Browse > Article
http://dx.doi.org/10.6110/KJACR.2013.25.1.014

An Energy Performance Evaluation of UFAD System under the Various Conditions of Thermal Load  

Yoon, Seong-Hoon (Green Building Research Division, KICT)
Jang, Hyang-In (Dep. of Architectural Eng., Inha University)
Kim, Kyung-Ah (Green Building Research Division, KICT)
Yu, Ki-Hyung (Green Building Research Division, KICT)
Suh, Seung-Jik (Dep. of Architectural Eng., Inha University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.25, no.1, 2013 , pp. 14-19 More about this Journal
Abstract
The present study has been conducted for evaluating and comparing the performance of the underfloor air distribution system(UFAD) and the ceiling based air distribution system(CBAD) under cooling condition. Simulations and experiments were carried out for verifying the model by TRNSYS program about UFAD and CBAD. The results of simulation for various conditions of thermal load are summarized as followings. UFAD had an advantage for making thermal comfort because of lower temperature of the floor surface. Moreover, UFAD showed lower fan power about 30~50% than CBAD under the same conditions of thermal load. The energy saving rates of UFAD were increased to 17.7% in proportion to the thermal load on unoccupied zone(lighting). Ultimately, additional investigations should be done for analyzing optimized operating conditions of UFAD with considering the thermal performance of building envelop and the thermal load.
Keywords
UFAD; CBAD; Energy performance evaluation;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Bauman, F. and Webster, T., 2001, Outlook for underfloor air distribution, ASHRAE Journal, Vol. 43, pp. 18-25.
2 Webster, T., Bauman, F., and Reese, J., 2002, Underfloor air distribution : Thermal stratification, ASHRAE Journal, Vol. 44, pp. 28-36.
3 Research group of underfloor HVAC system, 1993, Design and practice of underfloor HVAC system, Gizutsushoin Inc., Tokyo.
4 Bauman, F., 2003, Underfloor Air Distribution (UFAD) Desing Guide, ASHRAE Inc.
5 Ali Alajmi and Wid El-Amer, 2010, Saving energy by using underfloor-air-distribution (UFAD) system in commercial buildings, Energy conversion and management, pp. 1637-1642.
6 Yu, K. H., Cho, D. W., Yu, J. Y., Lee, J. Y., and Lee, S. Y., 2004, Comparative evaluation of indoor environment of office buildings with an underfloor air distribution system and a ceiling based air conditioning system, Journal of AIK, pp. 185-192.   과학기술학회마을
7 Cho, Y., Kwon, H. S., Kim, S. H., and Kim, Y. I., 2000, Experimental analysis of thermal comfort of an office space for ceiling and floor supply air conditioning systems, Journal of SAREK, pp. 810-816.   과학기술학회마을
8 Chung, J. D., Hong, H. K., and Yoo, H. S., 2010, Analysis on the impact of MRT for the thermal comfort of UFAD, Energy and Buildings, pp. 2353-2359.
9 Chae, Y. T., Moon, H. J., Sohn, J. Y., Ahn, B. W., and Park, B. Y., 2000, Comparative Evaluation of Indoor Thermal Environment and Energy Consumption between Ceiling-Based System and Floor-Based System in Cooling Period, Journal of AIK, pp. 101-108.   과학기술학회마을
10 Yu, K. H. and Song, K. D., 2007, A Study on Design Techniques and Effectiveness in Energy Saving of Occupied Zone in UFAD System, Journal of the Korean Solar Energy Society, pp. 127-133.   과학기술학회마을
11 Kim, J. H., Kim, D. E., Aum, T. Y., and Hong, M. H., 2011, Load Estimation and Energy Saving Potential in Underfloor Air Distribution( UFAD), Proceeding of SAREK Summer Annual Conference, pp. 198-201.
12 ISO 7730-2005, Ergonomics of the thermal environment-Analytical determination and interpretation of thermal comfort using calculation of the PMV and PPD indices and local thermal comfort criteria.