Development of radiative cooling materials: Phase III. Final technical report. Volume I

Technical Report · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5394210

Research on far infrared (FIR, 8-13 micron) transparent polyethylene glazing and FIR selective emitter films for radiative cooling applications was conducted. Materials performance goals were developed from computer modelled cooling calculations of horizontal radiative cooling panels. Emphasis was placed on determining the minimum glazing properties necessary to allow ''daytime'' cooling. Minimum solar reflectances for polyethylene glazings were calculated to be between 0.60-0.93 depending on other glazing and radiator properties. FIR selective radiators significantly reduced necessary glazing solar reflectance when glazing was also solar absorptive. Glazing films produced were solar transparent, absorptive, or reflective. Approximately 70% solar reflectance was achieved with ZnO pigment while maintaining minimum of 75% FIR transmittance. This glazing would allow cooling if insolation is less than or equal to 800 W/m/sup 2/. ZnS pigmentation produced better solar reflectance but dramatically reduced film FIR transmittance. Neither Ferro Corp's F-6331 black nor fine particle carbon black were found to be good solar absorptive pigments for thin polyethylene films due to high FIR absorption. Poor mechanical properties prohibited development of good selective radiator films from SiO/sub 2/ and Si/sub 3/N/sub 4/ pigmented polyethylene.

• Research Organization: Energy Materials Research Co., Berkeley, CA (USA)
• DOE Contract Number: FC03-80SF11504
• OSTI ID: 5394210
• Report Number(s): DOE/SF/11504-T3-Vol.1; ON: DE85014666
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140901* -- Solar Thermal Utilization-- Space Heating & Cooling
ABSORPTIVITY
C CODES
COMPUTER CODES
COOLING
DESIGN
EQUIPMENT
GLAZING MATERIALS
MATERIALS
MATERIALS TESTING
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PERFORMANCE
PHYSICAL PROPERTIES
POLYETHYLENES
POLYMERS
POLYOLEFINS
RADIATIVE COOLING
RESEARCH PROGRAMS
SOLAR EQUIPMENT
SPECTRAL REFLECTANCE
SPECTRALLY SELECTIVE SURFACES
SURFACES
TESTING