Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Energy optimization in ice hockey halls I. The system COP as a
  multivariable function, brine and design choices   This work is the first in a series of articles addressing the energy
optimization in ice hockey halls. Here we adopt an analytical method, called
functional optimization, to find which design and operating conditions maximize
the Coefficient Of Performance of the entire cooling system (brine pumps and
cooling tower), which we call ${\rm COP}_{sys}$. This is addressed as a
function of several variables, like electric consumption and brine physical
properties. By maximizing such function, the best configuration and brine
choices for the system can thus be determined accurately and rigorously. We
investigate the importance of pipe diameter, depth and brine type (ethylene
glycol and ammonia) for average-sized ice rinks. An optimal brine density is
found, and we compute the weight of the electric consumption of the brine pumps
on ${\rm COP}_{sys}$. Our formulas are validated with heat flow measurement
data obtained at an ice hockey hall in Finland. They are also confronted with
technical and cost-related constraints, and implemented by simulations with the
program COMSOL Multiphysics. The multivariable approach here discussed is
general, and can be applied to the rigorous preliminary study of diverse
situations in building physics and in many other areas of interest.

33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat