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Method and an installation for the air-conditioning of greenhouses and frames

  • US 4,215,672 A
  • Filed: 12/14/1977
  • Issued: 08/05/1980
  • Est. Priority Date: 12/14/1977
  • Status: Expired due to Term
First Claim
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1. An installation for the plant temperature control by radiant energy in an enclosure in which plants are cultivated, wherein said installation comprises in combination on the one hand an enclosure in which at least part of said enclosure is comprised of at least two walls delimiting at least one intermediate space filled with a heat-transporting liquid, each of the walls and liquid being at least partially transparent to solar radiation, one of the walls being formed of a material which contains an additive which operates to constitute an optical filter which absorbs radiant energy having a wavelength exceeding a threshold value lying within the range of 6000 A to 7500 A and having no usefulness for that growth of plants;

  • and on the other hand a closed circulation system for circulating heat-transporting liquid to which heat absorbed by said one wall has been transferred, said system comprising said intermediate space or spaces, a heat-storage reservoir which is separate from said circulating system, and a pump means which includes means for determining a top threshold value of a radiative temperature which is slightly lower than the maximum permissible limit and a bottom threshold value which is slightly higher than the permissible limit, said pump circulating the heat-transporting liquid during the daytime as long as said radiative temperature exceeds the top threshold value and circulating the heat-transporting liquid during the night as long as the radiative temperature is lower than the bottom threshold value.

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