Paper Conference

Proceedings of ASim Conference 2014: 2nd Asia conference of IBPSA-China, Japan, Korea


Evaluation on the Thermal Performance with Thermally Activated Building System (TABS) Using Phase Change Materials

Hyun-Hwa Lee, Yoon-Ji Kim, Jae-Han Lim, Sumin Kim, Seung-Yeong Song

Abstract: Electrical consumption by heating and cooling systems has been increasing rapidly, as a result of abnormal atmospheric temperature changes, and this increase has caused a national-level blackout in South Korea. By coupling a thermally activated building system (TABS) to the HVAC system of an office building, the peak load can be shifted because of the time-lag caused by the high thermal inertia of a concrete slab; thus, the discrepancies between energy demand and energy supply can be reduced. In addition, TABSs can be integrated with low-temperature heating and high-temperature cooling sources (e.g., renewable energy and unused energy sources) to increase a building’s energy efficiency. Recently, TABSs with phase-change materials (PCMs) were studied to decrease heating and cooling energy consumption in buildings and reduce CO₂ emissions. However, in Asia, TABSs are not as common as in Europe and the USA because of the weather conditions and cultural and technical differences. In particular, because South Korea is hot and humid in the summer, TABSs are necessary to prevent surface condensation problems. The aim of this study is to analyze the thermal performance of TABSs using PCMs. The simulation program BISTRA, a thermal analysis program for transient heat transfer in two-dimensional free-form objects, was used to evaluate thermal output and thermal storage according to various TABS designs with PCMs. Consequently, we have prepared a design guide for TABSs that use PCMs.
Keywords: Thermally activated building system (TABS), Phase-change material (PCM), BISTRA, Thermal performance, Condensation, Design guide
Pages: 411 - 418