Measurement and simulation of summer thermal environment of an atrium enclosed with EFTE foil cushion roof
Document typeConference lecture
Rights accessOpen Access
This paper presents a study to investigate the summer thermal environment of an atrium enclosed with an ETFE cushion envelope using field measurement and simulation. Continuous monitoring was conducted from May 2014 to July 2014 covering sunny and overcast days and nights. Results of the study also examine general thermal performance of ETFE foil cushion envelopes. Measurements of the indoor thermal environmental parameters were conducted at different vertical levels and horizontal positions in the atrium and the recorded data represent the internal conditions with and without operation of the HVAC system, with variable occupancy. The effects of solar transmission, external ambient air temperatures, humidity and surface temperatures of the ETFE cushion on internal air temperatures, mean radiant temperatures and humidity at different levels of the atria are discussed. Impact of solar transmission, air temperature and humidity on user thermal comfort is also assessed. Results obtained from on-site monitoring are compared with those from a predictive model using the dynamic environmental simulation tool TAS. Result of the monitoring showed the following: • Relatively stable thermal conditions at ground floor level • Daytime accumulation of a reservoir of warm air immediately below the ETFE cushion with pronounced thermal stratification. • Negative stratification at upper levels of the atrium at night • Rapid change of external and internal ETFE-foil surface temperature according to solar insolation levels • High insolation and high ETFE surface temperature may adversely affect user thermal comfort in particular at higher levels of the atrium.