2 edition of Effect of longitudinal heat conduction on rotary regenerators found in the catalog.
|Contributions||Naval Postgraduate School (U.S.)|
|The Physical Object|
|Pagination||1 v. :|
signifies the convection heat transfer between fluid and matrix. Similarly, in Eq. (2) left-hand side represent the accumulation of heat in fluid, and right-hand side represents convection heat transfer between fluid and matrix. Longitudinal conduction effect In regenerator the matrix absorbs heat alternatively from hotAuthor: Debashis Panda, Manoj Kumar, A. K. Satapathy, R. K. Sahoo, Sunil K. Sarangi. Predicting performance of regenerative heat exchanger Christian Falk Dept. of Energy Sciences, Faculty of Engineering, in rotary regenerators can be designed to optimize pressure drop • Longitudinal heat conduction in the wall and the fluids is negligible.
Hence, longitudinal heat conduction in the matrix wall occurs in the same direction through both periods. Effect of longitudinal wall heat conductivity adds to the governing differential equation dimensionless number λ, where: And kw - is matrix thermal conductivity, Ak,t – is section area of the matrix, L is matrix depth. Inﬂuence of Longitudinal Wall Heat Conduction Inﬂuence of Transverse Wall Heat Conduction Simpliﬁed Theory Inﬂuence of Pressure and Carryover Leakages Modeling of Pressure and Carryover Leakages for a Rotary Regenerator Inﬂuence of Matrix Material, Size, and Arrangement Summary
Heat transfer modeling in COMSOL Multiphysics The physics used in COMSOL is heat transfer. The domains of rotary elements are solved for by using the heat transfer in solids. The rotation of the elements is also defined. The flue gas and the air to be heated are solved for by using the heat transfer . Process Heat Transfer presents comprehensive coverage of both classical and new topics on the subject. Classical aspects discussed include shell-and-tube heat exchangers, double pipe exchangers, reboilers, and condensers. New topics covered include process integration, heat exchanger selection, heat transfer associated with thermodynamic cycles, and ohmic heating.
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Effect of longitudinal heat conduction on rotary regenerators. Item Preview remove-circle Effect of longitudinal heat conduction on rotary regenerators. by Bahnke, Gustavo D.; Publication date Topics Mechanical engineering Publisher Monterey, California: U.S. Naval Postgraduate SchoolPages: EFFECTOFLONGITUDIW [CONDUCTION ONROTARYREGENERATORS by /f Lieutenant,ChileanNavy Submittedinpartialfulfillmentof therequirementsforthedegreeof.
Effect of longitudinal heat conduction on rotary regenerators. The general differential equations describing the behavior of the rotary regenerator including longitudinal heat conduction in the direction of fluid flow are sufficiently complicated to preclude a complete analytical solution.
A few solutions found in the literature restricted Author: Gustavo D. Bahnke. The effect of matrix longitudinal heat conduction = FIG. Effect of matrix longitudinal heat conduction on temperature distributions of matrix in rotary heat exchanger at constants: NTUi = NTU^ = 6 and NTU^ = NTU^ = FIG.
by: In the application part, the solution for a model in analysis of an influence of longitudinal conduction in the matrix on effectiveness of rotary heat regenerator in a wide range of dimensionless parameters as well as for the particular matrix applied in air-conditioning was by: 4.
In the application part, the solution for a model in analysis of an influence of longitudinal conduction in the matrix on effectiveness of rotary heat regenerator in a wide range of dimensionless.
Some Additional Data on Longitudinal Wall Heat Conduction in Counter Flow Rotary Regenerators Heat TransferProceedings of the Tenth International Heat Transfer Conference, by: 5. Porowski and Szczechowiak  investigated the effect of longitudinal conduction in the matrix on effectiveness of the rotary heat regenerator is shown large axial temperature gradient in the wall, longitudinal heat conduction reduces the regenerator effectiveness and the overall heat-transfer.
Here, the heat exchange takes place indirectly from the hot flue gases to the air through some intermediate medium acts as heat storage. The main advantages of rotary regenerators are economy of space, greater thermal efficiency, and lower capital costs. One major disadvantage of this type is leakage that may be as high as 10%.
One consequence of this is that in regenerative heat exchangers or thermal regenerators, the hot and cold fluids pass through the same channels in the packing, alternately, both fluids washing the same surface area.
In recuperators, the hot and cold fluids pass. Their papers describe the considerable interest shown at that time in the application of rotary regenerators to the gas-turbine cycle for high-temperature exhaust-gas thermal regeneration.
Keywords Heat Transfer Coefficient Wall Effect Regenerator Length Heat Transfer Area Longitudinal ConductionAuthor: Robert A. Ackermann. Heat Transfer Analysis.
The ε‐NTU o Method The Λ–Π Method. Influence of Longitudinal Wall Heat Conduction. Influence of Transverse Wall Heat Conduction. Influence of Pressure and Carryover Leakages. Influence of Matrix Material, Size, and Arrangement. Summary. References. Review Questions.
Problems. The aim of this study is to discuss the effect of different boundary conditions on the heat transfer efficiency in a regenerator, and improve the efficiency of heat transfer for energy-saving.
determine the effect of longitudinnl heat conduction in rotary regenerators for steady state conditions. In the developntent no assumptions are made which would restrict the range of parameters for which the analysis would be applicable.
The conduction effect on the regenerator effe~tivcness was evaluated. Longitudinal wall heat conduction in counterflow rotary regenerators have been extensively studied by Bahnke and Howard, Mondt, Romie, Skiepko and others as summarized in the paper.
Results in 's were obtained numerically, and those in 's are obtained from an analytical by: 1. CHAPTER 17 HEAT EXCHANGERS R.
Shah* and D. R Sekulib University of Kentucky INTRODUCTION A heat exchanger is a device that is used for transfer of thermal energy (enthalpy) between two or more fluids, between a solid surface and a fluid, or between solid particulates and aFile Size: 2MB.
Thorough revision of fabrication of shell and tube heat exchangers, heat transfer augmentation methods, fouling control concepts and inclusion of recent advances in PHEs New topics like EMbaffle ®, Helixchanger ®, and Twistedtube ® heat exchanger, feedwater heater, steam surface condenser, rotary regenerators for HVAC applications, CAB brazing and cupro-braze radiators.
Heat Exchanger Design Handbook Kuppan Thulukkanam This comprehensive reference covers all the important aspects of heat exchangers (HEs): design and modes of operation and practical, large-scale applications in process, power, petroleum, transport, air conditioning, refrigeration, cryogenics, heat recovery, energy, and other industries.
A mathematical model of condensation, evaporation, thermal conductivity and heat transfer is presented for calculating the fluid and matrix temperatures effect on the regenerator performance. The governing differential equations have been formulated in terms of the characteristic dimensionless groups (Π t, Λ t, and Z t).Cited by: A history of compact heat exchangers is presented, along with recent advances in Japan, other developments in the field, and a review of boiling, condensing, and other aspects of two-phase flow in plate-fin heat exchangers.
Specific attention is devoted to prediction of heat and water vapor exchanger performance, wound parallel plate exchangers for air-conditioning applications, a new plate Cited by:. Book Description. Cryogenic Heat Transfer, Second Edition continues to address specific heat transfer problems that occur in the cryogenic temperature range where there are distinct differences from conventional heat transfer problems.
This updated version examines the use of computer-aided design in cryogenic engineering and emphasizes commonly used computer programs to address modern.the fresh air in rotary heat regenerators, a small part of the fresh air is used for purging the heat transfer matrix during its transfer longitudinal heat conduction can be neglected was computed by Lambertson /1/.
The Lambertson is used for evaluating the effect on the heat transfer efficiency ofAuthor: P. Worsoe-Schmidt.In this paper, a numerical simulation of fluid flow and heat transfer in a rotary regenerator is presented.
The numerical method is based on the simultaneous solution of the transient momentum and energy equations using a finite volume scheme. To validate the model, the numerical results are compared with.