| Title |
Analysis of the Energy Performance in Underfloor Air Distribution System Depending on Outdoor Air Intake Rates |
| Authors |
Kim Dong-Hee ; Yu Ki-Hyung ; Cho Dong-Woo ; Yu Ji-Yong ; Huh Jung-Ho |
| Keywords |
Underfloor Air Distribution System(UFAD) ; Outdoor Air Intake Rates ; Energy Performance ; Energy Simulation |
| Abstract |
In this paper, we discussed the energy performance of underfloor air distribution(UFAD) and overhead air distribution system according to outdoor air intake rates in a office building. For this, the H building is selected for measuring the thermal environments of UFAD system and overhead system. Based on the measured data, the TRNSYS simulation is used to evaluate the energy performance of UFAD system and the overhead system according to outdoor air intake rates at virtual space. The zone of the UFAD system was divided into two horizontal nodes to simulate the temperature stratification and the overhead system was consisted of one zone considering full mixing in overhead system zone. Each node of UFAD system was coupled to its upper node. By increasing outdoor air intake rates from required outdoor air intake rates(100CMH) to maximum air intake rates, the energy savings of UFAD system comparing with overhead system are varied 15%～25.6% in summer, 12.8%～19% in fall/spring and not varied in winter(8%). As results of simulations on stratification height, the lower the stratification height, the larger cooling energy savings of UFAD comparing with overhead system according to outdoor air intake rates. |