Sound- absorption or reflection

[david brady]

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/containing 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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