Title of Invention	"A SOLAR BASED SEMI-UNDERGROUND GREENHOUSE STRUCTURE"
Abstract	This invention relates to an improved semi-underground greenhouse having a wall structure operating based on absorption and emission of solar radiation for production of vegetables in a climate sustaining sub-zero temperature, comprising a trench of atleast 9m length with longitudinal orientation of a front and a wall disposed from east to west, the front wall commencing below the ground level and raised upto the ground level; the rear wall extending upwardly from the ground level, two side walls inclined downwardly from the rear to the front wall, a slanting polysheet forming a cover of said trench, a door provided on the western corner of the rear wall, and atleast two ventilators arranged on the two side walls. The wall structure is configured to establish the following relationships, ratio of the height of the front wall and the rear wall being 0.8 : 1-8, and ratio of the height of the door and the rear wall being 1.2 : 1.8. An exhaust fan operating on solar power and having a sweep of atleast 200 mm is internally disposed on the eastern side wall, and in that; a thickness of the wall structure is construed to be between 0.400 to 0.500 mm.

Title of Invention

"A SOLAR BASED SEMI-UNDERGROUND GREENHOUSE STRUCTURE"

Abstract

This invention relates to an improved semi-underground greenhouse having a wall structure operating based on absorption and emission of solar radiation for production of vegetables in a climate sustaining sub-zero temperature, comprising a trench of atleast 9m length with longitudinal orientation of a front and a wall disposed from east to west, the front wall commencing below the ground level and raised upto the ground level; the rear wall extending upwardly from the ground level, two side walls inclined downwardly from the rear to the front wall, a slanting polysheet forming a cover of said trench, a door provided on the western corner of the rear wall, and atleast two ventilators arranged on the two side walls. The wall structure is configured to establish the following relationships, ratio of the height of the front wall and the rear wall being 0.8 : 1-8, and ratio of the height of the door and the rear wall being 1.2 : 1.8. An exhaust fan operating on solar power and having a sweep of atleast 200 mm is internally disposed on the eastern side wall, and in that; a thickness of the wall structure is construed to be between 0.400 to 0.500 mm.

Full Text	FIELD OF INVENTION The invention relates to a greenhouse structure for efficient production of vegetables during sub-zero tempertures (upto-20O C) BACKGROUND OF INVENTION India has wide range of climatic conditions. which differ from each other in one or the other aspects. In the high altitude, cold arid climatic conditions of I adakh. nothing grows in the open during the winters (Oct-Apr ) . Greenhouse effect is being used since long in many places to grow various plants/crops under controlled environmental conditions by using electricity, in Ladakh production of hydropower is not easy in winters due to freezing of most of the water sources. The use of diesel generated electricity is also not economical. As such, there was a requirement of designing a suitable solar-based—greenhouse for economic production of vegetables, especially during winters in sub—zero temperatures (upto-20°C) . The semi underground greenhouse structure called POL YENCH' maintains adequate temper ature ft moisture for growing of various types of plants, which is NOT feasible in the open, durinq winters. It has been observed that during peak winter, the minimum temperature goes only upto +2O C in polyench in comparison with the other greenhouses like the normal trench, where it reaches upto -2O C to -3O C. in ladakhi uolyhouse it reaches upto about —4O C and in normal polynouses it reaches upto -10O C durinq peak winters (— 20o C). In other types of greenhouses, the successful cultivation of veqetables is possible, only when the outside temperatures i= up to about -6O C, due to limited absorption of solar radiation. However the semi underqround greenhouse. designed by Field Research Laboratory, Leh, absorbs a large quantity of solar radiation due to its design. In this structure, the earth also absorbs greater heat durinq the day, which is emitted at niqht. This creates a favourable micro climate in the structure for obtaining optimum growth of plants in early and late winters (upto -12O C) and reasonable growth during peak winters (upto -20O C). This design is totally new and is based on the experiments conducted at the Field Research Laboratory, Leh of DRDO. There is no such desiqrt available for efficient production of veqetables durinq peak winters (upto -20O C) in liqh altitude cold arid climates. OBJECTS OF THE INVENTION: The main ubiect of the present invention is to propose a greenhouse structure for protected cultivation of veqetables in cold arid climates (upto —20O C) at reasonable cost. Another object of the present invention is to propose a greenhouse structure for veqetable cultivation in summers. Further object of the present design is to propose a greenhouse structure to produce efficiently certain rare vegetables and flowers for high altitude arid climates. DESCRIPTION OF INVENTION According to the present invention, there is provided a solar based semi -umderground greenhouse structure for production of vegetables in sub—zero temperatures, comprising s (a) a trench with longitudinal orientation of the front and rear walls disposed from east to west, (b) a rear wall extending upwardly from the trench, (c) two side walls inclined downwardly from the rear to the front wall, (d) a slanting polysheet forming the cover of said trench, (e) and a sma11 door . The present invention will now be illustrated with the following example, which is intended to be a typical of rather than in any way limiting on the scope of the present invention. Further objects and advantages of this invention will be more apparent from the ensuing description when read in conjunction with the accompanying drawing and wherein Fiq.1 shows the structure of the present invention. The solar based semi—under ground greenhouse 1 for vegetable production in sub-zero temperatures has a construction takinq into consideration the natural phenomenon of greenhouse effect, insulating property of mud brick walls and emission of absorbed solar' heat by soil heneath during night. It comprises a trench 2, for example, 9 m x 3 m in plan and dug to a depth of for example 0.8 m. The trench comprises a front wall 3 disposed below the ground level GL, a rear wall 4 extending upwardly from the ground level GL „ and side walls 5 inclined downwardly from rear wall 4 to front wall 3. The orientation is such that longitudinally it runs east to west, A stone masonary wall is erected on the the rear wall 4 from excavated level to the ground level (GL) over foundation. Over this wall, above EL, mud brick masonary wall is erected upto a height of for example 1 m. Similarly, front wall 3 is raised from the excavated level to the GL in stone masonary. Rear wall (higher wall) is raised on northern side and shorter wall on southern side. Similarly, side walls 5 are also erected. The top of the side wall slopes from top of rear wall to the top of front wall supports 6 such as GL pipes or wooden ballies are laid in slopes supported on top of front and rear walls. These GI pipes/ballies work as support for polysheet 7 which rests in slope over this trench. A wooden door such as 1.2 m hiqlt x. 0.8 in wide is provided on western corner of rear wall. Two ventilators (380 mm x 200 mm) are provided on two side walls. An exhaust fan working on solar energy, is provided on eastern side wall. A pipe (GI/PVC/Rubber). is provided on ground through any one wall for irriqation of this structure. It is to be understood that the above description of the design of the structure is susceptible to considerable modifications, change and adaptations by those skilled in the art. Such modifications are intended to be considered within the scope of the present invention which is set forth by the following claims:— WE CLAIM: 1 . A solar based semi-underground greenhouse structure for production of vegetables in sub—zero, temperatures, comprising s — (a) a trench with longitudinal orientation of the front and rear walls disposed from east to west, (b) a real wall extending upwardly from the trench, (c) two side walls inclined downwardly from the rear- to the front wall, (d) a slanting polysheet forming the cover of said trench. (e) and a small door. 2. A structure as claimed in claim 1, wherein said cover is a polysheet. 3. A structure as claimed in claim 1 comprising a plurality of spaced supports for supporting said sheet. 4. A structure as claimed in claim 1 comprising a door provided on the western corner of the rear wall. 5. A structure as claimed in claim 1 comprising ventilators provided on two side walls. 6. A structure as claimed in claim 1 comprdsing an irrigation inlet provided in any of the walls. 7. A solar based semi underground greenhouse structure substantially as herein described and i1lustrated.

Full Text

FIELD OF INVENTION
The invention relates to a greenhouse structure for
efficient production of vegetables during sub-zero
tempertures (upto-20O C)
BACKGROUND OF INVENTION
India has wide range of climatic conditions. which differ from each other in one or the other aspects. In the high altitude, cold arid climatic conditions of I adakh. nothing grows in the open during the winters (Oct-Apr ) .
Greenhouse effect is being used since long in many places to grow various plants/crops under controlled environmental conditions by using electricity, in Ladakh production of hydropower is not easy in winters due to freezing of most of the water sources. The use of diesel generated electricity is also not economical. As such, there was a requirement of designing a suitable solar-based—greenhouse for economic production of vegetables, especially during winters in sub—zero temperatures (upto-20°C) .
The semi underground greenhouse structure called POL YENCH' maintains adequate temper ature ft moisture for
growing of various types of plants, which is NOT feasible in the open, durinq winters. It has been
observed that during peak winter, the minimum
temperature goes only upto +2O C in polyench in
comparison with the other greenhouses like the normal
trench, where it reaches upto -2O C to -3O C. in ladakhi
uolyhouse it reaches upto about —4O C and in normal

polynouses it reaches upto -10O C durinq peak winters (—

20o C). In other types of greenhouses, the successful
cultivation of veqetables is possible, only when the
outside temperatures i= up to about -6O C, due to limited
absorption of solar radiation. However the semi underqround greenhouse. designed by Field Research Laboratory, Leh, absorbs a large quantity of solar radiation due to its design. In this structure, the earth also absorbs greater heat durinq the day, which is emitted at niqht. This creates a favourable micro climate in the structure for obtaining optimum growth of
plants in early and late winters (upto -12O C) and
reasonable growth during peak winters (upto -20O C).
This design is totally new and is based on the experiments conducted at the Field Research Laboratory, Leh of DRDO. There is no such desiqrt available for
efficient production of veqetables durinq peak winters
(upto -20O C) in liqh altitude cold arid climates.
OBJECTS OF THE INVENTION:
The main ubiect of the present invention is to propose a
greenhouse structure for protected cultivation of
veqetables in cold arid climates (upto —20O C) at
reasonable cost.
Another object of the present invention is to propose a greenhouse structure for veqetable cultivation in
summers.

Further object of the present design is to propose a greenhouse structure to produce efficiently certain rare vegetables and flowers for high altitude arid climates.
DESCRIPTION OF INVENTION
According to the present invention, there is provided a solar based semi -umderground greenhouse structure for production of vegetables in sub—zero temperatures, comprising s
(a) a trench with longitudinal orientation of the front and rear walls disposed from east to west,
(b) a rear wall extending upwardly from the trench,
(c) two side walls inclined downwardly from the rear to the front wall,
(d) a slanting polysheet forming the cover of said trench,
(e) and a sma11 door .
The present invention will now be illustrated with the following example, which is intended to be a typical of
rather than in any way limiting on the scope of the present invention.
Further objects and advantages of this invention will be more apparent from the ensuing description when read in conjunction with the accompanying drawing and wherein
Fiq.1 shows the structure of the present invention.
The solar based semi—under ground greenhouse 1 for vegetable production in sub-zero temperatures has a construction takinq into consideration the natural phenomenon of greenhouse effect, insulating property of mud brick walls and emission of absorbed solar' heat by soil heneath during night. It comprises a trench 2, for example, 9 m x 3 m in plan and dug to a depth of for example 0.8 m. The trench comprises a front wall 3 disposed below the ground level GL, a rear wall 4 extending upwardly from the ground level GL „ and side walls 5 inclined downwardly from rear wall 4 to front wall 3. The orientation is such that longitudinally it runs east to west, A stone masonary wall is erected on the the rear wall 4 from excavated level to the ground level (GL) over foundation. Over this wall, above EL, mud brick masonary wall is erected upto a height of for example 1 m. Similarly, front wall 3 is raised from the excavated level to the GL in stone masonary. Rear wall (higher wall) is raised on northern side and shorter wall on southern side. Similarly, side walls 5 are also erected.
The top of the side wall slopes from top of rear wall to the top of front wall supports 6 such as GL pipes or
wooden ballies are laid in slopes supported on top of front and rear walls. These GI pipes/ballies work as
support for polysheet 7 which rests in slope over this trench.
A wooden door such as 1.2 m hiqlt x. 0.8 in wide is provided on western corner of rear wall. Two ventilators (380 mm x 200 mm) are provided on two side walls. An exhaust fan working on solar energy, is provided on
eastern side wall. A pipe (GI/PVC/Rubber). is provided on ground through any one wall for irriqation of this structure.
It is to be understood that the above description of the design of the structure is susceptible to considerable modifications, change and adaptations by those skilled in the art. Such modifications are intended to be considered within the scope of the present invention which is set forth by the following claims:—

WE CLAIM:
1 . A solar based semi-underground greenhouse structure for production of vegetables in sub—zero, temperatures, comprising s —
(a) a trench with longitudinal orientation of the
front and rear walls disposed from east to west,
(b) a real wall extending upwardly from the trench,
(c) two side walls inclined downwardly from the rear-
to the front wall,
(d) a slanting polysheet forming the cover of said trench.
(e) and a small door.
2. A structure as claimed in claim 1, wherein said
cover is a polysheet.
3. A structure as claimed in claim 1 comprising a
plurality of spaced supports for supporting said sheet.
4. A structure as claimed in claim 1 comprising a
door provided on the western corner of the rear wall.
5. A structure as claimed in claim 1 comprising ventilators provided on two side walls.
6. A structure as claimed in claim 1 comprdsing an irrigation inlet provided in any of the walls.
7. A solar based semi underground greenhouse structure substantially as herein described and i1lustrated.

Documents:

614-del-2001-abstract.pdf

614-del-2001-claims.pdf

614-del-2001-correspondence-others.pdf

614-del-2001-correspondence-po.pdf

614-del-2001-description (complete).pdf

614-del-2001-drawings.pdf

614-del-2001-form-1.pdf

614-del-2001-form-13.pdf

614-del-2001-form-18.pdf

614-del-2001-form-2.pdf

614-del-2001-form-26.pdf

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Patent Number

220098

Indian Patent Application Number

614/DEL/2001

PG Journal Number

28/2008

Publication Date

11-Jul-2008

Grant Date

15-May-2008

Date of Filing

28-May-2001

Name of Patentee

CHIEF CONTROLLER, DEFENCE RESEARCH & DEVELOPMENT ORGANISATION, MINISTRY OF DEFENCE

Applicant Address

Inventors:

#	Inventor's Name	Inventor's Address
1	BRAHMA SINGH
2	DHARM PAUL ATTREY
3	NARENDRA SINGH

PCT International Classification Number

C02F 1/14

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA