On a sizzling afternoon in Southeast Asia, a parked automotive can turn into nearly insufferable inside minutes. In some circumstances, the cabin temperature can climb to 70 to 90 levels Celsius, turning the primary blast of air-conditioning right into a survival reflex quite than a consolation selection.
However air-conditioning carries its personal contradiction. It cools the within of a car, dwelling, mall, or manufacturing unit, whereas releasing warmth outdoors and drawing closely on electrical energy. In cities from Singapore and Bangkok to Manila, Jakarta, and Ho Chi Minh Metropolis, this cycle worsens peak energy demand and provides to the city warmth island impact, the place concrete, asphalt, and glass entice warmth lengthy after sundown.
Korean deep-tech startup ZERC believes a part of the reply could possibly be so simple as paint.
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Based in November 2022 as a college startup from Korea College, ZERC is commercialising a water-based radiative cooling paint that may be utilized to roofs, automobiles, ships, industrial gear, and even security helmets. The corporate was based by Lee Heon, a professor in Korea College’s Division of Supplies Science and Engineering, who has been engaged on supplies that may decrease floor temperatures with out consuming electrical energy.
“We based the corporate and have continued our analysis with a purpose to create a sensible breakthrough for the local weather disaster and power issues by means of a know-how that lowers temperature with out utilizing electrical energy,” Lee stated.
How radiative cooling works
Radiative cooling shouldn’t be a brand new concept, nevertheless it has turn into extra commercially related as international temperatures rise and electrical energy grids come beneath pressure.
The essential precept is easy. A fabric displays most incoming daylight, stopping surfaces from absorbing warmth. On the similar time, it emits thermal radiation by means of what scientists name the “atmospheric window”, a spread of infrared wavelengths that may cross by means of the environment and escape into outer house.
In sensible phrases, the floor cools down with out followers, compressors, refrigerants, or electrical energy.
ZERC says its water-based paint displays 96 per cent of daylight when utilized at a thickness of 150 micrometres, roughly the thickness of a human hair. It additionally radiates greater than 93 per cent of warmth into house by means of the atmospheric window. In checks, the paint recorded a floor temperature about 4 levels Celsius decrease than strange water-based paint.
The corporate says the cooling impact can final for greater than 5 years and that the preliminary set up value could be recovered by means of electrical energy financial savings over one summer time season. It additionally says the paint is immune to rain, wind, and daylight, an necessary requirement whether it is to maneuver past managed demonstrations and into building websites, logistics fleets, factories, and public infrastructure.
For warm and humid Southeast Asia, the place cooling is among the largest drivers of power consumption, that is the form of know-how that would appeal to consideration from constructing homeowners and municipalities. The Worldwide Power Company has warned that demand for house cooling is rising quickly, particularly in rising economies. On this area, rising incomes, urbanisation, and extra frequent heatwaves are making cooling each a public well being challenge and an power safety problem.
Why water-based paint issues
The important thing declare behind ZERC’s know-how shouldn’t be solely that it cools surfaces, however that it does so in a water-based paint format.
In response to Lee, paint-based options are more and more seen as extra sensible than movies or panels as a result of they are often utilized with rollers or sprays. Movies could be tough to put in on curved surfaces, irregular constructions, or massive areas. Paint, in contrast, matches into current building and upkeep workflows.
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The issue is that many radiative cooling paints have relied on natural solvents similar to toluene. These solvents make thick paint simpler to use and may scale back prices, however they evaporate throughout utility and drying, releasing risky natural compounds, or VOCs. VOCs are dangerous air pollution, and a few are linked to critical well being dangers.
ZERC says it has averted this by creating a proprietary formulation that mixes polymers, water, and ceramic pigments as a substitute of toluene. A polymer acts like a binder, serving to pigment particles adhere firmly to the painted floor. The ceramic pigments assist ship the optical properties wanted for daylight reflection and thermal radiation.
“Subject portray corporations are extremely delicate to cost and ease of utility in addition to eco-friendliness, so till now they’ve used toluene even when it was poisonous,” Lee stated. “We as a substitute eradicated VOC emissions on the supply by means of a know-how that mixes polymers, water, and ceramic pigments as a substitute of toluene.”
This distinction could turn into commercially necessary. Throughout Southeast Asia, governments are tightening environmental and office security requirements, however building and industrial upkeep stay extremely cost-sensitive sectors. A cooling paint that requires specialised dealing with, releases hazardous fumes, or disrupts regular utility strategies would face a tougher path to adoption.
From roofs to helmets
ZERC sees purposes wherever paint can be utilized: constructing exteriors, roofs, automobiles, ships, and industrial gear. Within the tropics, the clearest use case could also be roofs. Warehouses, factories, faculties, bus depots, and low-rise residential buildings typically take up massive quantities of photo voltaic warmth by means of rooftops, elevating indoor temperatures and growing the necessity for mechanical cooling.
Autos are one other goal. Supply vans, buses, passenger automobiles, and electrical automobiles all face heat-management challenges. For EVs specifically, lowering cabin cooling masses might help protect battery vary, a priority in sizzling markets.
Another rapid and human use case is employee safety. ZERC is exploring using radiative cooling paint on security helmets for outside employees, together with these in building, logistics, ports, and public works.
“If radiative cooling paint is utilized to employees’ security helmets in summer time, it will probably significantly enhance thermal consolation,” Lee stated. “Employees should put on security helmets for defense, however this paint can resolve the issue of sweat and discomfort contained in the helmet. I consider that is a technique superior science might help susceptible folks.”
That time is particularly related in Southeast Asia, the place outside employees are more and more uncovered to warmth stress. As heatwaves turn into extra frequent, employers and regulators are beneath strain to scale back threat with out slowing down important work. Passive cooling instruments, if reasonably priced and sturdy, might turn into a part of a broader worker-safety toolkit.
A rising climate-tech race
ZERC is getting into a market that’s already attracting startups and huge industrial gamers. Market analysis agency Spherical Insights initiatives the radiative cooling market will develop from US$35.8 billion in 2023 to US$87.7 billion in 2033, at a median annual development charge of greater than 9 per cent.
Within the US, SkyCool Programs has demonstrated electrical energy financial savings by making use of radiative cooling panels to grocery store HVAC programs. RadiaCool has labored on reducing cooling masses in electrical automobiles. Japan’s SpaceCool has put in cooling movie on buildings, together with for the Osaka Expo.
These corporations present that the sector is shifting past lab analysis. However additionally they spotlight the completely different approaches inside radiative cooling: panels, movies, coatings, and paints. ZERC’s wager is {that a} water-based paint can win in settings the place low-friction set up, employee security, and compatibility with current surfaces matter greater than extremely engineered {hardware}.
The startup can be industrial circularity. Lee just lately labored with POSCO to develop a radiative cooling paint that recycles slag, a byproduct generated when iron ore is smelted to make iron. If commercialised, that would give the know-how one other sustainability angle by turning industrial waste right into a cooling materials.
The bigger query is whether or not ZERC can transfer from scientific efficiency to industrial reliability at scale. Paint has to outlive climate, air pollution, abrasion, uneven utility, and years of publicity. Prospects can even evaluate it towards strange reflective coatings, insulation, roof retrofits, and conventional cooling programs.
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Nonetheless, the timing is beneficial. In a lot of Asia, warmth is now not a seasonal inconvenience. It’s changing into an infrastructure downside, a labour challenge, and a value burden. If ZERC can show that its water-based radiative cooling paint performs in real-world situations, it could discover demand not solely in Korea, however throughout the warmer, fast-urbanising markets of Southeast Asia.
As Lee put it, the purpose is to maneuver college deep-tech analysis “past papers and patents” and in direction of real-world issues in business, power financial savings, and carbon discount. In a warming area, that ambition can be examined not within the lab, however beneath the solar.
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