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Titolo:
THERMOCHROMIC COMPLEX-COMPOUNDS IN PHASE-CHANGE MATERIALS - POSSIBLE APPLICATION IN AN AGRICULTURAL GREENHOUSE
Autore:
MARINKOVIC M; NIKOLIC R; SAVOVIC J; GADZURIC S; ZSIGRAI I;
Indirizzi:
INST NUCL SCI VINCA,POB 522 YU-11001 BELGRADE YUGOSLAVIA INST NUCL SCI VINCA YU-11001 BELGRADE YUGOSLAVIA UNIV NOVI SAD,FAC SCI YU-21000 NOVI SAD YUGOSLAVIA
Titolo Testata:
Solar energy materials and solar cells
fascicolo: 3-4, volume: 51, anno: 1998,
pagine: 401 - 411
SICI:
0927-0248(1998)51:3-4<401:TCIPM->2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACETAMIDE; SYSTEMS; HEAT;
Keywords:
HEAT STORAGE; PHASE CHANGE MATERIALS; OPTICAL PROPERTIES; THERMOCHROMIC; COBALT (II) COMPLEXES; AGRICULTURAL GREENHOUSE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
15
Recensione:
Indirizzi per estratti:
Citazione:
M. Marinkovic et al., "THERMOCHROMIC COMPLEX-COMPOUNDS IN PHASE-CHANGE MATERIALS - POSSIBLE APPLICATION IN AN AGRICULTURAL GREENHOUSE", Solar energy materials and solar cells, 51(3-4), 1998, pp. 401-411

Abstract

The possibility to combine two physico-chemical phenomena is studied in this work in order to attain simultaneous control of temperature and light intensity in a greenhouse: (a) isothermal heat storage in phase change materials and (b) thermochromic behavior of complex compoundsdissolved in the phase change materials. Two binary mixtures melting near the ambient temperature were studied: (a) 0.925 Ca(NO3)(2) . 4.06H2O + 0.075 CaCl2 . 6.11 H2O melting at 35.6 degrees C and (b) 0.9 CH3CONH2 + 0.1 Ca(NO3)(2) . 4 H2O, melting at 27.7 degrees C. The melting temperature, the enthalpy of fusion and the heat capacity of both mixtures were determined from DSC measurements. Both mixtures showed to be suitable solvents for the formation of consecutive cobalt(II) chloride complexes. The compositions of the complex compounds were adjustedin each mixture so that the absorption spectra in visible spectral range exhibited low absorbance at the melting temperature and a pronounced increase of the absorbance and/or change of color with the increaseof temperature in the range relevant for passive solar energy receivers. The combined latent heat storage and the outstanding reversible change of the optical properties of the dissolved complex compounds withtemperature is proposed to be applied in solar heated agricultural greenhouses in areas with fluctuating climate conditions. The increase of absorbance with temperature acts as an auto-regulated shading protection from overheating. (C) 1998 Elsevier Science B.V. All rights reserved.

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Documento generato il 02/07/20 alle ore 22:38:59