests were conducted to study vibration impact and blasting results on a pre-insulated heating pipe. The vibration speed due to the motion of the compaction roller and truck was less than 0.328 cm/s under various motion and loading conditions. From the static analysis, the maximum effective stress under static loading conditions was approximately 159.70 N/mm2 at a depth of 3.8m. The effective stress in the inner pipe exceeded the permissible stress level when the vibration speed due to blasting was more than 2.0 cm/s. For the field management of construction equipment, the stability of underground pipes has to be reviewed in terms of equipment weight, vibration magnitude, and motion duration affecting the soil pressure and displacement. Source

Ko H.-I.,A+ Network | Ji J.,A+ Network | Kim J.,Korea District Heating Corporation KDHC | Cho C.,Inha University
Euroheat and Power (English Edition) | Year: 2012

As a part of a structural mechanics study of pre-insulated bonded pipe for district heating, the Korea District Heating Corporation has been performing the research for the reinforced fitting with load resistant property for thermal stress, especially focusing on the structural stability of the bend among reinforced fittings. The end displacement and the stress of bends can be absorbed and dissipated by improving the structural stability of the reinforced bend itself. It is not necessary to install a foam pad which is likely to be deteriorated in its performance due to long-term compression. Source

Lee K.-H.,Korea Institute of Energy Research | Lee D.-W.,Korea Institute of Energy Research | Baek N.-C.,Korea Institute of Energy Research | Kwon H.-M.,Korea District Heating Corporation KDHC | Lee C.-J.,Korea District Heating Corporation KDHC
Energy | Year: 2012

This paper describes a practical and simple method for determining the optimal size of renewable energy systems for building applications at the conceptual design stage. The method suggested in the paper is based on the use of the software tool RETScreen widely used for pre-feasibility or feasibility studies. The software is a convenient and relatively accurate tool for evaluating the feasibility of renewable systems. However, the tool does not provide with a method or function for optimal design. It seems there has been no publication or study to find optimal design parameters for renewable energy systems using the software. By using the features of this software, which can evaluate renewable technologies, this study provides a methodology to find the optimal design parameters for a renewable energy technology in the conceptual design of building energy systems. The paper describes a further development of the method for applications to integrated hybrid renewable energy resources in buildings. The paper also describes how to combine hybrid renewable heating systems, such as hybrid solar thermal and ground-source heat pump systems. Finally, this paper presents case studies on the optimal sizing of a single renewable system and an integrated renewable energy system for building applications. © 2012 Elsevier Ltd. Source

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