Paper Information

Journal:   MODARES MECHANICAL ENGINEERING   MARCH 2017 , Volume 16 , Number 12 #F0074; Page(s) 583 To 592.
 
Paper:  THE EFFECT OF OPERATING CONDITIONS ON THE OPTIMAL PERFORMANCE OF A TWO-BED ADSORPTION COOLING CYCLE
 
Author(s):  SHARIFZADEH MOHAMMAD, GHAZIKHANI MOHSEN*, NIAZMAND HAMID
 
* DEPARTMENT OF MECHANICAL ENGINEERING, FERDOWSI UNIVERSITY, MASHHAD, IRAN
 
Abstract: 

In this study, energy and exergy analysis of a two bed adsorption cooling system have been performed.
Silica gel-water has been chosen as the adsorbent-refrigerant pair. Analysis is performed for evaluating the effect of operating conditions on the optimal timing and then on the maximum value of the SCP, COP, effectiveness and the minimum value of internal irreversibility and external irreversibility. A lumped parameter mathematical model and a global optimization method called the particle swarm optimization have been used for this purpose. In this model, internal and external irreversibility have been calculated with the new method without calculating irreversibility of the cycle internal component.
Energy analysis showed that maximum of SCP increases with the increase of the mass flow rate and heat source temperature. Furthermore, an increase in the heat source temperature causes an increase in the COP, but an increase of the mass flow rate causes a decrease in the COP. Exergy analysis revealed that depending on the mass flow rate and heat source temperature, 65-90% of input exergy was expended by internal irreversibility, 1–20% was expended by external irreversibility and 8-14% is transferred to the cold reservoir in evaporator. The results also indicate, if the mass flow rate is less than 0.6 kg/s, the maximum of effectiveness occurs at 75oC, but if the mass flow rate is more than 0.6 kg/s, the maximum of effectiveness occurs at 65oC.

 
Keyword(s): ADSORPTION SYSTEM, EXERGY, EFFECTIVENESS, COEFFICIENT OF PERFORMANCE
 
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