TECHNIQUESResearch and Techniques Discharge Heat into Space
and Block Sunlight

SPACECOOL Insists Upon Gentleness
for People, business, and the Environment
While the heat and warmth bestowed upon the Earth
by our Sun provide countless benefits,
overly hot environments are also harsh on human beings.
Humans have invented a variety of technologies in order to live better,
and these have given us abundant and convenient lives.
But at the same time,
they have given rise to numerous energy problems.
At SPACECOOL, we have given thought to the way our society should be from here out.
And we are pursuing technologies aimed at more efficiently and
effectively achieving low-carbon/decarbonization goals.
Numerous repeated tests gave birth to SPACECOOL, a material seeking
to protect people, business, and the environment from intensely hot summer environments.
Let's take a look at the technologies it incorporates.
SPACECOOL's
Radiative sky
Cooling Technology
Aims to Realize
Low-carbon/Decarbonization Goals
We were looking for a way to create a safe and comfortable living environment in response to the hotter environments on late. What we found, was a technology known as "Radiative Sky Cooling".





Technology introduction video
1 Grows cool
under the blazing sun!
Summer performance
- Summary
- Test comparing the reverse-side temperature of a steel plate painted with solar reflective paint, and another coated with SPACECOOL.
- Test period
- September 01, 2017
Solar reflective paint SPACECOOL

Reverse-side Temperature of Solar Reflective
Paint Vs. Radiative Sky Cooling Material*

Cf) Solar reflective paint: Ambient air temperature +10 to 20°C, Steel plate: Ambient air temperature +40 to 50°C
*Reverse-side temperature of steel plates painted
with solar reflective paint, and SPACECOOL

2 Highly durable UV resistance
- Summary
-
- • We used a Xenon Weather Meter
by Suga Test Instruments Co., Ltd. - • The test conditions were set with reference
to JIS Standard K5600-7-7. - ・Clear weather conditions:
180 W/m2, Black body temperature of 89°C, 50% humidity, 1 hrs 42 mins - ・Rainy conditions:
180 W/m2, Tank temperature of 38°C, 90% humidity, 18 mins - ・Reference:
Accelerated 18x through UV conversion. (486 hrs: Equivalent to 1 year)
- • We used a Xenon Weather Meter


3 Proof of Concept (PoC)
- Summary
- The radiative sky cooling material was used for prefabricated houses, tents, trucks, containers, and the like, and its effectiveness evaluated.
- Test period
- From July 2020

3-A
Providing Value to People (Heat Stroke Prevention)
We conducted tests of radiative sky cooling tents compared to normal white tents.
We confirmed a difference of about -10°C in apparent temperature.* 1 *1 While the forehead temperatures of the subjects in the tents made from radiative sky cooling material were about body temperature, those in the regular tents were around 40°C. Thus, we confirmed a large difference in apparent temperature.

Apparent Temperature (Black body temperature)

Radiative Sky Cooling Tent | Regular White Tent | |
---|---|---|
Thermography | ![]() |
![]() |
Subject A | 36.5°C*2 | 40.0°C*2 |
Subject B | 35.5°C*2 | 40.5°C*2 |
Subject C | 36.0°C*2 | 40.5°C*2 |
Subject D | 36.0°C*2 | 40.5°C*2 |
Subject E | 36.0°C*2 | 40.0°C*2 |
Impressions |
|
|
*2 Skin temperature (measured at head)
3-B
Providing Value to Business
White storage sheds were wrapped in radiative sky cooling material for the test.
• Roof temperature: 20°C cooler than white cabinet.
• Temperature inside shed: Up to 10°C lower than initial conditions.
Up to 6°C lower temperature compared to storage shed fully insulated with glass wool as thermal solutions.


3-C
Providing Value to Society (Energy conservation)
We applied radiative sky cooling materials to prefabricated houses for use at construction sites, and compared their electricity consumption with that of an untreated unit.
Electricity consumption from 9:00 AM to 5:00 PM was reduced 20% by presence of radiative sky cooling materials.


