CA1211285A - Geodesic greenhouse operated with a mobile thermal barrier - Google Patents
Geodesic greenhouse operated with a mobile thermal barrierInfo
- Publication number
- CA1211285A CA1211285A CA000475059A CA475059A CA1211285A CA 1211285 A CA1211285 A CA 1211285A CA 000475059 A CA000475059 A CA 000475059A CA 475059 A CA475059 A CA 475059A CA 1211285 A CA1211285 A CA 1211285A
- Authority
- CA
- Canada
- Prior art keywords
- geodesic
- greenhouse
- inner structure
- mobile
- juxtaposed
- 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
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
- A01G9/22—Shades or blinds for greenhouses, or the like
-
- 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
- A01G9/14—Greenhouses
-
- 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
Abstract
Abstract A dome-like geodesic greenhouse includes a geodesic main structure of high diameter-height ratio, with a thermally insulated portion and a translucent portion. A thermally insulated mobile inner geodesic structure gliding on rails and sized so that it can be juxtaposed with the translucent portion of the main structure is used to insulate the growing area from outside environment, when needed. During summer, thermal insulation is replaced by shading panels, and the inner mobile structure is used to control the amount of radiant energy entering the greenhouse. In contrast with related technologies in this field, this system is relatively simple, very robust, flexible and relatively unexpensive. This greenhouse can be operated economically 12 months/years.
Description
~213L~
This invention relates to systems for ~electively controling heat losses photDperiods and te~peratures in a greenhouse.
Increased fuel cost and scarcity of so~e fuels have emphasi~ed the need for energy cDnservatjon in greenhouses. Heat 1~55 is usually decreased by eliminating unnecessary air leaks in the greenhouse roof and side walls, covering the greenhouse with an inflated double layer of pDlyethylene~ or installing opaque screens that are draw between the plants and the translucent surface at night. However, it bec~nes evident that those technigues give poor econo~ical performances when applied in cold-te~perate area~. As a consequence, the agricultural approach of the ~orthern United State and ~anada producers is tD operate si~ple greenhouses for only ~-7 ~onths/years. For these areas, it has been estimated that during cold months~ a total of about 4000 acres of greenhouse floors are left uncultivated; because of the uncumpetitive heating cost that would be involved.
The need for efficient m~bile thermal barriers in qreenhouses i5 ~ell reflected by the density o~ the literature available on this subject. One approach involve the use of flexible sheets o~ insulating material which are deplDyed at night and stored during sunny days by a suitable ~echanical çyste~. Different co~binations of such devices are described in Canadian Patent Nos. 1,003,~41; 1,158,~S4; 1,14S,741 and in U.S. Patent no.
4~0~4,~48. The disadvantage of these systems is the co0plexity of their ~echanical par~s, which maka them susceptible tD fail on long term use~
especially during cold weathar.
~ any çystems have been proposed to cnntrol the temperature and the photoperiod within greenhouses. The commDn practices to control these varia-bles involve the use of an opaque cloth which is pulled over the cultivated areas by a suitable mechanical syste~. In addition to heing expensive and ~o~plex, this method has been associated with heat build-up problen~ under the cloth, during sunny days, Different ~,ystems for contrDlling the photope-riod in greenhDuses are described in Canadian Patent Nos. 942 "426;
17,04~,070; as weel as in U.S. Patent Nns 3,2~4,150; 41062,146 and 4 " 108,373. In additon to their high CDst, these devices are relatively fragile and not strong enough to support efficiently the hard wheater condi-tions of ~inter.
It i5 known that for maxioum transmissiDn of radiant energy, thY ideal architectural for0 for a greenhDuse is the hemispherical dome. The angles in incidence of light and the orientations of the translucent surfaces are optimum at all hours of the day and at all seasons of the year. E~i~tiny henispherical greenhouse are intr3nsically li~ited in size because of the strength limitations of their structural arches and Df their low diameter :
hei~ht ratio (2:1). Thus, although it i5 an ideal for0 in term~ of radi~nt energy transmission, the hemispherical dome is unpractical for large-scale greenhouse production.
Sum~ary of the inyent3on The advantages of geodesic desing, that is predictability, precisiDn and solidity have been applied in the conception of a greenhouse with a high -~2~85 diameter:height ratio labout ~ hat can be operated economically 12 months/year. The main feature of this qreenhouse i5 that the translucent surface area can be adjusted using an inner mobile ther~al barrier providing a partial of a total insulation of the greenhouse atmosphere from outside conditians.
The qreenhouse of the present invention includes:
~ main geodesic structure of a high diameter.height ratio, with a signifi-cant portion covered with a suitable jnsulating material and oriented full North.
~n inner geodesic structure slidin~ ~n a rail system around a central pole, sized so that it can be juxtaposed exactly with remaining translucent por-tion of the s3id main geodesic structure.
cable-pulley system which drive the said inner geodesic structure.
Dne or ~ore triangular panels setis) that can be temporarily (or perm3nen-tly) fixed on the said mobile inner structure. During winter, panels com-posed of an efficient thermal insulating material can be used. Duringsummer, panels composed of a suitable shading material can be installed to redure light intensity or heat flux whenever desired.
The combination of this mobile inner structure ~used either as a thermal barrier or as a shadinq system) with the solid ~ain structure, permits the exploitation of large culture surface areas 12 months~year with relatively low heating and maintenance demands.
Brief des_ipt1on of the dra~ings Fig. I is an exploded view uf the major elements of a greenhouse embodying the teaching of the present inventionu Fig. 2 is a schematic showing some eiements and some of the various pos~ible configurations of the Fig. 1 greenhouse.
Fig. 3 i5 a detail of the emoodiment of Fiq. l and Fig.2 showing a side elevational view of the inner geodesic structure traction unit.
Fig. 4 i5 a detail of the 2mbodiment of Fig. I and Fig. 2 showing d transverse cross section of the rail-cable-pulley system which drives the inner geodesic structure.
Fig. S is a vie~ uf one isoca of the inner geudesic structure of the embodiment of Fig. I and Fig. ~ showing the po~ition~ of the insulating ~or shaùing) panels.
Z0 De_aile_ desc_~ption of _he ~nv_ntion The geodesic structures involved in this inYention have been developed from computer readout generated by programs written by JØ Clindon under a N~SA-sponsored research grant: "~dvanced Structural Desing Concepts for Future Space Missiuns"t Final Report, March 1~70l N~S~ contract NG~ 14-008-002. The datas, principles and ~athematics involved in geodisic desing can be found also in several popular publications on this subject.
In a prefered embodiment, the main structure is made fram five identical four freguency isocas linked together to form a dome-like ~z~ s structure with a high diameter:height ratio. The inner structure i5 ~ade Df three fDur-frequency isDcas. It will be obviDus that different isDcas frequencies can be applied in the ge~desic dQsing without departing fro~
the spirit Df the invention. ModificatiDns of some geodesic chord factors should be perfor0ed to give a planar base to the 6tructure~.
Again~ the details of these modifications a5 well as of the different geodesic structures building techniques can be found in several pDpular publicatiDns.
It ~ill be obvious that different possible combinations in the proporti~n; of the permanently and intermitently insulated parts of the greenhou;e can be applied withDut departing fro~ the spirit Df the inventi~n. The cDnditio~s described hereafter give good econD~ical perfor~ances and are conse~uently cDmprise in ~ Frefered embodi~ent.
~ s seen in figure 1 and 2, the greenhDuse of this embDdi~ent cD~prises a ~ain geodesic structure i supported on a circular foundation 11. T~o isocas ~2/5 of the total surface area) of the ~ain geodesic structure 1 are covered with ~n insulated surface 2 which i5 Driented full North. Three isocas (3/5 of the total surface area) of the ~ain geodesic structure 1 are covered with a translucent ~aterial to fDra the translucent surface 3. ~l5D
shown in figures 1 and 2, is the inner geodesic structure 5 which is ~ade of three isDcas si2ed 5~ that it can be juxtaposed exactly with the translucent surface 3 of the main structure 1. With such a co~bination~ the translucent surface area ~f the greenhou~e roof c3n De adjusted fr~n 0 ta 2/5 ~f the total roof surface are3.
As seen in figures 1, 3 and 4, the geodesic inner structure S i5 resting on a U-shaped circular support ~ on which wheels 8 are fixed at point 7. This unit is gliding around an a~ial pole 4 ~n a circular rail 9 ~hich is supp~rted by a serie of brakets 10 fixed on the foundations 11.
~ 5 best shown in figures 2, ~ and 4, the driving syste~ Df the inner geodesic structure 5 comprises a traction unit 12 pulling a continuous cable 15 mDunted on a serie of pulleys 14 which are fixed on the brakets 10. The continuous cable 15 is Lonnected tD the inner structure 5 by an articulated braket 13 which should be nade of resistant materials. ~5 seen in fi~ure 3, the traction unit 12 and the articulated braket 13 i5 done 50 that the inner geodesic structure 5 have a maxi0um working path.
As it may be seen in figure 3 and 5, the insulating or shading panels are fitted in the triangular frames fDr~ed by the studs lq compDsing the inner geodesic structure 5 and are fixed in place with brakets 21.
Operation o~ th~ greenhouse i5 seen by referring to figure 2~
During cold sunny day~ the inner geDdesic ~tructure 5 equiped with thæ
insulatin3 panels set i5 moved in ~ront of the per~anently in~ulated pDrtion 2 of the main structure 1, all~wing the s~lar radiant energy to penetrate the qreenhDuse. ~s the sun passes over ~rDm East to ~2st -Figures 2-~, 2~ and 2-C-, the said inner structure 5 is displaced 50 that the sDlar energy flux entering the greenhouse is maintained at a maximum value at all hours of the day.
z~s During the night -Figure 2-C-I the said inner stru~ture 5 i5 moved in front of the translucent portion 3 of the main structure 1, which thermally seals the greenhouse atmosphere and decreases drastically the heating d ema n d .
During the su~mer, triangular shading panels are fixed on the inner structure 5 53 that the temperature of the greenhouse environment can be contrDlled ef~iciently with a relatively low ventilation demand.
It has been observed that in the worst condition, -i.e. in the ~iddle of the summer at noon, when the altitude angle of the sun is 0axi~uo-apprDxi~atively 1~4 of the floor surface of the of the greenhouse doe~ not receive direct solar radiant energy. This shaded surface can be decreased significantly by elevating the South face -that i5 the translucent pDrtion 3- of the main structure 1-. During winter, the altitude angle of the sun is relatively low and consequently the shaded floor surface area is mini~um and becomes negligible if the said greenhou~e elev3tion technique i 5 introdu~ed. This shaded area can be used as a working or stDrage space.
The shaded 5urface area in the greenhouse i~ reduced to an insignificant proportion by the use of an inner structure articulated in tWD
~or threel separate panels which are moved and juxtaposed by 3 si~ple ~echanical apparatus. However, it should be noted that this approach increase the ~aintenance demand and complicate the operation of the green house~
B
~ prefered embodiment of the structural 3spects of this invention has been set forth hereinabove. It will be obvious to one of ordinary skill in the art that a number Df different changes and combination6, for e~ample, in the type of insulating or shadin~ or translucent materials, the drive mean of the inner structur2, the diameter-height ratio of the main geodesic structure Dr the elevation angle of the greenhouse cDuld be made without departing from the spirit o~ the invention. Consequently, it should be understood that the pre~ent embodiment is purely illustrative and not restrictive, and that the inventi~n is limited only by the following claims;
This invention relates to systems for ~electively controling heat losses photDperiods and te~peratures in a greenhouse.
Increased fuel cost and scarcity of so~e fuels have emphasi~ed the need for energy cDnservatjon in greenhouses. Heat 1~55 is usually decreased by eliminating unnecessary air leaks in the greenhouse roof and side walls, covering the greenhouse with an inflated double layer of pDlyethylene~ or installing opaque screens that are draw between the plants and the translucent surface at night. However, it bec~nes evident that those technigues give poor econo~ical performances when applied in cold-te~perate area~. As a consequence, the agricultural approach of the ~orthern United State and ~anada producers is tD operate si~ple greenhouses for only ~-7 ~onths/years. For these areas, it has been estimated that during cold months~ a total of about 4000 acres of greenhouse floors are left uncultivated; because of the uncumpetitive heating cost that would be involved.
The need for efficient m~bile thermal barriers in qreenhouses i5 ~ell reflected by the density o~ the literature available on this subject. One approach involve the use of flexible sheets o~ insulating material which are deplDyed at night and stored during sunny days by a suitable ~echanical çyste~. Different co~binations of such devices are described in Canadian Patent Nos. 1,003,~41; 1,158,~S4; 1,14S,741 and in U.S. Patent no.
4~0~4,~48. The disadvantage of these systems is the co0plexity of their ~echanical par~s, which maka them susceptible tD fail on long term use~
especially during cold weathar.
~ any çystems have been proposed to cnntrol the temperature and the photoperiod within greenhouses. The commDn practices to control these varia-bles involve the use of an opaque cloth which is pulled over the cultivated areas by a suitable mechanical syste~. In addition to heing expensive and ~o~plex, this method has been associated with heat build-up problen~ under the cloth, during sunny days, Different ~,ystems for contrDlling the photope-riod in greenhDuses are described in Canadian Patent Nos. 942 "426;
17,04~,070; as weel as in U.S. Patent Nns 3,2~4,150; 41062,146 and 4 " 108,373. In additon to their high CDst, these devices are relatively fragile and not strong enough to support efficiently the hard wheater condi-tions of ~inter.
It i5 known that for maxioum transmissiDn of radiant energy, thY ideal architectural for0 for a greenhDuse is the hemispherical dome. The angles in incidence of light and the orientations of the translucent surfaces are optimum at all hours of the day and at all seasons of the year. E~i~tiny henispherical greenhouse are intr3nsically li~ited in size because of the strength limitations of their structural arches and Df their low diameter :
hei~ht ratio (2:1). Thus, although it i5 an ideal for0 in term~ of radi~nt energy transmission, the hemispherical dome is unpractical for large-scale greenhouse production.
Sum~ary of the inyent3on The advantages of geodesic desing, that is predictability, precisiDn and solidity have been applied in the conception of a greenhouse with a high -~2~85 diameter:height ratio labout ~ hat can be operated economically 12 months/year. The main feature of this qreenhouse i5 that the translucent surface area can be adjusted using an inner mobile ther~al barrier providing a partial of a total insulation of the greenhouse atmosphere from outside conditians.
The qreenhouse of the present invention includes:
~ main geodesic structure of a high diameter.height ratio, with a signifi-cant portion covered with a suitable jnsulating material and oriented full North.
~n inner geodesic structure slidin~ ~n a rail system around a central pole, sized so that it can be juxtaposed exactly with remaining translucent por-tion of the s3id main geodesic structure.
cable-pulley system which drive the said inner geodesic structure.
Dne or ~ore triangular panels setis) that can be temporarily (or perm3nen-tly) fixed on the said mobile inner structure. During winter, panels com-posed of an efficient thermal insulating material can be used. Duringsummer, panels composed of a suitable shading material can be installed to redure light intensity or heat flux whenever desired.
The combination of this mobile inner structure ~used either as a thermal barrier or as a shadinq system) with the solid ~ain structure, permits the exploitation of large culture surface areas 12 months~year with relatively low heating and maintenance demands.
Brief des_ipt1on of the dra~ings Fig. I is an exploded view uf the major elements of a greenhouse embodying the teaching of the present inventionu Fig. 2 is a schematic showing some eiements and some of the various pos~ible configurations of the Fig. 1 greenhouse.
Fig. 3 i5 a detail of the emoodiment of Fiq. l and Fig.2 showing a side elevational view of the inner geodesic structure traction unit.
Fig. 4 i5 a detail of the 2mbodiment of Fig. I and Fig. 2 showing d transverse cross section of the rail-cable-pulley system which drives the inner geodesic structure.
Fig. S is a vie~ uf one isoca of the inner geudesic structure of the embodiment of Fig. I and Fig. ~ showing the po~ition~ of the insulating ~or shaùing) panels.
Z0 De_aile_ desc_~ption of _he ~nv_ntion The geodesic structures involved in this inYention have been developed from computer readout generated by programs written by JØ Clindon under a N~SA-sponsored research grant: "~dvanced Structural Desing Concepts for Future Space Missiuns"t Final Report, March 1~70l N~S~ contract NG~ 14-008-002. The datas, principles and ~athematics involved in geodisic desing can be found also in several popular publications on this subject.
In a prefered embodiment, the main structure is made fram five identical four freguency isocas linked together to form a dome-like ~z~ s structure with a high diameter:height ratio. The inner structure i5 ~ade Df three fDur-frequency isDcas. It will be obviDus that different isDcas frequencies can be applied in the ge~desic dQsing without departing fro~
the spirit Df the invention. ModificatiDns of some geodesic chord factors should be perfor0ed to give a planar base to the 6tructure~.
Again~ the details of these modifications a5 well as of the different geodesic structures building techniques can be found in several pDpular publicatiDns.
It ~ill be obvious that different possible combinations in the proporti~n; of the permanently and intermitently insulated parts of the greenhou;e can be applied withDut departing fro~ the spirit Df the inventi~n. The cDnditio~s described hereafter give good econD~ical perfor~ances and are conse~uently cDmprise in ~ Frefered embodi~ent.
~ s seen in figure 1 and 2, the greenhDuse of this embDdi~ent cD~prises a ~ain geodesic structure i supported on a circular foundation 11. T~o isocas ~2/5 of the total surface area) of the ~ain geodesic structure 1 are covered with ~n insulated surface 2 which i5 Driented full North. Three isocas (3/5 of the total surface area) of the ~ain geodesic structure 1 are covered with a translucent ~aterial to fDra the translucent surface 3. ~l5D
shown in figures 1 and 2, is the inner geodesic structure 5 which is ~ade of three isDcas si2ed 5~ that it can be juxtaposed exactly with the translucent surface 3 of the main structure 1. With such a co~bination~ the translucent surface area ~f the greenhou~e roof c3n De adjusted fr~n 0 ta 2/5 ~f the total roof surface are3.
As seen in figures 1, 3 and 4, the geodesic inner structure S i5 resting on a U-shaped circular support ~ on which wheels 8 are fixed at point 7. This unit is gliding around an a~ial pole 4 ~n a circular rail 9 ~hich is supp~rted by a serie of brakets 10 fixed on the foundations 11.
~ 5 best shown in figures 2, ~ and 4, the driving syste~ Df the inner geodesic structure 5 comprises a traction unit 12 pulling a continuous cable 15 mDunted on a serie of pulleys 14 which are fixed on the brakets 10. The continuous cable 15 is Lonnected tD the inner structure 5 by an articulated braket 13 which should be nade of resistant materials. ~5 seen in fi~ure 3, the traction unit 12 and the articulated braket 13 i5 done 50 that the inner geodesic structure 5 have a maxi0um working path.
As it may be seen in figure 3 and 5, the insulating or shading panels are fitted in the triangular frames fDr~ed by the studs lq compDsing the inner geodesic structure 5 and are fixed in place with brakets 21.
Operation o~ th~ greenhouse i5 seen by referring to figure 2~
During cold sunny day~ the inner geDdesic ~tructure 5 equiped with thæ
insulatin3 panels set i5 moved in ~ront of the per~anently in~ulated pDrtion 2 of the main structure 1, all~wing the s~lar radiant energy to penetrate the qreenhDuse. ~s the sun passes over ~rDm East to ~2st -Figures 2-~, 2~ and 2-C-, the said inner structure 5 is displaced 50 that the sDlar energy flux entering the greenhouse is maintained at a maximum value at all hours of the day.
z~s During the night -Figure 2-C-I the said inner stru~ture 5 i5 moved in front of the translucent portion 3 of the main structure 1, which thermally seals the greenhouse atmosphere and decreases drastically the heating d ema n d .
During the su~mer, triangular shading panels are fixed on the inner structure 5 53 that the temperature of the greenhouse environment can be contrDlled ef~iciently with a relatively low ventilation demand.
It has been observed that in the worst condition, -i.e. in the ~iddle of the summer at noon, when the altitude angle of the sun is 0axi~uo-apprDxi~atively 1~4 of the floor surface of the of the greenhouse doe~ not receive direct solar radiant energy. This shaded surface can be decreased significantly by elevating the South face -that i5 the translucent pDrtion 3- of the main structure 1-. During winter, the altitude angle of the sun is relatively low and consequently the shaded floor surface area is mini~um and becomes negligible if the said greenhou~e elev3tion technique i 5 introdu~ed. This shaded area can be used as a working or stDrage space.
The shaded 5urface area in the greenhouse i~ reduced to an insignificant proportion by the use of an inner structure articulated in tWD
~or threel separate panels which are moved and juxtaposed by 3 si~ple ~echanical apparatus. However, it should be noted that this approach increase the ~aintenance demand and complicate the operation of the green house~
B
~ prefered embodiment of the structural 3spects of this invention has been set forth hereinabove. It will be obvious to one of ordinary skill in the art that a number Df different changes and combination6, for e~ample, in the type of insulating or shadin~ or translucent materials, the drive mean of the inner structur2, the diameter-height ratio of the main geodesic structure Dr the elevation angle of the greenhouse cDuld be made without departing from the spirit o~ the invention. Consequently, it should be understood that the pre~ent embodiment is purely illustrative and not restrictive, and that the inventi~n is limited only by the following claims;
Claims (3)
1) A dome-like geodesic greenhouse comprising;
a) a main geodesic structure of diameter-height ratio higher than 2,5:1 partially covered with an insulating material;
b) a geodesic or arch type inner structure gliding around a central axis on a low friction system and sized so that it can be completely (or partially) juxtaposed with the remaining translucent portion of the said geodesic main structure;
c) a cable-pulley system, or a mechanical system involving a gear-rack or a friction apparatus which drives the said mobile inner structure; and d) panels sets made of different insulating and shading materials that can be temporarily fixed on the said mobile inner structure.
a) a main geodesic structure of diameter-height ratio higher than 2,5:1 partially covered with an insulating material;
b) a geodesic or arch type inner structure gliding around a central axis on a low friction system and sized so that it can be completely (or partially) juxtaposed with the remaining translucent portion of the said geodesic main structure;
c) a cable-pulley system, or a mechanical system involving a gear-rack or a friction apparatus which drives the said mobile inner structure; and d) panels sets made of different insulating and shading materials that can be temporarily fixed on the said mobile inner structure.
2) The geodesic greenhouse defined in claim 1, in which the temporary panels fixed on the mobile inner structure are replaced by a permanent cover of insulating or shading material.
3) The geodesic greenhouses defined in claims 1 or 2, in which the mobile inner structure is composed of articulated parts which can be moved and juxtaposed by a suitable mechanical system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000475059A CA1211285A (en) | 1985-02-25 | 1985-02-25 | Geodesic greenhouse operated with a mobile thermal barrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000475059A CA1211285A (en) | 1985-02-25 | 1985-02-25 | Geodesic greenhouse operated with a mobile thermal barrier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1211285A true CA1211285A (en) | 1986-09-16 |
Family
ID=4129901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000475059A Expired CA1211285A (en) | 1985-02-25 | 1985-02-25 | Geodesic greenhouse operated with a mobile thermal barrier |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1211285A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7770338B2 (en) | 2004-08-10 | 2010-08-10 | Abdessatar Nefzi | Method for producing triangular elements designed for the manufacture of structures and resulting triangular elements |
-
1985
- 1985-02-25 CA CA000475059A patent/CA1211285A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7770338B2 (en) | 2004-08-10 | 2010-08-10 | Abdessatar Nefzi | Method for producing triangular elements designed for the manufacture of structures and resulting triangular elements |
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