Experimental investigation of a novel magnetically variable conductance thermosyphon heat pipe

Oberoi

Intl J of Energy Research

2021

Summary This paper addresses the effects of critical parameters that affect the performance and lifespan of proton exchange membrane (PEM) fuel cells. Amongst all, control of excess water content and dehydration in PEM fuel cells is the major issue under various operating conditions. Therefore, their effects on cathode, anode, gas diffusion layer (GDL), catalyst layer (CL), and flow channels are summarized in the initial part of this paper. Various active cooling strategies such as air cooling, liquid cooling, and phase change method to extract the waste heat from the stack are represented. The lateral part of this paper throws light on the role of heat pipes, working fluid, and the effect of the addition of nanofluid with pertinent filling ratio (FR) in cooling of PEM fuel cells. This work is intended to aid the selection of cooling methods for PEM fuel cells through the consideration of the variety of affecting parameters preceding major expenditure for wide‐scale production. In future, cost comparison associated with the cooling techniques of the fuel cell would be evaluated.

Section: Thermal Management Of Pem Fuel Cells and Gaps In Technologymentioning

confidence: 99%

Section: Thermal Management Of Pem Fuel Cells and Gaps In Technologymentioning

confidence: 99%

Section: Heat Pipe Technologymentioning

confidence: 99%

See 1 more Smart Citation

Factors influencing the performance of PEM fuel cells: A review on performance parameters, water management, and cooling techniques

Oberoi

Intl J of Energy Research

2021

“…But in the present study, due to the change heat flux in the fire tube, it was necessary to select the appropriate working fluid. By increasing the heat input, a large amount of working fluid evaporates, resulting better heat transfer and consequently, decrease in thermal resistance [25]. Moreover, at low heat inputs, the thermal resistance increases.…”

Section: Selection Of Working Fluidmentioning

confidence: 99%

Experimental investigation of the increasing thermal efficiency of an indirect water bath heater by use of thermosyphon heat pipe

et al. 2020

Natural gas must be preheated prior to pressure reduction in city gate stations (CGSs). Indirect water bath heaters are employed in CGSs for preheating, consume a considerable amount of natural gas for the process. This type of heater has a low efficiency therefore a significant amount of energy is wasted. Due to the high capacity of thermosyphon heat pipe (THP), its utilization in CGS heater were investigated experimentally in this paper. For this purpose, a heater setup was manufactured and its thermal efficiency was calculated. THPs were then designed, manufactured, and utilized between the fire tube and the gas tube. Further the type of working fluid and the range of filling ratio (FR) were discussed and the most effective state was suggested. Moreover, the thermal efficiency of the heater in the presence of THPs was investigated. The obtained results showed that the thermal efficiency of the heater improved up to 13% with the addition of THPs. The most effective state of THPs was associated with the water as working fluid with 20% FR in the front route and methanol as working fluid with 30% FR in the back route of the fire tube.

Proceedings of the Institution of Mechanical Engineers, Part A:

“…6 The heat pipe is composed of different materials such as copper, aluminum, and stainless steel that are suitable for all kinds of applications. 7 Heat pipes require neither the input energy 8 (except for the transferred heat) nor any mechanical moving parts. As a result, they do not need any repair and maintenance.…”

Section: Introductionmentioning

confidence: 99%

Investigating different types of fluids in pulsating heat pipes for improving heat transfer in an air-cooled heat exchanger

Alizadeh

Movahedi

Mirzahosseini

et al. 2022

Air-cooled heat exchangers are utilized in various industries to cool process fluids. To have a better heat transfer, fins are used in the structure of exchangers. In this study, a set of experiments were performed to investigate the improvement in the amount of heat transfer in an air-cooled heat exchanger. For this purpose, a real case study was conducted on air-coolers in a natural gas compressor station; afterward, the finned tubes were replaced by pulsating heat pipes (PHPs), and a different type of fluid was applied to the pulsating heat pipes. The laboratory system was set up to measure the overall heat transfer coefficient under two conditions involving either finned tubes or a PHP with R134, R22, and filled acetone fluids. Finally, the results were verified by the theory method. The results showed that all the three fluid agents (R134, R22, and Acetone) with natural convection of 9.94 m/s, an inlet fluid velocity of 5.54 m/s, and an average feed velocity were able to enhance the heat transfer coefficient by 10, 13, and 11%, respectively. In addition, compared with finned tubes, R134, R22, and Acetone improved the natural convection heat transfer coefficient by 22.2, 18.6, and 21.7%, respectively.