How to Use
Air-Conditioner
Efficiently
W202005-3
Tennoji High School Attached toOsaka Kyoiku University

Difference from 1991-2020 average(℃)

Posing a Problem
Global average temperature
anomalies・Thin line (black): averagetemperature deviation from thebase value for each year
・Thick line (blue): 5-year
moving average of deviation
・Straight line (red): long-termchange trend.
The base value is the 30-year
average for the period 1991-2020.

JMAyearfigure： Global average temperature anomalies
authority： Japan Meteorological Agency, Various data andmaterials,2022 https://www.data.jma.go.jp/cpdinfo/temp/an_wld.html

Posing a Problem
World temperatures
are getting hotter

Economydevelopment

Demand for Air-Conditioners
Grows Worldwide

Air-Conditioner
penetration increases

Electricity Supply
Total:28,466 TWhcoal

natural energy
gas
nuclear power

petroleum
otherfigure： Global Power Supply Composition 2021
authority：Renewable Energy Foundation, Statistics,
International Energy, 2020, https://www.renewableei.org/statistics/energy/?cat=electricity

Negative Cycle

Hot !!

UseAir-Conditioner

Globalwarming

CO₂ emissions

Use a lot ofelectricity

To Stop the Negative CycleIndividuals need to save electricity
Hot !!

Globalwarming

Use
Air-Conditioner

10% power savings when
set temperature 1℃ up⤴

CO₂ emissions

Use a lot ofelectricity

authority: ITmediaNEWS,https://www.itmedia.co.jp/news/articles/2203/22/news114.html#:~:text=%E3%82%A8%E3%82%A2%E3%82%B3%E3%83%B3%E3%81%AE%E7%AF%80%E9%9B%BB%E6%96%B9%E
6%B3%95%E3%81%A8%E3%81%97%E3%81%A6,%E3%81%AE%E5%AF%BE%E7%AD%
96%E3%82%92%E7%B4%B9%E4%BB%8B%E3%81%97%E3%81%9F%E3%80%82

Want to keep cool in terms of heatstroke！

Targetelectricity
conservation

coolnessExperiments in Japan[ Hypothesis ]① The circulator should be facing outward

authority ： Iris Plaza
https://www.irisplaza.co.jp/med
ia/A13904790995② The placebo effect may make you feel cooler

Experiments in Japan[method ]We set the room temperature at 26℃ or 28℃ in five of our classrooms.
①Place a circulator near the window facing outward or inward.
② The room temperature was not told or was told as
26 or 28℃. (Only setting at 28℃)
A control experiment was conducted under these conditions, and theparticipants responded to a questionnaire.

Results and Discussion①
Relationship between the direction of the circulator andthe feeling temperature
100%

Ratio

80%
60%

40%
20%
0%
外向き
outward

cold
寒い(%)

内向き
inwardhot
暑いcomfortable
ちょうどいいOutward : "hot" people decreased and "cold" people increased→ Cooler if the circulator is facing outward

Results and Discussion②
100%

Relationship between told temperature and feelingtemperature

80%

Ratio

60%

40%

20%

0%

26 26℃
told ascold
寒い(%)

28 28℃told ashot
暑い

伝えない
not
toldcomfortable
ちょうどいいWhen told as 28℃, “hot” people increase and “comfortable” people decrease compered to 26℃→When the told temperature is low, more people feel comfortable

The placebo effect may be observed.

Conclusion in Japan① Cooler if the circulator is facing outward② Placebo effect likely to make you feel cooler

Application to the World｛① Circulate air

・internal air circulation(outside＞inside)・external air circulation(inside＞outside)high lowlowhighwindow
openclose

internal air circulation

external air circulationlowApplication to the World② Placebo effect
Adopt and effective in any region③ Use dry function in humid area
Low humidity→ Low feeling temperatureauthority: Panasonic,
https://panasonic.jp/life/air/170014.html

Future Outlook
We don't yet know if its application to the world will be effective→Conduct experiments in areas with different humidity, daylightand wind levels.

Create role models

Thank you for listening