KR20180001546A - Heat storage properties enhanced sspcm concrete and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a method for preparing a concrete material applied with a shape-stabilized phase-change material (SSPCM) for enhanced heat storage performance. The method includes the steps of: generating an SSPCM based on a fatty acid by stabilizing a phase-change material (PCM) based on the fatty acid; generating a mixed cement material by mixing cement and water; mixing the SSPCM based on the fatty acid with the mixed cement material; and solidifying and curing the mixed cement material mixed with the SSPCM based on the fatty acid to prepare a construction concrete material. Accordingly, the heat storage concrete material can lower the peak temperature of a building and enable time-lag effects for maintaining the thermal inertia within a comfortable temperature range while using the PCM based on the fatty acid to be eco-friendly and cost-efficient.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a phase-

The present invention relates to a phase-stable phase-change material-applied concrete having improved heat storage performance, and more particularly to a concrete with a phase-stable phase-change material having improved thermal storage performance in response to development of a building material having high thermal performance, And a manufacturing method thereof.

At present, the world is making efforts to prevent global warming caused by greenhouse gas (GHG), which is caused by energy depletion caused by human activities and carbon dioxide (CO ₂ ). Therefore, measures to reduce energy and reduce carbon dioxide (CO ₂ ) emissions are very important issues at national and international level. Accordingly, along with the Convention on Climate Change, greenhouse gas reduction through energy conservation has become a global trend, and since buildings account for 35% of total greenhouse gas emissions, energy saving in buildings has a great influence on the reduction of total CO2. It goes crazy.

Meanwhile, in recent years, there has been a growing demand for comfort in the indoor environment in accordance with changes in the housing culture and the living environment in Korea. Therefore, it is time to develop convergence technology to conserve energy of the building and to maintain the comfort of the indoor environment. Such technology can be largely divided into cooling and heating and insulation technology. The Korean house is a traditional seating structure, which uses the floor heating system through the hot water circulation system to increase the surface temperature of the indoor wall, thereby reducing the radiative heat of the occupant.

In order to increase the comfort of radiant heating, it is necessary to constantly supply the heating heat of the room to lower the temperature difference between the floor and the indoor air, and in the case of cooling, if the constant air temperature in the room can not be controlled, the discomfort greatly increases. Therefore, the energy problem due to excessive operation of the radiator and the cooler is a great concern.

Recently, there is a growing interest in energy conservation, and there is an active movement to develop high thermal efficiency building materials in the building sector, which accounts for a large portion of energy consumption. Among them, a latent heat storage type energy storage method using a phase change material (PCM), which is one of materials that effectively store thermal energy, is attracting attention.

A phase change material is a material whose phase changes according to a change in temperature, and has a property of accumulating thermal energy in the form of latent heat when the material changes from a solid to a liquid or from a liquid to a solid. Latent heat is the heat absorbing or releasing due to the change of the state of the material. It is characterized by a very high thermal energy storage efficiency compared with the sensible heat due to the temperature change.

The research on the application of the phase change material as a heat storage material to buildings using the high heat storage performance has been progressing actively both domestically and abroad. However, since the phase change material may cause leakage during the phase change from solid to liquid or from liquid to solid, the phase change material itself is difficult to apply to the structure itself and must be phase stabilized to prevent it.

 "Preparation and Thermal Characterization of SSPCM Mixed Concrete with Enhanced Heat Storage Performance", Journal of the Korean Solar Energy Society, Journal of the Korean Solar Energy Society v.35  Min Ha, "A Study on the Mechanical Properties and Optimum Mixture Design of SSPCM Mixed Concrete", Dissertation (MS), Graduate School of Ewha Womans University

Accordingly, it is an object of the present invention to provide a method for manufacturing a phase-stable phase change material-applied concrete having improved heat storage performance.

Another object of the present invention is to provide a phase-stable phase change material-applied concrete having improved heat storage performance.

In accordance with one embodiment of the present invention for achieving the object of the present invention, a phase-stable phase-change material-applied concrete having improved heat storage performance is prepared by phase stabilizing a phase change material (PCM) Creating a Shape-Stabilized Phase Change Material (SSPCM); Mixing cement and water to produce a cement admixture; Mixing the fatty acid phase stable phase change material with the cement admixture; And solidifying and curing the cement admixture mixed with the fatty acid-based phase change material to form a concrete for construction.

In an embodiment of the present invention, the fatty acid-based phase change material may comprise at least one of coconut oil and palm oil.

In an embodiment of the present invention, the fatty acid phase change material is selected from the group consisting of corn oil, cottonseed oil, peanut oil, olive oil, palm kernel oil, rapeseed oil, canola oil, sesame oil, soybean oil, sunflower oil, castor oil, linseed oil, And the like.

In the embodiment of the present invention, the step of phase-stabilizing the fatty acid phase change material (PCM) to generate a fatty acid-based phase change material (SSPCM) And impregnating the phase stable phase change material with the reforming carbon.

In the embodiment of the present invention, the step of phase-stabilizing the fatty acid phase change material (PCM) to generate a fatty acid-based phase change material (SSPCM) Impregnating the exfoliated graphite nanoplate (xGnP) with the fatty acid phase-change material; Filtering the undoped phase change material using a filter paper made of glass fiber; And vacuum drying the peeled graphite nanoplate impregnated with the phase change material.

In an embodiment of the present invention, the step of mixing the cement with water to produce the cement admixture may comprise a water to cement ratio of 30%.

In the embodiment of the present invention, the step of mixing the fatty acid-based phase-change material with the cement admixture may include mixing the fatty acid-phase phase-change material at a ratio of 10 wt% to 30 wt% with respect to the cement mass .

The concrete according to one embodiment of the present invention for realizing the above-mentioned object of the present invention can be manufactured by a method of manufacturing a phase-stable phase change material-applied concrete improved in heat storage performance.

According to another aspect of the present invention, there is provided a phase-stable phase change material-applied concrete having improved heat storage performance, comprising a phase-change material (phase change material; PCM) Shape-Stabilized Phase Change Material (SSPCM); And a cement admixture comprising cement and water mixed with the fatty acid phase stable phase change material, wherein the fatty acid phase stable phase change material comprises exfoliated graphite nanoplate (xGnP) material.

In an embodiment of the present invention, the fatty acid-based phase change material may comprise at least one of coconut oil and palm oil.

In an embodiment of the present invention, the fatty acid phase change material is selected from the group consisting of corn oil, cottonseed oil, peanut oil, olive oil, palm kernel oil, rapeseed oil, canola oil, sesame oil, soybean oil, sunflower oil, castor oil, linseed oil, And the like.

In an embodiment of the present invention, the water to cement ratio may be 30%.

In an embodiment of the present invention, the fatty acid phase stable phase change material may be mixed at a ratio of 10 wt% to 30 wt% with respect to the cement mass.

According to the concrete with the phase-stable phase-change material having improved heat storage performance, the latent heat performance is remarkably improved (about 4 times) compared with the conventional concrete, and the thermal conductivity, time lag effect and peak temperature reduction effect are also improved . Accordingly, when a heat source is supplied through floor radiant heating as in the case of the present invention, a phase change material is applied to a concrete slab forming a floor and a ceiling, thereby reducing cooling and heating costs and building comfort in a building. Also, the concrete using the phase-stable phase change material according to the present invention is eco-friendly by using the fatty acid phase-change material and is economical because it can lower the manufacturing cost compared to the paraffinic phase-change material.

1 is a flowchart of a method for manufacturing a phase-stable phase change material-applied concrete having improved heat storage performance according to an embodiment of the present invention.
2 is a table showing the characteristics of coconut oil and palm oil.
3 is a SEM image of coconut oil SSPCM impregnated with xGnP.
4 is a SEM image of palm oil SSPCM impregnated with xGnP.
5 is a table showing the FT-IR spectra and the range of coupling waves.
6 is a graph showing FT-IR spectra of SSPCM prepared according to the present invention.
7 is a graph showing the thermal conductivity of coconut oil impregnated with xGnP.
8 is a graph showing the thermal conductivity of palm oil impregnated with xGnP.
9 is a table showing the thermal conductivity and the increasing rate of SSPCM, coconut oil and palm oil produced according to the present invention.
10 is a graph showing the thermal characteristics of coconut oil SSPCM impregnated with xGnP.
11 is a graph showing the thermal properties of palm oil SSPCM impregnated in xGnP.
FIG. 12 is a table showing the thermal characteristics of SSPCM, coconut oil and palm oil produced according to the present invention when fused.
FIG. 13 is a table showing the thermal characteristics of SSPCM, coconut oil and palm oil produced according to the present invention during cooling.
14 is a graph showing the thermal stability of coconut oil SSPCM impregnated with xGnP.
15 is a graph showing the thermal stability of coconut oil.
16 is a graph showing the thermal stability of palm oil SSPCM impregnated with xGnP.
17 is a graph showing the thermal stability of palm oil.
18 is a photograph of a thermal storage concrete specimen used in the measurement of the present invention.
19 is a graph showing an analysis of enthalpy results of the heat storage concrete produced according to the present invention.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

1 is a flowchart of a method for manufacturing a phase-stable phase change material-applied concrete having improved heat storage performance according to an embodiment of the present invention.

The present invention provides an environmentally friendly, low-cost fatty acid phase change material (PCM) to a floor slab and a ceiling concrete slab, which are most widely used in the field of construction, do.

1, the phase-stable phase-change material-containing concrete of the present invention has improved heat storage performance, and has a phase-stabilized phase change material (PCM) Change Material (SSPCM) (Step S10).

A phase change material is a material whose phase changes according to a change in temperature, and has a property of accumulating thermal energy in the form of latent heat when the material changes from a solid to a liquid or from a liquid to a solid. Latent heat is the heat absorbing or releasing due to the change of the state of the material. It is characterized by a very high thermal energy storage efficiency compared with the sensible heat due to the temperature change.

A study on the application of the phase change material as a heat storage material to a building utilizing the high heat storage performance possessed by the phase change material is being actively carried out domestically. However, since the phase change material may leak during the phase transition from solid to liquid or from liquid to solid, there is a focus on phase stabilization techniques to prevent this. In other words, phase stabilization is essential to apply phase change materials to buildings.

In order to apply a phase change material to a building, it is necessary to know the characteristics of the phase change material according to the properties and classification. The phase change material is basically capable of accumulating or releasing heat to reduce the heating and cooling load in the building and perform its own role, so that the thermodynamic properties of the phase change material are very important in the application of the structure. Even with the same phase change material, the efficiency of latent heat is better.

Each phase-change material has different melting and freezing points for each type. Therefore, applying a phase change material that causes a phase change in a pleasant temperature range experienced by the occupant, a great effect can be obtained in terms of energy. However, there is a disadvantage that the price is still expensive. Fatty acid-based phase change materials belong to organic phase change materials, and their prices are relatively inexpensive.

In one embodiment, the fatty acid-based phase change material may be at least one of coconut oil and palm oil. The physical properties of coconut oil and palm oil at room temperature are shown in Fig.

The fatty acid phase change material may be at least one of corn oil, cottonseed oil, peanut oil, olive oil, palm kernel oil, rapeseed oil, canola oil, sesame oil, soybean oil, sunflower oil, castor oil, linseed oil, safflower oil, But are not limited to, fatty acid phase change materials may be selected as needed.

The fatty acid-based phase change material can be phase stabilized by a vacuum impregnation method in which the modified carbon is impregnated. For example, the fatty acid phase stable phase change material may be impregnated with exfoliated graphite nanoplate (xGnP) to include exfoliated graphite nanoplate (xGnP) material.

Specifically, in order to prepare the phase-stable phase-change material first, the phase change material may first be impregnated with xGnP. At this time, the impregnation of the phase change material with xGnP can allow xGnP to be immersed in the liquid phase change material. Meanwhile, the impregnation is preferably performed for about 20 to 40 minutes in order to sufficiently impregnate the xGnP phase change material.

After impregnating the phase change material with xGnP, the undoped phase change material can be filtered. At this time, it is possible to filter using a filter paper made of glass fiber to filter the nano-sized material and the nano-sized xGnP and the phase change material not impregnated. The filtration size of the filter paper is preferably 0.1 to 2 탆.

It is preferable to use two to four sheets of the filter paper in a stacked manner. This is because the nanoparticles can be prevented from escaping from the filtering process and the filter paper can be prevented from being torn when compared with the case where only one filter paper is used. On the other hand, when using multiple layers of filter paper, each filter paper can have different filtration sizes. By adding the filtering step, the phase change material that has not been impregnated can be collected in the filter paper, and the phase change material that has not been impregnated can be recycled.

After the filtering process, the xGnP impregnated with the phase change material can be vacuum dried. In this case, the vacuum drying is preferably performed at a temperature of about 60 to 100 ° C. for about 20 to 80 hours. The oily properties of the phase change material can be removed through drying for about 20 hours or more, and the effect of preventing evaporation of the phase change material can be obtained by performing drying in a vacuum state.

SEM measurement was performed to analyze the morphology of fatty acid phase change materials prepared by vacuum impregnation method. Figures 3 and 4 show SEM images of xGnP after coconut oil and palm oil are impregnated. Referring to FIGS. 3 and 4, it can be seen that coconut oil and palm oil are evenly dispersed among the particles of xGnP.

In order to investigate the interactions between fatty acid-based phase-change materials and carbon nanomaterials, we investigated the intermolecular chemical bonding of fatty acid-based phase-change materials through FT-IR analysis. Representative peak points of pure coconut oil and palm oil are shown at 2920 and 2851 cm ^-1 , and as shown in FIG. 5, they represent -CH 3 and -CH 2 groups of the ester, respectively. In addition, the number of waves in the range of 1740 and 1149-1157 cm ^-1 represents the C = O, CO group, respectively.

6, the peaks of SSPCM and coconut oil impregnated with coconut oil and palm oil in xGnP are identical to those of palm oil. This indicates that no chemical bonding between coconut oil, palm oil, and carbon nanomaterial occurs, but only physical bonding. Therefore, it can be confirmed that the two materials maintain a stable state without changing their inherent physical properties even after mixing.

In order to overcome the problem of low thermal conductivity, the thermal conductivity of coconut oil and palm oil SSPCM impregnated with xGnP was measured using TCi after impregnating xGnP, which is a porous carbon nanomaterial with high thermal conductivity, with coconut oil and palm oil. The melting point of coconut oil and palm oil was lower than room temperature and the temperature was measured at 9 ℃.

The thermal conductivity of coconut oil SSPCM impregnated with xGnP was about 1.3303 W / mK, which was about 414% higher than the thermal conductivity of pure coconut oil of 0.3210 W / mK. The thermal conductivity of palm oil SSPCM impregnated in xGnP was about 1.2638 W / m · K, which was about 437% higher than that of pure palm oil, 0.2891 W / m · K. Both SSPCM showed an increase rate of more than 400%, and the low thermal conductivity was increased by 4 times by impregnating xGnP, which is a high thermal conductivity carbon nano material, as shown in FIG. 7 and FIG. The thermal conductivity and the rate of increase of SSPCM, coconut oil and palm oil produced are shown in Fig.

On the other hand, DSC analysis can be used to evaluate the thermal performance of coconut oil and palm oil, coconut oil impregnated in xGnP, palm oil melting point, cooling point and latent heat. Referring to FIG. 10, it can be seen that pure coconut oil has a phase change peak at 7.34 ° C. upon cooling and a peak at 23.14 ° C. at temperature rise. The heat flow of coconut oil impregnated with xGnP exhibited a peak at 10.84 ° C during cooling and 22.67 ° C at elevated temperature and showed a trend similar to that of pure coconut oil except for a slight error. In addition, since the difference between the melting point and the cooling point was maintained to be similar, there was no concern about the supercooling phenomenon.

Referring to FIG. 11, pure palm oil had a phase change peak at 7.89 ° C and 1.60 ° C during cooling and a peak at 8.60 ° C and 0.02 ° C at the time of temperature rise. The heat flux of palm oil impregnated with xGnP exhibited a peak at 5.52 ℃ and -1.08 ℃ during cooling and a peak at 6.82 ℃ and -1.83 ℃ during heating. Similar trends were observed with coconut oil.

The amount of latent heat and the rate of change of latent heat, which are calculated by integrating the peak value of the cooling point and the melting point and the heat flow, are shown in FIGS. 12 and 13. The cooling point of coconut oil impregnated with xGnP was 14.95 ° C and the melting point was 26.93 ° C. The cooling point of pure coconut oil was 14.76 ° C and the melting point was almost the same at 26.78 ° C.

The palm oil impregnated with xGnP also had a similar cooling point of 9.20 ° C and a melting point of 18.33 ° C. The cooling palette of 8.55 ° C and 17.26 ° C of pure palm oil showed almost the same tendency. This is because the original thermal performance was maintained because no chemical reaction occurred between coconut oil and xGnP.

The cooling capacity of coconut oil SSPCM impregnated with xGnP was 77.64 J / g at cooling and 82.34 J / g at fusion, and when the pure coconut oil was compared, the latent heat of cooling was 105.0 J / g, 110.4J / g, which is about 25%. In the case of palm oil SSPCM impregnated with xGnP, the latent heat of cooling was 33.58 J / g and the latent heat of fusion was 77.18 J / g. In case of pure palm oil, the latent heat of cooling was 53.75 J / g, / g, which showed a decrease rate of about 38%. It is analyzed that the 3D net structure of xGnP interferes with the heat flow of PCM, which causes the decrease of latent heat of PCM.

The thermal stability of the fatty acid phase change material can be evaluated by TGA analysis. As a result of the analysis, the coconut oil and palm oil SSPCM impregnated in xGnP can be judged as pyrolyzed by raising the temperature from 20 ° C to 600 ° C.

14 shows the TGA curve of coconut oil SSPCM impregnated with xGnP. Pyrolysis started at about 245 ° C., and when the temperature was higher than about 420 ° C., only the coconut oil SSPCM impregnated with xGnP remained in the mixture. Since xGnP is almost pure carbon nano material and is not pyrolyzed in the TGA temperature range performed in this study, pyrolyzed material is coconut oil, and coconut oil impregnated in xGnP is 76.07%. It can be seen that similar tendency is shown when compared with the analysis result of the thermal stability of the pure coconut oil of FIG.

16 shows the TGA curve of palm oil SSPCM impregnated with xGnP. Pyrolysis started at about 260 ° C. When the temperature exceeds about 480 ° C, only palm oil SSPCM impregnated with xGnP remained in the mixture. Since xGnP is not pyrolyzed in the temperature range in which TGA analysis was performed, the pyrolyzed material is considered to be palm oil, and the palm oil impregnated with xGnP is 80.07%. It can be seen that the thermal stability analysis results of the pure palm oil of FIG. 17 show a similar tendency.

As a result, the coconut oil and palm oil SSPCM impregnated in xGnP do not cause mass change in the temperature range of 100 ° C or less, and therefore, they are considered to have thermal stability when applied to buildings.

In step S10, a fatty acid-based phase change material is produced, and cement and water are mixed to produce a cement admixture (step S30).

However, the step of generating the fatty acid-based phase change material (step S10) may be performed before or simultaneously with the step of generating the cement admixture (step S30).

* When mixing cement and water, mixing ratio of cement and water can be selected from 1: 0.3 ~ 1: 1. According to one embodiment of the present invention, the water may be mixed at a ratio of 30% of the cement.

After mixing cement and water, the cement admixture can be cured for a period of time. In order to increase the viscosity of the cement admixture, curing the cement admixture for a predetermined period of time may mean curing the admixture until the cement admixture has a viscosity of not less than a predetermined value, rather than curing the mixture to a solid state. Depending on the cement, the time taken to have a viscosity above a certain value may be different.

When the cement admixture is formed (step S30), the fatty acid-based phase change material is mixed with the cement admixture (step S50). In this case, mixing the fatty acid-based phase change material with the cured cement admixture may mean mixing the fatty acid-phase phase change material at a ratio of 10 wt% to 30 wt% with respect to the cement mass. For example, the fatty acid phase stable phase change material may be mixed at a ratio of 10 wt%, 20 wt% and 30 wt% with respect to the cement mass.

The cement admixture mixed with the fatty acid phase stable phase change material is solidified and cured to form a concrete for construction (step S70). At this time, a mold can be used. For example, a slump value of 120 mm, a maximum aggregate size of 25 mm and an air volume of 1.5 can be produced.

In one embodiment, the heat storage concrete size can be manufactured using a cylindrical specimen mold having a diameter of 6 cm and a height of 12 cm. After mixing, it can be cured under water for 28 days to finally produce heat storage concrete. 18 is a photograph of a thermal storage concrete specimen used in the measurement of the present invention.

In step S70, a cement admixture mixed with the fatty acid-based phase change material may be added to a mold previously prepared according to the size and shape of the concrete to be made. Next, the cement admixture mixed with the above-mentioned fatty acid phase stable phase change material, which has been put into the mold, can be condensed and cured.

At this time, curing the cement admixture mixed with the fatty acid phase stable phase change material may mean completely curing the cement admixture until the cement admixture becomes solid, unlike the step S30. Finally, the cement admixture mixed with the cured fatty acid phase stable phase change material is demolded from the mold to produce a building concrete having improved heat storage performance.

In order to test the performance of the building concrete with improved heat storage performance according to the present invention, the specific heat value was calculated based on the DSC analysis results and the enthalpy was calculated. The analysis was carried out with mixed concrete of 0, 10, 20 and 30 wt% SSPCM.

FIG. 19 shows the enthalpy results according to the mixing ratio of the heat storage concrete. Referring to FIG. 19, it can be seen that the final enthalpy is the highest as the amount of SSPCM is increased. When the temperature was raised to 80 ° C, it was confirmed that the enthalpy of ordinary concrete was 398.83 J / g. In the case of concrete with 10 wt% SSPCM, it was confirmed that it was 459.64 J / g. In the case of storage concrete mixed with SSPCM of 20 wt% and 30 wt%, enthalpy values of 602.77 J / g and 716.67 J / g, respectively Respectively.

The important point is that the enthalpy value has risen significantly at the time of the phase change of PCM. That is, in the phase change temperature range, the amount of heat of the heat increases greatly, and the total enthalpy value increases. Also, it can be seen that the slope of concrete with SSPCM is larger in the sensible section. It can be seen that the enthalpy sum until the SSPCM reaches the phase change section at 0 ° C becomes larger. In the future concrete application, PCM with various phase change temperatures can be applied to improve the heat storage performance.

The SSPCM which overcomes the phase leakage and the low thermal conductivity according to the present invention is applied to the concrete, thereby improving the heat storage performance of the concrete. The heat-accumulating concrete thus produced can reduce the peak temperature of the building and provide a time-rack effect to maintain the thermal inertia in a comfortable temperature range. Also, the concrete using the phase-stable phase change material according to the present invention is eco-friendly by using the fatty acid phase-change material and is economical because it can lower the manufacturing cost compared to the paraffinic phase-change material.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims. You will understand.

Research on energy saving performance when phase change material is applied to a building is actively proceeding, and many research results have already been presented about its effect. By applying the phase change material to each structure or building finishing material of the building at this point, it is considered that the present invention can be utilized in the market of the building material related industry or the energy related industry in the future.

Claims (7)

Phase stabilization phase material (Phase Change Material (PCM) to form a fatty acid phase change phase change material (SSPCM);
Preparing a cement admixture by mixing cement and water, and curing the cement admixture for a predetermined time to have a viscosity of a predetermined value or more before being solidified;
Mixing the fatty acid phase stable phase change material with the cement admixture;
A cement admixture in which the fatty acid phase stable phase change material is mixed is introduced into a preformed mold and the cement admixture mixed with the fatty acid phase stable phase change material put into the mold is solidified and solidified, Forming a building concrete; And
Demolding the cement admixture mixed with the cured fatty acid-based phase-change phase-change material from the mold,
The step of phase-stabilizing the fatty acid phase change material (PCM) to generate a fatty acid-based phase change material (SSPCM)
Impregnating the modified carbon with the fatty acid-based phase-change phase-change material; And
And a step of filtering the phase change material which has not been impregnated by using a filter paper made of a glass fiber material and filtering the plurality of filter paper having different filtration sizes so as to collect and recycle the undamaged phase change material, This improved method of manufacturing concrete with a phase change material of stable phase. The method according to claim 1,
Wherein the fatty acid phase change material comprises at least one of coconut oil and palm oil. The method according to claim 1,
Wherein the fatty acid phase change material comprises at least one of corn oil, cottonseed oil, peanut oil, olive oil, palm kernel oil, rapeseed oil, canola oil, sesame oil, soybean oil, sunflower oil, castor oil, linseed oil, safflower oil, A method for manufacturing a concrete with a phase - stable phase change material with improved heat storage performance. The method of claim 1, wherein the step of impregnating the modified carbon with the fatty acid-
Wherein the fatty acid phase change material is impregnated in an exfoliated graphite nanoplate (xGnP) in a vacuum state. The method according to claim 1, wherein the step of phase-stabilizing the fatty acid phase change material (PCM) to form a fatty acid-based phase change material (SSPCM)
And vacuum drying the peeled graphite nanoplate impregnated with the phase change material. The method for producing a phase-stable phase-change material according to claim 1, The method of claim 1, wherein mixing the cement and water to produce a cement admixture comprises:
Wherein said water and cement ratio is 30%. The method of claim 1, wherein mixing the fatty acid phase stable phase change material with the cement admixture comprises:
Wherein the fatty phase stable phase change material is mixed at a ratio of 10 wt% to 30 wt% with respect to the cement mass.

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