Research output: Contribution to journal › Article › peer-review
Dynamics of pressure- and temperature-initiated adsorption cycles for transformation of low temperature heat: Flat bed of loose grains. / Girnik, I. S.; Okunev, B. N.; Aristov, Yu I.
In: Applied Thermal Engineering, Vol. 165, 114654, 25.01.2020.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Dynamics of pressure- and temperature-initiated adsorption cycles for transformation of low temperature heat: Flat bed of loose grains
AU - Girnik, I. S.
AU - Okunev, B. N.
AU - Aristov, Yu I.
PY - 2020/1/25
Y1 - 2020/1/25
N2 - Despite significant progress made in adsorption heat transformation, still, there is a big room for it's further improving. This work addresses the dynamic study of methanol adsorption and comparison of two ways of the process initiation. The traditional way is due to fast temperature change (TI), and the less studied one is by quick pressure variation (PI). The appropriate temperature/pressure variations were selected similar to those in a new cycle “Heat from Cold” recently suggested for upgrading the ambient heat in cold countries. An activated carbon ACM-35.4, used as a methanol adsorbent, was located on metal support as a thin flat bed of loose grains. For a monolayer bed configuration, the dynamics is almost identical for the two initiation ways. Both TI and PI kinetic curves are exponential with a characteristic time, which depends on the process boundary conditions rather than the initiation mode. The mathematical model of methanol adsorption on a single spherical carbon grain is developed to explain these results. The perceptible difference is found for the multi-layer configuration of the carbon bed. The PI adsorption dynamics is faster than the TI one at short adsorption time and equal to it at long time. A possible reason for this difference is discussed.
AB - Despite significant progress made in adsorption heat transformation, still, there is a big room for it's further improving. This work addresses the dynamic study of methanol adsorption and comparison of two ways of the process initiation. The traditional way is due to fast temperature change (TI), and the less studied one is by quick pressure variation (PI). The appropriate temperature/pressure variations were selected similar to those in a new cycle “Heat from Cold” recently suggested for upgrading the ambient heat in cold countries. An activated carbon ACM-35.4, used as a methanol adsorbent, was located on metal support as a thin flat bed of loose grains. For a monolayer bed configuration, the dynamics is almost identical for the two initiation ways. Both TI and PI kinetic curves are exponential with a characteristic time, which depends on the process boundary conditions rather than the initiation mode. The mathematical model of methanol adsorption on a single spherical carbon grain is developed to explain these results. The perceptible difference is found for the multi-layer configuration of the carbon bed. The PI adsorption dynamics is faster than the TI one at short adsorption time and equal to it at long time. A possible reason for this difference is discussed.
KW - Activated carbon
KW - Adsorptive heat transformation
KW - Driving force
KW - Methanol
KW - PUMPS
KW - SORPTION
KW - ADSORBENT
KW - DRIVEN
KW - PAIRS
UR - http://www.scopus.com/inward/record.url?scp=85075357187&partnerID=8YFLogxK
U2 - 10.1016/j.applthermaleng.2019.114654
DO - 10.1016/j.applthermaleng.2019.114654
M3 - Article
AN - SCOPUS:85075357187
VL - 165
JO - Applied Thermal Engineering
JF - Applied Thermal Engineering
SN - 1359-4311
M1 - 114654
ER -
ID: 22406117