As the Inter-floor Thermal Insulation Regulation of apartment house applies, in this study, indoor thermal performance and downward heat loss between the cases when insulation exists and doesn t exist change in the thickness of the structure slab under the inter-floor noise isolation standard, and thermal characteristic of typical floor structure will be compared and analyzed through simulation. And the resultant information will be provided as the basic data for designing Ondol heating design suitable for the property of apartment houses in Korea.
As the Inter-floor Thermal Insulation Regulation applies since 2001, upward thermal performance was found to increase by 2~3% but downward heat loss decrease by approx. 30% or more representing that remarkable portion of downward heat loss is reduced. As result of comparing five prototype floor structures, upward thermal performance of the standard floor structure was found to be 70~71 W/㎡ while downward heat loss was, in the case of prototype floor structure, 10~11 W/㎡.
As result of simulating the change in thermal performance as per the height of hot water supply pipes, it was found that upward thermal performance increases as the height of pipe gets higher. On the other hand, the difference of temperature between the place right above the pipe and the in-between place gets larger, which implies that thermal performance and difference of hot water temperature should be taken into account in the design of Ondol structure. The difference of upward thermal performances according to the height of pipe and downward heat losses were found to be approx. 10.8% and 5.81% respectively. The thermal performance information in prototype floor structure suggested in this study will be used for the basic data for the design of Ondol heating design.

Abstract
 1. Introduction
 2. Subject Model Settings
  2.1 Model for Analysis
  2.2 Simulation Condition Settings
 3. Thermal performance characteristic of the Ondol by the Inter-floor Thermal Insulation Regulation
 4. Analysis of thermal performance characteristic of apartment house's typical floor structures
  4.1 Thermal characteristic owing to the change in slab thickness
  4.2 Thermal performance of Prototype floor structure
 5. Analysis of thermal characteristic through the change of hot water
 6. Conclusion
 Reference

• Kihyung Yu(Building & Urban Research Division, Korea Institute of Construction Technology)
• Dongwoo Cho(Ph.D, Building & Urban Research Division, Korea Institute of Construction Technology)