GB1199278A - Improvements in and Relating to Environmental Control Systems - Google Patents

Improvements in and Relating to Environmental Control Systems

Info

Publication number
GB1199278A
GB1199278A GB34369/67A GB3436967A GB1199278A GB 1199278 A GB1199278 A GB 1199278A GB 34369/67 A GB34369/67 A GB 34369/67A GB 3436967 A GB3436967 A GB 3436967A GB 1199278 A GB1199278 A GB 1199278A
Authority
GB
United Kingdom
Prior art keywords
steps
integrated
uniselector
supply
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB34369/67A
Inventor
George Edward Bowman
George Stewart Weaving
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
National Research Development Corp UK
Original Assignee
National Research Development Corp UK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by National Research Development Corp UK filed Critical National Research Development Corp UK
Priority to GB34369/67A priority Critical patent/GB1199278A/en
Publication of GB1199278A publication Critical patent/GB1199278A/en
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
    • A01G9/18—Greenhouses for treating plants with carbon dioxide or the like
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/25—Greenhouse technology, e.g. cooling systems therefor

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Greenhouses (AREA)

Abstract

1,199,278. Treating plants. NATIONAL RESEARCH DEVELOPMENT CORP. 25 Oct., 1968 [26 July, 1967], No. 34369/67. Heading A1E. [Also in Divisions F4 and G1] The temperature and CO 2 concentration of a glasshouse or plant growth room is controlled by integrating signals proportional to photosynthetically-active radiation over set periods of time and selecting the temperature and CO 2 levels for the next period in accordance with the integrated values. The output of a radiation detector is integrated by converting it to p.r.f. modulated pulses which are counted. At the end of a pre-set time, e.g. 10 minutes a uniselector, having the steps of one bank connected to corresponding counter steps, steps round until it reaches the operative contact on the counter. Wipers on other banks of the uniselector select appropriate resistors in the circuits of a heating and ventilating controller and a CO 2 controller. If the ventilator is wide open, the supply of CO 2 is stopped to prevent waste. The system may be overridden manually or by a clock or light lever detector so as to operate only at specific times of day. The radiation signal may also be integrated over 24 hours to control the supply of water.
GB34369/67A 1967-07-26 1967-07-26 Improvements in and Relating to Environmental Control Systems Expired GB1199278A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB34369/67A GB1199278A (en) 1967-07-26 1967-07-26 Improvements in and Relating to Environmental Control Systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB34369/67A GB1199278A (en) 1967-07-26 1967-07-26 Improvements in and Relating to Environmental Control Systems

Publications (1)

Publication Number Publication Date
GB1199278A true GB1199278A (en) 1970-07-22

Family

ID=10364789

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34369/67A Expired GB1199278A (en) 1967-07-26 1967-07-26 Improvements in and Relating to Environmental Control Systems

Country Status (1)

Country Link
GB (1) GB1199278A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0130586A2 (en) * 1983-07-01 1985-01-09 Kei Mori Apparatus for plant culture
US4569150A (en) * 1983-10-31 1986-02-11 Board Of Trustees Operating Michigan State University Method and apparatus for optimization of growth of plants
FR2590672A1 (en) * 1985-11-26 1987-05-29 Agronomique Inst Nat Rech Device for continuously measuring the gas exchanges of plant surfaces in situ

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0130586A2 (en) * 1983-07-01 1985-01-09 Kei Mori Apparatus for plant culture
EP0130586A3 (en) * 1983-07-01 1985-09-25 Kei Mori Apparatus for plant culture
US4569150A (en) * 1983-10-31 1986-02-11 Board Of Trustees Operating Michigan State University Method and apparatus for optimization of growth of plants
FR2590672A1 (en) * 1985-11-26 1987-05-29 Agronomique Inst Nat Rech Device for continuously measuring the gas exchanges of plant surfaces in situ

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees