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.

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 Cooling".

Technology introduction video

Demonstration Tests

Our engineers are conducting precise research and demonstration tests 
to allow clients to fully experience excellent safety, comfort, 
and economy of SPACECOOL.
They are carrying out research and testing on a daily basis 
so that everyone can use the product without worry.

1 Grows cool 
under the blazing sun! 
Summer performance

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

  • • 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)

3 Proof of Concept (PoC)

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
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
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
  • • It felt cooler than outside.
  • • It was hot, but I could probably stay inside a long time.
  • • I want to get out as soon as possible.
  • • 3 minutes is my limit. It feels dangerous.
  • • I can't stop sweating.

*2 Skin temperature (measured at head)

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.

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.