What companies conducted the radiative cooling paint demonstration project at the Hakata Port Bayside Museum?

Radi-Cool Japan Co., Ltd. and Idemitsu Energy Solutions Co., Ltd. conducted the demonstration project at the Hakata Port Bayside Museum in Fukuoka City.

What was the maximum reduction in roof surface temperature observed during the demonstration project?

The maximum reduction in roof surface temperature observed during the demonstration project was 34.3°C after applying the Radi-cool paint.

What was the average reduction in air conditioning power consumption across five test cases in the project?

The average reduction in air conditioning power consumption across five test cases was 18.1% after the application of Radi-cool paint.

What temperature reduction was recorded in the attic space of the museum following the paint application?

A temperature reduction of up to 9.7°C was recorded in the attic space of the Hakata Port Bayside Museum after painting with Radi-cool.

Radi-Cool Radiative Cooling Paint Reduces Air Conditioning Power Consumption by Up to 31.7%

Q: How much did air conditioning power consumption decrease at the Hakata Port Bayside Museum after using Radi-cool paint?

Air conditioning power consumption decreased by up to 31.7% under strict meteorological comparison conditions after applying Radi-cool paint.

Published Mar 30, 2026 9:00 PM ・ Updated Jun 17, 2026 9:10 AM ・ 9 min read ・ Source: PR TIMES

Radi-Cool Japan and Idemitsu Energy Solutions conducted a demonstration project at the Hakata Port Bayside Museum to test the energy-saving performance of 'Radi-cool' radiative cooling paint. The results confirmed a maximum reduction of 31.7% in air conditioning power consumption under strict meteorological comparison conditions.

Radi-Cool Japan Co., Ltd. (Headquarters: Chuo-ku, Tokyo) and Idemitsu Energy Solutions Co., Ltd. (Headquarters: Chiyoda-ku, Tokyo) are pleased to announce the results of a demonstration project regarding the energy-saving performance of the radiative cooling paint "Radi-cool," conducted at the "Hakata Port Bayside Museum" in Fukuoka City. In this project, we confirmed that air conditioning power consumption was reduced by up to 31.7% under strict meteorological comparison conditions (described below).

▲ Before painting the roof of the Hakata Port Bayside Museum ▲ After painting the roof of the Hakata Port Bayside Museum

Background and Purpose of the Demonstration Project Fukuoka City has set a challenge goal of achieving net-zero greenhouse gas emissions by fiscal year 2040 and is promoting the reduction of energy consumption and greenhouse gas emissions in public and private facilities. Since many buildings in port areas have structures susceptible to the influence of sunlight, we conducted this demonstration project to verify the energy-saving effects and as an initiative toward decarbonization.

Key Results of the Demonstration Project: Correlation Between Temperature Suppression and Power Reduction Confirmed The results of this project confirmed a reduction of up to 34.3°C in roof surface temperature and up to 9.7°C in attic space temperature. Furthermore, regarding air conditioning power consumption, when compared under identical meteorological conditions (global solar radiation ±0.3 MJ/day, maximum temperature difference less than ±1.0°C), a reduction of up to 31.7% was confirmed, with an average reduction of 18.1% (across 5 cases) before and after painting.

▲ Roof surface temperature measurement status before and after painting (thermal camera) ▲ Trends in global solar radiation, maximum temperature, and attic space temperature ▲ Comparison of daytime power consumption under identical meteorological conditions

Synergistic Factors Supporting Energy-Saving Effects: Heat Dissipation Characteristics at Night Due to Radiative Cooling A factor contributing to the high energy-saving effect is the characteristic of "continuing to dissipate heat even at night." Because the space remained in a pre-cooled state until the following morning, the startup power load was reduced, which is believed to have contributed significantly to energy savings.

Future Outlook Following the results of this demonstration at Hakata Port, we will provide this as a concrete solution that goes beyond "heat countermeasures." - Accelerate energy conservation in public facilities, contributing significantly to achieving regional carbon neutrality goals. - Achieve both direct cost suppression through reduced air conditioning power consumption and improved corporate value through Scope 2 emission reductions. - Improve labor environments and enhance employee safety through heatstroke prevention due to the cooling effect reaching the attic space.

About the Radiative Cooling Material "Radi-Cool" By combining conventional high solar reflectance technology with high heat dissipation technology, this material prevents heat storage on the product surface and enables the absorption and radiation of heat from the underside. This achieves both improved energy efficiency with zero energy and the maintenance of a comfortable indoor environment. We offer paint, film, and fabric products.

Company Overview Radi-Cool Japan Co., Ltd. Representative: Jun He, President and CEO Address: Nano Park, 5F Kisuke Nihonbashi Muromachi Building, 4-4-3 Nihonbashi Muromachi, Chuo-ku, Tokyo Industry: Development, manufacturing, and sales of Radi-Cool radiative cooling materials Capital: 100 million yen URL: https://www.radi-cool.jp/ Online Shop: https://radi-cool.shop/ * Radi-Cool Japan Co., Ltd. is an affiliate of Taihe Industrial Co., Ltd.

[Inquiries regarding this matter] ■ Radi-Cool Japan Co., Ltd. Public Relations Department Inquiries: Please use the "Inquiry Form" on our website.

Idemitsu Energy Solutions Co., Ltd. Solution Business Department, Business Promotion Division 7F AKS Building, 3 Kanda Neribei-cho, Chiyoda-ku, Tokyo Inquiries: Please use the "Inquiry" form on the solution information site.

* The results and examples described in this document are based on specific conditions and do not guarantee similar effects.

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Source: PR TIMES
Category: research

Radi-Cool Radiative Cooling Paint Reduces Air Conditioning Power Consumption by Up to 31.7%

⚡ Key Points

Idemitsu Energy Solutions Co., Ltd. Solution Business Department, Business Promotion Division 7F AKS Building, 3 Kanda Neribei-cho, Chiyoda-ku, Tokyo Inquiries: Please use the "Inquiry" form on the solution information site.

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