1,727 research outputs found
The Performance Matching of Inverter Room Air Conditioner
Some key parameter like suction superheat, compressor frequency, indoor and outdoor air volume, have been explored using simulation tools for the performance matching of the inverter room air conditioner. It was found that the all above parameters can be further optimized in every matching condition (including intermediate cooling, rated cooling, maximum cooling, middle heating and rated heating, etc.). The optimum range for all above parameter has been found and can be used in the variable frequency control module to ensure optimal overall performance of the system
Wigner solution of the quark gap equation
Solutions and their evolutions of the quark gap equation are studied within
the Nambu-Jona--Lasinio model, which is a basic issue for studying the QCD
phase structure and locating the possible critical end point. It is shown that
in the chiral limit case of the vacuum, chiral symmetry will hold if the
coupling strength is small, then the system only has the Wigner solution at
. If increasing , two symmetric minima will appear as the positive and
`negative' Nambu solutions, however, the solution now corresponds to a
maximum instead of a minimum of the thermodynamical potential, so is not a
physically stable state anymore (we call it `pseudo-Wigner solution'). Besides,
it is shown that as the current quark mass increases, the pseudo-Wigner
solution will become negative, and disappear together with the negative Nambu
solution if is large enough. Similar things happen if we increase the
temperature or quark chemical potential . Some interesting phenomenon is,
from some a second local minimum will show up. As increases
gradually, it will be stabler than the Nambu solution, survives even the Nambu
solution disappears, and approaches , which are just the features of the
Wigner solution we expect.Comment: version accepted for publication in the European Physical Journal
- …