ADSORPTION REFRIGERATION

USINGSOLAR POWER

GROUP MEMBERSMASUK ALAMFAIZAN ALAM

REHAN AHMAD KHANMOHD.IMRAN KHAN

MOHD.RIZVAN

INTRODUCTION Solar adsorption refrigeration is an option

to overtake the drawbacks of the conventional cooling system.

Adsorption refrigeration system uses adsorbent beds to adsorb and desorbs a refrigerant to obtain cooling effect.

Adsorption systems mainly use a natural working fluid which have zero ozone depletion potential.

Inventors propose technologies to improve adsorption system and make it become a realistic alternative.

LAYOUT OF SIMPLE ADSORPTION COOLING SYSTEM

SOME TERMS RELATED TO THIS SYSTEM

ADSORBER It is the prime device present in this refrigeration

system which is filled with the mixture of Adsorbent & Adsorbate.

ADSORBENT These are the substances used for adsorbing the

adsorbate. Eg- zeolite, silica gel, activated carbon, etc.

ADSORBATE These are the coolant or refrigerants which gets

adsorb in adsorbant and desorbs when heated. Eg- water, ammonia, etc.

HOW DOES IT WORK?

PHASE 1 Heating and pressurization

The adsorbent temperature increases, which induces a pressure increase, from the evaporation pressure up to the condensation pressure. This period is equivalent to the "compression" phase in compression cycles.

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PHASE 2Heating and desorption

+ condensationDuring this period, the adsorber continues receiving heat while being connected to the condenser, which now superimposes its pressure. The adsorbent temperature continues increasing, which induces desorption of vapor. This desorbed vapor is liquefied in the condenser. The condensation heat is released to the second heat sink at intermediate temperature. This period is equivalent to the "condensation" in compression cycles.

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PHASE 3Cooling and

depressurization During this period, the adsorber releases heat while being closed. The adsorbent temperature decreases, which induces the pressure decrease from the condensation pressure down to the evaporation pressure. This period is equivalent to the "expansion" in compression cycles.

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PHASE 4 Cooling and adsorption + evaporation

During this period, the adsorber continues releasing heat while being connected to the evaporator, which now superimposes its pressure. The adsorbent temperature continues decreasing, which induces adsorption of vapor. This adsorbed vapour is evaporated in the evaporator. The evaporation heat is supplied by the heat source at low temperature. This period is equivalent to the "evaporation" in compression cycles.

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POSSIBLE COMBINATIONS OF ADSORBATE AND ADSORBENT

Zeolite & water Silica gel & water Activated carbon & methanol Activate carbon & NH3

We are intending to take silica gel and water or zeolite and water, since they are easily available and has got low cost.

OUR PROPOSED ARRANGEMENT OF THE SYSTEM

CHARACTERISTICS OF OUR SYSTEM

Since we are going to use only one adsorber bed, the process of cooling will be intermittent.

COMPONENT TECHNICAL SPECIFICATION

Condenser 200W, water cooledEvaporator Material-Copper, 150WExpansion Device Capillary tubeAdsorbent Bed Material- stainless steelSolar PanelsAdsorbent Silica GelAdsorbate Water

ADVANTAGES

Consumes less energy no depletion of ozone Eco-friendly

and causes layer. Simplicity of construction. Lack of moving parts Simple control Quiet operation. No vibration Low operating cost

CHALLENGES Feasible arrangement of the

components Assembly in small area. Increament of COP. To reduce manufacturing and

operating cost. Leak proof. To maintain pressure in the

adsorber equal to condensor pressure.

CONCLUSION

For adsorption refrigeration system, significant achievements have been obtained on the use of various technologies to reduce the complexity of system structure, initial cost, to increase the system operation reliability as well as energy performance.

However, intensive research is still needed to: i) enhance the amount of recovered

thermal energy, without adding complexity into the design and operation of system

ii) optimize the recovered mass rate to achieve the best effect.

Applied material research could produce new combined material in order to achieve a higher SCP for adsorption refrigeration system

Thanks