CN107619241B - Light-transmitting energy-storage concrete applied to passive solar house and preparation method thereof - Google Patents
Light-transmitting energy-storage concrete applied to passive solar house and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a light-transmitting energy storage concrete applied to a passive solar house, which comprises the following components in percentage by volume: 20-25% of light-transmitting material and 75-80% of phase change energy storage mortar, wherein the sum of the volume percentages of the components is 100%; the invention also discloses a preparation method thereof, the light-transmitting material is made into blocks and evenly fixed in the die at equal intervals, and the block light-transmitting material accounts for 20-25% of the area of the bottom plate of the die; pouring the slurry of the phase-change energy-storage mortar into a mold until the thickness of the slurry is the same as that of the block-shaped light-transmitting material, vibrating, removing the mold after hardening, and maintaining under standard conditions to a specified age to obtain the light-transmitting material. The invention solves the problems of limited indoor lighting of the heat collection and storage solar house and limited heat storage capacity of the heat collection and storage wall body in the prior art.
Description
Technical Field
The invention belongs to the technical field of civil engineering materials, relates to light-transmitting energy storage concrete applied to a passive solar house, and further relates to a preparation method of the light-transmitting energy storage concrete.
Background
The passive solar house is a direct-benefit type solar building with additional sunlight room and heat collection and storage wall, mainly utilizes solar radiation energy as a heating heat source, but is affected by intermittence and instability of the action of solar radiation heat, so that the indoor temperature is easy to generate larger fluctuation, and the indoor thermal environment quality is reduced. In order to reduce the fluctuation range of indoor temperature, the requirement on the heat storage performance of a wall body in the design of a passive solar house is far higher than that of a common heating building, particularly a heat collection and storage wall type solar building, and the requirement on the heat storage performance of a heat collection and storage wall in the south direction is higher.
On one hand, a heavy structure wall is built behind a direct benefit window, ventilation openings are respectively formed in the top and the bottom of the wall, a movable door capable of controlling air flow is arranged at the ventilation opening, and hot air between a glass window and the heat collection and storage wall can be introduced into a room by setting the opening and closing time of the ventilation openings, so that the indoor temperature level is improved, and the conventional energy consumption in the building heating process is reduced; on the other hand, the heat collection and storage wall is used as a heat storage material for heat storage and heat release, and slowly releases heat stored in the material in the daytime after the indoor temperature is reduced, so that the room temperature is kept in a comfortable range. The traditional heat collection and storage wall is mainly built by concrete, clay bricks and other heavy materials, the heavy materials have relatively large heat capacity, and compared with light materials, the heat storage capacity of the wall body can be increased, but the materials commonly used as the heat collection and storage wall have the following defects:
(1) limited heat storage capacity and influence on indoor lighting
The heat storage capacity of the heat collection and storage wall depends on the area and the volume of the wall body on the one hand and the heat storage performance of the wall body material on the other hand, the traditional material of the heat collection and storage wall mainly comprises concrete, bricks and other sensible heat storage materials, the heat capacity of the sensible heat materials is limited, the volume of the wall body has to be increased for improving the heat storage capacity of the heat collection and storage wall, and the increase of the volume of the wall body has adverse effects on the indoor area and indoor lighting of a building; different from sensible heat storage materials, the phase change materials have excellent characteristics of high heat capacity, stable temperature during phase change and the like, and the phase change materials are introduced into heat collection and storage wall materials, so that the heat storage and heat regulation capacity of a wall body can be obviously improved, and Chinese patent with patent number CN 101761150A in document 1 discloses a high-efficiency solar phase change heat storage heat collection wall structure design method, wherein the method is that phase change material plates are attached to the surface of a built-in wall body of a heat collection and storage wall channel, and the test result shows that the heat collection and storage wall system can obtain higher heat benefit than a conventional heavy material, and the advantage of utilizing the phase change energy storage materials is shown; in document 2, "research on combined application of phase change ventilation heat collection wall and passive solar house" (Rongronghui, Jilin university, 2015), a heat collection and storage solar house model is established, phase change materials are filled in cavities of hollow brick masonry to form a heat collection and storage wall, and the temperature change of each measurement point of a model room is tested to find that the heat collection and storage wall doped with the phase change materials can maintain the indoor temperature within a proper temperature range. However, the methods adopt a composite structure of a normal material and a phase-change latent heat material from the design of a heat collection and storage wall structure system, and the main material of the method is still the traditional heavy material, so that the design and construction difficulty of the heat collection and storage wall is increased. In addition, because the heat collection and storage wall is arranged on the south wall of the passive solar building, the amount of passive heat collection is closely related to the size of the heat collection area, the increase of the area of the heat collection and storage wall is beneficial to the improvement of the heat collection value, but adverse effects are brought to indoor lighting, and the traditional heavy material heat collection and storage wall and the methods in the documents 1 and 2 cannot solve the contradiction between the area of the heat collection and storage wall and the indoor lighting.
(2) The transparent concrete improves the indoor lighting effect, but the heat storage capacity is limited
In recent years, a novel concrete capable of transmitting light appears, the concrete is prepared by pre-embedding a light-transmitting material before pouring, and document 3 research on preparing light-transmitting concrete by using vitreous optical fibers (Li Yue, Long Shi concrete 2013(04):141-143) discloses a preparation method of the light-transmitting concrete, wherein cement mortar is adopted as a base material of the light-transmitting concrete, two kinds of vitreous multimode optical fibers are arranged in the cement mortar in parallel, and the light-transmitting concrete is prepared, but the optical fiber arrangement difficulty in the method is large, the operation process is complicated and complex, and the efficiency is low; document 4, study on the preparation method and mechanical properties of resin light guide concrete (petena, university of Nanchang. 2014), discloses a method for preparing light guide concrete by using resin as a light transmission material, and the study shows that the resin has good light transmission performance, wider visual angle than an optical fiber, stronger light capturing capability, high tensile strength and compressive strength, good heat resistance and wear resistance, and excellent freezing resistance. The light-transmitting property of the light-transmitting concrete is helpful for solving the contradiction between the arrangement of the heat collection and heat storage wall and the indoor lighting requirement, and technical reference is provided for the development of the heat collection and heat storage wall of the solar house.
Disclosure of Invention
The invention aims to provide light-transmitting energy-storage concrete applied to a passive solar house, and solves the problems that indoor lighting of a heat collection and storage solar house is limited and heat storage capacity of a heat collection and storage wall body is limited in the prior art.
The invention also aims to provide a preparation method of the light-transmitting energy storage concrete applied to the passive solar house.
The technical scheme adopted by the invention is that the light-transmitting energy storage concrete applied to the passive solar house comprises the following components in percentage by volume: 20-25% of light-transmitting material and 75-80% of phase change energy storage mortar, wherein the sum of the volume percentages of the components is 100%.
The light-transmitting material comprises the following components in percentage by mass: 98.4 percent of o-benzene type unsaturated polyester transparent resin, 0.7 percent of curing agent and 0.9 percent of accelerant.
The phase change energy storage mortar comprises the following components in percentage by mass: 35.0 percent of fast hardening sulphoaluminate cement with the strength grade of 42.5, 35.0 percent of quartz sand with the fineness modulus of 2.5-2.7, 0.02 percent of polycarboxylic acid high-efficiency water reducing agent, 0.08 percent of lithium carbonate, 0.1 percent of boric acid, 14.0 percent of shape-stabilized phase change material and 15.8 percent of mixing water.
The shape-stabilized phase change material comprises the following components in percentage by mass: 38.4% of low-density polyethylene, 57.7% of phase-change paraffin and 3.9% of flake graphite.
The invention adopts another technical scheme that the preparation method of the light-transmitting energy storage concrete applied to the passive solar house is implemented according to the following steps:
step 1, preparing a light-transmitting material into blocks, uniformly fixing the light-transmitting material in a mold at equal intervals, wherein the block light-transmitting material accounts for 20-25% of the area of a bottom plate of the mold;
and 2, pouring the slurry of the phase-change energy storage mortar into a mold until the thickness of the slurry is the same as that of the block-shaped light-transmitting material, vibrating, removing the mold after hardening, and curing to a specified age under standard conditions to obtain the energy storage mortar.
The preparation process of the block-shaped light-transmitting material comprises the following steps:
respectively weighing 98.4% of o-benzene type unsaturated polyester transparent resin, 0.7% of curing agent and 0.9% of accelerator according to the mass percentage, sequentially pouring the materials into a stirrer to be uniformly stirred to obtain mixed liquid, pouring the mixed liquid into a mould, and demoulding after the mixed liquid is hardened to prepare the block-shaped light-transmitting material.
The preparation process of the slurry of the phase change energy storage mortar comprises the following steps:
weighing 15.8% of mixing water, 35.0% of fast hardening sulphoaluminate cement with the strength grade of 42.5, 35.0% of quartz sand with the fineness modulus of 2.5-2.7, 0.02% of polycarboxylic acid high-efficiency water reducing agent, 0.08% of lithium carbonate, 0.1% of boric acid and 14.0% of shape-stabilized phase-change material according to the mass percentage, sequentially pouring the materials into a cement mortar stirrer, stirring for 3-5min, and uniformly mixing to obtain the self-compacting phase-change energy storage mortar slurry.
The preparation process of the shape-stabilized phase-change material comprises the following steps:
respectively weighing 38.4% of low-density polyethylene, 57.7% of phase-change paraffin and 3.9% of flake graphite by mass percent, heating and stirring to obtain a molten mass, crushing the condensed molten mass into granules, and sieving.
In the preparation process of the shape-stabilized phase change material, heating is carried out in an oil bath pool of a heat collection type magnetic stirrer, the heat collection type magnetic stirrer is adjusted to be in a low-speed stirring state, after the temperature is increased to 170-180 ℃, the low-speed stirring state is kept for 20-25min, then the high-speed stirring state is kept for 10-15min, a molten body is obtained, and the molten body is condensed at room temperature.
In the preparation process of the shape-stabilized phase-change material, a round-hole sieve with the diameter of 2.5mm is selected during sieving.
The invention has the beneficial effects that the light-transmitting energy storage concrete applied to the passive solar house is prepared by combining the light-transmitting material and the phase change energy storage mortar, wherein the phase change energy storage mortar is composed of a shape-stabilized phase change material and a cement mortar base material; the light-transmitting material is o-benzene unsaturated polyester transparent resin, so that the light-transmitting material has good light-guiding performance, stronger light-capturing capacity, wider visual angle than an optical fiber, higher tensile strength and compressive strength, better wear resistance and heat resistance and excellent freezing resistance, and the light-transmitting effect of the building is better due to the characteristics; the phase change material in the shape-stabilized phase change material is low-melting-point phase change paraffin with the phase change temperature of 20 ℃, and the low-melting-point phase change paraffin has the advantages of wide phase change temperature, high energy storage density, good chemical stability, no supercooling and phase separation, wide raw material source, low price and the like, and the phase change temperature is close to the comfortable temperature of a human body; the carrier material is low-density polyethylene (LDPE), and the low-density polyethylene has excellent ductility and flexibility compared with high-density polyethylene and other materials, so that the preparation process of the shape-stabilized phase-change material is simple, the leakage resistance is good, and the mechanical processing performance of the shape-stabilized phase-change material is strong; the cement mortar base material is composed of cement, quartz sand, a water reducing agent, a setting accelerator and a retarder, the cement is quick-hardening sulphoaluminate cement with the strength grade of 42.5, and the cement has the characteristics of high hydration speed, high early strength, stable increase of later strength and the like.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The light-transmitting energy storage concrete applied to the passive solar house comprises the following components in percentage by volume: 20-25% of light-transmitting material and 75-80% of phase change energy storage mortar, wherein the sum of the volume percentages of the components is 100%.
The light-transmitting material comprises the following components in percentage by mass: 98.4 percent of o-benzene type unsaturated polyester transparent resin, 0.7 percent of curing agent and 0.9 percent of accelerant.
The phase change energy storage mortar comprises the following components in percentage by mass: 35.0 percent of fast hardening sulphoaluminate cement with the strength grade of 42.5, 35.0 percent of quartz sand with the fineness modulus of 2.5-2.7, 0.02 percent of polycarboxylic acid high-efficiency water reducing agent, 0.08 percent of lithium carbonate, 0.1 percent of boric acid, 14.0 percent of shape-stabilized phase change material and 15.8 percent of mixing water.
The shape-stabilized phase change material comprises the following components in percentage by mass: 38.4% of low-density polyethylene, 57.7% of phase-change paraffin and 3.9% of flake graphite.
The preparation method of the light-transmitting energy storage concrete applied to the passive solar house is implemented according to the following steps:
step 1, preparing a light-transmitting material into blocks, uniformly fixing the light-transmitting material in a mold at equal intervals, wherein the block light-transmitting material accounts for 20-25% of the area of a bottom plate of the mold;
and 2, pouring the slurry of the phase-change energy storage mortar into a mold until the thickness of the slurry is the same as that of the block-shaped light-transmitting material, vibrating, removing the mold after hardening, and curing to a specified age under standard conditions to obtain the energy storage mortar.
The preparation process of the block-shaped light-transmitting material comprises the following steps:
respectively weighing 98.4% of o-benzene type unsaturated polyester transparent resin, 0.7% of curing agent and 0.9% of accelerator according to the mass percentage, sequentially pouring the materials into a stirrer to be uniformly stirred to obtain mixed liquid, pouring the mixed liquid into a mould, and demoulding after the mixed liquid is hardened to prepare the block-shaped light-transmitting material.
The preparation process of the slurry of the phase change energy storage mortar comprises the following steps:
weighing 15.8% of mixing water, 35.0% of fast hardening sulphoaluminate cement with the strength grade of 42.5, 35.0% of quartz sand with the fineness modulus of 2.5-2.7, 0.02% of polycarboxylic acid high-efficiency water reducing agent, 0.08% of lithium carbonate, 0.1% of boric acid and 14.0% of shape-stabilized phase-change material according to the mass percentage, sequentially pouring the materials into a cement mortar stirrer, stirring for 3-5min, and uniformly mixing to obtain the self-compacting phase-change energy storage mortar slurry.
The preparation process of the shape-stabilized phase-change material comprises the following steps:
respectively weighing 38.4% of low-density polyethylene, 57.7% of phase-change paraffin and 3.9% of flake graphite by mass percent, heating and stirring to obtain a molten mass, crushing the condensed molten mass into granules, and sieving.
In the preparation process of the shape-stabilized phase change material, heating is carried out in an oil bath pool of a heat collection type magnetic stirrer, the heat collection type magnetic stirrer is adjusted to be in a low-speed stirring state, after the temperature is increased to 170-180 ℃, the low-speed stirring state is kept for 20-25min, then the high-speed stirring state is kept for 10-15min, a molten body is obtained, and the molten body is condensed at room temperature.
In the preparation process of the shape-stabilized phase-change material, a round-hole sieve with the diameter of 2.5mm is selected during sieving.
Example 1
The preparation method of the light-transmitting energy storage concrete applied to the passive solar house is implemented according to the following steps:
step 1, weighing 98.4% of o-benzene type unsaturated polyester transparent resin, 0.7% of curing agent and 0.9% of accelerator according to the mass percentage, pouring the materials into a stirrer in sequence, stirring the materials uniformly to obtain a mixed solution, slowly pouring the mixed solution into a silica gel mold, and demolding the silica gel mold after the mixed solution is hardened to prepare a block-shaped light-transmitting material;
uniformly arranging the block-shaped light-transmitting materials in the mold at equal intervals, and bonding the block-shaped light-transmitting materials on the bottom plate of the mold by using quick-curing glue, wherein the block-shaped light-transmitting materials account for 20% of the area of the bottom plate of the mold;
step 2, respectively weighing 38.4% of low-density polyethylene, 57.7% of phase-change paraffin wax at 20 ℃ and 3.9% of flake graphite powder according to mass percentage, pouring the weighed materials into a beaker, putting the beaker into an oil bath pool of a heat collection type magnetic stirrer for heating, setting the temperature of the heat collection type magnetic stirrer to be 170 ℃, adjusting the heat collection type magnetic stirrer to be in a low-speed stirring state, keeping the temperature for 20min after the temperature is raised to 170 ℃, then adjusting the temperature to be in a high-speed stirring state for 10min to obtain a molten mass, mechanically crushing the molten mass into particles after the molten mass is condensed at room temperature, and sieving the particles through a 2.5mm round hole sieve to obtain a dry powder of the shaped phase-change material;
weighing 15.8% of mixing water, 35.0% of fast hardening sulphoaluminate cement with the strength grade of 42.5, 35.0% of quartz sand with the fineness modulus of 2.5, 0.02% of polycarboxylic acid high-efficiency water reducing agent (powder), 0.08% of lithium carbonate, 0.1% of boric acid and 14.0% of dry powder of a shape-stabilized phase-change material according to the mass percentage, sequentially pouring the materials into a cement mortar stirrer, stirring for 3min, and uniformly mixing to obtain the slurry of the self-compacting phase-change energy storage mortar.
Pouring the slurry of the phase-change energy-storage mortar into a mold until the thickness of the slurry is the same as that of the block-shaped light-transmitting material so as to ensure that the block-shaped light-transmitting material can penetrate through the phase-change energy-storage mortar, vibrating the block-shaped light-transmitting material, removing the mold after hardening, and maintaining the block-shaped light-transmitting material to a specified age under standard conditions to obtain the light-transmitting material.
Example 2
The preparation method of the light-transmitting energy storage concrete applied to the passive solar house is implemented according to the following steps:
step 1, weighing 98.4% of o-benzene type unsaturated polyester transparent resin, 0.7% of curing agent and 0.9% of accelerator according to the mass percentage, pouring the materials into a stirrer in sequence, stirring the materials uniformly to obtain a mixed solution, slowly pouring the mixed solution into a silica gel mold, and demolding the silica gel mold after the mixed solution is hardened to prepare a block-shaped light-transmitting material;
uniformly arranging the block-shaped light-transmitting materials in the mold at equal intervals, and bonding the block-shaped light-transmitting materials on the bottom plate of the mold by using quick-curing glue, wherein the block-shaped light-transmitting materials account for 23% of the area of the bottom plate of the mold;
step 2, respectively weighing 38.4% of low-density polyethylene, 57.7% of phase-change paraffin wax at 20 ℃ and 3.9% of flake graphite powder according to mass percentage, pouring the weighed materials into a beaker, putting the beaker into an oil bath pool of a heat collection type magnetic stirrer for heating, setting the temperature of the heat collection type magnetic stirrer to be 175 ℃, adjusting the temperature of the heat collection type magnetic stirrer to be in a low-speed stirring state, keeping the temperature for 23min after the temperature is raised to 175 ℃, then adjusting the temperature to be in a high-speed stirring state for 13min to obtain a molten mass, mechanically crushing the molten mass into particles after the molten mass is condensed at room temperature, and sieving the particles through a 2.5mm circular hole sieve to obtain a dry powder of the shape-stabilized phase-change material;
weighing 15.8% of mixing water, 35.0% of fast hardening sulphoaluminate cement with the strength grade of 42.5, 35.0% of quartz sand with the fineness modulus of 2.6, 0.02% of polycarboxylic acid high-efficiency water reducing agent (powder), 0.08% of lithium carbonate, 0.1% of boric acid and 14.0% of dry powder of a shape-stabilized phase-change material according to the mass percentage, sequentially pouring the materials into a cement mortar stirrer, stirring for 4min, and uniformly mixing to obtain the slurry of the self-compacting phase-change energy storage mortar.
Pouring the slurry of the phase-change energy-storage mortar into a mold until the thickness of the slurry is the same as that of the block-shaped light-transmitting material so as to ensure that the block-shaped light-transmitting material can penetrate through the phase-change energy-storage mortar, vibrating the block-shaped light-transmitting material, removing the mold after hardening, and maintaining the block-shaped light-transmitting material to a specified age under standard conditions to obtain the light-transmitting material.
Example 3
The preparation method of the light-transmitting energy storage concrete applied to the passive solar house is implemented according to the following steps:
step 1, weighing 98.4% of o-benzene type unsaturated polyester transparent resin, 0.7% of curing agent and 0.9% of accelerator according to the mass percentage, pouring the materials into a stirrer in sequence, stirring the materials uniformly to obtain a mixed solution, slowly pouring the mixed solution into a silica gel mold, and demolding the silica gel mold after the mixed solution is hardened to prepare a block-shaped light-transmitting material;
uniformly arranging the block-shaped light-transmitting materials in the mold at equal intervals, and bonding the block-shaped light-transmitting materials on the bottom plate of the mold by using quick-curing glue, wherein the block-shaped light-transmitting materials account for 25% of the area of the bottom plate of the mold;
step 2, respectively weighing 38.4% of low-density polyethylene, 57.7% of phase-change paraffin wax at 20 ℃ and 3.9% of flake graphite powder according to mass percentage, pouring the weighed materials into a beaker, putting the beaker into an oil bath pool of a heat collection type magnetic stirrer for heating, setting the temperature of the heat collection type magnetic stirrer to be 180 ℃, adjusting the heat collection type magnetic stirrer to be in a low-speed stirring state, keeping the temperature for 25min after the temperature is increased to 180 ℃, then adjusting the temperature to be in a high-speed stirring state for 15min to obtain a molten mass, mechanically crushing the molten mass into particles after the molten mass is condensed at room temperature, and sieving the particles through a 2.5mm round hole sieve to obtain a dry powder of the shaped phase-change material;
weighing 15.8% of mixing water, 35.0% of fast hardening sulphoaluminate cement with the strength grade of 42.5, 35.0% of quartz sand with the fineness modulus of 2.7, 0.02% of polycarboxylic acid high-efficiency water reducing agent (powder), 0.08% of lithium carbonate, 0.1% of boric acid and 14.0% of dry powder of a shape-stabilized phase-change material according to the mass percentage, sequentially pouring the materials into a cement mortar stirrer, stirring for 5min, and uniformly mixing to obtain the slurry of the self-compacting phase-change energy storage mortar.
Pouring the slurry of the phase-change energy-storage mortar into a mold until the thickness of the slurry is the same as that of the block-shaped light-transmitting material so as to ensure that the block-shaped light-transmitting material can penetrate through the phase-change energy-storage mortar, vibrating the block-shaped light-transmitting material, removing the mold after hardening, and maintaining the block-shaped light-transmitting material to a specified age under standard conditions to obtain the light-transmitting material.
The following table shows the comparison of the properties of the light-transmitting energy storage concrete prepared in example 1, example 2 and example 3 and applied to the passive solar house.
Table 1 properties of light-transmitting energy-storing concrete prepared in examples 1 to 3 and applied to passive solar house
As can be seen from Table 1, the light transmission area percentage of example 1 was 20%, the compressive strengths of 8.2MPa and 15.5MPa for 1-day curing and 3-day curing, respectively, reached 47.4% and 89.6% of the compressive strength of 28-day curing, respectively, and the enthalpy value of example 1 reached 12.5J/g; compared with the example 1, the proportion of the materials in the examples 2 and 3 is changed, the content of the light-transmitting material is increased, the light-transmitting area percentage is 23 percent and 25 percent respectively, and the content of the phase change energy storage mortar is reduced, but the strength test data shows that the materials in the examples 2 and 3 have the performance characteristics of early strength and quick hardening, and the enthalpy values of the materials are higher and are respectively 11.0J/g and 10.6J/g. The combination of the performance parameters of the three examples shows that the 1d compressive strength is 5.8-8.2 MPa; the 7d compressive strength is 12.3-15.5 MPa; the 28d compressive strength is 14.2-17.3Mpa, the strength of the light-transmitting energy storage concrete applied to the passive solar house is fast to develop, the compressive strength of the concrete in 7 days reaches the compressive strength of a common clay brick, so the strength of the concrete can meet the mechanical requirements of wall construction, wherein the latent heat of phase change mainly comes from phase change energy storage mortar, the latent heat value of phase change can reach 10.61-12.45J/g, and compared with the sensible heat storage mode adopted by common building materials, the concrete has larger heat storage capacity and can play a role in energy storage.
By the mode, the light-transmitting energy storage concrete applied to the passive solar house is prepared by combining the light-transmitting material and the phase change energy storage mortar, wherein the phase change energy storage mortar is composed of the shape-stabilized phase change material and the cement mortar base material:
the light-transmitting material is o-benzene unsaturated polyester transparent resin, so that the light-transmitting material has good light-guiding performance, stronger light-capturing capacity, wider visual angle than that of an optical fiber, higher tensile strength and compressive strength, better wear resistance and heat resistance and excellent freezing resistance, and the light-transmitting effect of the building is better due to the characteristics.
The phase change material in the shape-stabilized phase change material is low-melting-point phase change paraffin with the phase change temperature of 20 ℃, and the low-melting-point phase change paraffin has the advantages of wide phase change temperature, high energy storage density, good chemical stability, no supercooling and phase separation, wide raw material source, low price and the like, and the phase change temperature is close to the comfortable temperature of a human body; the carrier material is low-density polyethylene (LDPE), and the low-density polyethylene has excellent ductility and flexibility compared with high-density polyethylene and other materials, so that the preparation process of the shape-stabilized phase-change material is simple, the leakage resistance is good, and the mechanical processing performance of the shape-stabilized phase-change material is strong.
The cement mortar base material is composed of cement, quartz sand, a water reducing agent, a setting accelerator and a retarder, the cement is quick-hardening sulphoaluminate cement with the strength grade of 42.5, and the cement has the characteristics of high hydration speed, high early strength, stable increase of later strength and the like.
Claims (4)
1. The light-transmitting energy storage concrete applied to the passive solar house is characterized by comprising the following components in percentage by volume: 20-25% of light-transmitting material and 75-80% of phase change energy storage mortar, wherein the sum of the volume percentages of the components is 100%, and the light-transmitting material penetrates through the phase change energy storage mortar;
the light-transmitting material comprises the following components in percentage by mass: 98.4 percent of o-benzene type unsaturated polyester transparent resin, 0.7 percent of curing agent and 0.9 percent of accelerant;
the phase change energy storage mortar comprises the following components in percentage by mass: 35.0% of rapid hardening sulphoaluminate cement with 42.5 strength series, 35.0% of quartz sand with fineness modulus of 2.5-2.7, 0.02% of polycarboxylic acid high-efficiency water reducing agent, 0.08% of lithium carbonate, 0.1% of boric acid, 14.0% of shape-stabilized phase-change material and 15.8% of mixing water;
the shape-stabilized phase change material comprises the following components in percentage by mass: 38.4% of low-density polyethylene, 57.7% of phase-change paraffin and 3.9% of flake graphite.
2. The preparation method of the light-transmitting energy storage concrete applied to the passive solar house is characterized by comprising the following steps:
step 1, preparing a light-transmitting material into blocks, uniformly fixing the light-transmitting material in a mold at equal intervals, wherein the block light-transmitting material accounts for 20-25% of the area of a bottom plate of the mold;
step 2, pouring slurry of the phase-change energy storage mortar into a mold until the thickness of the slurry is the same as that of the block-shaped light-transmitting material, vibrating, removing the mold after hardening, and curing to a specified age under standard conditions to obtain the energy storage mortar;
the preparation process of the slurry of the phase change energy storage mortar comprises the following steps:
respectively weighing 15.8% of mixing water, 35.0% of fast hardening sulphoaluminate cement with the strength grade of 42.5, 35.0% of quartz sand with the fineness modulus of 2.5-2.7, 0.02% of polycarboxylic acid high-efficiency water reducing agent, 0.08% of lithium carbonate, 0.1% of boric acid and 14.0% of shape-stabilized phase-change material according to the mass percentage, sequentially pouring the materials into a cement mortar stirrer, stirring for 3-5min, and uniformly mixing to obtain a slurry material of the self-compacting phase-change energy storage mortar;
the preparation process of the shape-stabilized phase change material is as follows:
respectively weighing 38.4% of low-density polyethylene, 57.7% of phase-change paraffin and 3.9% of flake graphite according to the mass percentage, heating and stirring to obtain a molten mass, crushing the condensed molten mass into granules, and sieving;
in the preparation process of the shape-stabilized phase change material, heating is carried out in an oil bath pool of a heat collection type magnetic stirrer, the heat collection type magnetic stirrer is adjusted to be in a low-speed stirring state, after the temperature is increased to 170-180 ℃, the low-speed stirring state is kept for 20-25min, then the high-speed stirring state is kept for 10-15min, a molten body is obtained, and the molten body is condensed at room temperature.
3. The preparation method of the light-transmitting energy storage concrete applied to the passive solar house according to claim 2, wherein the preparation process of the block-shaped light-transmitting material is as follows:
respectively weighing 98.4% of o-benzene type unsaturated polyester transparent resin, 0.7% of curing agent and 0.9% of accelerator according to the mass percentage, sequentially pouring the materials into a stirrer to be uniformly stirred to obtain mixed liquid, pouring the mixed liquid into a mould, and demoulding after the mixed liquid is hardened to prepare the block-shaped light-transmitting material.
4. The method for preparing the light-transmitting energy-storage concrete applied to the passive solar house according to claim 2, wherein a 2.5mm round-hole screen is selected during the preparation of the shape-stabilized phase-change material.
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| 石蜡/LDPE相变储能材料的研究;王玮;《硕士学位论文》;20111231;第12、21-23、55-56、61、63页 * |
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