DD226167A3 - METHOD FOR MEASURING THE SORPTION THALPY OF HYGROSCOPIC MATERIALS - Google Patents
METHOD FOR MEASURING THE SORPTION THALPY OF HYGROSCOPIC MATERIALS Download PDFInfo
- Publication number
- DD226167A3 DD226167A3 DD24423882A DD24423882A DD226167A3 DD 226167 A3 DD226167 A3 DD 226167A3 DD 24423882 A DD24423882 A DD 24423882A DD 24423882 A DD24423882 A DD 24423882A DD 226167 A3 DD226167 A3 DD 226167A3
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- DD
- German Democratic Republic
- Prior art keywords
- sorption
- hygroscopic materials
- measuring
- sorptionsenthaipie
- enthalpy
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
Die Erfindung eignet sich zur Messung der Sorptionsenthalpie des Adsorbats Wasser an plattenfoermigen Proben hygroskopischer Materialien. Ziel und Aufgabe der Erfindung sind eine schnelle, einfache und direkte Messung der Sorptionsenthalpie. Erfindungsgemaess wird einer horizontal liegenden diffusionsdicht abgeschlossenen Probe ein Temperaturgefaelle so aufgepraegt, dass eine Feuchtigkeitsverlagerung infolge der Einwirkung der Schwerkraft durch die Wirkung der Sorption ausgeglichen wird, bis ihr Daemmwert ein Minimum annimmt und die Groesse des Temperaturgefaelles gemessen und die Sorptionsenthalpie nach Gleichung (5) berechnet.The invention is suitable for measuring the sorption enthalpy of the adsorbate water on slab-shaped samples of hygroscopic materials. The object and the object of the invention are a fast, simple and direct measurement of the sorption enthalpy. According to the invention, a temperature gradient is superimposed on a sample lying horizontally in a diffusion-tight manner so that a moisture displacement due to the effect of gravity is compensated by the effect of sorption until its da mining value is at a minimum and the size of the temperature vessel is measured and the sorption enthalpy calculated according to equation (5) ,
Description
__ H__ H
"~Rd"~ Rd
P0 = DampfdruckP 0 = vapor pressure
ΡΌ = SattdampfdruckΡ Ό = saturated steam pressure
T = TemperaturT = temperature
H = SorptionsenthaipieH = sorption enthalpy
R0 = GaskonstanteR 0 = gas constant
(Krischer, 0.)(Krischer, 0.)
Wird die Sorptionsenthaipie auf Wasserdampf bezogen, so ist zu H die Verdampfungsenthalpie des Wassers zu addieren.If the sorption enthalpy is related to water vapor, the evaporation enthalpy of the water must be added to H.
Messungen der Sorptionsenthaipie nach diesem Verfahren weisen hohe Fehler auf und führen bei Materialien, wie Gasbeton und Ziege), zu keinem Ergebnis. (Gertis, K.)Measurements of the Sorptionsenthaipie according to this method have high errors and lead in materials such as aerated concrete and goat), to no result. (Gertis, K.)
Ziel der Erfindung ist eine schnelle und direkte Messung der Sorptionsenthaipie des Adsorbats Wasser an plattenförmigen Proben hygroskopischer Materialien.The aim of the invention is a rapid and direct measurement of the Sorptionsenthaipie the adsorbate water to plate-shaped samples of hygroscopic materials.
Die technische Aufgabe, die durch die Erfindung gelöst werden soll, besteht in der einfachen Messung der Sorptionsenthaipie des Adsorbats Wasser an plattenförmigen Proben hygroskopischer Materialien.The technical problem to be solved by the invention consists in the simple measurement of the Sorptionsenthaipie the adsorbate water to plate-shaped samples of hygroscopic materials.
Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß einer horizontal liegenden diffusionsdicht abgeschlossenen Probe ein Temperaturgefälle so aufgeprägt wird, daß die Feuchtigkeitsverlagerung in der Probe infolge der Einwirkung der Schwerkraft durch die Wirkung der Sorption ausgeglichen wird. Konstante Feuchtigkeitsverteilung liegt dann vor, wenn der Dämmwert der Probe ein Minimum annimmt.According to the invention, the object is achieved in that a horizontally lying diffusion-proof completed sample, a temperature gradient is impressed so that the moisture shift in the sample due to the action of gravity is compensated by the effect of sorption. Constant moisture distribution is present when the insulation value of the sample assumes a minimum.
Dieser Zustand wird charakterisiert durch:This condition is characterized by:
grad ρ = 0 (2)degree ρ = 0 (2)
Λ grad ρ = 0 (Inkompressivilität des Wassers) (3)Λ degree ρ = 0 (incompressibility of water) (3)
-γ gradT = f (4) -γ gradT = f (4)
ρ = Dichte des Wassers in der Probeρ = density of the water in the sample
ρ = Wasserdruckρ = water pressure
Fi = spezifische SorptionsenthaipieFi = specific sorption enthalpy
T = TemperaturT = temperature
f = spezifische Kraftdichte im Schwerefeld Schwerkraft und Temperaturgradient haben die gleiche Richtung, so daß nach Gleichung {4) für die Sorptionsenthaipie gilt:f = specific force density in the gravitational field Gravity and temperature gradient have the same direction, so that according to equation {4) for the sorption enthalpy:
δχδχ
g = Erdbeschleunigungg = gravitational acceleration
Gleichung (5) dient der Berechnung der Sorptionsenthaipie bei der Temperatur T. Durch Variation des Feuchteverhaltens der Probe läßt sich zusätzlich die Abhängigkeit der Sorptionsenthaipie von der Feuchte bestimmen.Equation (5) is used to calculate the Sorptionsenthaipie at the temperature T. By varying the moisture behavior of the sample can be additionally determine the dependence of Sorptionsenthaipie of the moisture.
Die Messung der Sorptionsenthaipie wurde an einer plattenförmigen Probe aus Ziegel {p,r = 908kg m"3) der Dicke 0,0427m bei einer Mitteltemperatur von 32°C und einem Wassergehalt von 20Ma.-% durchgeführt. Das Minimum des Dämmwertes wurde bei einer angelegten Temperaturdifferenz von 0,14K gemessen.The sorption behavior was measured on a plate-shaped sample of bricks {p, r = 908kg m " 3 ) 0.0427m thick at a mean temperature of 32 ° C and a water content of 20% by mass applied temperature difference of 0.14K measured.
h = 9,806h = 9,806
λ ητλ ητ
h =912,9 ψ h = 912.9 ψ
Die Sorptionsenthaipie von 1 kg Wasser im Ziegel bei einer Feuchte von 20Ma.-% und der Temperatur von 32°C beträgt 912,9Ws.The sorption of 1 kg of water in the brick at a humidity of 20Ma .-% and the temperature of 32 ° C is 912.9Ws.
Claims (1)
Durch Differentiation dieser Kurven erhält man die Sorptionsenthaipie des Adsorbats Wasser.The sorption enthalpy of hygroscopic materials is determined on the basis of sorption isotherms. The natural logarithms of the ratio of vapor pressure to saturated steam pressure are plotted at a constant test body humidity above the reciprocal of the absolute temperature.
By differentiation of these curves one obtains the Sorptionsenthaipie the adsorbate water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DD24423882A DD226167A3 (en) | 1982-10-25 | 1982-10-25 | METHOD FOR MEASURING THE SORPTION THALPY OF HYGROSCOPIC MATERIALS |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DD24423882A DD226167A3 (en) | 1982-10-25 | 1982-10-25 | METHOD FOR MEASURING THE SORPTION THALPY OF HYGROSCOPIC MATERIALS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DD226167A3 true DD226167A3 (en) | 1985-08-14 |
Family
ID=5541952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DD24423882A DD226167A3 (en) | 1982-10-25 | 1982-10-25 | METHOD FOR MEASURING THE SORPTION THALPY OF HYGROSCOPIC MATERIALS |
Country Status (1)
| Country | Link |
|---|---|
| DD (1) | DD226167A3 (en) |
-
1982
- 1982-10-25 DD DD24423882A patent/DD226167A3/en not_active IP Right Cessation
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