Thermal Mitigation of the Indoor and Outdoor Climate by Green Curtains in Japanese Condominiums
Abstract
:1. Introduction
1.1. Overview of the Study
1.2. Previous Studies of Green Curtains in Japan
1.3. The Objectives of this Study
2. Research Methodology
2.1. Studied Area and Climate
2.2. The Representative of Housing Stock in Japan
2.3. Studied Building and Profile of Households
2.4. Thermal Measurement
3. Results and Discussion
3.1. Comparison of the Globe Temperature with Air Temperature in the Balcony
3.2. Balcony Temperature in Various Stages
3.3. Influence of Air-Conditioner-Usage Time and Balcony Temperature by a Green Curtain
3.4. Indoor and Balcony Thermal Environment With and Without Air-Conditioner Usage
3.5. Comparison with Other Studies
4. Conclusions
- (1)
- The thermal mitigation effect of the green curtain significantly increased from the 1st stage to the 3rd stage;
- (2)
- The air-conditioner-usage time of the households with green curtains was 40% less than that of the households without green curtains;
- (3)
- The balcony globe temperature of the households with green curtains was 0.6 °C lower than that of the households without green curtains, during the air-conditioner usage;
- (4)
- If the balcony temperature is lower than the indoor air temperature, the air-conditioner usage is significantly lower in households with green curtains.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Reference | Investigated Buildings | Investigated Space | Investigation Period | Thermal Mitigation Effect | |
---|---|---|---|---|---|
Maki et al. [18] | | | Classroom (University) | 22–26 Sep. 2011 | Indoor air temperature decreased by up to 1 °C. |
Nakamura et al. [19] | | | Classroom (University) | 11 – 19 Aug. 2012 | The average indoor air temperature decreased by 0.7 °C. |
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Suzuki et al. [21] | | | Classroom (University) | 4–17 Aug. 2013 | The maximum indoor air temperature decreased by 2.1 °C. |
Narita et al. [22] | | | Classroom (Primary school) | 21 Aug.–10 Sept. 2006 | The maximum indoor air temperature decreased by 4.0 °C. |
Okushima et al. [23] | | Institute | 23 Jul.–8 Aug. 2012 | The maximum indoor surface temperature decreased by 4.0 °C. | |
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Kato et al. [25] | | | Condominium | 8 Aug.–16 Sept. 2011 | Green curtains tend to be cooler than bamboo blinds. |
Green Curtain | ID | Floor | Orientation of Balcony | Horizontal Position of Flat | Family Number | Age (year) | ||
---|---|---|---|---|---|---|---|---|
Husband | Wife | Child | ||||||
With | G1 | 2 | West | North corner | 2 | 37 | 35 | - |
G2 | 5 | West | South corner | 2 | 33 | 34 | - | |
Without | N1 | 3 | South | Southeast corner | 3 | 36 | 32 | 3 |
N2 | 6 | South | Southeast corner | 3 | 39 | 38 | 3 |
Trade Name | Measurement Variable | Range | Accuracy |
---|---|---|---|
TR74Ui | Air temperature | 0–55 °C | ±0.5 °C |
TR-52i | Globe temperature | −20–80 °C | ±0.3 °C |
Tgb-Tob (°C) | 1st Stage | 2nd Stage | 3rd Stage | |||
---|---|---|---|---|---|---|
with Green Curtain | without Green Curtain | with Green Curtain | without Green Curtain | with Green Curtain | without Green Curtain | |
Number | 4608 | 4608 | 4608 | 4608 | 4608 | 4608 |
Average (°C) | 0.3 | 0.7 | 0.2 | 0.8 | 0.1 | 0.7 |
S. D. (°C) | 0.7 | 0.6 | 0.6 | 0.9 | 0.4 | 0.9 |
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Share and Cite
Abe, H.; Rijal, H.B.; Hiroki, R.; Iijima, K.; Ohta, A. Thermal Mitigation of the Indoor and Outdoor Climate by Green Curtains in Japanese Condominiums. Climate 2020, 8, 8. https://doi.org/10.3390/cli8010008
Abe H, Rijal HB, Hiroki R, Iijima K, Ohta A. Thermal Mitigation of the Indoor and Outdoor Climate by Green Curtains in Japanese Condominiums. Climate. 2020; 8(1):8. https://doi.org/10.3390/cli8010008
Chicago/Turabian StyleAbe, Hiroto, Hom B. Rijal, Ryoga Hiroki, Kentaro Iijima, and Akira Ohta. 2020. "Thermal Mitigation of the Indoor and Outdoor Climate by Green Curtains in Japanese Condominiums" Climate 8, no. 1: 8. https://doi.org/10.3390/cli8010008
APA StyleAbe, H., Rijal, H. B., Hiroki, R., Iijima, K., & Ohta, A. (2020). Thermal Mitigation of the Indoor and Outdoor Climate by Green Curtains in Japanese Condominiums. Climate, 8(1), 8. https://doi.org/10.3390/cli8010008