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A calculation method for converting latent heat of phase transition of frozen soil into equivalent specific heat

A phase change latent heat and calculation method technology, applied in the direction of material heat development, investigation stage/state change, etc., can solve the problem that the equivalent specific heat of frozen soil cannot be obtained directly, and achieve the effect of convenient calculation and improved accuracy

Active Publication Date: 2018-12-04
TIANJIN CHENGJIAN UNIV
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Problems solved by technology

It can be seen that neither the direct method nor the indirect method can directly obtain the equivalent specific heat of frozen soil

Method used

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  • A calculation method for converting latent heat of phase transition of frozen soil into equivalent specific heat
  • A calculation method for converting latent heat of phase transition of frozen soil into equivalent specific heat
  • A calculation method for converting latent heat of phase transition of frozen soil into equivalent specific heat

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Embodiment

[0035] The dry density is determined to be 1.8g / cm2 through experiments 3 , with a water content of 15.8%, d s The unfrozen water content of the silty clay sample at -1°C, -2°C, -3°C is 2.72, and the dry density is determined to be 1.8g / cm by mixing calorimetry test 3 , d s The specific heat and content of soil particles in the silty clay sample of 2.72, and the mass content of each phase in the soil.

[0036] Obtaining the true specific heat C of permafrost based on the weighted average method k It is 1.338kJ / kg·℃, which is the value calculated by the traditional method.

[0037] Using a proposed calculation method to convert the latent heat of phase change of frozen soil into equivalent specific heat, the calculation is shown in Table 1. Calculated and obtained the specific heat C' of frozen soil at -2°C k It is 2.094kJ / kg·℃.

[0038] Table 1 Calculation of conversion of latent heat of phase change into equivalent specific heat of a frozen soil

[0039] item ...

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Abstract

A calculation method for converting latent heat of phase transition of frozen soil into equivalent specific heat is provided. The method includes solving latent heat of phase transition of two adjacent temperature zones to calculate frozen soil specific heat of the two adjacent temperature zones; and on this basis, acquiring equivalent specific heat of frozen soil at a demarcation point of the twoadjacent temperature zones through a manner of averaging specific heat of the two adjacent temperature zones and adding the average value and actual specific heat of the demarcation point of the twoadjacent temperature zones. The method converting the latent heat of phase transition of frozen soil into the equivalent specific heat is provided and the method takes differences among the equivalentspecific heat, the average specific heat and the actual specific heat of the frozen soil into account. Measurement and calculation prove that the prediction precision of the method is increased by 84.7% than that of traditional methods, and therefore, the latent heat of phase transition of frozen soil can be converted into equivalent specific heat to the utmost, providing convenience for calculation of a frozen soil temperature field.

Description

technical field [0001] The invention belongs to the field of specific heat calculation in the frozen soil field, in particular to a frozen soil equivalent specific heat calculation method considering phase change latent heat, which can be used to convert the phase change latent heat of frozen soil into the equivalent specific heat of soil. Background technique [0002] The latent heat of phase change in permafrost refers to the heat released or absorbed during the phase transition between liquid water and solid ice in the soil. The specific heat value of a substance corresponding to a certain temperature is the true specific heat. In engineering, the average value of the specific heat within a certain temperature is often used as the specific heat of the object, which is the average specific heat of the object. The equivalent specific heat is the ratio of the heat absorbed (released) by a unit mass of a material with a phase change to a certain temperature during the phase ...

Claims

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Application Information

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IPC IPC(8): G01N25/20G01N25/06
CPCG01N25/06G01N25/20
Inventor 陈之祥李顺群王杏杏张翻夏锦红高凌霞潘林
Owner TIANJIN CHENGJIAN UNIV
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