Buildings XI Conference Workshop 2: Thermal Mass IV Assessing Thermal and Moisture Control Benefits of PCM Components by Hygrothermal Simulation
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1 Buildings XI Conference Workshop 2: Thermal Mass IV Assessing Thermal and Moisture Control Benefits of PCM Components by Hygrothermal Simulation Hartwig M. Künzel, Fraunhofer Institute for Building Physics
2 Assessing Thermal and Moisture Control Benefits of PCM Contents: Introduction Façade Moisture Control Energy Efficiency Benefits in Winter Conclusions and Outlook
3 Introduction Field Testing 1950s Measuring interior surface temperature to determine risk of condensation (mold) 1951: Foundation of IBP field test site at Holzkirchen
4 Introduction Field Testing Recording exterior surface temperature to determine risk of condensation (algae) 2007
5 Introduction Hygrothermal Simulation Hygrothermal building envelope simulation with detailed radiation balance
6 Façade Moisture Control Tiger pattern caused by wind driven rain
7 Façade Moisture Control Leopard pattern caused by exterior condensation
8 Façade Moisture Control Microbial growth on EIFS façades Hot box / cold box at ORNL Fasteners act as thermal bridges and raise surface temp. above dewpoint
9 Façade Moisture Control Day Night Hygrothermal transfer processes at the surface of an EIFS
10 Façade Moisture Control Field tests comparing façade sections Adhesive EPS Insulation Base coat Finish coat Plaster AAC wall Test wall sections facing west U = 0.3 W/m²K
11 Temperature [ C] Façade Moisture Control Temperature recordings at field test site Dew point temperature of ambient air Wall without insulation U = 1.1 W/m²K Wall with EIFS U = 0.35 W/m²K Time
12 Façade Moisture Control Frequency of load occurrence Exterior condensation occurs more often than driving rain But Amount of water from driving rain is approx. 10 times higher
13 Exterior condensation hours Façade Moisture Control Hygrothermal simulation results for masonry with 10 cm (4 ) EIFS normal dark thick with IR coat with PCM optim. PCM + IR optim. Exterior coat of EIFS
14 Façade Moisture Control Field test Solarimeter (short wave µm) Pyrgeometer (long wave 5 25 µm) Continuous recording of short and long wave incident radiation as well as stucco surface temperature Brick wall with EIFS (10 cm EPS; 5 mm stucco) Location: Holzkirchen Orientation: North
15 Façade Moisture Control Effect of low-e paint
16 Condensation frequency [h] Façade Moisture Control Field test results EIFS surface conditions white grey Low-E grey Long wave emissivity white: 0.95 grey: 0.96 Low-E grey: 0.74 Short wave absorptivity white: 0.23 grey: 0.39 Low-E grey: 0.39
17 Façade Moisture Control Durability of Low-E Paint after application after 12 month exposure
18 Façade Moisture Control Stucco with phase change materials (PCM)
19 Condensation frequency [h] Façade Moisture Control Field test results EIFS surface conditions Standard white PCM grey PCM Low-E grey Monthly mean outdoor temperature October 2003: 5 C October 2004: 10 C
20 Energy Efficiency Benefits in Winter Example case: Office with large window facing south Hygrothermal building simulation
21 Energy Efficiency Benefits in Winter Window Parameters
22 Energy Efficiency Benefits in Winter PCM characteristics
23 Energy Efficiency Benefits in Winter Light-weight external walls (without PCM)
24 Energy Efficiency Benefits in Winter Floor assembly with PCM
25 Energy Efficiency Benefits in Winter Location and climate
26 Energy Efficiency Benefits in Winter Temperature set-points with night-time and weekend set-backs 21 C / 16 C
27 Energy Efficiency Benefits in Winter Internal heat and moisture sources 21 C / 16 C
28 Energy Efficiency Benefits in Winter Calculation results
29 Heat energy demand [kwh] Energy Efficiency Benefits in Winter Calculation results
30 Energy Efficiency Benefits in Winter Heavy-weight external walls
31 Energy Efficiency Benefits in Winter Heavy-weight floor
32 Energy Efficiency Benefits in Winter Calculation results
33 Heat energy demand [kwh] Energy Efficiency Benefits in Winter Calculation results
34 Conclusions and Outlook PCM in stucco of EIFS may help to reduce night-time surface condensation if phase-change temperature range is adapted to local climate conditions PCM may reduce the heating energy demand of light-weight buildings in winter by making better use of solar heat gains For both applications a small hysteresis is not a problem. It could be even beneficial
35 Conclusions and Outlook Introducing PCM hysteresis into hygrothermal simulation models
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