Claims:CLAIMS
I claim:-

1. An indoor solar cooking system providing heat energy for cooking entire meal in kitchen itself in comparatively less time means the heat energy is collected from sunlight and is transferred to the cooking load located indoor; wherein the system is divided into two parts, first collecting and concentrating solar energy using lens and transferring it to the mirror system and second mirror system for channeling the direction of the light beam to the cooking platform and the system comprises of collector concentrator, mirrors, lens, collimated beam, opaque shutter, tracking system.

2. The system as claimed in claim 1 is divided into two parts:
a) first collecting and concentrating solar energy using lens and transferring it to the mirror system;
b) Second mirror system for channeling the direction of the light beam to the cooking platform.

3. In the system as claimed in claim 1 the heat is directed with the help of mirror system wherein;
a) Rotatable mirror of adjustable inclination is placed outdoors;
b) Fixed mirror is placed in the kitchen where the cooking is done;
c) It transfers heat from the convex lens to the cooking load.

4. In the system as claimed in claim 1 and 3 all other components are placed at intermediate levels according to the requirements and whenever food has to be cooked, the energy is transferred to the load with the help of mirror system and through a window in the wall and taken indoors

5. The system as claimed in claim 1 comprises of concentrating collectors comprising of receiver, where the sunlight is absorbed, and a concentrator, which is an optical system to concentrate and collimate direct radiation onto receiver/ mirror.
, Description:FORM 2
THE PATENT ACT 1970
(39 OF 1970)
AND
The patent rules, 2003
COMPLETE SPECIFICATION
(See section 10: rule 13)

1. TITLE OF INVENTION
Indoor Solar cooking System

2 APPLICANT
Name Nationality Address
Mrs. Sujata Patrikar Indian Department of applied Physics, Visvesvaraya National Institute of Technology, South Ambazari Road, Nagpur, Maharashtra-440010

3. PREAMBLE TO THE DESCRIPTION

COMPLETE
Following specification particularly describes the invention and the manner in which it is to be performed.

4. DESCRIPTION.

Technical field of invention:
Present invention in general relates to design and implement a solar indoor cooking system for cooking entire Indian meal including chapatti and in particular to design a system using lens system as collector-concentrator and mirror system for channelling the direction of the light beam.

Prior art:
With the era of development and progress, energy has become the key driving force for social development. Current energy shortage has seriously hampered the development and quality of life and improvement in the economy. Sun is a huge, clean, long-term energy body. The use of solar energy and conversion principles of successful development of solar energy cooking equipments, has now become a common but popular living facility.

CN 103462484 A discloses a solar heat exchange rice pot. The invention relates to the fields of pots and solar energy, in particular to a heat exchange pot used for a solar cooker. The solar heat exchange rice pot comprises a cooker, a rice pot body, a steaming plate and a pot cover. The bottom of the cooker is processed into a spiral passage to form a heating plate. The spiral passage is provided with an inlet and an outlet and can allow a heat transfer medium to pass through. The rice pot can be placed into the cooker, and the heat exchange rice pot can be used for cooking. The spiral passage of the heat exchange pot is connected into a solar cooker work system. The solar heat exchange rice pot can be connected with a day lighting mechanism to form a working system loop directly heating food by day lighting. The day lighting mechanism transmits collected sunshine heat to the solar heat exchange rice pot by the aid of the heat transfer medium, and accordingly food can be heated directly. The solar heat exchange rice pot can be connected with a heat exchanger of the solar cooker to form a working system loop utilizing stored spare heat to heat food, and the stored spare heat is enabled to heat food.

Multifunctional solar energy power-generation heat-supply cooking system is disclosed in CN 201758369 U. A first solar energy photovoltaic plate is fixedly connected with two ends of a concave reflective mirror which is connected with the upper end of a bearing bracket and its lower end of the bearing bracket is connected with a bearing on a bottom seat. An input end of an accumulator jar is electrically communicated with the first solar energy photovoltaic plate and its output end is connected with the user. A transmission tracking system comprises a second solar energy photovoltaic plate mounted in the center of the concave reflective mirror and the photovoltaic plate is connected with a clamping plate by a soft connection rod and a control switch is arranged on the clamping plate and one end of the connection rod is fixedly connected with the bearing bracket and another end is connected with an electric machine by the connection rod and an output axle of the electric machine is connected with a transmission wheel and the transmission wheel contacts with a track and an input end of the electric machine is electrically communicated with the control switch on the clamping plate. The solar energy oven is combined with the solar energy photovoltaic plate to generate the power using the solar energy and the solar energy oven is driven by the generated power as the drive force to automatically operate and meanwhile realize the objects of water heating, warming and cooking.

CN 102252430 B describes an indoor oven of solar heat storage device comprising of the lighting mechanism, the heat exchange pot and heat exchangers. It provides a three-way valve, utilizing the heat exchange unit, consisting of a combination of multi-loop system. The system makes use of cotton seed oil heat transfer medium. Screw pumps design work to promote heat transfer medium circulating in the heating food. Design of the temperature control switch to adjust the cooking temperature, heat storage device was designed. The use of calcium chloride hex hydrate does the heat storage medium. Open up the vacuum insulation method, using a vacuum without the physical properties of heat insulation. Lighting mechanism of the system is designed as automatic solar tracking mechanism. Solar cookers, as long as the operating knob three-way valve can be completed. Direct sun can heat the food. When there is no sun the ready to use thermal energy storage backup can be used for heating food.

CN 204165246 U discloses indoor steam type solar cooker. The utility model relates to a solar cooker, in particular to an indoor steam type solar cooker utilizing solar energy to produce steam for cooking. The indoor steam type solar cooker is composed of a solar energy reflection surface, water spraying tank, a hot water tank, a steamer and a connecting pipeline. The solar energy reflection surface is installed outdoor and arranged where sunlight is available. A heat-collection atomizing pipe is installed in the middle of the solar energy reflection surface. The water spraying tank is connected with a spray head water inlet installed in the upper end of the heat-collection atomizing pipe through a water spraying pipe. A small water pump is used for supplying power, and atomized water is sprayed into the heat-collection atomizing pipe so that steam can be produced. The lower end of the heat-collection atomizing pipe is connected with a steam delivery pipe, and the other end of the steam delivery pipe is connected with the hot water tank and the steamer, wherein the hot water tank and the steamer are installed indoors. The indoor steam type solar cooker has the advantages that the day lighting area is large and is generally three square meters or larger; light gathering power is high and can reach up to twenty times; steam production is fast and usually does not exceed one minute; the solar cooker can be used for cooking and water heating; besides, the solar cooker is easy to manufacture and low in cost.

Yet another CN 204115266 U discloses indoor high-temperature heat and energy storage solar furnace circulation system. The problems of high energy consumption of kitchen equipment and difficulty in the effective utilization of solar energy can be effectively solved. According to the technical scheme, a solar concentrator is communicated with a heat storage tank through a first heat conducting circulation pipeline, wherein molten salt is contained in the heat storage tank; a heat storage pipe coil and a heat conducting pipe coil, which are alternately arranged, are arranged in the molten salt respectively; the two ends of the first heat conducting circulation pipeline are connected with the two ends of the heat storage pipe coil respectively; a second heat conducting circulation pipeline extending out of the heat storage tank is arranged at the two ends of the heat conducting pipe coil; a heat conducting oil tank is arranged on the second heat conducting circulation pipeline; a plurality of heat conducting circulation branch pipelines are arranged on the second heat conducting circulation pipeline; a heat locking and preservation body for insulating and preserving heat is arranged outside the heat storage tank. The system is environment-friendly, pollution-free, convenient to use and energy-saving, and has good effects, and solar energy can be effectively converted into heat energy, and the heat energy can be stored and applied to each piece of equipment in a kitchen.

Solar cooker known techniques tap clean and non-polluting and inexhaustible solar energy, but its shortcomings such as first time difference between the light and the meals cannot be solved, not necessarily with a light stoves, time and not necessarily with the kitchen light; the second is solar energy utilization is low, use is limited to cooking time, most of the remaining light time not harvesting; third inconvenient to use, people need to use sunlight open operation; fourth It is a single function, other home heating equipment cannot use their energy.

Disadvantages of other systems-
1] Box type cooker:
• Cooking has to be done outdoor and the cook has to stand in sunlight for a longtime.
• Very slow cooking compared to conventional cooking. This takes 2-3 hours to cook and even more time during cloudy days with respect to less than half an hour taken by conventional methods.
• It is not possible to cook during rainy days.
• There is no control over the rate of cooking.
• This is not an interactive cooking.

2] Panel cooker are:
• Cooking has to be done outdoor and not possible to cook during rainy season.
• Very slow cooking compared to conventional cooking. At least one hour is required to cook during clear sunny day.
• Control over the rate of cooking is not there.

3] Parabolic cooker:
• Cooking has to be carried outdoor. Hence it is not possible to cook during rainy days.
• At the focal point, highly concentrated sun beam fall which is potentially hazardous.
• Parabolic collector requires either one-axis or two-axis tracking system 2 to track the sun.
• Though cooking is as fast compared to conventional cooking, there is no control
over the cooking rate.

4] Schaffer cooker:
• The seasonal variation in the height of the sun requires changing not only the angle between the concentrating reflector and its axis of rotation, but also the shape of the reflector.
• Since focus point is fixed, continuous tracking is necessary.
• Focused sunlight falls only on outer part of the cooking vessel resulting in uneven cooking.
• Highly focused light is very hazardous as cooking is done at the focal point.
• There is no option for either decreasing or increasing the rate of cooking
Therefore there exists a need to overcome the shortcomings of existing technology and provide an efficient solar cooking equipment and apparatus which is capable to transfer the energy of sun to cooking load located indoor. Hence the present invention designs a solar indoor cooking system using((mirror or)) lens to receive solar energy for cooking purpose.

Object:

1. Primary object of the present invention is to design and implement a solar chulha an indoor solar cooking System.

2. Another object of the present invention is to design a cooking system to provide heat energy necessary for the cooking operation.

3. Yet another object of the present invention is to provide an indoor cooking system for cooking entire meal including chapatti.

4. Yet another object of the present invention is to provide a solar indoor cooking system which works even on cloudy days, but cooking time is more on cloudy days.

5. Yet another object of the present invention is to use concentrating collectors in the system required for medium or high temperature.

6. Yet another object of the present invention is to collect solar energy that is directed by the mirror system into the kitchen.

7. Yet another object of the present invention is to collect heat energy from sunlight and transfer it to the cooking load.

8. Yet another object of the present invention is to provide mirror system for channelling the direction of the light beam to the cooking platform.

9. Yet another object of the present invention is to provide a system which can cook in reasonable time.

10. Yet another object of the present invention is to provide a solar chulha which is safe with moderate concentration of radiation.

Other objects, features and advantages will become apparent from detail description and appended claims to those skilled in art.

STATEMENT:
Accordingly following invention provides a design and implementation of a solar indoor cooking system for cooking entire Indian meal including chapatti. The aim of the cooking system is to provide heat energy necessary for the cooking operation. In the proposed system, the heat energy is collected from sunlight and transferred to the cooking load. This can be divided into two parts, first collecting and concentrating solar energy using lens, giving a collimated beam, and transferring it to the mirror system. Second mirror system is employed for channeling the direction of the light beam to the cooking platform. The heat is directed with the help of mirror system. Rotatable mirror of adjustable inclination is placed outdoors. Fixed mirror is placed in the kitchen where the cooking is done. It transfers heat from the convex lens to the cooking load. All other components are placed at intermediate levels according to the requirements. Whenever food has to be cooked, the energy is transferred to the load with the help of mirror system and through a window in the wall and taken indoors. It also reduces the time required for cooking as compared to previously proposed cooking systems. The preferred embodiment mainly comprises of collector concentrator, mirrors, lens, collimated beam, opaque shutter, tracking system, etc.

BRIEF DESCRIPTION OF DRAWING:
This invention is described by way of example with reference to the following drawing where,

Figure 1 of sheet 1 showsconstruction of solar cooker.
Where,
1 denotes Collector and Concentrator
3 denotes Collimated Beam
4 denotes Adjustable Mirror
5 denotes Window in the Wall
6 denotes Fixed Mirror
7 denotes Pot
8 denotes Opaque Shutter.

Figure 2 of sheet 2 shows side view of tracking system.
Where,
1 denotes Collector and Concentrator
2 denotes Tracking System
3 denotes Collimated Beam
4 denotes Adjustable Mirror
8 denotes Opaque Shutter.

Figure 3 of sheet 2 shows the block diagram of solar cooker.
Where,
9 denotes Solar Collector Concentrator
10 denotes Tracking System
11 denotes Mirror System.

In order that the manner in which the above-cited and other advantages and objects of the invention are obtained, a more particular description of the invention briefly described above will be referred, which are illustrated in the appended drawing. Understanding that these drawing depict only typical embodiment of the invention and therefore not to be considered limiting on its scope, the invention will be described with additional specificity and details through the use of the accompanying drawing.

Detailed description:

System Description
Construction of the proposed solar cooking system is shown in figure 1. The solar collector concentrator1 is in general, placed at a little raised position preferably in the open space in rural area and gallery in urban area. Collector concentrator 1 is used to collect solar energy. It consists of a Plano convex lens and a smaller diameter Plano concave lens, both of the same focal length, placed with the curved surface facing each other, at a pre-calculated distance. This gives a collimated beam, and ensures that all the frequencies in the solar spectrum will be utilized. In addition a collimated beam is obtained.

The heat is directed with the help of mirror system 4,6. Rotatable mirror of adjustable inclination 4is placed outdoors. Fixed mirror 6 is placed in the kitchen where the cooking is done. It transfers heat from the convex lens to the cooking load. All other components are placed at intermediate levels according to the requirements. Whenever food has to be cooked, the energy is transferred to the load with the help of mirror system 4,6 and through a window in the wall 5 and taken indoors. It also reduces the time required for cooking as compared to previously proposed cooking systems like box-type cooker.

List of components in the proposed system:
1. Collector and concentrator
2. Tracking system
3. Collimated beam
4. Adjustable mirror
5. Window in the wall
6. Fixed mirror
7. Pot
8. Opaque shutter to cover the collector when not in use

Best method of working of the system:-
If solar energy is absorbed and utilized without using any other external active source is called as passive system. Advantage of flat plate collector is that it can absorb both direct and diffused radiation. Hence it works even on cloudy days. For application such as ours which require medium or high temperature, concentrating collectors are used. A concentrating collector 1 comprises of receiver, where the sunlight is received, and sent to a concentrator, which is an optical system to concentrate and collimate direct radiation onto receiver/ mirror.

The aim of the cooking system is to provide heat energy necessary for the cooking operation. In the proposed system, the main goal is to collect heat energy from sunlight and transfer it to the cooking load. This can be divided into two parts,
• Collecting and concentrating 1 solar energy using lens and transferring it to the mirror system 4, 6.
• Mirror system 4, 6 for channeling the direction of the light beam to the cooking platform

What can you cook in our Solar Chulha:
You can cook a large number of items, which are needed for our daily meals, in a solar cooker. Some of the common items which could be cooked in a solar cooker are listed below:-
We need a system in which in addition to item that can be cooked by existing cookers
1. Tea, coffee can be made.
2. Complete Indian meal can be cooked.
3. Drinking water can be boiled and bathing water can be heated.
4. Indoor cooking is done and chapatti can also be cooked.

An indoor cooking system is designed for cooking entire Indian meal including chapatti. The system gives reasonable cooking time while it is safe with moderate concentration of radiation (unlike the parabolic cooker type of cookers). Cooking time for Indian meal is one hour forty five minute for entire meal for six people (daal, rice, vegetable and chapatti). Additionally, tea, coffee, snacks can also be made. In free time, drinking water can be boiled.

Additional advantages and modification will readily occur to those skilled in art. Therefore, the invention in its broader aspect is not limited to specific details and representative embodiments shown and described herein. Accordingly various modifications may be made without departing from the spirit or scope of the general invention concept as defined by the appended claims and their equivalents.

Adv. Swapnil Gawande (IN/PA/1587)

CLAIMS
I claim:-

1. An indoor solar cooking system providing heat energy for cooking entire meal in kitchen itself in comparatively less time means the heat energy is collected from sunlight and is transferred to the cooking load located indoor; wherein the system is divided into two parts, first collecting and concentrating solar energy using lens and transferring it to the mirror system and second mirror system for channeling the direction of the light beam to the cooking platform and the system comprises of collector concentrator, mirrors, lens, collimated beam, opaque shutter, tracking system.

2. The system as claimed in claim 1 is divided into two parts:
a) first collecting and concentrating solar energy using lens and transferring it to the mirror system;
b) Second mirror system for channeling the direction of the light beam to the cooking platform.

3. In the system as claimed in claim 1 the heat is directed with the help of mirror system wherein;
a) Rotatable mirror of adjustable inclination is placed outdoors;
b) Fixed mirror is placed in the kitchen where the cooking is done;
c) It transfers heat from the convex lens to the cooking load.

4. In the system as claimed in claim 1 and 3 all other components are placed at intermediate levels according to the requirements and whenever food has to be cooked, the energy is transferred to the load with the help of mirror system and through a window in the wall and taken indoors

5. The system as claimed in claim 1 comprises of concentrating collectors comprising of receiver, where the sunlight is absorbed, and a concentrator, which is an optical system to concentrate and collimate direct radiation onto receiver/ mirror.

Adv. Swapnil Gawande (IN/PA/1587)

Mrs. Sujata R Patrikar Sheet 2/1

Figure 1

Adv. Swapnil Gawande (IN/PA/1587)

Mrs. Sujata R Patrikar Sheet 2/2

Figure 2

Figure 3

Adv. Swapnil Gawande (IN/PA/1587)
ABSTRACT

The main goal of the proposed system is to transfer energy from sun to the cooking load that is located in the kitchen. The energy is first collected by the solar collector concentrator lens system which gives a concentrated and collimated beam. The solar energy that is collected is directed by the mirror system into the kitchen, where it is redirected to cooking platform located in the kitchen. The special feature in this system is that a full Indian meal can be made since cooking platform is indoors. This includes chapatti, snacks and hot beverages like tea, coffee. Following invention is described in detail with the help of Figure 1 of sheet 1 showing construction of solar cooker, Figure 2 of sheet 2 showing side view of tracking system and Figure 3 of sheet 2 showing block diagram of solar cooker.