Optimisation of heat transfer enhancement devices in a bayonet tube heat exchanger

O'Doherty, Timothy; Jolly, A.J.; Bates, C. J.

doi:10.1016/s1359-4311(99)00064-2

Cited by 12 publications

(3 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where, d/, is the equivalent diameter, which refers to tube diameter (5) in the plain ñnned tubes. The /is Darcy friction factor.…”

Section: Re =mentioning

confidence: 99%

See 1 more Smart Citation

CFD Optimization of Gas-Side Flow Channel Configuration Inside a High Temperature Bayonet Tube Heat Exchanger With Inner and Outer fins

Zeng

et al. 2011

Journal of Engineering for Gas Turbines and Power

View full text Add to dashboard Cite

In this paper, the gas-side fluid flow disttibution inside a bayonet tube heat exchanger with inner and outer fins is numerically studied. The heat exchanger is designed based on the traditional bayonet tube heat e.xchanger. where compact continuous plain fins and wavelike fins are mounted on the outside and inside surfaces of outer tubes, respectively, to enhance the heat transfer performance. However, gross flow maldistribution and large vortices are observed in the gas-side flow channel of baseline design. In order to improve the flow uniformity, three modified designs are proposed. Three vertical plates and two inclined plates ate mounted on the inlet manifold for Model B. For the Model C, another six bending plates are mounted on the middle manifolds and three pairs of them are connected together. The Model D has a similar structure as Model C except for the two additional baffles. The results indicate that the flow distributions of Models C and D are much more uniform under different inlet Reynolds number, especially in the high inlet Reytwtds number. Although the flow distribution of Model D is the best, its pressure drop is 2.6 times higher than that of Model C. Therefore, the design of Model C is the mo.'^t optimized structure. Compared with the original design, the nonunifortnity of Model C can be reduced by 42% while the pressure drop is almost the same under the baseline condition.

show abstract

“…where, d/, is the equivalent diameter, which refers to tube diameter (5) in the plain ñnned tubes. The /is Darcy friction factor.…”

Section: Re =mentioning

confidence: 99%

“…Different concepts of HTHEs were investigated such as Refs. [1][2][3][4][5]. In order to improve the heat transfer performance and reduce the cost, a bayonet tube heat exchanger with fins employed outside and inside outer tubes of bayonet elements was proposed in previous research [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

CFD Optimization of Gas-Side Flow Channel Configuration Inside a High Temperature Bayonet Tube Heat Exchanger With Inner and Outer fins

Zeng

et al. 2011

Journal of Engineering for Gas Turbines and Power

View full text Add to dashboard Cite

show abstract

“…The performance of the cycle was assessed at two heat exchanger maximum wall temperatures, 1423 and 1573 K. The lower of these temperatures is around the maximum temperature achievable using ODS alloys and the higher is that achievable using ceramic heat exchangers [9]. Design studies have been published for such heat exchangers: that of Schulte-Fischedick et al [33] considers ceramic temperatures up to 1523 K and that of O'Doherty et al [34] contemplates gas temperatures of 1673 K. Clearly, such devices have to be sized to accommodate some fouling, but it can be assumed that hot gas filtration (of the kind required for direct firing) is not needed.…”

Section: Recuperated and Externally Fired Cyclesmentioning

confidence: 99%

Thermodynamic and Economic Analysis of Advanced and Externally Fired Gas Turbine Cycles

Ilett

Lawn

2010

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

The thermodynamic performance of a number of advanced gas turbine cycles and equivalent externally fired cycles has been studied to derive optimum efficiencies and work outputs. With external firing, significant improvements in the performance of the advanced cycles over the simple gas turbine cycle were found, demonstrating the potential of such cycles for effective power generation from biomass or other dirty fuels. Cost comparisons have been made and the minimum cost of electricity from each cycle calculated with discounted cash flow. The externally fired cycles benefit from low fuel costs which give favourable electricity costs, although development costs for the high-temperature heat exchanger and other advanced cycle components are likely to be significant. The gas—steam combined cycle when externally fired was found to give the lowest cost of electricity for large-scale generation, with the steam injected and humid air turbine cycles competitive on smaller scales.

show abstract

Study on heat transfer and pressure drop performances of ribbed channel in the high temperature heat exchanger

Wang

Zeng

et al. 2012

Applied Energy

View full text Add to dashboard Cite

Optimisation of heat transfer enhancement devices in a bayonet tube heat exchanger

Cited by 12 publications

References 8 publications

CFD Optimization of Gas-Side Flow Channel Configuration Inside a High Temperature Bayonet Tube Heat Exchanger With Inner and Outer fins

CFD Optimization of Gas-Side Flow Channel Configuration Inside a High Temperature Bayonet Tube Heat Exchanger With Inner and Outer fins

Thermodynamic and Economic Analysis of Advanced and Externally Fired Gas Turbine Cycles

Study on heat transfer and pressure drop performances of ribbed channel in the high temperature heat exchanger

Contact Info

Product

Resources

About