Theoretical calculation of the thermal efficiency of an evacuated tubular collector
Journal Article
·
· Heat Transfer - Jpn. Res.; (United States)
OSTI ID:6562554
A formula to calculate the instantaneous efficiency of an evacuated tubular collector which has flat absorber plates in glass tubes and a white plate with diffuse reflection beneath tubes is derived, considering the dependency of the effective transmission-absorption factor (tau..cap alpha..)/sub e/ on the direction of incident solar radiation. The curve of efficiency characteristics by the theoretical calculation and that by experimental measurements have almost the same slope and the validity of the theoretical formula on heat losses from the collector is proved. The calculated efficiency eta/sub th/ and the measured efficiency eta/sub m/ show almost the same effect by the change of direction of incident solar radiation, so that dependency of the theoretically calculated (tau..cap alpha..)/sub e/ on the direction of incident radiation is similar to that of a real collector.
- Research Organization:
- Government Industrial Research Institute, Nagoya
- OSTI ID:
- 6562554
- Journal Information:
- Heat Transfer - Jpn. Res.; (United States), Journal Name: Heat Transfer - Jpn. Res.; (United States) Vol. 15:3; ISSN HTJPA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Transmittance-absorptance product for concentric tubular collector elements, developed for the three-dimensional case
Calculating solar radiation received by tubular solar energy collectors
Off-normal experimental verification of numerically calculated incidence angle modifiers for evacuated tube integral storage solar collectors
Conference
·
Mon Dec 31 23:00:00 EST 1979
· Proc. Annu. Meet. - Am. Sect. Int. Sol. Energy Soc.; (United States)
·
OSTI ID:6547929
Calculating solar radiation received by tubular solar energy collectors
Conference
·
Tue Oct 31 23:00:00 EST 1995
·
OSTI ID:113342
Off-normal experimental verification of numerically calculated incidence angle modifiers for evacuated tube integral storage solar collectors
Conference
·
Tue Oct 31 23:00:00 EST 1995
·
OSTI ID:116244
Related Subjects
14 SOLAR ENERGY
141000* -- Solar Collectors & Concentrators
CALCULATION METHODS
DIFFUSION
EFFICIENCY
ENERGY LOSSES
ENERGY TRANSFER
EQUIPMENT
EVACUATED COLLECTORS
EVACUATED TUBE COLLECTORS
HEAT LOSSES
HEAT TRANSFER
LOSSES
ORIENTATION
PLATES
RADIATIONS
SOLAR ABSORBERS
SOLAR COLLECTORS
SOLAR EQUIPMENT
SOLAR RADIATION
STELLAR RADIATION
THERMAL DIFFUSION
THERMAL EFFICIENCY
141000* -- Solar Collectors & Concentrators
CALCULATION METHODS
DIFFUSION
EFFICIENCY
ENERGY LOSSES
ENERGY TRANSFER
EQUIPMENT
EVACUATED COLLECTORS
EVACUATED TUBE COLLECTORS
HEAT LOSSES
HEAT TRANSFER
LOSSES
ORIENTATION
PLATES
RADIATIONS
SOLAR ABSORBERS
SOLAR COLLECTORS
SOLAR EQUIPMENT
SOLAR RADIATION
STELLAR RADIATION
THERMAL DIFFUSION
THERMAL EFFICIENCY