A numerical model for a dew-point counter-flow indirect evaporative cooler using a modified boundary condition and considering effects of entrance regions

2017 ◽  
Vol 84 ◽  
pp. 36-51 ◽  
Author(s):  
Hamoon Jafarian ◽  
Hoseyn Sayyaadi ◽  
Farschad Torabi
Keyword(s):  
Boundary Condition ◽  
Numerical Model ◽  
Dew Point ◽  
Counter Flow ◽  
Evaporative Cooler

On the exergy analysis of the counter-flow dew point evaporative cooler

Energy ◽  
2018 ◽  
Vol 165 ◽  
pp. 958-971 ◽  
Author(s):  
Jie Lin ◽  
Duc Thuan Bui ◽  
Ruzhu Wang ◽  
Kian Jon Chua
Keyword(s):  
Exergy Analysis ◽  
Dew Point ◽  
Counter Flow ◽  
Evaporative Cooler

Multivariate scaling and dimensional analysis of the counter-flow dew point evaporative cooler

2017 ◽  
Vol 150 ◽  
pp. 172-187 ◽  
Author(s):  
J. Lin ◽  
R.Z. Wang ◽  
M. Kumja ◽  
T.D. Bui ◽  
K.J. Chua
Keyword(s):  
Dimensional Analysis ◽  
Dew Point ◽  
Counter Flow ◽  
Evaporative Cooler

Performance characterization and optimization of counter-flow dew point indirect evaporative cooler through response surface methodology

2021 ◽  
pp. 095765092110079
Author(s):  
Rubeena Kousar ◽  
Muzaffar Ali ◽  
Muhammad Kamal Amjad ◽  
Nadeem Ahmed Sheikh ◽  
Waqas Ahmad
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Air Temperature ◽  
Regression Models ◽  
Cooling Capacity ◽  
Optimal Performance ◽  
Dew Point ◽  
Air Velocity ◽  
Counter Flow ◽  
Evaporative Cooler

The optimal performance of dew point indirect evaporative cooler with respect to the operational environment is a challenging task as the same is affected by many parameters. This paper reports the regression modeling and optimization of a counter flow indirect evaporative cooler using the response surface methodology. Experimentation is conducted using the central composite design and regression models are statistically evaluated for adequacy and found within 7% maximum error limit as compared with literature. Results show that supply temperature and cooling capacity increase with increasing inlet air velocity and inlet air temperature. Moreover, dew point and wet bulb effectiveness have a direct relationship with inlet air temperature and an inverse relationship with inlet air velocity. After validation, the regression models are subjected to single-objective and multi-objective optimization based upon the desirability function technique. The multi-objective formulation reveals that optimal performance of the system is achieved at 41.31 °C inlet air temperature, 3.61 m/sec inlet air velocity, 12 g/kg inlet air humidity, and 24.48 °C water temperature. Finally, an operational envelope is proposed to evolve a zone for the best-suited operation of such a device which ensures a reasonable cooling capacity within 1.5 – 2.5 kW while enabling thermal comfort for the conditioned space.

On the fundamental heat and mass transfer analysis of the counter-flow dew point evaporative cooler

2018 ◽  
Vol 217 ◽  
pp. 126-142 ◽  
Author(s):  
Jie Lin ◽  
Duc Thuan Bui ◽  
Ruzhu Wang ◽  
Kian Jon Chua
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Dew Point ◽  
Counter Flow ◽  
Evaporative Cooler

scholarly journals The energy and exergy analysis of counter-flow regenerative evaporative cooler

2019 ◽  
Vol 23 (6 Part A) ◽  
pp. 3615-3626
Author(s):  
Lei Wang ◽  
Chonghong Zhan ◽  
Jianli Zhang ◽  
Xudong Zhao
Keyword(s):  
Mathematical Model ◽  
Thermal Performance ◽  
Second Law Of Thermodynamics ◽  
Channel Length ◽  
Dew Point ◽  
Air Velocity ◽  
Counter Flow ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis ◽  
Evaporative Cooler

Recently the regenerative evaporative cooler (REC) has drawn great attention from researchers because it can cool the intake air below the wet-bulb temperature and approaching its dew point temperature. For further understanding of the heat and mass transfer occurred in a counter-flow REC, a novel mathematical model is developed based on the law of energy conservation and the principle of the thermodynamic theory. The proposed mathematical model is validated against experimental data from literature. The parametric study is performed to investigate the performance of the REC under different operating and geometrical conditions. It is found that the exergy destruction and exergy efficiency ratio of the REC are strongly influenced by the intake air velocity, the working to intake air ratio and channel gap, followed by the channel length. The working to intake air ratio choosing from 0.3 to 0.4 is appropriate in order to achieve better thermal performance with permissible level of thermodynamic cost. Moreover, the results obtained in this paper reveal that the best thermal performance does not correspond to the best thermodynamic performance. Thus, both the first and second law of thermodynamics should be considered for a comprehensive analysis.

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