An integrated solution for school renovation: Double-skin facade with diffuse ceiling ventilation
Authors
Keresztúri, Sarolta ; Kazukalovaite, Eimante
Term
4. Term
Education
Publication year
2024
Submitted on
2024-01-11
Pages
124
Abstract
This study tests the I-DIFFER renovation solution, which combines a double-skin facade and diffuse ceiling ventilation, using experiments. A double-skin facade is a two-layer exterior wall with a ventilated air cavity, and diffuse ceiling ventilation supplies fresh air gently through the ceiling to create low-velocity, even airflow. Experiments were conducted in AAU’s FACADE laboratory in a scaled-down classroom (Test room). The goal is to assess the current control strategy for cooling and heating modes and its effects on temperature distribution in the facade and ceiling cavities, as well as on overall (global) and local thermal comfort in the room. Measurements were carried out during three one-week periods: summer, mid-season, and winter. The results show that the control strategy can achieve its purpose under favorable conditions but needs further optimization. The global comfort analysis found overheating during summer and winter, while the mid-season was dominated by low operative temperatures (the combined perceived temperature). The local comfort analysis indicated a risk of discomfort only due to radiant temperature asymmetry (uneven surface temperatures causing uneven radiant heat), particularly for a seated person in the middle of the room during the mid-season and winter periods.
Dette studie afprøver I-DIFFER-renoveringsløsningen, som kombinerer en dobbeltfacade og diffus loftsventilation, ved hjælp af forsøg. En dobbeltfacade er en to-lags ydervæg med en ventileret luftspalte, mens diffus loftsventilation tilfører frisk luft jævnt gennem loftet med lav lufthastighed for at skabe rolig, ensartet luftbevægelse. Forsøgene blev udført i AAU’s FACADE-laboratorium i et nedskaleret klasselokale (testrum). Formålet er at vurdere den nuværende styringsstrategi for kølings- og varmedrift og dens betydning for temperaturfordelingen i hulrummene i både facade og loft samt for den overordnede (globale) og lokale termiske komfort i rummet. Målingerne fandt sted i tre perioder: en sommeruge, en mellemsæsonuge og en vinteruge. Resultaterne viser, at styringsstrategien kan fungere efter hensigten under gunstige forhold, men at den kræver yderligere optimering. Den globale komfortanalyse viste overophedning i sommer- og vinterperioderne, mens mellemsæsonen var præget af overvejende lav operativ temperatur (den samlede oplevede temperatur). Den lokale komfortanalyse påviste kun en risiko for ubehag på grund af strålingsasymmetri (ujevne overfladetemperaturer, der giver skæv varmestråling), særligt for en siddende person midt i rummet i mellemsæsonen og om vinteren.
[This apstract has been rewritten with the help of AI based on the project's original abstract]