solar air conditioner - information and library...

1

SOLAR AIR CONDITIONER

B.S.P.P. 2014-15

PROJECT REPORT

ON


PROJECT GROUP :

PATEL BHAVIK 126440319002

DOSHI HARSHIT 126440319003

PANCHAL UJAVAL 126440319005

PATEL HIMANSHU 126440319008

PATEL JINAL 126440319015

CHANDARANA BHAVIN 126440319051

INTERNAL GUIDE : MR. S.V.PATEL __________________

HEAD OF DEPARTMENT : MR. K.P.PATEL __________________

2


B.S.P.P. 2014-15

CERTIFICATE

This is to certify that Mr. BHAVIK PATEL having Enrollment No: 126440319002 has

completed part-I UDP project work having title SOLAR AIR CONDITIONER.

He has undergone the process of shodh yatra, literature survey and problem definition. He

is supposed to carry out the residue UDP part-work on same problem during semester-IV for the

final fulfillment of the UDP work which is prerequisite to complete Diploma Engineering.

Guide: Mr. S.V.PATEL H.O.D: Mr. K.P.PATEL

3


B.S.P.P. 2014-15

CERTIFICATE

This is to certify that Mr. HARSHIT DOSHI having Enrollment No: 126440319003 has






4


B.S.P.P. 2014-15

CERTIFICATE

This is to certify that Mr. UJAVAL PANCHAL having Enrollment No: 126440319005 has






5


B.S.P.P. 2014-15

CERTIFICATE

This is to certify that Mr. HIMANSHU PATEL having Enrollment No: 126440319008 has






6


B.S.P.P. 2014-15

CERTIFICATE

This is to certify that Mr. JINAL PATEL having Enrollment No: 126440319015 has






7


B.S.P.P. 2014-15

CERTIFICATE

This is to certify that Mr. BHAVIN CHANDARANA having Enrollment No: 126440319051

has completed part-I UDP project work having title SOLAR AIR CONDITIONER.





8


B.S.P.P. 2014-15

USER DEFINED PROJECT (UDP) STATEMENT FORM

STUDENT PARTICULARS-1

FIRST NAME BHAVIK

LAST NAME PATEL

MOBILE NO. +91 9714 203 690

EMAIL [email protected]

COLLEGE

NAME B.S.PATEL POLYTECNIC, GANPAT UNIVERSITY.

ADDRESS

AT. & P. : GHADIA

TA. : KAPADAVANJ

DIST. : KHEDA

BRANCH MECHANICAL ENGINEERING

SEMESTER 5th SEM. YEAR 2014-2015

TEAM NAME GROUP - 8

SIGNATURE

OF STUDENT

mailto:[email protected]

9


B.S.P.P. 2014-15



FIRST NAME HARSHIT

LAST NAME DOSHI

MOBILE NO. +91 9898 943 407


COLLEGE


ADDRESS

19/C HARIPARK SOCIETY

ANKUR ROAD

AHMEDABAD



TEAM NAME GROUP – 8

SIGNATURE

OF STUDENT

10


B.S.P.P. 2014-15



FIRST NAME UJAVAL

LAST NAME PANCHAL

MOBILE NO. +91 9979 003 583


COLLEGE


ADDRESS

D4/NEW SOMNATH FLAT

NR. : HARSHAD COLONY

BAPUNAGAR, AHMEDABAD



TEAM NAME GROUP - 8

SIGNATURE

OF STUDENT

11


B.S.P.P. 2014-15



FIRST NAME HIMANSHU

LAST NAME PATEL

MOBILE NO. +91 9638 569 593


COLLEGE


ADDRESS

14,NEW SHAKTI FLAT

SHAKTI NAGAR SOCIETY, BECHARPURA

PALANPUR




SIGNATURE

OF STUDENT

12


B.S.P.P. 2014-15



FIRST NAME JINAL

LAST NAME PATEL

MOBILE NO. +91 9408 033 780


COLLEGE


ADDRESS

JKV NAGAR-1

JAMNAGAR-DWARKA HIGHWAY

OPP. : PARISHRAM HOTEL, JAM-KHAMBHALIA




SIGNATURE

OF STUDENT

13


B.S.P.P. 2014-15



FIRST NAME BHAVIN

LAST NAME CHANDARANA

MOBILE NO. +91 9638 932 936


COLLEGE


ADDRESS

72/AMBIKA NAGAR SOCIETY

JIN ROAD

PATDI



TEAM NAME GROUP - 8

SIGNATURE

OF STUDENT

14


B.S.P.P. 2014-15

ACKNOWLEDGEMENT

We are thankful to our project guide Mr. S.V.PATEL whose guidance and consistent

encouragement made this project possible. We are grateful to Mr. K.P.PATEL, the head of

mechanical engineering department for the encouragement and support. We especially thankful

to all the faculty members of mechanical department of B.S.PATEL POLITECHNIC, GANPAT

UNIVERSITY from whom we gained the precious knowledge, which helped us lot in preparing our

project work. We take opportunity to thank all of those who have helped me directly or indirectly

in completion of our project work. We are indebted to our family members for their moral support.

We are also thankful to our friends, my group and well-wishers. For their constant support which

helped us in successful completion of the project work.

15


B.S.P.P. 2014-15

ABSTRACT

Air-conditioning is one of the major consumers of electrical energy in many parts of the

world today and already today air-conditioning causes energy shortage in for example China.

The demand can be expected to increase because of changing working times, increased

comfort expectations and global warming. Air-conditioning systems in use are most often built

around a vapor compression systems driven by grid-electricity. However, most ways of generating

the electricity today, as well as the refrigerants being used in traditional vapor compression

systems, have negative impact on the environment.

Solar air-conditioning might be a way to reduce the demand for electricity. In addition many

solar air-conditioning systems are constructed in ways that eliminate the need for CFC, HCFC or

HFC refrigerants.

An aim of the report is to describe and explain the working principles of the

components and subsystem in such general terms that the report is usable not only to those

specifically interested in solar air conditioning, but to anyone interested in air conditioning, heat

driven air-conditioning and solar energy.

The last section of the report briefly deals with how the components can be combined to

form a complete solar air-conditioning system.

16


B.S.P.P. 2014-15

INDEX

SR.

NO.

TOPICS NAME PAGE NO.

1. Introduction 17

2. What is project ? 22

3. Description of project 26

4. Parts of solar system 28

5. Air conditioner 33

6. Calculation 41

7. Advantages 49

8. Disadvantages 50

9. Cost estimation of project 51

10. conclusion 52

11. References 53

17


B.S.P.P. 2014-15

INTRODUCTION

Energy is the primary and most universal measure of all kinds of work by human beings and

nature. Energy is a crucial input in the process of economic, social and industrial development.

Day by day the energy consumption is increasing very rapidly. The rate of energy

consumption is increasing. Supply is depleting resulting in inflation and energy shortage. This is

called the energy crisis.

According to law of conservation of energy ''energy can neither be created nor be destroyed

but can be transformed from one form to another form. Energy can be transported from one place

to another place.''

Alternative or non-conventional or renewable energy resources are very essential to develop

for future energy requirements.

The energy demand increases day by day because of population increasing industrialization

increases and transportation increases etc.

Sources of energy

There are two main sources of energy. They are conventional and non-conventional sources

of energy.

Conventional sources of energy:-

Conventional energy sources are wood, flowing water and fossil fuels (coal, petroleum,

natural gas).the conventional sources of energy are generally non-renewable sources of energy,

which are being used since a long time.

At the same time it is becoming increasingly difficult to discover and exploit their new

deposits. It is envisaged at known deposits of petroleum in our country will get exhausted by the

few decades and coal reserves are expected to last for another hundred years. The coal,

petroleum, natural gas and electricity are conventional sources of energy.

18


B.S.P.P. 2014-15

Non-conventional sources of energy:-

Non-conventional energy sources are solar energy, wind energy, biomass energy, ocean

energy (tidal energy, wave energy, and ocean thermal energy), geothermal energy, nuclear

energy etc. in future non-conventional energy sources are the best source of energy.

Energy generated by using wind, tides, solar, geothermal heat, and biomass including farm

and animal waste as well as human excreta is known as non-conventional energy. All these

sources are renewable or inexhaustible and do not cause environmental pollution.

1. Wind Energy:-

Wind power is harnessed by setting up a windmill which is used for pumping water, grinding

grain and generating electricity. The gross wind power potential of India is estimated to be about

20,000 MW, wind power projects of 970 MW capacities were installed till March. 1998. Areas with

constantly high speed preferably above 20 km per hour are well-suited for harnessing wind

energy.

2. Tidal Energy:-

Sea water keeps on rising and falling alternatively twice a day under the influence of

gravitational pull of moon and sun. This phenomenon is known as tides. It is estimated that India

possesses 8000-9000 MW of tidal energy potential. The Gulf of Kuchchh is best suited for tidal

energy.

3. Solar Energy:-

Sun is the source of all energy on the earth. It is most abundant, inexhaustible and

universal source of energy. AH other sources of energy draw their strength from the sun. India is

blessed with plenty of solar energy because most parts of the country receive bright sunshine

throughout the year except a brief monsoon period. India has developed technology to use solar

energy for cooking, water heating, water dissimilation, space heating, crop drying etc.

19


B.S.P.P. 2014-15

4. Geo-Thermal Energy:-

Geo-thermal energy is the heat of the earth's interior. This energy is manifested in the hot

springs. India is not very rich in this source.

5. Energy from Biomass:-

Biomass refers to all plant material and animal excreta when considered as an energy

source. Some important kinds of biomass are inferior wood, urban waste, bagasse, farm animal

and human waste.

Importance of non-conventional sources of energy:-

1. The non-conventional sources of energy are abundant in nature. According to energy experts

the non-conventional energy potential of India is estimated at about 95,000 MW.

2. These are renewable resources. The non-conventional sources of energy can be renewed with

minimum effort and money.

3. Non-conventional sources of energy are pollution-free and eco-friendly.

SOLAR ENERGY

The sun is the most prominent feature in our solar system. The sun's great energy release

is the result of an elaborate chemical process in the sun's core-a process of thermonuclear fusion.

This energy is radiated from sun in all directions and a very small fraction of it reaches to the

earth.

The sun's outer visible layer is called the photosphere and has a temperature of about

6000degree.

20


B.S.P.P. 2014-15

Sun statics:-

The Sun is a rather commonplace celestial object. It is a star of ordinary dimensions and of

ordinary brightness. But to observers on the Earth, the Sun remains an object of magnificent

proportions. This fiery ball of superheated hydrogen and helium gases contains 99.9 per central

matter in the Solar System, and a million Earths could fit inside the Sun, with room to spare.

1.Age At least 4.5 billion years, in present state.

2.Distance :

Mean distance from Earth 1.5 X 108 km

Variation in distance through the year +/- 1.5 per cent

3.Diameter 1.39 X 10^6 km (or 109 times the diameter of

the Earth and 9.75 times the diameter of

Jupiter)

4.Volume 1.41 X 10^33 cm^3 (or 1.3 million times the

volume of the Earth)

5.Mass 1.99 X 10^30 kg (or 333,000 times the weight

of the Earth)

6.Sunspots 3000 G

7.Polar Field 1 G

8.Bright, chromospheric network 25 G

9.Emphemeral (unipolar) active regions 20 G

10.Chromospheric plagues 200 G

11.Prominences 10 to 100 G

21


B.S.P.P. 2014-15

12.Earth 0.7 G at pole

13.Chemical composition of photosphere

(by weight, in per cent) :

Hydrogen 73.46

Helium 24.85

Oxygen 0.77

Carbon 0.29

Iron 0.16

Neon 0.12

Nitrogen 0.09

Solar energy can be a major source of power. Its Potential is 178 billion mw which is about

20,000 times the world's demand. But so far it could not be developed on a large scale. Sun’s

energy can be utilized as thermal and photovoltaic.

Solar energy has the greatest potential of all the sources of renewable energy and if only a

small amount of this form of energy could be used, it will be one of the most important supplies of

energy specially when other sources in the country have depleted.

The solar power where sun hits atmosphere is 10^17 watts, whereas the solar power on

earth's surface is 10^13 watts. Therefore, the sun gives us 1000 times more power than we need.

If we can use 5% of this energy, it will be 50 times what the world will require. The energy radiated

by the sun on a bright sunny day is approximately 1kw/m^2.

.

22


B.S.P.P. 2014-15

WHAT IS PROJECT ?

Project management is the discipline of planning, organizing, securing and managing

resources to bring about the successful completion of specific project goals and objectives. It is

sometimes conflated with program management, however technically that is actually a higher

level construction: a group of related and somehow interdependent engineering projects.

A project is a temporary endeavor, having a defined beginning and end (usually

constrained by date, but can be by funding or deliverables), undertaken to meet unique goals and

objectives, usually to bring about beneficial change or added value. The temporary nature of

projects stands in contrast to business as usual (or operations), which are repetitive, permanent

or semi-permanent functional work to produce products or services. In practice, the management

of these two systems is often found to be quite different, and as such requires the development

of distinct technical skills and the adoption of separate management.

The primary challenge of project management is to achieve all of the project goals and

objectives while honoring the preconceived project constraints. Typical constraints are scope,

time, and budget. The secondary—and more Ambitious-challenges are to optimize the allocation

and at% integration of inputs necessary to meet pre-defined objectives.

23


B.S.P.P. 2014-15

PROJECT MEANS

The word project consists of seven letters where each has its own significance as follows:

P = Planning

Planning is the word which idea of work proposed to be done. As a fact, a word without

planning is just like a ship without the radar and compass.

R = Resources

Resources are the means, which guide to promote the functions of the plant. Without

suitable resources, a project cannot work satisfactorily. There must be all necessary resources in

other to good project work.

O = Operation

Operation is actually all the types of work, which are promoted by the worker to complete

the object.

J = Joint Effort

If means those combined efforts of workers and other staff to complete the works.

E = Engineering Function

Both the bodies i.e. planning & engineering bodies work together with Engineers though

their techniques for good production all technical work is based on Engineering Function so it is

very important.

C = Communication

For execution of plan, the communication is very necessary. The material required for

project work can only be through when proper communication is available.

24


B.S.P.P. 2014-15

T = Task

Task of working body and control the working body. As a matter of fact, the word

"PROJECT" is used specially for construction purpose.

AIM OF THE PROJECT

To make up students mind, not only, to work individually but also to work in team.

To get the knowledge of each student in various subjects which he has studied before.

To prepare the student and treat them not only to make project but also to decide design

cost of material and time advantages and disadvantages themselves.

The student can know that which and what kind of difficulties and constrains they have to

face and find the right decision in difficulties.

SELECTION OF PROJECT

Projects are proposed keeping many things in mind such as below:-

Will the cost be economical?

Will the project meet the thought expectations?

Will the use of solar energy give success to start the compressor?

Market survey should be done before selecting the project.

The cost should be compared with the cost of same product available in the market by

other companies.

Reviews should be taken from the people about your project.

The above points should be kept in mind before selecting a project.

25


B.S.P.P. 2014-15

MARKET SURVEY

Market survey is essential before planning the actual production. During market survey

knowing and considering other available similar product; their future demand prices and quality.

Market survey helps to know about location of market scope and sales. Availability of material,

equipment, and manpower. Above all facts mass production should be planned.

26


B.S.P.P. 2014-15

DESCRIPTION OF PROJECT

(A) Project Planning

(B) Working Principle of “SOLAR AIR CONDITIONER”

(A) PROJECT PLANNING

Project planning consists of following steps :

MARKET SURVEY

PROJECT REPORT: It is a type of survey which helps with the information about the

product development & planning to make safe formation & magnifies the market volume.

PROJECT CAPACITY

It refers to the capacity of project like small project, huge project, simple project,

complicated project, durable project etc.

RAW MATERIALS REQUIRED

Planning also includes the quantity & quality of required material. It also includes the type

of material.

OPERATION PLANNING

It is planning of various operations which will be carried out on the different parts of the

project work.

METHOD &TIME STUDY

It resemble the estimating time duration for the completion of a project work after selecting

some specific favorable method.

27


B.S.P.P. 2014-15

MECHANICAL HANDLING

The mechanical equipment & the mechanical method used for the Completion of work fall

under category of mechanical handling.

MATERIAL HANDLING

The machine labor & packing materials required are included in material handling it also

refers to the methods & process used for handling materials.

BUDGETING & COSTING

Budgeting is the planning of capital & revenue in advance while costing is to determine an

actual costing is of product after manufacturing it.

DESIGN & LAY-OUT

The most important stage of project work is design and lay-out. For having a perfect

assured design for an efficient lay-out.

(B) Working Principle

It works on the principle to run air conditioner by solar energy.

Solar energy received from the sun is concentrated on the solar panel to convert it into

electric energy.

It is connected to the battery to store the converted electric energy in it.

Then the battery is connected to the invertor and invertor is connected to air conditioner.

When the necessary connections are made the air conditioner starts and gives desired

cooling.

28


B.S.P.P. 2014-15

PARTS OF SOLAR SYSTEM

Solar panel

Solar panel refers either to a photovoltaic module, a solar thermal energy panel, or a set

of solar photovoltaic (PV) modules electrically connected and mounted on a supporting structure.

A PV module is a packaged, connected assembly of solar cells. Solar panels can be used as a

component of a larger photovoltaic system to generate and supply electricity. Electrical

connections are made in series to achieve a desired output voltage and/or in parallel to provide a

desired current capability. We need four solar panel each of 250watts.

29


B.S.P.P. 2014-15

Battery

Battery store the electric power in the form of a chemical reaction. Without storage you

would only have power when the sun is shining or the generator is running. We need battery of

48V.

30


B.S.P.P. 2014-15

Invertor

The power invertor is the heart of the system. It makes 220 volts AC from the 12 volts DC

stored in the batteries. It can also charge the batteries if connected to a generator or the AC line.

For 12v applications an invertor is not required .An invertor should only be required when it is

necessary to convert the 12v input to power a 220v standard application.

31


B.S.P.P. 2014-15

Charge controller

A charge controller is needed to prevent the overcharging of the battery. Proper charging

of battery will prevent the damage and increase the life and performance of it.

32


B.S.P.P. 2014-15

Refrigerants

Refrigerants can be defined as medium by which heat transfer in refrigeration system takes

place. It absorbs latent heat at low temperature in evaporator and gets converted from liquid to

vapour, thus producing cooling effect. It rejects latent heat at atmospheric temperature in

condenser and it’s phase will be changed from vapour to liquid. Except air, all refrigerants change

their phase during operation.

Refrigerant cooling cycle diagram

33


B.S.P.P. 2014-15

AIR CONDITIONER

Air conditioning:

It is defined as “A process of treating air so as to control simultaneously its temperature,

humidity, cleanliness and distribution to meet requirement of the conditioned space.

Parts:

1. Compressor 2. Condenser

3. Expansion valve 4. Evaporator

5. Receiver drier 6. Condenser fan

7. A.C. blower motor

34


B.S.P.P. 2014-15

Compressor

The AC compressor is the workhorse of the system and is driven by your car’s engine via

a series of belts and pulleys. It’s function is to transfer and compress gas from the low-pressure

(intake) side of the ac system to the high pressure (discharge) side of the closed system. The ac

compressor draws the refrigerant (while in gas state) from the ac evaporator, where it has

gathered heat from your vehicle interior. It then compresses the gas refrigerant under high-

pressure and send it off to the ac condenser. Once the hot compressed gas enters the condenser,

it begins to cool and expel heat as it travel towards the bottom of the ac condenser where it has

reverted back to a cool liquid state. The cooled liquid gas then begins it’s journey back toward the

ac evaporator. This gives a general idea (oversimplified) how the process works.

35


B.S.P.P. 2014-15

Condenser

The ac condenser and your car’s radiator often look quite similar in appearance. The

compressor of the car generate compressed gas and sends it along to the top of the condenser,

where the gas begin to cool. The gas continues to cool and condense as it makes it way through

the serpentine-like coil arrangements, before exiting the bottom of the condenser as a high-

pressure liquid. The condenser is usually located in front of your car’s radiator.

36


B.S.P.P. 2014-15

Expansion valve

Expansion valves regulate the amount of liquid refrigerant flowing from the condenser to the

evaporator based upon the evaporator pressure. A thermal expansion valve will include a

temperature sensor and meters the amount of refrigerant flowing into the evaporator.

37


B.S.P.P. 2014-15

Evaporator

The ac evaporator serves in multiple capacities, but its function is to absorb heat which

may have built up on a hot day inside your car’s interior. The evaporator contains cold Freon gas.

The cold Freon gas passes through the evaporator and makes the evaporator very cold. The ac

blower fan is located behind the evaporator and blows air across it and that cold air travels through

the dash duct work and out the vents inside the car. The water you see dripping from under the

passenger side of the car is coming from condensation at the evaporator core, and is a result of

the AC system doing his job.

38


B.S.P.P. 2014-15

Receiver drier

Air conditioning systems utilize a receiver drier to extract moisture from the system. The

receiver drier is used on ac systems which make use of on expansion valve to control refrigerant

flow and is located on the high-pressure side of the system, between compressor and the

condenser. The receiver drier stores a portion of the system’s refrigerant and contains a moisture

absorbing substance to remove any moisture the system may become contaminated with.

39


B.S.P.P. 2014-15

Condenser fan

The ac condenser fan’s job is to assist in cooling the hot compressed gasses supplied by

the compressor as they pass through the condenser. The function of the condenser fan, is also

to supply additional cooling to the vehicle’s radiator located just behind the condenser. In the

event the condenser fan is not operating as intended, or has ceased to function at all, your system

will not operate efficiently . Air flow over the condenser and engine radiator is essential.

Inoperative fans will always cause higher than normal HI side pressure.

40


B.S.P.P. 2014-15

AC Blower motor

The ac blower motor works in conjunction with the evaporator to remove heat and cool

your vehicle interior. He is usually located underneath the dash and connected to ducting where

it pulls-in the warm air from the interior and pushes it across the cool coils and fins of the

evaporator and send the cold air back to the car’s interior.

41


B.S.P.P. 2014-15

CALCULATION

solar constant is 1370 W/m2

42


B.S.P.P. 2014-15

43


B.S.P.P. 2014-15

44


B.S.P.P. 2014-15

Specifications of 50Hz models

45


B.S.P.P. 2014-15

Dimentions of 50hz model

Wiring diagram of 50Hz model

46


B.S.P.P. 2014-15

Temperature, pressure, amphere chart of 50Hz model

47


B.S.P.P. 2014-15

Range of usage and limitation of 50Hz model

48


B.S.P.P. 2014-15

Noice characteristic chart of 50Hz model

49


B.S.P.P. 2014-15

ADVANTAGES

Solar air conditioning provides a great package involving benefits. Installation expenses

can be reduced through tax credits, deductions and also refunds.

Solar air conditioning does not use any Freon or other hazardous chemicals.

Solar energy may be the best way to obtain replenishes able power.

It proves economical on long run.

Solar energy does not cause any pollution.

Sunlight is totally free. There is of course the initial investment for the equipment. After the

initial capital outlay you won’t be receiving a bill every month for the rest of your life from

the electric utility.

Solar power can generate electricity no matter how remote the area as long as the sun

shines there. Even in areas that are inaccessible to power cables solar power can produce

electricity.

Solar power is used to charge batteries so that solar powered devices can be used at night.

50


B.S.P.P. 2014-15

DISADVANTAGES

Solar energy can only be harnessed when it is daytime.

In cloudy conditions solar collector cannot work properly as sun rays are not uniform.

Solar collectors, panels and cells are relatively expensive to manufacture.

The batteries are large and heavy and need storage space. They also need replacing from

time to time.

Less efficient due to intermittent supply of suns radiation.

Process totally dependent on supply of suns radiation.

51


B.S.P.P. 2014-15

COST ESTIMATION OF PROJECT

Name of part Quantity Price per unit (Rs.) Total price (Rs.)

Solar panel(240watt) 3 8,400 25,200

Battery(880AH) 1 9,500 9,500

Charge controller (30

amp, 12V/24V)

1 3,300 3,300

Inverter (650 VA) 1 5,000 5,000

Air conditioner (0.75

ton)

1 15,000 15,000

Total 58,000

52


B.S.P.P. 2014-15

Conclusion

It reduces the cost of air conditioning compare to normal air conditioner. It is eco-friendly.

It is efficient for cooling in small area. Initial cost of its installation is high but on long run it proves

eco-friendly. We got lot of knowledge regarding our field which is not available in the book. We

learnt how to work in team by dividing the load and work with team spirit.

53


B.S.P.P. 2014-15

REFERENCES

www.google.co.in

www.google.co.in/images

www.wikipedia.org

www.solarairconditioner.com

www.youtube.com

www.mechanicalprojectideas.com

www.slideshare.com

www.snapdeal.com

www.homeshop18.com

[pdf] R&AC Lecture 32

[pdf] solar air conditioning

[pdf] Handbook of Air Conditioning and Refrigeration

http://www.google.co.in/

http://www.google.co.in/images

http://www.wikipedia.org/

http://www.solarairconditioner.com/

http://www.youtube.com/

http://www.mechanicalproject/

http://www.slideshare.com/

http://www.snapdeal.com/

http://www.homeshop18.com/

solar air conditioner - information and library...

Documents