TY - JOUR
T1 - Calorimetric measurements of the dynamics of a finned adsorbent:
T2 - early assessment of the activated carbon cloth - ethanol pair with prismatic aluminium fins
AU - Tierney, Michael
AU - Ketteringham, Laurence
AU - Selwyn, Becky
AU - Saidani-Scott, Hind
PY - 2016/1/25
Y1 - 2016/1/25
N2 - The heat of adsorption of the pair ethanol
-
activated carbon cloth (ACC) has been measured in a specialised calorimeter, following a step change in vapour pressure (the "large pressure jump", LPJ
) or a step change in temperature of the fin base
(the “large temperature jump”, LTJ). This is the first time that LTJ has been attempted with this particular technique. The ACC was incorporated into a set of fins, representing small sections of finned tube adsorbent bed (~50 gram mass)
and
with a fin-to-fin gap of 6 mm. The heat rejection fitted an exponential decay, and for purposes of data fitting was adequately described by exponential
decay, notwithstanding
multiple physical effects within the ACC pack. Characteristic times, τ,
were established for LPJ and LTJ. The characteristic times
were adjusted to allow for sensible heat of the sample,
making them indicative of change in
refrigerant
uptake and cooling power.
For instance,
for the LTJ
338 K →
303 K the
characteristic time was 146s
without adjustment, but 183s
with adjustment. For the fins tested under LTJ, an “average” specific cooling power, defined with cycle time = 1.6 τ, was in the
range
of 0.36 to 0.52 kW kg-1, somewhat smaller than seen elsewhere and requiring
future
optimization of the finned sample
.
AB - The heat of adsorption of the pair ethanol
-
activated carbon cloth (ACC) has been measured in a specialised calorimeter, following a step change in vapour pressure (the "large pressure jump", LPJ
) or a step change in temperature of the fin base
(the “large temperature jump”, LTJ). This is the first time that LTJ has been attempted with this particular technique. The ACC was incorporated into a set of fins, representing small sections of finned tube adsorbent bed (~50 gram mass)
and
with a fin-to-fin gap of 6 mm. The heat rejection fitted an exponential decay, and for purposes of data fitting was adequately described by exponential
decay, notwithstanding
multiple physical effects within the ACC pack. Characteristic times, τ,
were established for LPJ and LTJ. The characteristic times
were adjusted to allow for sensible heat of the sample,
making them indicative of change in
refrigerant
uptake and cooling power.
For instance,
for the LTJ
338 K →
303 K the
characteristic time was 146s
without adjustment, but 183s
with adjustment. For the fins tested under LTJ, an “average” specific cooling power, defined with cycle time = 1.6 τ, was in the
range
of 0.36 to 0.52 kW kg-1, somewhat smaller than seen elsewhere and requiring
future
optimization of the finned sample
.
KW - AHP
KW - calorimetry
KW - activated carbon cloth
U2 - 10.1016/j.applthermaleng.2015.10.009
DO - 10.1016/j.applthermaleng.2015.10.009
M3 - Article (Academic Journal)
SN - 1359-4311
VL - 93
SP - 1264
EP - 1272
JO - Applied Thermal Engineering
JF - Applied Thermal Engineering
ER -