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

  • US 4,108,373 A
  • Filed: 05/14/1975
  • Issued: 08/22/1978
  • Est. Priority Date: 05/22/1974
  • Status: Expired due to Term
First Claim
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1. A method of day and night air-conditioning of an enclosure in which plants are cultivated, at least part of the roofing structure of said enclosure being made up of at least two walls transparent to solar radiation delimiting an intermediate space which is filled with a heat-transporting liquid, wherein:

  • (a) during the daytime, the penetration of the solar energy within said enclosure is selectively limited by making use of an optical filter constituted by said liquid containing an additive for selectively absorbing all radiant energy of wavelengths exceeding a threshold value that lies within the range of 6,000 A to 7,500 A and having no potential usefulness for the productivity and growth of the plants, at the same time permitting the greater part of the solar radiant energy that is ptotentially useful to green plants to be absorbed by the leaves of the plants under cultivation,(b) during the daytime, the heat absorbed is removed by circulating said liquid in a closed circuit and is stored in a reservoir which is separate from the space formed between said walls,(c) during the night, a minimum temperature is maintained within the enclosure by circulating said liquid within said intermediate space,(d) measuring the radiative temperature of the plant cover within the enclosure,(e) 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 minimum permissible limit, and(f) circulating the heat-transporting liquid during the daytime as long as said radiative temperature exceeds said top threshold value and circulating the heat-transporting liquid during the night as long as said radiative temperature is lower than said bottom threshold value.

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