Design of Thermal Insulation Materials with Different Geometries of Channels
Abstract
:1. Introduction
- (a)
- fibrous insulations, which consist in fibers with small diameter and air within the interspaces. The fibers can be in parallel or perpendicular to the surface being insulated and can be either interconnected or loose. The fibers used are silica, glass, mineral wool, slag wool and alumina silica fibers. The most used insulations of this type are glass fibers and mineral wool [5,6,7].
- (b)
- (c)
- granular insulations, which are composed of small nodules that contain voids. They are not really cellular materials, since gases can be transferred between the individual spaces. This type of insulation can be produced as bulk material or in combination with a binder and fibers in order to obtain a rigid insulation. Some examples are calcium silicate, expanded vermiculite, perlite, cellulose, diatomaceous earth and expanded polystyrene [10,11,12].
2. Materials, Methods and Equipment
2.1. Materials
2.2. Methods
2.2.1. The Analytical Description of the Thermal Conductivity
The Mathematical Model Applied to the Panels with Perforated Horizontal Channels
The Mathematical Model Applied to the Panels with Partly Perforated Channels
The Mathematical Model Applied to the Panels with Perforated Inclined Channels with an Angle α
2.2.2. Experimental Setup
3. Results and Discussion
3.1. Analytical Models
3.2. Experimental Results
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Code of Panel | Mass m (kg) | Density ρ (kg/m3) | Dimensions | ||
---|---|---|---|---|---|
Length (m) | Width (m) | Thickness (m) | |||
P0 | 0.311 | 28.79 | 0.6 | 0.6 | 0.03 |
P1 | 0.302 | 27.96 | 0.6 | 0.6 | 0.03 |
P2 | 0.308 | 28.51 | 0.6 | 0.6 | 0.03 |
P3 | 0.303 | 28.05 | 0.6 | 0.6 | 0.03 |
P4 | 0.300 | 27.77 | 0.6 | 0.6 | 0.03 |
Hot Plate Temperature (°C) | Cold Plate Temperature (°C) | Average Temperature (°C) | The Absolute Value of the Temperature Difference between the Two Control Thermocouples (°C) |
---|---|---|---|
−10 | 20 | 5 | 30 |
10 | 20 | 15 | 10 |
35 | 20 | 27.5 | 15 |
Average Temperature (°C) | The Absolute Value of the Temperature Difference Δt (°C) | |||||
---|---|---|---|---|---|---|
P0 | P1 | P2 | P3 | P4 | ||
5 | 30 | 0.03363 | 0.03376 | 0.03362 | 0.03364 | 0.03367 |
15 | 10 | 0.03552 | 0.03556 | 0.03550 | 0.03557 | 0.03543 |
27.5 | 15 | 0.03818 | 0.03821 | 0.03815 | 0.03807 | 0.03808 |
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Șova, D.; Stanciu, M.D.; Georgescu, S.V. Design of Thermal Insulation Materials with Different Geometries of Channels. Polymers 2021, 13, 2217. https://doi.org/10.3390/polym13132217
Șova D, Stanciu MD, Georgescu SV. Design of Thermal Insulation Materials with Different Geometries of Channels. Polymers. 2021; 13(13):2217. https://doi.org/10.3390/polym13132217
Chicago/Turabian StyleȘova, Daniela, Mariana Domnica Stanciu, and Sergiu Valeriu Georgescu. 2021. "Design of Thermal Insulation Materials with Different Geometries of Channels" Polymers 13, no. 13: 2217. https://doi.org/10.3390/polym13132217
APA StyleȘova, D., Stanciu, M. D., & Georgescu, S. V. (2021). Design of Thermal Insulation Materials with Different Geometries of Channels. Polymers, 13(13), 2217. https://doi.org/10.3390/polym13132217