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Research Papers: Heat and Mass Transfer

Investigation of Plate Falling Film Absorber With Film-Inverting Configuration

[+] Author and Article Information
X.-Y. Cui

Institute of Thermal Engineering, University of Shanghai for Science and Technology, Shanghai 200093, Chinaxiaoyu_cui@usst.edu.cn

J.-Z. Shi, C. Tan, Z.-P. Xu

Institute of Thermal Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

J. Heat Transfer 131(7), 072001 (May 01, 2009) (9 pages) doi:10.1115/1.3089550 History: Received March 25, 2008; Revised December 17, 2008; Published May 01, 2009

The performance enhancement of absorbers is closely related to the investment costs of absorption cooling systems. In this paper, a new film-inverting design for plate falling film absorber is proposed. The absorber consists of consecutive inclined plates. The absorbent solution is distributed at the top of the first plate and forms a liquid film falling down along the plate. Meanwhile, the falling film absorbs the water vapor generated by the evaporator. At the bottom of this plate, the film is guided to the next one and at the same time the film is inverted and its inner side to the vapor is exposed. In this way, the absorption process can be enhanced. A mathematical model is developed for the simulation of heat and mass transfer in this new type of absorbers and is solved numerically. The experiments were carried out under different conditions and the influences of absorption pressure, solution flow rate, solution inlet temperature, and cooling water on the absorption process were investigated experimentally. Comparisons show a good consistency between the experiment and numerical results.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 8

Effect of film flow rate on absorption characteristics (cin=0.60, p=1020 Pa, Tin=44.7°C, Gw=0.020 kg/s): (a) convection heat transfer coefficient and (b) absorption rate

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Figure 9

Effect of solution inlet temperature on absorption characteristics (Re=50.3, cin=0.60, p=1020 Pa, Gw=0.017kg/s): (a) convection heat transfer coefficient and (b) sbsorption rate

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Figure 10

Effect of cooling conditions on absorption characteristics (Re=56.9, cin=0.592, Tin=38.7 °C, p=1020 Pa, Gw=0.017 kg/s): (a) convection heat transfer coefficient and (b) absorption rate versus plate wall temperature

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Figure 11

Temperature and concentration distribution of different film section for vertical plate falling film absorber: (a) temperature distribution, (b) concentration distribution, (c) T distribution of different film sections, and (d) C distribution of different film section

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Figure 12

Interface temperature and concentration with and without film inversion

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Figure 13

Absorption rate with and without film inversion

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Figure 14

Temperature and concentration distribution on the second plate with film inverted

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Figure 15

Outlet mean temperature and concentration versus first and second plate angles for configuration with film inversion, 0.3 m each for the first and second plates. (a) outlet mean concentration and (b) outlet mean temperature

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Figure 16

Outlet mean temperature versus film-inverting times

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Figure 17

Outlet mean concentration versus film-inverting times

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Figure 1

Schematic of the tubular falling film with the film-inverting configuration

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Figure 2

Schematic of the plate falling film absorber with the film-inverting configuration

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Figure 3

Falling film absorption process

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Figure 4

Film-inverting configuration in experimental absorber

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Figure 5

The schematic of the experimental setup

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Figure 6

Experiment setup

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Figure 7

The effect of absorption pressure on absorption characteristics (Re=59.3, cin=0.606, Tin=41.5°C, Gw=0.018kg/s): (a) convection heat transfer coefficient and (b) absorption rate

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Figure 18

Outlet concentration mean changes with first plate length

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Figure 19

Outlet temperature mean changes with first plate length

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