CBSE Science Exhibition Project Example Theme “Industry” Project “Cheap Refrigeration System” Science Fair Project Class 10 and 12

Project Name : Cheap Refrigeration System

Project Theme: Industry

Write Up: The objective behind this project is to create an ECO-FRIENDLY and a cheap refrigeration system which  will be easily accessible to the rural people where electricity is not available or accessible in abundance.  This project will be a positive step towards reducing carbon footprints. The project brings refreshment to the  people of the rural areas.

Scientific principles:
Water heating is a thermodynamic process that uses an energy source to heat water above its initial temperature. Typical domestic uses of hot water include cooking, cleaning, bathing, and space heating. In  industry, hot water and water heated to steam have many uses.

Evaporation is a type of vaporization of a liquid that occurs from the surface of a liquid into a gaseous phase  that is not saturated with the evaporating substance. The other type of vaporization is boiling, which,  instead, occurs within the entire mass of the liquid and can also take place when the vapor phase is saturated,  such as when steam is produced in a boiler.

Absorption is a physical or chemical phenomenon or a process in which atoms, molecules, or ions enter some bulk  phase – gas, liquid, or solid material.

Refrigeration is a process in which work is done to move heat from one location to another. The work of heat  transport is traditionally driven by mechanical work, but can also be driven by heat, magnetism, electricity,  laser, or other means.

Materials required: condenser, generator, evaporator, absorber, separator, pipes, refrigerator case and iron  plate.

Working process of the refrigerator:

Heat will be supplied to the generator. The heat would come from burning spirit lamp In the generator there  will be a solution of ammonia and water. The heat would raise the temperature of the solution to the boiling  point of ammonia.

The boiling solution would flow to the separator. In the separator the water separates from ammonia gas.

The ammonia gas will now flow upwards to the condenser. The condenser would be composed of metal coils and fins  that would allow the ammonia gas to dissipate its heat and condense into liquid.

The liquid ammonia would make its way to the evaporator, where it would mix with hydrogen gas & would  evaporate, and would produce cold temperatures inside the refrigerator.

The ammonia and hydrogen gas would flow to the absorber. Here, the water that has collected in the separator  will be mixed with ammonia and hydrogen gas. The ammonia would form a solution with the water and would release  the hydrogen gas, which would flow back to the evaporator.The ammonia and water solution would flow towards the  generator to repeat the cycle

Further Scope: This project ensures high coefficient of performance in absorption refrigeration system. This  project is a unique gift to the people who live in areas with no electricity also the project is eco friendly  and low cost which makes it affordable for even weaker sections of the society. The insulation process which is  one of the main reasons for global warming will not be harmful for environment as we can use cyclopentane for insulating doors and cases of the refrigerator. This would cut its equivalent C02 emissions by 400,000 metric  tons every year this change means that. This would cut greenhouse emissions by more than 80%, thus makes an  appliance that ensures greener safer and healthier future earth.

Unique Features:
The unique features of this project (refrigerating system) are the following:

This kind of refrigeration system can work without electricity

The use of ammonia in absorption refrigeration is environmentally friendly as it has no cumulative effects on  environment and has very limited atmospheric life time. The construction of the assembly is relatively simple  and does not take much time.

Name of the School: BVB’s Bhagwandas Purohit Vidya Mandir, Wathoda, Nagpur

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