| Standardization field | Construction
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| Technical committee | BAS/TC 37- Fire safety in buildings |
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| Term (EN) | thermal inertia |
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| Definition (EN) | product of thermal conductivity (4.322), density and specific heat capacity (4.302)
EXAMPLES The thermal inertia of steel is 2,3 × 108 J2⋅s−1⋅m−4⋅K−2. The thermal inertia of polystyrene foam is 1,4 × 103 J2⋅s−1⋅m−4⋅K−2.
NOTE 1 When a material is exposed to a heat flux (4.173), the rate of increase of surface temperature depends strongly on the value of the thermal inertia of the material. The surface temperature of a material with a low thermal inertia rises relatively quickly when it is heated, and vice versa.
NOTE 2 The typical units are joules squared per second per metre to the fourth power per kelvin squared (J2⋅s−1⋅m−4⋅K−2). |
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| Term (FR) | |
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| Definition (FR) | |
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| Term (DE) | |
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| Definition (DE) | |
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| Term (BS) | toplotna inercija |
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| Definition (BS) | proizvod toplotne provodljivosti (4.322), gustine i specifičnog toplotnog kapaciteta (4.302)
PRIMJERI Toplotna inercija čelika je 2,3 × 108 J2⋅s−1⋅m−4⋅K−2. Toplotna inercija stiropora je 1,4 × 103 J2⋅s−1⋅m−4⋅K−2.
NAPOMENA 1 Kada je materijal izložen toplotnom fluksu (4.173), brzina povećanja temperature površine snažno zavisi od vrijednosti toplotne inercije materijala. Temperatura površine materijala s niskom toplotnom inercijom raste relativno brzo kad se grije, i obrnuto.
NAPOMENA 2 Tipične jedinice su džuli na kvadrat po sekundi po metru na četvrtu po kelvinu na kvadrat (J2⋅s−1⋅m−4⋅K−2). |
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| Term (HR) | |
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| Definition (HR) | |
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| Term (SR) | |
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| Definition (SR) | |
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| Date | 2016-05-17 |
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| Standards | BAS EN ISO 13943:2015 |
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