Experimental determination of correlations for average heat transfer coefficients in heat exchangers on both fluid sides

Taler, Dawid

doi:10.1007/s00231-013-1148-5

Cited by 62 publications

(43 citation statements)

References 21 publications

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“…The area averaged wall temperature is given by: The values of the average heat transfer coefficients h avg , CFD are listed in Table 1. The computations were carried out for the mean water temperatures w T = 65 ºC (case no 1-9) and w T = 30 ºC (case no [10][11][12][13][14][15][16][17][18] to demonstrate that the influence of the tube wall temperature on the determined air side heat transfer coefficients is insignificant. The maximum relative difference between the heat transfer coefficients for w T = 30 ºC and w T = 65 ºC does not exceed 2.9 %.…”

Section: Air-sidementioning

confidence: 99%

“…The experimental-numerical method for determining the average heat transfer coefficient for the air flow h a was described in details in refferences [7,10]. Moreover, in reference [10], the detailed list of measurement points, used in this work, is given.…”

Section: Comparison Of the Nusselt Number Correlations Determined Expmentioning

confidence: 99%

“…Moreover, in reference [10], the detailed list of measurement points, used in this work, is given. The experimental-numerical method is based on the performance tests of a car radiator (see Fig.…”

Section: Comparison Of the Nusselt Number Correlations Determined Expmentioning

confidence: 99%

“…These correlations involves the criteria number definition (Nu a , Re a , Pr a and Nu w , Re w , and Pr w ) given in [10].…”

Section: Comparison Of the Nusselt Number Correlations Determined Expmentioning

confidence: 99%

“…The performance of the fin-and-tube heat exchangers and their components has been widely studied in the literature [5][6][7][8][9][10][11][12][13][14][15]. The issues undertaken during the design procedure for these devices are: the efficiency analysis of heat transfer process, the determination of the average heat transfer coefficients for the fluids flowing in the tubular and the inter-tubular spaces of the heat exchangers, the analysis of flow distribution inside the tubular and inter-tubular space of the heat exchanger, the determination of the thermal contact resistance between the fin and the tube and the structural analysis of these devices.…”

Section: Introductionmentioning

confidence: 99%

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Numerical determination of the gas-side average heat transfer coefficients in the fin-and-tube heat exchanger

Taler¹,

Ocłoń²

2014

ZN PRz Mechanika

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This paper presents the numerical method for the determination of the average heat transfer coefficient in fin-and-tube heat exchanger. The air side Nusselt number formulas are determined via the CFD simulation based method. The path of the gas flow across the inter-tubular space of this heat exchanger is complex, therefore the CFD simulations are used to determine the velocity distributions and the temperature field of air. The results of the numerical computations are compared with the Nusselt number formula based on the experimental data, which were obtained during the test of the car radiator. Good agreement between the numerical results and the results based on the measurements is achieved.

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Section: Air-sidementioning

confidence: 99%

Section: Comparison Of the Nusselt Number Correlations Determined Expmentioning

confidence: 99%

Section: Comparison Of the Nusselt Number Correlations Determined Expmentioning

confidence: 99%

“…These correlations involves the criteria number definition (Nu a , Re a , Pr a and Nu w , Re w , and Pr w ) given in [10].…”

Section: Comparison Of the Nusselt Number Correlations Determined Expmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical determination of the gas-side average heat transfer coefficients in the fin-and-tube heat exchanger

Taler¹,

Ocłoń²

2014

ZN PRz Mechanika

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On Direct Injection of Supercritical Water into Spark Ignition Engines as a Strategy for Heat Recovery

2021

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A novel heat recovery strategy for internal combustion engines is proposed. The aim is to recover thermal energy from the engine exhaust gases and through cylinder walls to heat pressurized water to supercritical conditions and to directly inject such supercritical water into the combustion chamber. Herein, this strategy is applied to a spark ignition, four‐stroke, port fuel injection engine. An in‐house solver, which includes a heat exchanger model, has been developed to conduct numerical simulations of the apparatus. At first, the engine model has been validated by comparing the results with experimental measurements. Then, a parametric analysis has been conducted to maximize the engine efficiency by varying the injection start timing, the injector diameter, and the water/fuel ratio. A single‐objective genetic algorithm has been used to select the optimal set of such parameters. Finally, a multiobjective genetic algorithm has been used to maximize the engine efficiency and minimize the exhaust gas–water heat exchanger size. The results show that the proposed approach may lead to a significant increase in the engine efficiency, up to about 12%.

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The fouling in the tubular heat exchanger of Algiers refinery

2015

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List of symbols AThe heat transfer external surface (m 2 ) a ⊥ , a c⊥ The fluid passage area at side tube and side calender, respectively (m 2 ) C P The heat-storage capacity (kJ/kg °C) C Pf , Cp c The heat-storage capacity (kJ/kg °C) d The fluid circulating density at side tube di Tubes interns diameter (m) d 0,e Diamètre externe des tubes (m) d 4 15 Density D c , D e Diamètre de la calandre et diamètre hydraulique, respectivement (m) f t The friction factor F The correction factor G t The mass speed fluid circulating at side tube (kg/h m 2 ) h i The heat transfer coefficient at internal film (kW/m 2 °C) h 0 The heat transfer coefficient at external film (kW/m 2 °C) h i0 The heat transfer coefficient at internal film brought back to the external surface (kW/ m 2 °C) J hf , J hc Coefficient de transfert pour le fluide froid et chaud, respectivement (kW/m 2 °C) l Tubes length (m) m The cold fluid mass flow (the crude oil) (m 3 /h) m f , m c Débit massique pour le fluide froid et chaud, respectivement (kg/s) m f⊥ , m c⊥ Mass flow for the cold and hot fluid, respectively, concerning the straight section (kg/s) MLDTThe difference logarithmic temperature (°C) n c , n tThe devices and the master keys numbers P e , P s Inlet and outlet pressure of the crude oil respectively (Pascal)Abstract Crude oil fouling in refinery preheat exchangers is a chronic operational problem that compromises energy recovery in these systems. Progress is hindered by the lack of quantitative knowledge of the dynamic effects of fouling on heat exchanger transfer and pressure drops. In subject of this work is an experimental determination of the thermal fouling resistance in the tubular heat exchanger of the crude oil preheats trains installed in an Algiers refinery. By measuring the inlet and outlet temperatures and mass flows of the two fluids, the overall heat transfer coefficient has been determined. Determining the overall heat transfer coefficient for the heat exchanger with clean and fouled surfaces, the fouling resistance was calculated. The results obtained from the two cells of exchangers studies, showed that the fouling resistance increased with time presented an exponential evolution in agreement with the model suggested by Kern and Seaton, with the existence of fluctuation caused by the instability of the flow rate and the impact between the particles. The bad cleaning of the heat exchangers involved the absence of the induction period and caused consequently, high values of the fouling resistance in a relatively short period of time.

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Experimental determination of correlations for average heat transfer coefficients in heat exchangers on both fluid sides

Cited by 62 publications

References 21 publications

Numerical determination of the gas-side average heat transfer coefficients in the fin-and-tube heat exchanger

Numerical determination of the gas-side average heat transfer coefficients in the fin-and-tube heat exchanger

On Direct Injection of Supercritical Water into Spark Ignition Engines as a Strategy for Heat Recovery

The fouling in the tubular heat exchanger of Algiers refinery

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