Heat and Mass Transfer in Agitated, Co-, or Countercurrent Conductive–Convective Heated Drum Dryer

Poós, Tibor; Örvös, Mária

doi:10.1080/07373937.2012.689402

Cited by 23 publications

(9 citation statements)

References 14 publications

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“…Our study is intended to describe heat transfer processes in the evaporator and condenser of heat pumps more accurately than before, which can be achieved by the specification of heat transfer coefficients based on measurements, specially by measurements performed on the refrigerant applied in the heat pump, by the precise definition of measurement conditions, and by determining the error limits and reliability of the formulas obtained. A number of researchers have discussed the determination of the heat transfer coefficient [3][4][5], but their results show high standard deviation [6]. In general, the reliability and limits of applicability of formulas are not published.…”

Section: Introductionmentioning

confidence: 98%

Measurement testing of heat transfer coefficients in the evaporator and condenser of heat pumps

Sánta¹,

Garbai

2014

J Therm Anal Calorim

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In our earlier studies, it has been stated that the validity and limits of correlations developed for the calculation of heat transfer processes in the evaporator and condenser of heat pumps are not published in general. The values yielded for model structures and process characteristics indicate extreme ranges of standard deviation. While the description and physical and mathematical modeling of phenomena occurring in heat pump components have developed really much and the mathematical accuracy of solutions can be increased at one's own discretion, descriptions of changes in heat transfer and heat transfer coefficients in the course of refrigerant flow are quite uncertain. At the same time, these factors highly influence the accuracy of the solution. Our study presents the measurements and the new proposed heat transfer correlations, developed on the basis of such measurements, which can be used for calculating heat transfer in heat pump evaporators and condensers with higher accuracy than existing correlations in the literature.Keywords Evaporator Á Heat transfer coefficient Á Heat pump Á Condenser Á R134aList of symbolsVolumetric flow rate (m 3 h -1 ) M Molecular mass (kg kmol -1 )Greek letters a Heat transfer coefficient (Wm -2 K -1 ) k Thermal conductivity (Wm -1 K -1 ) q Density (kg m -3 )

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Section: Introductionmentioning

confidence: 98%

Measurement testing of heat transfer coefficients in the evaporator and condenser of heat pumps

Sánta¹,

Garbai

2014

J Therm Anal Calorim

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“…The dryer can be dimensioned for operation by using the differential equation to describe changes in the temperature and moisture content of the drying gas [16]. In order to apply this differential equation system, it is essential to know the heat and mass transfer coefficients.…”

Section: Volumetric Evaporation Coefficientmentioning

confidence: 99%

“…In order to extend the measurement range, earlier measurements [16] performed on other materials (millet, sunflower seed, wood block) were also used, assessed and processed in the manner described above. The values yielded are indicated by '+' in Figure 7.…”

Section: Volumetric Evaporation Coefficientmentioning

confidence: 99%

“…The volumetric evaporation coefficient can be determined from measurement data and by using equation (6), wherefrom the modified Sherwood number (Sh') can be produced as follows by applying equations (4), (5), and (10): (14) The modified Reynolds number by taking into consideration the characteristic velocities developed within the apparatus [16]:…”

Section: Volumetric Evaporation Coefficientmentioning

confidence: 99%

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Thermal Dewatering of Waste Sludge in an Agitated Drum Dryer

Poós

Örvös

Horváth

2014

APH

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“…The relative humidity of the gas can be obtained from the equilibrium moisture curve φ = f (X ) [19]. The moisture desorption isotherm was determined by measurements [20]. The desorption isotherm of sorghum represented in Fig.…”

Section: Application Of the Mathematical Modelmentioning

confidence: 99%

Determination of entry length of a fluidized bed dryer using volumetric heat transfer coefficient

Poós

Szabó

2017

IRASE

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Fluidized bed dryers are widely used in several fi elds of industry. Suffi ciently accurate thermal models provide an opportunity to increase the effectiveness of dryers. The required size of a fl uidized bed dryer can be defi ned with the application of mathematical model. This work is aimed at developing mathematical model to investigate the infl uence of operating parameters in a fl uidized bed dryer using volumetric heat transfer coeffi cient. After the defi ning the input parameters of the differential equations, the required entry length of the dryer which effective heat and mass transfer between gas and particles takes place can be estimated. The correct estimation of the entry length is useful in optimal design of a fl uidized bed dryer. Using the model the impact of the drying parameters can be determined to the required length. Keywords: fl uidized bed dryer, heat and mass transfer, volumetric heat transfer coeffi cient, mathematical model

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Heat and Mass Transfer in Agitated, Co-, or Countercurrent Conductive–Convective Heated Drum Dryer

Cited by 23 publications

References 14 publications

Measurement testing of heat transfer coefficients in the evaporator and condenser of heat pumps

Measurement testing of heat transfer coefficients in the evaporator and condenser of heat pumps

Thermal Dewatering of Waste Sludge in an Agitated Drum Dryer

Determination of entry length of a fluidized bed dryer using volumetric heat transfer coefficient

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