Source:JASE-W Japanese Smart Energy Products & Technologies

https://www.jase-w.eccj.or.jp/technologies/index.html

O-43

Keywords

equipment or facility

Y3Z4electricity

E29electrical machinery
AGC Inc.

Low-Contamination High Thermal Energy Reflectance Fluoropolymer Coating(High Solar Reflectance Paint)
Features
Bonnflon Sun Barrier®, high solar reflectance paint developed by AGC Coat-Tech Co., Ltd., a consolidated subsidiary of AGC Inc. Group, is a next-generation energy saving coating that combines infrared
reflective pigment and fluoropolymer paint. Applied on roofs and exterior walls, it efficiently reflects
sunlight and suppress increase in surface temperature, reducing air conditioning lords as well as CO2emissions.
When applied on roofs, rooftop, and exterior walls, it helps lower electricity bills, saves energy, andmitigates the heat-island effect.

Basic Concept or Summary
Bonnflon Sun Barrier® contains a special pigment with high infrared reflectance that reflects infrared
rays from the sun to prevent the heat from causing the increase in room temperature.
Bonnflon Clear, used for the second top coat, has low contamination property and prevents adhesion ofdirt for a long period to prevent decrease in the infrared reflectance of the paint (Fig. 1).
With the double coating technique that applies Bonnflon Clear over Bonnflon Sun Barrier, the paintprevents decrease in the reflectance of the paint applied on exterior walls exposed to harsh weather
conditions and even roofs in the most severe environmental conditions.
Dirt
UV rays Infrared rays
Low-contamination property
Bonnflon Clear

Second top coat

Infrared rays reflecting layer

First top coat
Intermediate coat
Primer coat

Bonnflon Sun Barrier
Base material protection

Infrared rays reflectance pigment

Adhesion to base material
Base material

Double-coating technique

Diagram showing solar heat reflection (animation)
Before treatment(commercially available folded-plate roof: blue) A lot of dirt

After treatment (light gray: E75-80A)

Solar reflectanceSolar radiation absorption rate

Solar reflectanceSolar radiation absorption rate

We conducted a verification test to determine to what extent the difference in solar reflectance between
the rooftop surface treated with Sun Barrier and not treated with Sun Barrier coating would affect thetemperature rise on the surface (Fig. 3). The test has shown that the temperature rise within the test
time was reduced by ~12 °C on the treated surface compared to the untreated surface.

Verification test on the rooftop of a RC condominium
We applied Bonnflon Sun Barrier to the rooftop of a condominium with actual residents to verify thefollowing effects.

Temperature measurement on the rooftop surface treated/not treated with the coating● Applied Bonnflon Sun
Barrier on the rooftop of acondo (RC construction
structure with seven floors)
Color: N-7 Gray

Bonnflon Sun Barrier untreated area

Untreated surface:
increase by 30.0°C
Treated surface:increase by 18.2°C

Minimum surface temperature measured at 6:00 AM

Maximum surface temperature measured at 2:00 PM
Rising temperature difference

UntreatedsurfaceResults

Reductionby ~°C

12

Treatedsurface

Effects or Remarks
The result of the simulation to determine CO2 emission reduction rate shows that, when the solar highreflectance paint is applied on a building roof, it reduces air conditioning and heating loads and canreduce CO2 emissions by up to 21%.
●Result of CO2 emission reduction rate simulation
A/C and heating loads Power consumption(kwh / year)(kwh / year)

Electricity cost(yen / year)

CO2 emission amount(kg / year)

Bonnflon Sun Barrier

31.401

10.467136.073

4.449

General paint39.52813.176171.289

5.600

Reduction amount

8.127

2.709

35.216

1.151

Reduction rate

21%

--21%

Calculation conditions:- the unit price of electricity consumption is 13 yen per 1 kWh, and only the priceof electricity is considered in calculation (excluding basic charge/service fee):*The unit price of electricity varies depending on the condition of how thecustomer receives electricity.
- Power consumption is calculated assuming energy consumption efficiency(COP) as 3.
- CO2 emission amount is 0.425 kg / kwh.
- 1 kwh will be 3.6 megajoules.

*The above numerical values are simulation results and not guaranteed values.

Items■ Roof: stainless steel / plate thickness 3 mm / area 300 m2■ Exterior wall: flexible board / plate thickness 4 mm / area 52 m2 × 4■ Floor: regular concrete / thickness 150 mm / area 300 m2

Conditions

Region / weather conditions Calculated based on the weather data for Tokyo.
The roof surface treated with Bonnflon Sun Barrier and the one
treated with a general paint are compared. The roof is gray (N-4).

Comparisonconditions* The exterior walls are light-colored and painted with a general paint.

Air conditioner
operating conditions

Period of use
Preset temperature* This simulation was calculated using standard weather data and thermal load
calculation program LESCOM (author: Jin Takeda, published by Inoue Shoin).

June - October
26 °C

Usage time

9: 00 - 20: 00

Installation in Practice or Schedule
Domestic

Examples of cases where this technology is applied:Factories and warehouses, residential buildings, commercial and public buildings, gymnasiums.

Contact:

AGC COAT-TECH Co., Ltd., Paint Business Division
Tel: +81-3-5217-5101
http://www.agccoat-tech.co.jp/index.html

O-43