Aqua-Hot 450 D, Руководство пользователя

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© 2011 Aqua-Hot
®
450-D Hydronic Heating System Owner’s Manual
A
PPENDIX
C: A
NTIFREEZE
T
ERMS AND
M
IXTURE
R
ATIO
Boiling Point:
The Aqua-Hot utilizes the propylene glycol based (PPG)
antifreeze and water heating solution as a transportation
means for the heat produced from the internal proc-
esses. The PPG antifreeze solution absorbs the heat
created until its boiling point is reached; it is at this point
that the liquid turns to a gas and is expelled to prevent
the heating system from overheating. Each time the boil-
ing point is reached, a loss of efficiency occurs because
the heat produced is expelled rather than utilized for the
function of the heating system. Therefore, a higher boil-
ing point is desired in order to combat the loss of effi-
ciency, which allows the antifreeze to transport the heat
created from the internal process throughout the mo-
torhome where it can be utilized productively rather than
dissipating due to its change from a liquid to a gas.
Rust and Anti-Corrosive Inhibitors:
Another major function of antifreeze solution is to provide
protection to the internal metal components of the Aqua-
Hot hydronic heating system from corrosion and rust.
Antifreeze is able to perform this function by the addition
of rust and anti-corrosive inhibitors, which are designed
specifically to activate in a water solution.
Summary:
Antifreeze solution has three basic functions: freeze
protection, boil-over protection, and anti-corrosion and
rust protection.
PPG Antifreeze solution is also primarily responsible for
heat transfer; however, propylene glycol itself does not
possess acceptable heat transfer characteristics. There-
fore, water is added to the mixture because it is an ex-
cellent heat conductor. PPG antifreeze solution, mixed
with water, that is 35% to 50% propylene glycol is rec-
ommended to provide the best performance combination
of the aforementioned functions. If excess propylene
glycol exists within an antifreeze and water heating solu-
tion, the water’s heat absorption properties are compro-
mised, which could ultimately inhibit the Aqua-Hot from
providing adequate domestic hot water and interior heat-
ing.
Additionally, if the antifreeze and water heating solution
contains over 70 percent propylene glycol, the freezing
point is actually raised, resulting in less freeze protec-
tion. Please reference the attached graphical represen-
tation regarding the percentage of antifreeze to water
and how it directly affects the solution’s freezing point.