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Thermochromic complex compounds in phase change materials: possible application in an agricultural greenhouse

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Title: Thermochromic complex compounds in phase change materials: possible application in an agricultural greenhouse
Authors: Gadzuric, S., Nikolic, R., Marinkovic, M., Zsigrai, I., Savovic, J.
Source: Solar Energy Materials & Solar Cells. 2/27/1998, Vol. 51 Issue 3/4, p401. 0p.
Subject Terms: *Greenhouses, *Heat storage, *Solar energy, Technological innovations
Abstract: The possibility to combine two physico-chemical phenomena is studiedin 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 compounds dissolved in the phase change materials. Two binary mixtures melting near the ambient temperature were studied: (a) 0.925 Ca(NO3)2 - 4.06 H2O + 0.075 CaCl2 - 6.11 H2O melting at 35.6 deg.C and (b) 0.9 CH v3CONH2 + 0.1 Ca(NO3)2 - 4 H2O, melting at 27.7 deg.C. The melting temperature, the enthalpy offusion and the heat capacity of both mixtures were determined from DSC measurements. Both mixtures showed to be suitable solvents for theformation of consecutive cobalt(II) chloride complexes. The compositions of the complex compounds were adjusted in 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 increase of 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 with temperature 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. [ABSTRACT FROM AUTHOR]
Copyright of Solar Energy Materials & Solar Cells is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: GreenFILE
An: 8220642
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  Data: Thermochromic complex compounds in phase change materials: possible application in an agricultural greenhouse
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  Data: <searchLink fieldCode="AR" term="%22Gadzuric%2C+S%2E%22">Gadzuric, S.</searchLink><br /><searchLink fieldCode="AR" term="%22Nikolic%2C+R%2E%22">Nikolic, R.</searchLink><br /><searchLink fieldCode="AR" term="%22Marinkovic%2C+M%2E%22">Marinkovic, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Zsigrai%2C+I%2E%22">Zsigrai, I.</searchLink><br /><searchLink fieldCode="AR" term="%22Savovic%2C+J%2E%22">Savovic, J.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Solar+Energy+Materials+%26+Solar+Cells%22">Solar Energy Materials & Solar Cells</searchLink>. 2/27/1998, Vol. 51 Issue 3/4, p401. 0p.
– Name: Subject
  Label: Subject Terms
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  Data: *<searchLink fieldCode="DE" term="%22Greenhouses%22">Greenhouses</searchLink><br />*<searchLink fieldCode="DE" term="%22Heat+storage%22">Heat storage</searchLink><br />*<searchLink fieldCode="DE" term="%22Solar+energy%22">Solar energy</searchLink><br /><searchLink fieldCode="DE" term="%22Technological+innovations%22">Technological innovations</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The possibility to combine two physico-chemical phenomena is studiedin 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 compounds dissolved in the phase change materials. Two binary mixtures melting near the ambient temperature were studied: (a) 0.925 Ca(NO3)2 - 4.06 H2O + 0.075 CaCl2 - 6.11 H2O melting at 35.6 deg.C and (b) 0.9 CH v3CONH2 + 0.1 Ca(NO3)2 - 4 H2O, melting at 27.7 deg.C. The melting temperature, the enthalpy offusion and the heat capacity of both mixtures were determined from DSC measurements. Both mixtures showed to be suitable solvents for theformation of consecutive cobalt(II) chloride complexes. The compositions of the complex compounds were adjusted in 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 increase of 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 with temperature 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. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Solar Energy Materials & Solar Cells is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Code: eng
        Text: English
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        PageCount: 0
        StartPage: 401
    Subjects:
      – SubjectFull: Greenhouses
        Type: general
      – SubjectFull: Heat storage
        Type: general
      – SubjectFull: Solar energy
        Type: general
      – SubjectFull: Technological innovations
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      – TitleFull: Thermochromic complex compounds in phase change materials: possible application in an agricultural greenhouse
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            NameFull: Nikolic, R.
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            NameFull: Marinkovic, M.
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            NameFull: Zsigrai, I.
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            NameFull: Savovic, J.
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            – D: 27
              M: 02
              Text: 2/27/1998
              Type: published
              Y: 1998
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              Value: 51
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              Value: 3/4
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            – TitleFull: Solar Energy Materials & Solar Cells
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