Evacuated tubular solar collector with internal reflector and heatpipe

Conference · Thu Dec 01 04:00:00 EST 1983 · Alternative Energy Sources; (United States)

OSTI ID:6203901

Imani, K; Ikeda, N; Sumida, I

An evacuated tubular solar collector, was developed to provide 130/sup 0/C water for an industrial system. The collector consisted of 6 glass-tubes (100 mm O.D.), the internal silver ion-plated reflector, and copper heatpipes coated by the chrome-black selective absorber. The absorptance and the emittance of the absorber was measured to be 95% and 12%, respectively. The cross-section of reflector was composed of involute curve, straight line and envelope curve. The straight line was used to widen the aperture of reflector, and the envelope curve was designed to focus the 30/sup 0/ incident light on the heatpipe surface. The acceptance angle, concentration ratio and reflectivity was 60/sup 0/, 1.3, and 93%, respectively. The tip of heatpipe, which east side was horizontally 0.7/sup 0/ declined, was bent upwards to accommodate the freezing space to working fluid of 100 cm/sup 3/ water. The west side of heatpipe (22.22 mm O.D.) was connected to the coaxial heat exchanger with the internal fins. The effective colletor area was 1.43 m/sup 2/, while the total installation area was 1.92 m/sup 2/ (2.86m X 0.67m).

• Research Organization: Hitachi Ltd., Hitachi City
• OSTI ID: 6203901
• Report Number(s): CONF-831205-
• Conference Information: Journal Name: Alternative Energy Sources; (United States)
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140905
141000* -- Solar Collectors & Concentrators
BLACK COATINGS
COATINGS
CONCENTRATION RATIO
DESIGN
ENERGY
EQUIPMENT
EVACUATED COLLECTORS
EVACUATED TUBE COLLECTORS
HEAT
HEAT PIPES
HEATING
INDUSTRIAL PLANTS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PROCESS HEAT
REFLECTIVITY
SOLAR COLLECTORS
SOLAR CONCENTRATORS
SOLAR EQUIPMENT
SOLAR HEATING
SOLAR PROCESS HEAT
SOLAR REFLECTORS
SOLAR WATER HEATING
SURFACE PROPERTIES
TUBES
WATER HEATING