An approach to fouling allowances in the design of compact heat exchangers

Hesselgreaves, John E.

doi:10.1016/s1359-4311(02)00033-9

Cited by 23 publications

(17 citation statements)

References 4 publications

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“…The standard deviation increases with an increasing fouling resistance for the 12-channel microstructure. The observed asymptotic fouling values of the microscale heat exchangers are lower by a factor of 10 compared to shell-and-tube heat exchangers at macroscale [14]. However, the fouling resistance is in the same range (10 5 -10 4 m 2 K W 1 ) of a compact heat exchanger, such as plate heat exchangers [14].…”

Section: Discussionmentioning

confidence: 92%

“…The observed asymptotic fouling values of the microscale heat exchangers are lower by a factor of 10 compared to shell-and-tube heat exchangers at macroscale [14]. However, the fouling resistance is in the same range (10 5 -10 4 m 2 K W 1 ) of a compact heat exchanger, such as plate heat exchangers [14]. Due to the relatively high heat flux in a micro heat exchanger, the surface temperatures are comparable to macroscale heat exchangers.…”

Section: Discussionmentioning

confidence: 95%

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Crystallization Fouling in Experimental Micro Heat Exchangers—Optical and Thermal Investigations

Mayer¹,

Bucko²,

Benzinger³

et al. 2013

Experimental Heat Transfer

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The intention of this work is the basic investigations of the fouling behavior in micro heat exchangers. Therefore fouling experiments with calcium carbonate (CaCO 3 ) in an experimental micro heat exchanger were carried out and observed with a digital microscope. The investigations included local temperature measurements confirmed by computational fluid dynamics simulation as well as optical visualization of the fouling process inside the microchannels. The detected fouling resistances R f were in the range of 10 5 -10 4 m 2 K W 1 . Cleaning in place was possible and also optically observed.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 95%

Crystallization Fouling in Experimental Micro Heat Exchangers—Optical and Thermal Investigations

Mayer¹,

Bucko²,

Benzinger³

et al. 2013

Experimental Heat Transfer

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“…Typically in PHEs, according to Ref. [17], the fouling factors are in the order of 0.1 m 2 K/kW. This is the value selected for the present calculation.…”

Section: Description Of the Systemmentioning

confidence: 99%

Performance of a LiBr–water absorption chiller operating with plate heat exchangers

Vega

Almendros-Ibáñez

Ruiz³

2006

Energy Conversion and Management

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This paper studies the performance of a lithium bromide water absorption chiller operating with plate heat exchangers (PHE). The overall heat transfer coefficients in the desorber, the condenser and the solution heat recoverer are calculated using the correlations provided in the literature for evaporation, condensation and liquid to liquid heat transfer in PHEs. The variable parameters are the external driving temperatures. In the desorber, the inlet temperature of the hot fluid ranges from 75°C to 105°C. In the condenser and the absorber, the inlet temperature of the cooling water goes from 20°C to 40°C. The coefficient of performance (COP) obtained ranges from 0.5 to 0.8 for cooling duties ranging from 2 kW to 12 kW. The chiller response to different hot fluid temperatures and circulated mass flow rates is also presented. The per formance and the internal parameters of the chiller at part load are, therefore, calculated. A higher efficiency results when the solution pumped from the absorber to the desorber decreases. The heat transfer analysis of the PHEs is also presented. The overall heat transfer coefficient in the desorber, equal to 790 W/m 2 K at the design conditions, is also analysed at part load. The condenser performance can be represented by a similar relationship found in conventional air cooled condensers.

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“…An approach to fouling allowances in the design of compact heat exchangers was discussed. [4] An approximate method for transient behavior of finned tubes cross flow heat exchangers was discussed. [6] .…”

Section: Introductionmentioning

confidence: 99%

Simulation Studies on A Cross Flow Plate Fin Heat Exchanger

Thirumarimurugan¹,

Kannadasan²,

Ramasamy³

2008

American J. of Applied Sciences

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Abstract:Compact heat exchangers which were initially developed for the aerospace industries in the 1940s have been considerably improved in the past few years. The main reasons for the good performance of compact heat exchangers are their special design which includes turbulent which in turn use high heat transfer coefficient and resists fouling, and maximum temperature driving force between the hot and cold fluids. Numerous types use special enhancement techniques to achieve the required heat transfer in smaller plot areas and, in many cases, less initial investment. One such type of compact heat exchanger is the Plate-fin heat exchanger. The complexity of compact heat exchanger design equations results from the exchangers unique ability to transfer heat between multiple process streams and a wide array of possible flow configurations. This paper presents the performance evaluation of cross flow plate fin heat exchanger with several different Gas-Liquid systems. Experimental results such as exchanger effectiveness, overall heat transfer coefficients were calculated for the flow systems of Cross flow Heat Exchangers. A steady state model for the outlet temperature of both the cold and hot fluid and overall heat transfer coefficient of a plate-fin cross flow heat exchanger was developed and simulated using MATLAB, which was verified with the experiments conducted.

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An approach to fouling allowances in the design of compact heat exchangers

Cited by 23 publications

References 4 publications

Crystallization Fouling in Experimental Micro Heat Exchangers—Optical and Thermal Investigations

Crystallization Fouling in Experimental Micro Heat Exchangers—Optical and Thermal Investigations

Performance of a LiBr–water absorption chiller operating with plate heat exchangers

Simulation Studies on A Cross Flow Plate Fin Heat Exchanger

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