Investigations on the effect of graphene coating on thermophysical properties of aluminium and mild steel for cross flow heat exchanger

Cross flow heat exchangers, when applied to cool data center rooms, use external air (process air) to cool the air stream coming from the data center room (primary air). However, an air–air heat exchanger is not enough to cope with extreme high heat loads in critical conditions (high external temperature). Therefore, water can be sprayed in the process air to increase the heat dissipation capability (wet mode). Water evaporates, and the heat flow rate is transferred to the process air as sensible and latent heat. This paper proposes an analytical approach to predict the behavior of a cross flow heat exchanger in wet mode. The theoretical results are then compared to experimental tests carried out on a real machine in wet mode conditions. Comparisons are given in terms of calculated versus experimental heat flow rate and evaporated water mass flow rate, showing a good match between theoretical and experimental values.

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Investigation the Performance of Cross Flow Heat Exchanger

International Journal of Science and Research (IJSR) ◽

10.21275/v5i4.nov162594 ◽

2016 ◽

Vol 5 (4) ◽

pp. 637-641

Keyword(s):

Heat Exchanger ◽

Cross Flow ◽

Flow Heat

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Simulation of Cross Flow Heat Exchanger for Multi Tubes Using FLUENT 6.3.26

Environmental Research Engineering and Management ◽

10.5755/j01.erem.65.3.4453 ◽

2013 ◽

Vol 65 (3) ◽

Author(s):

Suneela Sardar ◽

Shahid Raza Malik

Keyword(s):

Heat Exchanger ◽

Cross Flow ◽

Flow Heat

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Minimum Irreversibility Criteria for Heat Exchanger Configurations

Journal of Energy Resources Technology ◽

10.1115/1.2795989 ◽

1999 ◽

Vol 121 (4) ◽

pp. 241-246 ◽

Cited By ~ 5

Author(s):

F. E. M. Saboya ◽

C. E. S. M. da Costa

Keyword(s):

Heat Capacity ◽

Heat Exchanger ◽

Heat Exchangers ◽

Cross Flow ◽

Second Law Of Thermodynamics ◽

The Other ◽

Maximum Heat ◽

Transfer Rates ◽

Mass Flow Rates ◽

Flow Heat

From the second law of thermodynamics, the concepts of irreversibility, entropy generation, and availability are applied to counterflow, parallel-flow, and cross-flow heat exchangers. In the case of the Cross-flow configuration, there are four types of heat exchangers: I) both fluids unmixed, 2) both fluids mixed, 3) fluid of maximum heat capacity rate mixed and the other unmixed, 4) fluid of minimum heat capacity rate mixed and the other unmixed. In the analysis, the heat exchangers are assumed to have a negligible pressure drop irreversibility. The Counterflow heat exchanger is compared with the other five heat exchanger types and the comparison will indicate which one has the minimum irreversibility rate. In this comparison, only the exit temperatures and the heat transfer rates of the heat exchangers are different. The other conditions (inlet temperatures, mass flow rates, number of transfer units) and the working fluids are the same in the heat exchangers.

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