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SUMMARY:SMART LIVING LUNCH | Thermal performance of air-spaces behind clad
 dings
DTSTART:20210310T110000
DTEND:20210310T120000
DTSTAMP:20260916T010329Z
UID:46b3532088135a6dcf1157cecf8131368eb8ace0ee6e73347aa0f707
CATEGORIES:Conferences - Seminars
DESCRIPTION:Mohammad Rahiminejad\nJoin our next Smart Living Lunch online 
 on March 10th 2021 from 11:00 to 12:00. Mohammad Rahiminejad (TEBEL\, EPFL
 ) will talk about the impact of air-flow on thermal performance of air-spa
 ces behind cladding (Ashrae 1759-RP). Zoom link upon registration. \n\nIt 
 is estimated that nowadays buildings account for approximately 40% of the 
 total energy consumption and they are responsible for approximately 36% of
  CO2 emissions. The introduction of wall designs that incorporate airspace
 s behind claddings for thermal resistance in energy design guides can redu
 ce energy use by buildings and boost the thermal efficiency of dwellings.\
 n\nThe project ASHRAE 1759-RP addresses the impact of the ventilated cavit
 y behind external claddings on the thermal performance of the wall structu
 re by defining “effective thermal resistance” of air gaps based on the
  linearized network of thermal resistances that is the basis for building 
 components energy code compliance applications. The magnitude of the impac
 t significantly depends on conditions such as air flow rate\, air temperat
 ure\, and incident solar flux. Even for steady-state and no solar conditio
 ns\, the air space could be able to resist the heat flow even more than ce
 rtain wall components. For certain air change rate values\, ventilation ai
 r flow in the air cavity effectively off-sets or diminishes the thermal re
 sistance contribution of the cladding to the overall wall assembly\, and t
 he cladding thermal resistance no longer fully contributes to the simple l
 inearized network of thermal resistances.\n\nThe project provides suggesti
 ons to improve thermal design accuracy to support code-compliant use of th
 e ventilated air spaces by accounting for the thermo-hydrodynamic behavior
  of the airflow\, and it provides recommendations to modify the ASTM C1363
 -19 test method to incorporate and study air flow-related effects consider
 ing possible uncertainty of measurement.\n\nwww.smartlivinglab.ch/en/therm
 alperformance/ 
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STATUS:CONFIRMED
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