CN111208168B - Method for capturing damp-surging heat exchange phenomenon of porous medium soil body - Google Patents
Method for capturing damp-surging heat exchange phenomenon of porous medium soil body Download PDFInfo
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- CN111208168B CN111208168B CN202010112944.3A CN202010112944A CN111208168B CN 111208168 B CN111208168 B CN 111208168B CN 202010112944 A CN202010112944 A CN 202010112944A CN 111208168 B CN111208168 B CN 111208168B
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Abstract
The invention relates to a method for catching the tidal surge heat exchange phenomenon of a porous medium soil body, which comprises the following steps of firstly adding water into the porous medium soil body to moisten the porous medium soil body until liquid water is filled in pores; the method can fill the blank of research on soil body tidal surge heat exchange and reveal the soil phase change heat exchange characteristic to a certain extent, and the method relates to fewer objects, is simple and convenient in experimental method, only needs to measure whether the heat flow density value has step mutation or not, and is easy to observe and judge.
Description
Technical Field
The invention relates to a method for capturing a soil heat accumulation and release phenomenon, in particular to a method for capturing a tidal surge heat exchange phenomenon caused by phase change condensation and large heat release due to rapid temperature drop of gas in pores of a porous medium.
Background
At present, the research on the phase change condensation heat exchange of the soil body is very little. The only relevant studies exist in the building envelope condensation phenomenon studies, and students represented by the university of Hunan and the university of Shenyang buildings reveal the occurrence mechanism of the ground building envelope condensation phenomenon from the temperature reduction and the change of the water vapor partial pressure. In addition, shanghai university clearly indicates that the current research on the latent heat effect of soil water vapor is quite lack, and the sufficient understanding on the phase change heat exchange characteristic of soil is lacked. Therefore, a method and a result for monitoring and capturing the heat flow density of the wall surface of the station hall layer of the subway station in a long term are needed to be provided, and an important theoretical basis is provided for explaining that the temperature of the underground space such as the subway station hall in autumn and winter with obvious outdoor temperature drop is kept relatively stable.
Disclosure of Invention
The invention provides a method for capturing a porous medium soil body tidal surge heat exchange phenomenon, which is used for filling the blank of the research on the soil body tidal surge heat exchange in an underground space and revealing the phase change heat exchange characteristic of soil to a certain extent; the method has fewer related objects and is simple and convenient in experimental method, only the heat flow density value needs to be measured to determine whether step mutation occurs, and observation and judgment are easy.
In order to achieve the purpose, the technical scheme of the invention is as follows: a method for capturing the tidal surge heat exchange phenomenon of a porous medium soil body is characterized by comprising the following steps:
step 1: adding water into the porous medium soil body to moisten the porous medium soil body until liquid water is filled in pores;
and 2, step: heating the soil body to enable water in the soil body to exist in soil body pores in a vapor gas form;
and step 3: arranging a heat flow densimeter on the surface of the soil body, and then suddenly reducing the air around the soil body, or the surface of the soil body, or the overall temperature of the soil body to be below the saturation temperature corresponding to the partial pressure of water vapor in the soil body;
and 4, step 4: when the heat flow density value displayed by the heat flow densimeter arranged on the surface of the soil body generates a step surge phenomenon, the phenomenon of the soil body surge heat exchange of the porous medium is represented.
Further, in the step 1, water is added into the soil body with the porous medium to moisten the soil body until the pores are filled with liquid water, wherein the porous medium is one of the soil body, the rock, the plant root and the plant stem.
Further, in the step 2, the soil body is heated by being exposed to the sun or blowing hot air to the periphery of the soil body by using a fan heater, or the soil body is heated integrally.
Further, in the step 3, the air around the soil body is suddenly reduced to be below the saturation temperature corresponding to the water vapor partial pressure in the soil body, and the soil body is placed in a refrigerator or the air side contacted with the soil body is subjected to rapid temperature reduction treatment; the temperature reduction requirement is that the gas in the pores of the porous medium soil body reaches the saturation temperature under the corresponding water vapor partial pressure in a short time, so that condensation phenomenon occurs, and a large amount of latent heat is released.
Compared with the prior art, the invention has the following beneficial effects:
the invention fills the blank of the research on the tidal surge heat exchange of the soil body in the underground space, and the research is as follows:
1. the phase change heat exchange characteristic of the soil is revealed to a certain extent;
2. the invention provides a simpler and more convenient capturing method, which relates to fewer objects and is simple and convenient in experimental method, only needs to measure whether the heat flow density value has step mutation, and is easy to observe and judge;
3. the invention provides a method for capturing soil body tidal surge heat exchange, which has important reference value for subsequent phase change heat exchange researches such as soil body porous medium tidal surge and the like.
Drawings
FIG. 1 is a graph of outdoor air and platform air temperature over time;
FIG. 2 is a graph of the density value of heat flow on the wall surface of a soil body along with the change of time.
Detailed Description
The present invention will be further illustrated with reference to the following examples and the accompanying drawings, and the method of practicing the invention includes, but is not limited to, the following examples.
The invention discloses a method for capturing a tidal surge heat exchange phenomenon of a porous medium soil body, which comprises the following steps of:
step 1: adding water into the porous medium soil body to moisten the porous medium soil body until liquid water is filled in pores; the porous medium is one of soil, rock, plant root and stem.
Step 2: the soil body is heated by exposing in the sun or blowing hot air around the soil body by a fan heater or the whole soil body is heated, so that the moisture in the soil body exists in the pores of the soil body in the form of vapor gas.
And step 3: arranging a heat flow densimeter on the surface of the soil body, then leading the air around the soil body, or leading the surface of the soil body, or leading the overall temperature of the soil body to be suddenly reduced to be lower than the saturation temperature corresponding to the partial pressure of water vapor in the soil body, and putting the soil body in a refrigerator or carrying out rapid temperature reduction treatment on the air side contacted with the soil body; the temperature reduction requirement is that the gas in the pores of the porous medium soil body reaches the saturation temperature under the corresponding water vapor partial pressure in a short time, so that the condensation phenomenon occurs, and a large amount of latent heat is released.
And 4, step 4: when the heat flow density value displayed by the heat flow densitometer arranged on the surface of the soil body has a step surge phenomenon, the phenomenon of soil body surge heat exchange of the characterization porous medium occurs.
In this embodiment: to capture the known conditions of the soil mass tidal surge heat exchange embodiment: the experimental date is 2016, 1 and 24 days, the weather is clear, the experimental site is a train station of a subway with No. 11 line from Shanghai, the train station is provided with three entrances and exits, from 30 in the morning to 23 in the evening, the wall temperature, the wall heat flux density and the air temperature are measured every two hours, the positions of the measuring points are described as the following measuring points 1, namely outdoor air temperature measuring points, measuring points 2 and 3 are respectively positioned near the stairs of the No. 1 entrances and exits, measuring points 8 and 9 are respectively positioned near the stairs of the No. 2 entrances and exits, measuring points 4,5,6,7, 10, 11, 12, 13 and 14 are respectively positioned near the side wall of a station hall layer of the subway station, measuring points 15 and 16 are positioned near the stairs between the station hall layer and the station floor, and measuring point 17 is positioned near the station floor.
Step 1: according to geological exploration, the subway station is located 5m below the ground in the Shanghai, a large amount of underground water permeates around the soil body, and the requirement of the step 1 that the porous medium of the soil body contains water is met.
And 2, step: the experiment is carried out in autumn and winter, and through the whole hot summer, the moisture in the soil body porous medium of the subway station surrounding rock shield exists in pores of the soil body porous medium in a gas form due to the effects of solar irradiation and summer outdoor temperature rise.
And step 3: continuously monitoring the parameter changes of heat flow density measuring points 3, 4,5,6,7, 8,9, 10, 12, 14, 16 and 17 at intervals of 2 hours on the soil wall surface of the station, and suddenly reducing the outdoor air temperature measuring point to 14.8 ℃ (measured at 23 pm;
and 4, step 4: from the measured change of the heat flow density of the soil (see fig. 2), it can be seen that the ratio of the mass flow rate at 21: the thermal current density value is subjected to step sharp increase phenomenon (the single-digit W/square meter in other time periods increases the hundred digits rapidly several W/square meter) is used, namely the phenomenon of soil mass tidal surge and heat exchange captured in the field actual measurement work of the subway station.
In addition, the rising of the temperature of the near-wall station hall air at the test day 21.
Claims (3)
1. A method for capturing the tidal surge heat exchange phenomenon of a porous medium soil body is characterized by comprising the following steps:
step 1: adding water into the porous medium soil body to moisten the porous medium soil body until liquid water is filled in pores;
step 2: heating the porous medium soil body to enable water in the porous medium soil body to exist in pores of the porous medium soil body in a vapor gas form;
and step 3: arranging a heat flow densimeter on the surface of the porous medium soil body, and then leading the air around the porous medium soil body, or leading the surface of the porous medium soil body, or leading the overall temperature of the porous medium soil body to suddenly drop below the saturation temperature corresponding to the partial pressure of water vapor in the porous medium soil body;
and 4, step 4: when the heat flow density value displayed by the heat flow densimeter arranged on the surface of the porous medium soil body has a step surge phenomenon, the phenomenon of the porous medium soil body surge heat exchange is represented.
2. The method for capturing the tidal surge heat exchange phenomenon of the porous medium soil body as claimed in claim 1, wherein the method comprises the following steps: in the step 2, the porous medium soil body is heated by being exposed to the sun or blowing hot air to the periphery of the porous medium soil body by using a fan heater, or the porous medium soil body is integrally heated.
3. The method for capturing the tidal surge heat exchange phenomenon of the porous medium soil body as claimed in claim 1, wherein the method comprises the following steps: in the step 3, the ambient air of the porous medium soil body is suddenly reduced to be lower than the saturation temperature corresponding to the partial pressure of water vapor in the porous medium soil body, and the porous medium soil body is placed in a refrigerator or the air side contacted with the porous medium soil body is subjected to rapid temperature reduction treatment; the temperature reduction requirement is that the gas in the pores of the porous medium soil body reaches the saturation temperature under the corresponding water vapor partial pressure in a short time, so that condensation phenomenon occurs, and a large amount of latent heat is released.
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| CN113515803B (en) * | 2021-09-14 | 2021-12-03 | 中国矿业大学(北京) | Method and system for evaluating heat transfer and storage of surrounding rocks of subway under action of periodic surface temperature and wind temperature |
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| CN101344347A (en) * | 2008-08-25 | 2009-01-14 | 南京大学 | Heat pipe ground source heat pump system |
| CN105911092A (en) * | 2016-06-02 | 2016-08-31 | 上海理工大学 | Experiment device for researching underground space top soil heat accumulation and release evolution laws |
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| CN101090766B (en) * | 2004-11-03 | 2010-06-09 | 维罗西股份有限公司 | Partial boiling in mini and micro-channels |
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| JPS61228293A (en) * | 1985-04-02 | 1986-10-11 | Atsuo Yoshida | Underground storage of heat by hygroscopic substance |
| CN101344347A (en) * | 2008-08-25 | 2009-01-14 | 南京大学 | Heat pipe ground source heat pump system |
| CN105911092A (en) * | 2016-06-02 | 2016-08-31 | 上海理工大学 | Experiment device for researching underground space top soil heat accumulation and release evolution laws |
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