|
Titel:
|
|
Determination of structural, thermodynamic and phase properties in the NA2S-H2O system for application in a chemical heat pump
|
|
|
|
Auteur(s):
|
|
|
|
|
|
Gepubliceerd door:
|
Publicatie datum:
|
|
ECN
Energie Efficiency in de Industrie
|
1-3-2002
|
|
|
|
ECN publicatienummer:
|
Publicatie type:
|
|
ECN-RX--02-009
|
Artikel wetenschap tijdschrift
|
|
|
|
Aantal pagina's:
|
|
|
32
|
|
Gepubliceerd in: The paper is to be published in: Thermochimica Acta (Jan. 3003) (), , , Vol., p.-.
Samenvatting:
Structural, thermodynamic and phase properties in the Na2S-H2O systemfor application in a chemical heat pump have been investigated using
XRD, TG/DTA and melting point and vapour pressure determinations. Apart
from the known crystalline phases Na2S-9H2O, Na2S-5H2O and Na2S a new
phase Na2S-2H2O has been proven to exist. Na2S-½H2O is not a phase but
a 3:1 mixture of Na2S and Na2S-2H2O, presumably stabilised by very slow
dehydration kinetics. The vapour pressure-temperature equilibria of
the sodium sulphide hydrates have been determined and a consistent set
of thermodynamic functions for these compounds has been derived. XRD
measurements indicate the topotactic character of the transitions between
the hydration states.
Terug naar overzicht.