Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Efficiency estimation for an equilibrium version of Maxwell refrigerator   Maxwell refrigerator as a device that can transfer heat from a cold to hot
temperature reservoir making use of information reservoir was introduced by
Mandal et al. \cite{Mandal2013a}. The model has a two state demon and a bit
stream interacting with two thermal reservoirs simultaneously. We work out a
simpler version of the refrigerator where the demon and bit system interact
with the reservoirs separately and for a duration long enough to establish
equilibrium. The efficiency, $\eta$, of the device when working as an engine as
well as the coefficient of performance (COP) when working as a refrigerator are
calculated. It is shown that the maximum efficiency matches that of a Carnot
engine/refrigerator working between the same temperatures, as expected. The COP
at maximum power decreases as $\frac{1}{T_h}$ when $T_h >T_c \gg \Delta E$
($k_B = 1$), where $T_h$ and $T_c$ are the temperatures of the hot and cold
reservoirs respectively and $\Delta E$ is the level spacing of the demon.
$\eta$ at maximum power of the device, when working as a heat engine, is found
to be $\frac{T_h}{0.779 + T_h}$ when $T_c \ll \Delta E$ and $T_h \gg \Delta E$.

12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph