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Optimization of an “Adsorbent/Heat Exchanger” Unit

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Dynamics of Adsorptive Systems for Heat Transformation

Part of the book series: SpringerBriefs in Applied Sciences and Technology ((BRIEFSAPPLSCIENCES))

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Abstract

Despite significant progress, the AHT technology as yet remains unfinished and expensive, so that there is still a big room for its improvement [1, 2]. This concerns, first of all, enhancement of the AHT dynamics, like the ad/desorption rate and finally the specific power that is the main figure of merit of the AHT dynamic performance. Therefore, further R&D activity is necessary to realize the potential economic and ecological advantages of the AHT technology [3]. The optimization of the AHT dynamic performance is a multi-purpose task that includes, first of all, the improvement of the “adsorbent–heat exchanger” unit.

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Abbreviations

AC:

Adsorptive Chiller

Ad-HEx:

Adsorbent Heat Exchanger

AHT:

Adsorptive Heat Transformer

C :

Gas/vapour molar density, mol m−3

COP :

Coefficient of Performance

d :

Grain’s diameter, mm

D:

Diffusivity, m2 s−1

LTJ:

Large Temperature Jump method

V-LTJ:

Volumetric Version of Large Temperature Jump method

HEx:

Heat Exchanger

J :

Heat flux, W

L :

Adsorbent layer thickness, mm; HEx length, m

m :

Dry adsorbent mass, kg

M :

HEx’s mass, kg

N :

Moles of air molecules

P :

Pressure, Pa

R :

Grain radius, mm; adsorption-to-desorption time ratio, s/s; universal gas constant, J mol−1 K

S :

HEx heat transfer surface area, m2

SCP :

Specific Cooling Power, W kg−1

SP :

Specific Power

T :

Temperature, K

TD :

Temperature Driven

t :

Time, s; cycle time, s

U :

Overall heat transfer coefficient, W m−2 K−1

v :

Velocity of the convective flux, m s−1

V :

HEx’s volume, dm3; volumetric flow rate, dm3 min−1

VCP :

Volumetric Cooling Power, W/dm3

w :

Water uptake, g g−1; HEx’s width

W :

Specific cooling power, W kg−1

z :

Coordinate in the direction perpendicular to the flat adsorbent bed, m

ρ :

Adsorbent layer density, kg m−3

τ:

Characteristic time, s

0:

Initial stage

a:

Air

ads:

Adsorbent/adsorption

Con:

Condensation

conv:

Convective

des:

Desorption

dif:

Diffusional

ev:

Evaporation

f:

Fin

H:

High

L:

Low

M:

Medium

min:

Minimal

mt:

Mass transfer

reg:

Regeneration

v:

Vapour

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Authors and Affiliations

  1. Consiglio Nazionale delle Ricerche, Messina, Italy

    Alessio Sapienza

  2. Consiglio Nazionale delle Ricerche, Messina, Italy

    Andrea Frazzica

  3. Consiglio Nazionale delle Ricerche, Messina, Italy

    Angelo Freni

  4. Boreskov Institute of Catalysis, Novosibirsk, Russia

    Yuri Aristov

Authors
  1. Alessio Sapienza
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  2. Andrea Frazzica
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  3. Angelo Freni
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  4. Yuri Aristov
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Correspondence to Alessio Sapienza .

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Sapienza, A., Frazzica, A., Freni, A., Aristov, Y. (2018). Optimization of an “Adsorbent/Heat Exchanger” Unit. In: Dynamics of Adsorptive Systems for Heat Transformation. SpringerBriefs in Applied Sciences and Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-51287-7_4

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  • DOI: https://doi.org/10.1007/978-3-319-51287-7_4

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-51285-3

  • Online ISBN: 978-3-319-51287-7

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