FIELD OF THE INVENTION
The present invention relates to an improved double wall greenhouse device for round the year production of vegetables in high altitude cold and regions.
BACKGROUND OF THE INVENTION
A large country will normally have wide range of climatic conditions which differ from each other in one or the other aspects. In the high altitude cold arid climatic conditions, nothing grows in the open atmosphere during the winter months (October - April). However greenhouse effect is being adapted under such conditions since long to grow various plants/crops by creating controlled environmental conditions by using electricity. In high altitude cold arid regions, production of electricity for example hydropower is not easy. In the winter due to freezing of the most of the water sources, generation of hydropower is obviously difficult. The use of diesel generated electricity is also not economical. As such, a requirement of proposing a greenhouse for round the year production of vegetables economically and abundantly exists which could effectively adapt an alternative source of energy.
A known greenhouse structure called "DOUBLE WALL POLYENCH GREENHOUSE" maintains adequate temperature and moisture for growing of various types of plants. However, such a device is not feasible in the open during the winters. It has been observed during peak winter (up to minus 20°C temperature), that the minimum temperature goes up to + 4 °C in a double wall

polyench greenhouse in comparison to the other greenhouses like the normal trench or the Ladakhi polyhouse, where the minimum temperature reaches up to - 5° C and - 7° C, respectively in high altitude (3450 m AMSL). In the other prior art devices, the minimum temperature reaches up to - 10° C during peak winter (-20%). Thus,in.prior art greenhouses, the successful ultivation of vegetables is possible only when the outside temperature is restricted upto about - 6 ° C. The reason being that, in the prior art greenhouses, the limitations arises due to limited absorption of solar radiation and more heat loss during night. It is difficult to grow vegetables during summer season in other type of greenhouses used in the cold arid regions due to excessive heat.
OBJECTS OF THE PRESENT INVENTION
It is therefore an object of the present invention to propose an improved double-wall greenhouse device for round the year protected cultivation of vegetables in high altitude cold arid climates.
Another object of the present invention is to propose an improved double-wall greenhouse device for round the year protected cultivation of vegetables in high altitude cold arid climates, which in particular promote vegetable cultivation in summer months.
A further object of the present invention is to propose an improved double-wall greenhouse device which provides favorable micro-climate to the plants to develop hybrids of certain vegetables.

A still further object of the present invention is to propose an improved double-wall greenhouse device which efficiently produces certain rare vegetables and flowers for high altitude cold arid climates in particular during the summer months.
An yet another object of the present invention is to propose an improved double-wall greenhouse device which produces round the year vegetables with enhanced productivity and cropping intensity.
A still another object of the present invention is to propose an improved double-wall greenhouse device which develops a low cost greenhouse structure with utilizing locally available material.
SUMMARY OF THE INVENTION
According to the present invention, there is provide an improved double-wall greenhouse device comprising, a trench-like configuration (TLC) having an orientation to receive maximum sunlight during the day-time, the configuration having a depth (d) representing an excavated level (EL) below a ground level (GL); a concrete-based configuration (CBC) erected on said trench-like configuration (TLC), and having a foundation wall (FW), the foundation wall (FW) having a width (W1) and a depth (d1) below the ground level (GL); a plurality of stone masionary walls (SMW) covering an entire periphery of the trench-like configuration (TLC) erected on the foundation wall (FW) originating from the excavated level (EL) to terminate at the ground level (GL), the stone masonary walls (SMW) having a width (W2) and a height (h1); a mud brick masonary double wall (MBDW) having a width (W3) and a height (h2) constructed over the stone masonary wall (SMW) such as to originate from the ground level (GL), the height (h2) of the mud brick masonary double wall (MBDW) being approximately 1.5 metre above

the ground level (GL) in the northern side and zero meter on the southern side, a gap (g) being configured throughout the width (W3) of the wall (MBDW); and a roof (RL) having a plurality of sections (RF1, RF2, RF3) provided on the concrete based configuration (CBC) having a differential slope on atleast two sections (RF1, RF2, RF3) a first section (RF1) comprising a mud material and a second section (RF2, RF3) comprising a fibre reinforced polyster (FRP), the slope on the first section (RF1) being lower than that of the second section (RF2, RF3), a first plurality of ventilators (VL1) being provided on the first section (RF1) and a second plurality of ventilators (VL2) provided in the second section (RF2, RF3)
The double wall polyench greenhouse device, disclosed by Field Research Laboratory, Leh-Ladakh (J & K), absorbs a large quantity of solar radiation and has the capacity to retain the absorbed heat during night due to the device configuration. In this structure, the earth and mud bricks walls absorbs greater heat during the day, which is emitted at night. Air and dry grass between the walls is helpful to retain the heat inside the structure. This creates a favorable micro-climate with in the covered area for obtaining optimum growth of plants in early and late winters (upto - 12° C) and a reasonable growth during peak winters (upto - 20 °C).
The device is totally new and is based on the experiments conducted at the Field Research Laboratory. Leh (ladakh) of Defence Research and Development Organisation. The device provides an efficient round the year production of vegetables including peak winters (upto - 20°C) in high altitudes cold arid climatic conditions.

Due to proposing a new ventilation means, the device is capable of producing vegetables with a 3 - 4 time more yield during the summer season in comparison to open field condition.
Thus, the improved double-wall greenhouse of the invention is configured with the selection of device features capable of providing: -
i) more heat by transmission of maximum solar light within the covered area;
ii) reducing heat loss through cladding material by the provision of 1/3 roof area being covered by mud roof;
iii) retaining maximum heat inside the device by providing a night curtain of black polythene over transparent cladding sheet during night especially during winter season;
iv) removing snow automatically from the cladding surface and roof, by configurating a sloping roof;
v) selecting unbaked mud bricks for construction of side walls of the greenhouse device to reduce heat loss;
vi) providing double walls to retain more heat inside the greenhouse device;
vii) using straw/dry grass for insulation in the gap of the walls;

viii) configurating the base of the device at 1.0 mtr below the ground surface level;
ix) providing innovated ventilation means at the roof and walls to remove the excess heat during summer months;
x) providing doors and irrigation means to the device.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Figure 1 - Shows a front elevational view including sectional views of the greenhouse device according to the present invention.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
The invention is developed and based on a principle which adapts the natural phenomenon of greenhouse effect, insulating property of mud brick walls and emission of absorbed solar heat by soil during the night and absorption of excess heat by the mud bricks during the day time especially in summer months.
As shown in figure -1 , a trench-like configuration (TLC) of size 32 m x 10.5 m, created on a piece of land, the configuration penetrating upto a depth (d) of 1.0 m below the ground level (GL). The orientation of the trench-like configuration (TLC) is selected such that the configuration including any structure erectable thereon will receive sunlight for maximum duration of the day. Longitudinally the

TLC may run East to West. A concrete-based configuration (CBC) is erected on said trench-like configuration (TLC) so as to provide a green-house structure. A width (W1) of a foundation walls (FW) of the concrete-based configuration (CBC) is could be selected around 1.0m and a depth (d1) 0.30m below from bottom level of the TLC.Stone masonary walls (SMW) are constructed on all sides from an excavated level (EL) to the ground level (GL) over the foundation (FW). An width (W2) of the stone masonary wall (SMW) is 0.75 m and a height (h1) is 1.0 m above the foundation. Over the stone masonary wall (SMW), and above the GL, a mud brick, masonary double wall (MBDW) having a width (W3) of 0.30 m including a gap (g) of 15 cm in between, are constructed. The height (h2) of the mud brick wall (MBDW) above GL is 1.5 m in Northern side and zero meter in opposite side (southern side). A roof (RF) is provided with slopes. The roof (RF) consists of three parts (RF1 RF2, RF3) of which two parts (RF2, RF3) are covered with a transparent / translucent polythene or fiber reinforced polyster sheet (FRP) and one part (RF1) with mud covering. The transparent / translucent roof (RF2, RF3) is provided with a slope of 2.5 m ht in 6.0 m length towards Southern Wall (SW). The mud roof (RF1) is provided with a slope of 1.0 m height in 3.75 m length towards Northern sidewall (NW).
Wooden doors of size 2 m height x 1 m width are provided one at each in Eastern side and Western side walls under the mud roof covering (RF1). Atleast six ventilators (VL1) of size 3 ft x 2 ft are provided at a spacing of 5 m distance center to center in the mud roof (RF1) near the highest level. Another four ventilators (VL2) of same size (3 ft x 2 ft) are provided in transparent or translucent cladding material in between at the spacing of 7.5 m distance center to center. A ventilator (VL3) (3 ft x 2 ft) is provided in each wall of the Eastern and Western side at ground level (GL).

WE CLAIM;
1. An improved double-wall greenhouse device comprising:-
- a trench-like configuration (TLC) having an orientation to receive maximum sunlight during the day-time, the configuration having a depth (d) representing an excavated level (EL) below a ground level (GL);
- a concrete-based configuration (CBC) erected on said trench-like configuration (TLC), and having a foundation wall (FW), the foundation wall (FW) having a width (W1) and a depth (d1) below the ground level (GL);
a plurality of stone masionary walls (SMW) covering an entire periphery of the trench-like configuration (TLC) erected on the foundation wall (FW) originating from the excavated level (EL) to terminate at the ground level (GL), the stone masonary walls (SMW) having a width (W2) and a height (h1);
a mud brick masonary double wall (MBDW) having a width (W3) and a height (h2) constructed over the stone masonary wall (SMW) such as to originate from the ground level (GL), the height (h2) of the mud brick masonary double wall (MBDW) being approximately 1.5 metre above the ground level (GL) in the northern side and zero meter on the southern side, a gap (g) being configured throughout the width (W3) of the wall (MBDW); and
a roof (RF) having a plurality of sections (RF1, RF2, RF3) provided on the concrete based configuration (CBC) having a differential slope on atleast two sections (RF1, RF2, RF3) a first section (RF1) comprising a mud material and a second section (RF2, RF3) comprising a fibre reinforced polyster (FRP), the slope on the first section (RF1) being lower than that of the second section (RF2, RF3), a first plurality of ventilators (VL1) being provided on the first section (RF1) and a second plurality of ventilators (VL2) provided in the second section (RF2, RF3)
2. The device as claimed in claim 1, wherein the stone masionary walls (SMW) on the eastern and the western side provided each with a ventilator (VL3) at the ground level (GL).