From: david brady
Subject: Re: [WanderlodgeForum] Re: Sound- absorption or reflection
To: WanderlodgeForum@yahoogroups.com
Date: Sunday, February 22, 2009, 8:39 AM

I pulled this out of the Powertech manual: (for what it's worth),

"Each engine is equipped with a high water temperature shutdown
switch, which will automatically shut down the set if the operating
temperature climbs too high. To prevent the generator set from
shutting down make sure the compartment openings are large enough
to allow adequate circulation of cooling air. The minimum free air
opening in the compartment door is 400 sq. in. or 2580 sq. cm.
Remember that louvers, screens and protective grills will restrict airflow.
A relatively open mesh screen will restrict airflow as much as 45%.
The intake opening must be increased to compensate for
such restrictions. "

David
'02 LXi, NC


Kurt Horvath wrote:

I would say that careful inspections are the order of the day to keep
your coach in top form and you safe.

I'm not up to snuff on this post but in my case the new exhaust,
exhaust blankets on the new Stainless pipes (18ga.) and a soon to be
installed thermal and acoustic insulation in the engine compartment
she'll be cool, quite and efficient The blankets and the SS pipes are
rated at over 2000 degrees continuous duty. So the hottest parts are
insulated and the hottest gasses are directed out and away from the
motor. I did install 2 - 1650 cfm electric fans in the engine
compartment, to take care of any other residual heating problems.
I don't see how insulating any Bird compartment would be detrimental.
I can't imagine any engineer using the coach in any calculation as a
heat sink, to dissipate any heat from the engine or generator

Isn't that what radiators and exhausts are
for.?

I'll redo the insulation in the genny compartment when I do the main
engine area.

Look at any Prevost conversion the generators are mostly in enclosed
compartments, Birds , at least the PT series are completely open
underneath. I would not worry about maximum insulation in the genny
box. When driving you get air flow, when parked the blower is sucking
air in from some where, some is air is flowing through the genny
box , along with the manifold, exhaust and valve cover blankets it's
already retaining/containin g a lot of heat internally that can only
be removed through the exhaust and radiator. If after insulating you
see higher temps. Install a lower temp. thermostat.

After my near miss at burning up my coach I'd like to ask the forum a
question.

Has anybody ever checked the condition of the Generator exhaust stack
that goes up through the body? And how would we go about
checking it?
It has the potential to be a serious issue should it be leaking
exhaust fumes into the coach.

In my coach the Genny Stack is located next to the Fridge. How well
insulated is it? Maybe that's why my Fridge works great when parked
but doesn't when I'm driving. I almost always run the generator when
driving, and yes it's running while parked if not at a place it can
be plugged in to. So is it part of my Fridge cooling problem? Maybe,
any thoughts?

Kurt Horvath
95 PT 42
10AC

--- In "WanderlodgeForum%40yahoogroups.com", "timvasqz" wrote:
>
> Not too far fetched. My cummins engine computer is cooled with
> diesel fuel. I am just curious where you were transfering heat to
> with your 'insulation heat dissipation remanufacture redesign'
>
> heat is
transfered and lost to other objects. for one thing to
lose
> heat somthing else must take it. its a calorie calc. when you
> insulate to keep heat from the interior of the bus where does that
> heat now go?
>
> some times when an interior gets hot and calls for modification it
> is an overlooked sign that the heat producer has other issues
causing
> excessive heat. KurtH can atest. in a genset the genhead may be
> cooking or engine exhaust is screwed up.
>
> Greg ofTim&Greg
> 94ptca
>
>
>
> "WanderlodgeForum%40yahoogroups.com", "Stephen Birtles"
> wrote:
> >
> > why thank you for the mindless dribble another useless comment
> >
> > Stephen 77fc35
> >
> >
> > --- In "WanderlodgeForum%40yahoogroups.com", "timvasqz" > wrote:
> > >
> > > To disipate heat, is to transfer it. Steve maybe you can
disapate
> it
> > > thru a dupree valve back to the tank? Call it Hot$$$$ ?
> > >
> > > I understand that the vault gets up to +250 degrees(USA) . I
> guess
> > > that is a factor for Ernie to consider once he removed the
> disipation
> > > path of the vault heat to the bus interior. where does that
> heat
> > > now go.
> > >
> > > Insulation keeps environments from disapating heat. heat is
> removed
> > > so the method to remove the heat in the compartment would now
be
> the
> > > radiator system and the diesel engine is the
heat sink, but
the
> > > diesel engine caused most of the heat. If the origional design
> was
> > > not intended to do that it would have to be beefed up
> > >
> > > If you insulate the exhaust the otherwise exposed metal does
not
> > > radiate heat in the compartment. heat goes out the stack with
the
> > > exhast air. But is the stack able to take all the extra heat.
> > >
> > > If someone complains to me about the noise my genset is making
I
> > > say "What? can't hear you, my genset is too loud".
> > > GregofTim&Greg
> > > 94ptCa
> > >
> > >
> > >
> > > In "WanderlodgeForum%40yahoogroups.com", "Stephen Birtles"
>
> >
> wrote:
> > > >
> > > > We will look into re manufacturing or redesigning a similar
> product
> > > > that will work as sound absorption as well as heat
dissipation
> > > > It will take some time to get a satisfactory product.
> > > > Stephen 77fc35
> > > >
> > > >
> > > > --- In "WanderlodgeForum%40yahoogroups.com", "Ernest Ekberg"
> > > > wrote:
> > > > >
> > > > > After installing many generator compartments with the new
> > > insulation, I
> > > > > was wondering if there is a manufacturer that offers both.
> > > > > I insulated Bob Lawrences' generator compartment last
> December.
> > > He

> > > > > measured the db levels before and after and found that
while
> the
> > > heat
> > > > > was reflected from the interior of the coach, the sound was
> also
> > > > > deflected to the outside. thus his db levels INCREASED to
> over
> > > 90.
> > > > > I know my with my coach, that I have been asked to park way
> > > downwind as
> > > > > my generator is really loud. Maybe its the dogs I carry
with
> me???
> > > > > But, if there is a product that will absorb that sound
while
> > > reflecting
> > > > > the heat, let's talk about it.
> > > > > Ernie-83PT40 in Texas, buying earplugs by the case~
> > > > >
> > > >
> > >
> >
>

---

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