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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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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