| Title |
A Study of Overall Heat Transfer Coefficient and HVAC Load according to Installation and Thermal Insulation Methods of Curtain Walls |
| Authors |
Jong Jun Park ; Eu Won Kim ; Young Il Kim |
| DOI |
https://doi.org/10.6110/KJACR.2020.32.10.465 |
| Keywords |
냉난방부하; 커튼월; 프레임; 열관류율; 전열해석; 트렌시스 Cooling and heating load; Curtain wall; Frame; Heat transfer coefficient; Thermal analysis; TRNSYS |
| Abstract |
The curtain wall system has become a popular trend for modern building envelopes mainly because of its aesthetic feature. However, low thermal performance and difficulty in exchanging indoor and outdoor air for ventilation are two major factors that need improvement. Generally, influence of a curtain wall frame is not considered when calculating the cooling and heating loads of buildings, which results in inaccurate HVAC load calculations. In this study, the effect of the shape and installation methods of a curtain wall system on cooling and heating loads was analyzed for four types of widely used curtain wall system, which are Capture unitized, 4-side unitized, Capture stick, and 4-side stick curtain wall systems. Heat transfer analysis with THERM and WINDOW showed that the Stick curtain system has better thermal performance than the Unitized curtain system. Performing dynamic simulation with TRNSYS program, averages of the cooling and heating loads were calculated for four curtain wall types. The average cooling load per unit area was lowest at 44.72 W/㎡ with the Capture unitized system in August and the average heating load per unit area was lowest at 21.03 W/㎡ with the Capture stick system in January. |