Direct contact condensation in packed beds

Li, Yang; Klausner, James F.; Mei, Renwei; Knight, J. R.

doi:10.1016/j.ijheatmasstransfer.2006.06.013

Cited by 48 publications

(34 citation statements)

References 17 publications

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“…Many experimental and theoretical works have been performed on steam-water direct contact condensation in the packed column. [4][5][6][7] Bharathan et al [4] developed a one-dimensional, steady-state model that captures the heat, mass, and momentum processes of steam-water direct contact condensation in the presence of non-condensable gases. Huang and Fair [5] performed a reasonable method to use the mass transfer data to predict the heat transfer coefficients with the heat/mass transfer analogy, depending on type of packed bed and flow rates.…”

Section: Irect Contact Condensation Occurs When Vapour Condensesmentioning

confidence: 99%

“…Based on the conclusions above, the steam is mainly condensed in the initial period of experiments. Therefore, the experimental data within time constant are used to calculate the volumetric heat transfer coefficient through Equations (4)(5)(6)(7)(8). That is, the steam temperature T s,j is the average value of the four temperature measuring points (T 1 ; T 2 ; T 3 ; T 4 ) at t ¼ time constant.…”

Section: Heat Transfer Parametersmentioning

confidence: 99%

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Transient analysis of the steam‐water direct contact condensation in the packed column

Huang

Cui

2017

Can J Chem Eng

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The transient heat transfer behaviour of direct contact condensation of steam in spray cooling water in a packed column was investigated experimentally and theoretically in this work for the first time. A new analysis method of the state equation was applied to analyze the molar quantity variation of steam in the course of the experiment. The results showed that increasing the cooling water flow rate properly could significantly accelerate the steam condensation rate and this was more obvious at the beginning of the operation. The higher the flow rate of the cooling water was, the shorter a time it took for the steam to be completely condensed. When the cooling water flow rate was 840 L/h, the steam was mainly condensed within 13 s, which indicated that it would rapidly handle steam by regulating cooling water flow rate. However, the effect of changing cooling water temperature on steam condensation rate is slight with the cooling water temperature inceasing from 23 8C to 42 8C. The volumetric heat transfer coefficient in this experiment is in the range of 1.47 kW Á m À3 Á K À1 to 10.93 kW Á m À3 Á K À1 with the cooling water flow rate inceasing from 120 L/h to 840 L/h, and the maximum uncertainty in the results is 2.2 %.

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Section: Irect Contact Condensation Occurs When Vapour Condensesmentioning

confidence: 99%

Section: Heat Transfer Parametersmentioning

confidence: 99%

Transient analysis of the steam‐water direct contact condensation in the packed column

Huang

Cui

2017

Can J Chem Eng

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“…Two types of desalination units SME 3.6 (50 L/d) and SME 200 had been in operation in Sfax (Tunisia) since 1991 Experimental study on these units performed by Ben Bacha had deliberated a condensate production of 4 L/m²d with a collector efficiency of 46% (theoretical production: 14. longitudinal fins was used in one study [59], while a stack of plates with copper tubes mounted on them in another study ([60] & [61]) used a horizontal falling film-type condenser. Direct contact heat exchangers were also used as a condenser in some other studies [62] [63]). In a pilot plant built in Malaysia, the dehumidifier was made of a long copper galvanized steel tube (3 m length, 170 mm diameter) with 10 longitudinal fins of 50 mm height on the outer tube surface and 9 fins on the inner side.…”

Section: IImentioning

confidence: 99%

Review of Dehumidifier with Association to Solar Circular Collector for Close Water Open Air System (CWOA) Humidification & Dehumidification Process

Patel¹

2017

IJAERS

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“…At the top of the dehumidifier, the hot humid air is forced down where the distilled water is recovered. It is important to note that heat recovery in an HDH system requires a larger heat transfer area for improving the overall system Packed bed direct contact heat exchangers were used in a few researchers ( [52], [64] & [65]), because the film condensation heat transfer is tremendously degraded in the presence of non-condensable gas. An additional shell and tube heat exchanger is used to cool the desalinated water from which a portion is re-circulated and sprayed in the condenser.…”

Section: Dehumidifiersmentioning

confidence: 99%

The potential of solar-driven humidification–dehumidification desalination for small-scale decentralized water production

Narayan

Sharqawy

Summers

et al. 2010

Renewable and Sustainable Energy Reviews

364

132

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World-wide water scarcity, especially in the developing world, indicates a pressing need to develop inexpensive, decentralized small-scale desalination technologies which use renewable resources of energy. This paper provides a comprehensive review of the stateof-the-art in one of the most promising of these technologies, solar-driven humidification-dehumidification (HDH) desalination. Previous studies have investigated many different variations on the HDH cycle. In this paper, performance parameters which enable comparison of the various versions of the HDH cycle have been defined and evaluated. To better compare these cycles, each has been represented in psychometric coordinates. The principal components of the HDH system are also reviewed and compared, including the humidifier, solar heaters, and dehumidifiers. Particular attention is given to solar air heaters, for which design data is limited; and direct air heating is compared to direct water heating in the cycle assessments. Alternative processes based on the HDH concept are also reviewed and compared. Further, novel proposals for improvement of the HDH cycle are outlined. It is concluded that HDH technology has great promise for decentralized small-scale water production applications, although additional research and development is needed for improving system efficiency and reducing capital cost.

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Direct contact condensation in packed beds

Cited by 48 publications

References 17 publications

Transient analysis of the steam‐water direct contact condensation in the packed column

Transient analysis of the steam‐water direct contact condensation in the packed column

Review of Dehumidifier with Association to Solar Circular Collector for Close Water Open Air System (CWOA) Humidification & Dehumidification Process

The potential of solar-driven humidification–dehumidification desalination for small-scale decentralized water production

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