A numerical model for the analyses of heat transfer and leakages in a rotary air preheater

Drobnič, Boštjan; Oman, Janez; Tuma, Matija

doi:10.1016/j.ijheatmasstransfer.2006.05.027

Cited by 40 publications

(22 citation statements)

References 7 publications

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“…There are a number of works devoted to the mathematical modeling of the RRAP where formulas are given to calculate the values of the parameters above on the basis of molecular physics laws [1][2][3], [8], [9]. In addition, finding the numerical parameters characterizing the RRAP is only possible with a certain accuracy.…”

Section: Finding the Coefficients Of The Systemmentioning

confidence: 99%

“…Monitoring and control of the temperatures of air and gas leaving the RRAP and especially the temperature of the nozzles is the important problem for the effective exploitation of the RRAP [3], [15], [17][18][19]. The direct measurement of the temperatures of air and gas of both inlet and outlet is easily carried out; in contrast, the observation and control of the nozzle temperature require to use sophisticated measuring tools and represent an important problem.…”

Section: Introductionmentioning

confidence: 99%

“…In recent decades, a variety of mathematical models of the heat exchange process in RRAPs were suggested [1][2][3], [5] and see also [8]. It should be noted that the thermodynamic process in RRAP nozzles can be in principle described by the classical heat conduction equation, but, without additional simplifying assumptions, it is difficult to write out the boundary conditions since the nozzle system has a rather complex geometry.…”

Section: Introductionmentioning

confidence: 99%

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Simplified Model of the Heat Exchange Process in Rotary Regenerative Air Pre–heater

Азамов

Bekimov

2016

UMJ

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A simplified mathematical model of a rotary regenerative air pre-heater (RRAP) is suggested and studied based on the averaged dynamics of the heat exchange process between nozzles and a heat carrier (i.e. air or gas-smoke mixture). Averaging in both spatial coordinates and time gives a linear discrete system that allows deriving explicit formulas for determining the characteristics of the air heater and establishing some properties such as periodicity, stability, ergodicity and others.

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Section: Finding the Coefficients Of The Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simplified Model of the Heat Exchange Process in Rotary Regenerative Air Pre–heater

Азамов

Bekimov

2016

UMJ

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“…Drobnic and Tuma [9] used both numerical and experimental methods to estimate the pattern of Ljungstrom exhaust gas temperature. Sanaye et al [10] specified the importance of optimizing the speeds of rotation and mass flow rate by using analytical relationships and empirical models.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional simulation of rotary air preheater in steam power plant

Heidari-Kaydan

Hajidavalloo

2014

Applied Thermal Engineering

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“…The lack in the experimental results is due to the limitation of their experimental setup, as they concluded. Drobnič et al [6] developed a 3-D mathematical model which enabled the analysis of the flue gas flow through the matrix of the preheater. They have focused on the influence of the leakages on the flue gas parameters.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of rotary air preheater by the use of pin shaped turbulators

Al-Kayiem

Mahdi

2010

Advanced Computational Methods and Experiments in Heat Transfer XI

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The present paper presents the contribution on the performance enhancement study of a regenerative Ljongstrom type air preheater. The experimental analyses are carried out to study the performance enhancement of the system by regular artificial roughening of the heat transfer elements using pin-shaped turbulators (promoters). An experimental test rig is designed and fabricated to simulate the transient operation of the rotary air-preheat system. To study the hydraulic and thermal processes and their combined influences on the system performance, the friction factor and the convection heat transfer coefficient, with and without the turbulators, were evaluated from experimental measurements. The investigations have been carried out under various designs and operational conditions. The results were obtained and presented for Reynolds number in the range of 0.93 x 10 5 to 2.35 x 10 5 in the thermal discharge period and 0.58 x10 5 to 1.8 x 10 5 in the thermal charging period. The roughening effect was also investigated by varying the pin pitch to pin height ratio, P/e; additionally, the effect of the thermal elements numbers in the working section was considered. The artificial roughening by the pins enhanced the performance of the rotary air preheater, and best results have been achieved at P/e=10.

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A numerical model for the analyses of heat transfer and leakages in a rotary air preheater

Cited by 40 publications

References 7 publications

Simplified Model of the Heat Exchange Process in Rotary Regenerative Air Pre–heater

Simplified Model of the Heat Exchange Process in Rotary Regenerative Air Pre–heater

Three-dimensional simulation of rotary air preheater in steam power plant

Performance enhancement of rotary air preheater by the use of pin shaped turbulators

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