Analytical solution and experimental measurements for temperature distribution prediction of three-phase direct-contact condenser

Mahood, Hameed B.; Sharif, Adel O.; Al-aibi, Sami; Hawkins, Daniel M.; Thorpe, Rex B.

doi:10.1016/j.energy.2013.12.026

Cited by 25 publications

(26 citation statements)

References 17 publications

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“…Due to immiscibility between the two phases, neither the dispersed phase nor the continuous phase goes into solution in the other phase, therefore, the change of mass of each phase with time can be assumed constant [19,23,24]. Therefore, Eqs.…”

Section: Modellingmentioning

confidence: 99%

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Experimental measurements and theoretical prediction for the transient characteristic of a two-phase two-component direct contact condenser

Mahood

Thorpe

Campbell

et al. 2015

Applied Thermal Engineering

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Section: Modellingmentioning

confidence: 99%

“…More recently, Mahood et al [19] have investigated the steady state axial temperature distribution of a three-phase direct contact condenser, both experimentally and analytically. A high mass flow rate ratio was found to result in a high condenser output.…”

Section: Introductionmentioning

confidence: 99%

Experimental measurements and theoretical prediction for the transient characteristic of a two-phase two-component direct contact condenser

Mahood

Thorpe

Campbell

et al. 2015

Applied Thermal Engineering

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“…Figures 2, 3 and 4 show the variation of the volumetric heat transfer coefficient, with time, for different mass flow rate ratios and at a constant dispersed phase initial temperature. A sharp decline of Uv is noted after a short time from the start of the column operation, where the maximum Uv value is recorded and this then dropped to a nearly constant value at t = 100 s. This might result from the intensive condensation during the beginning of vapour injection, where the driving temperature force is at its maximum; consequently a lot of heat is absorbed by the continuous phase, which has been confirmed previously [17,18].…”

Section: Resultsmentioning

confidence: 60%

“…• Both continuous phase and dispersed phase mass flow rates are assumed constant along the column. This can be made reasonably acceptable by means of a constant holdup ratio along the column height which has been demonstrated for both direct contact evaporator [22][23][24] and direct contact condenser [17,18]. • The heat losses from the direct contact column to the environment are ignored.…”

Section: Resultsmentioning

confidence: 97%

“…However, the recovering energy from such processes and other thermal downstream processes might be enhanced by utilising the direct contact condenser. Accordingly, author and others have carried out a series of investigations regarding the three-phase direct contact condenser [16][17][18]. The characteristics of the threephase direct contact condenser as well as the effect of different parameters have been investigated and discussed.…”

Section: Introductionmentioning

confidence: 98%

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Transient volumetric heat transfer coefficient prediction of a three-phase direct contact condenser

2014

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An experimental investigation for the time dependent volumetric heat transfer coefficient of the bubbles type, three-phase direct contact condenser has been carried out utilising a short column (70 cm in total height and 4 cm inner diameter). A 47 cm active height was chosen with five different mass flow rate ratios and three different initial dispersed phase temperatures. Vapour pentane and constant temperature tap water as dispersed and continuous phases were implemented. The results showed that the volumetric heat transfer coefficient decreases with increased time until it almost reaches its steady state conditions. A sharp decrease in the volumetric heat transfer coefficient was found at the beginning of the operation and, diminished over a short time interval. Furthermore, a positive effect of the mass flow rate ratios on the volumetric heat transfer coefficient was noted and this was more pronounced at the beginning of the operation. On the other hand, the volumetric heat transfer coefficient decreased with an increase in the continuous phase mass flow rate and there was no considerable effect of the initial dispersed phase temperatures, which confirms that latent heat transfer is dominant in the process. List of symbolsA Cross-section area (m 2 ) C pc Specific heat of continuous phase (kJ/kg°C) hfg Latent heat of condensation (kJ/kg) _ m Mass flow rate (kg/s) Q Heat transfer rate (kW) t Time (s) T Temperature (°C) u Velocity (m/s) V Column volume (m 3 ) Z Axial height (m)Greek symbols q Density (kg/m 3 ) D Difference (-)

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The effect of packing on direct contact evaporation in spray column

Jin

Huang

et al. 2017

Can J Chem Eng

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The direct contact evaporation in countercurrent spray column has been experimentally investigated. Two kinds of random packing were added into the column independently to study their influence on heat transfer process. Three different continuous phase flow rates (150, 200, 250 L/h) and two different dispersed flow rates (6.565, 13.13 L/h) were used in the experiment. The inlet continuous phase temperature ranged from 42 to 57 °C, and the inlet dispersed phase temperature was near its boiling point. The effect of variable factors on the optimal column height, the volumetric heat transfer coefficient, the pressure drop, and the thickness of foam layer were studied. The results showed that packing had positive effects on heat transfer, such as decreasing the optimal column height and the thickness of foam layer, increasing heat transfer coefficient. But extra pressure was also obvious. Dixon rings performed better than Raschig rings in the experiments due to their finer structure.

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Analytical solution and experimental measurements for temperature distribution prediction of three-phase direct-contact condenser

Cited by 25 publications

References 17 publications

Experimental measurements and theoretical prediction for the transient characteristic of a two-phase two-component direct contact condenser

Experimental measurements and theoretical prediction for the transient characteristic of a two-phase two-component direct contact condenser

Transient volumetric heat transfer coefficient prediction of a three-phase direct contact condenser

The effect of packing on direct contact evaporation in spray column

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