Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11017575 | Applied Energy | 2018 | 13 Pages |
Abstract
Adsorption cooling systems (ACS) are considered as potential alternatives to traditional vapor compression air conditioning systems in heavy-duty vehicles. In ACS, adsorber bed heat exchangers (ABHEx) replace compressors and their appropriate design directly impacts the ACS performance. During operation, ABHEx undergo a large temperature swing to derive a refrigerant in ACS and their response time affects the dynamic behavior of ACS. In this study, a detailed three dimensional non-equilibrium model is developed to study the effects of heat and mass transfer in annular and longitudinal finned tube adsorber beds filled with zeolite-13x particles. The effects of fin height and spacing are studied on the system operating parameters to identify an optimum fin geometry. The simulation results show that a decrease in fin spacing leads to a decrease in the coefficient of performance (COP) and an increase in the specific cooling power (SCP), and no optimum value is observed for them in a specific fin spacing. However, variations of the total cooling power (TCP) maximize at a certain fin spacing. For longitudinal finned tube ABHEx, the optimum averaged fin spacing shifts from 5.4 to 6.8â¯mm for the adsorber beds with 10, 15, and 20â¯mm fin heights, while the optimum fin spacing of annular finned tube ABHEx changes from 5.0 to 6.4â¯mm. Furthermore, the results show that under similar dimensions and operating conditions, an ACS with annular finned tube ABHEx provides a 10% higher total cooling power than that with a longitudinal finned tube ABHEx at the optimum fin spacing. Using the ACS with optimized ABHEx in a truck would annually save about 370â¯L of fuel consumption and decreases greenhouse emissions by up to 738â¯kg CO2e.
Related Topics
Physical Sciences and Engineering
Energy
Energy Engineering and Power Technology
Authors
Behzad Golparvar, Hamid Niazmand, Amir Sharafian, Amirjavad Ahmadian Hosseini,