Heat storage number

The heat storage number with the physical unit J / (m³ · K) is the volume -related heat capacity of a solid : ${\displaystyle s}$ ${\displaystyle V}$ ${\displaystyle C}$

${\displaystyle s={\frac {C}{V}}}$

It is calculated from the specific heat capacity by multiplying it by the density : ${\displaystyle c}$ ${\displaystyle \rho }$

${\displaystyle \Leftrightarrow s=c\cdot \rho }$

Example for structural steel :

${\displaystyle s=0{,}46\,{\frac {\mathrm {kJ} }{\mathrm {kg} \cdot \mathrm {K} }}\cdot 7850\,{\frac {\mathrm {kg} }{\mathrm {m} ^{3}}}=3611\,{\frac {\mathrm {kJ} }{\mathrm {m} ^{3}\cdot \mathrm {K} }}}$

The heat storage number is an important property of insulation materials and a decisive factor when designing heat sinks of constant construction volume.

Examples of heat storage numbers

material	s in kJ m −3 K −1
firmly
nickel	3955
iron	3559
copper	3407
zinc	2770
gold	2470
silver	2465
aluminum	2419
titanium	2354
Ice (0 ° C)	1891
magnesium	1818
tin	1655
lead	1463
sodium	1195
Mixture of substances
Concrete , plaster , fireclay	~ 2000
liquid
Water (20 ° C)	4174
Ethanol	1920
mercury	1883
petroleum	1712
gaseous	(c p )
Butane (0 ° C)	4,477
Methane (0 ° C)	1.554
Air (0 ° C)	1,299
Hydrogen (0 ° C)	1.287
Water vapor (100 ° C)	1.244
Argon (0 ° C)	0.933
helium	0.927
Neon (0 ° C)	0.927

swell

1. ↑ Ruhr University Bochum: Nickel, Properties ( Memento from September 24, 2015 in the Internet Archive )

Web links

• Heat storage number. In: Building glossary. oekoplus.de, archived from the original on February 11, 2013 .