Temperature Evaluation of a Building Facade with a Thin Plaster Layer under Various Degrees of Cloudiness
Abstract
:1. Introduction
2. Study Object
3. Methodology
- (1)
- The measured heating temperature of the outer surface of the wall, tmeas °C, designed according to the FHIC system, located in the building, and the air temperature at the outlet under the canopy in the shadows, tout, °C, were measured during 28 days of the warm period of 2019. The measurements were carried out on the device ITP-MG 4.03/20(I) “POTOK” with a minimum interval of 15 min. Limits of permissible additional temperature measurement error caused by the temperature deviation of the electronic unit from 20 °C (for every 10 °C of deviation) were ±0.05 °C.
- (2)
- The total radiation Ivertical (x,y) (the sum of direct and scattered solar radiation), entering the investigated section of the wall in one hour, was calculated as follows, W/m2:
- (3)
- The absorption coefficient of solar radiation (the ratio of the value of the flux of solar radiation absorbed by the sample to the value of the flux of solar radiation normally incident on the sample) was calculated based on the assumption that there is no transmitted component of solar radiation, so it is only necessary to determine the reflection coefficient of the finished coating of the wall under study with the FHIC system.
4. Results and Discussion
4.1. Processing of Meteorological Data
- Group I—These are free-of-cloudiness days and days with slight cloudiness. These days, direct radiation is practically, or not at all, obscured by clouds—5 days.
- Group II—These are the days on which cloudiness with gaps and average cloudiness is observed. These days, direct radiation is partially obscured, partially present—16 days.
- Group III—These are days with 100% cloudiness. On these days there is no direct radiation—7 days.
4.2. Correlation between Measured and Calculated Heating Temperature for Wall Surfaces under Different Irradiation Conditions
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Experimental Day | Group ID | Max (tmeas − tout), °C | Experimental Hour/Cloudiness (Points) | , °C | Shorisontal/Dhorisontal | ƩShorisontal/ƩDhorisontal |
---|---|---|---|---|---|---|
8 | 1 | 9.2 | 12 a.m./2 | 6.8 | 9.8 | 9.2 |
9 | 1 | 8.5 | 11 a.m./0 | 6.4 | 9.6 | 9.29 |
11 | 1 | 8.9 | 12 a.m./2 | 6.3 | 10.6 | 9.37 |
17 | 1 | 7.9 | 11 a.m./1 | 5.4 | 6.23 | 4.52 |
18 | 1 | 8.7 | 12 a.m./2 | 5.9 | 4.14 | 3.26 |
1 | 2 | 8.5 | 12 a.m./8 | 4.4 | 3.17 | 2.27 |
2 | 2 | 8.9 | 11 a.m./3 | 4.9 | 3.08 | 2.44 |
3 | 2 | 5.3 | 3 p.m./9 | 1.7 | 2.51 | 0.61 |
4 | 2 | 6.8 | 2 p.m./12 | 2.8 | 2.68 | 1.06 |
5 | 2 | 6.5 | 12 a.m./12 | 4.7 | 0.88 | 0.94 |
6 | 2 | 6.7 | 1 p.m./7 | 4.3 | 3.54 | 2.02 |
7 | 2 | 6.1 | 1 p.m./8 | 4.6 | 1.02 | 1.14 |
14 | 2 | 6.2 | 2 p.m./7 | 2.6 | 1.37 | 0.61 |
15 | 2 | 7.2 | 12 a.m./6 | 4,4 | 1.95 | 1.66 |
16 | 2 | 7.3 | 12 a.m./4 | 3.9 | 4.31 | 1.27 |
19 | 2 | 5.6 | 10 a.m./6 | 3.6 | 2.21 | 1.09 |
20 | 2 | 6.4 | 12 a.m./7 | 4.2 | 1.23 | 0.76 |
21 | 2 | 7.9 | 12 a.m./5 | 5.5 | 3.49 | 1.41 |
22 | 2 | 7.3 | 12 a.m./8 | 5.7 | 4.29 | 5.62 |
23 | 2 | 7.8 | 12 a.m./12 | 5.1 | 3.83 | 2 |
28 | 2 | 7.1 | 12 a.m./9 | 3.8 | 0.78 | 0.45 |
10 | 3 | 2.1 | 12 a.m./10 | 1.3 | 0 | 0.08 |
12 | 3 | 4.3 | 11 a.m./8 | 1.3 | 0.02 | 0.29 |
13 | 3 | 4 | 12 a.m./10 | 2.6 | 0.02 | 0.09 |
24 | 3 | 3.1 | 11 a.m./10 | 2.2 | 0 | 0.09 |
25 | 3 | 1.2 | 10 a.m./10 | 0.7 | 0 | 0.02 |
26 | 3 | 0.4 | 9 a.m./10 | 0.2 | 0 | 0 |
27 | 3 | 0.6 | 11 a.m./10 | 0.3 | 0 | 0 |
H value | 20.9 | - | 13.6 | 22.8 | 10.6 | |
Significance level, p | <0.05 | - | <0.05 | <0.05 | <0.05 |
Time of Day, Hour | Average Difference between the Measured and Calculated Temperature, , °C | ||
---|---|---|---|
Group I, ni = 5 | Group II, ni = 16 | Group III, ni = 7 | |
7 | −2.4 | −1.9 | −0.9 |
8 | −0.8 | −1 | −0.7 |
9 | −0.3 | −0.2 | −0.2 |
10 | 0.3 | −0.2 | −0.1 |
11 | 0.8 | −0.2 | 0.3 |
12 | 0.7 | 0.1 | 0 |
13 | 1.2 | 0.4 | 0 |
14 | 0.9 | −0.1 | −0.3 |
15 | 1.7 | 0.5 | −0.3 |
16 | 0.4 | −0.2 | −0.4 |
17 | −0.1 | −0.3 | −0.3 |
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Korkina, E.V.; Gorbarenko, E.V.; Voitovich, E.V.; Tyulenev, M.D.; Kozhukhova, N.I. Temperature Evaluation of a Building Facade with a Thin Plaster Layer under Various Degrees of Cloudiness. Energies 2023, 16, 5783. https://doi.org/10.3390/en16155783
Korkina EV, Gorbarenko EV, Voitovich EV, Tyulenev MD, Kozhukhova NI. Temperature Evaluation of a Building Facade with a Thin Plaster Layer under Various Degrees of Cloudiness. Energies. 2023; 16(15):5783. https://doi.org/10.3390/en16155783
Chicago/Turabian StyleKorkina, Elena V., Ekaterina V. Gorbarenko, Elena V. Voitovich, Matvey D. Tyulenev, and Natalia I. Kozhukhova. 2023. "Temperature Evaluation of a Building Facade with a Thin Plaster Layer under Various Degrees of Cloudiness" Energies 16, no. 15: 5783. https://doi.org/10.3390/en16155783
APA StyleKorkina, E. V., Gorbarenko, E. V., Voitovich, E. V., Tyulenev, M. D., & Kozhukhova, N. I. (2023). Temperature Evaluation of a Building Facade with a Thin Plaster Layer under Various Degrees of Cloudiness. Energies, 16(15), 5783. https://doi.org/10.3390/en16155783