Details
| Original language | English |
|---|---|
| Pages (from-to) | 677-686 |
| Number of pages | 10 |
| Journal | High Temperatures - High Pressures |
| Volume | 32 |
| Issue number | 6 |
| Publication status | Published - 2000 |
| Event | 15th European Conference on Thermophysical Properties - Würzburg, Würzburg, Germany Duration: 5 Sept 1999 → 9 Sept 1999 Conference number: 15 |
Abstract
The basic equations for calculating radiation entropy and the major input functions to these equations, namely the spectral and directional distribution of radiation intensity and its degree of polarisation, are presented. Thermodynamic evaluation of energy conversion processes by means of the balance equations requires all involved energy and entropy fluxes to be known. The incoming radiation energy and entropy can be obtained from atmospheric models, but the properties of the outgoing radiation strongly depend on the optical properties of the surface. As the required optical properties usually are not available over the entire spectral range and for all directions, measurements are performed in order to improve the accuracy of the energy and entropy balances. An apparatus is presented, capable of measuring the spectral directional emittance and the degree of polarisation of the emitted radiation in the range of infrared wavelengths.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: High Temperatures - High Pressures, Vol. 32, No. 6, 2000, p. 677-686.
Research output: Contribution to journal › Conference article › Research › peer review
}
TY - JOUR
T1 - Measurement of emittance and degree of polarisation of surfaces for solar energy converters
AU - Labuhn, Dirk
AU - Kabelac, Stephan
N1 - Conference code: 15
PY - 2000
Y1 - 2000
N2 - The basic equations for calculating radiation entropy and the major input functions to these equations, namely the spectral and directional distribution of radiation intensity and its degree of polarisation, are presented. Thermodynamic evaluation of energy conversion processes by means of the balance equations requires all involved energy and entropy fluxes to be known. The incoming radiation energy and entropy can be obtained from atmospheric models, but the properties of the outgoing radiation strongly depend on the optical properties of the surface. As the required optical properties usually are not available over the entire spectral range and for all directions, measurements are performed in order to improve the accuracy of the energy and entropy balances. An apparatus is presented, capable of measuring the spectral directional emittance and the degree of polarisation of the emitted radiation in the range of infrared wavelengths.
AB - The basic equations for calculating radiation entropy and the major input functions to these equations, namely the spectral and directional distribution of radiation intensity and its degree of polarisation, are presented. Thermodynamic evaluation of energy conversion processes by means of the balance equations requires all involved energy and entropy fluxes to be known. The incoming radiation energy and entropy can be obtained from atmospheric models, but the properties of the outgoing radiation strongly depend on the optical properties of the surface. As the required optical properties usually are not available over the entire spectral range and for all directions, measurements are performed in order to improve the accuracy of the energy and entropy balances. An apparatus is presented, capable of measuring the spectral directional emittance and the degree of polarisation of the emitted radiation in the range of infrared wavelengths.
UR - http://www.scopus.com/inward/record.url?scp=0034347868&partnerID=8YFLogxK
U2 - 10.1068/htwu196
DO - 10.1068/htwu196
M3 - Conference article
AN - SCOPUS:0034347868
VL - 32
SP - 677
EP - 686
JO - High Temperatures - High Pressures
JF - High Temperatures - High Pressures
SN - 0018-1544
IS - 6
T2 - 15th European Conference on Thermophysical Properties
Y2 - 5 September 1999 through 9 September 1999
ER -