Crafton wrote: It takes cold air below dew point for moisture to
accumulate. To elaborate further,only on a rainy day is RH near
100%. In a room at 100% RH, water will condense on any surface below
room temp. Water will also evaporate from a surface or container at a
temperature higher than room temperature. To thoroughly analize how
water could accumulate in the exhaust manifold, can you provide: room
air RH & temp, inlet comb air RH & temp, exhaust pipe temp
We need to know how the surface temperature of the hot exhaust could
fall below dew point. If you are boiling water to increase the RH,
the savings are counterproductive because water takes more energy to
heat than does air. Expensive is the Energy lost by leakage of moist
100% RH room air to the outside. Leakage or loss of dry 50% RH room
air to the outside is low cost. See www.msnusers.com/cornstoves for a
thorough analysis of heat loss due to dew point.
> How do you have the intake air configured? Is a damper used to
> the intake air? Have you measured the exhaust temp and also the
> inlet air temp? What is the room RH relative humidity and how does
> vary with room temp? Get the local dealer to heip you. The rust
> problem will continue unless the root cause is determined.
> --- In firstname.lastname@example.org, Daniel Wood <woody19582002@>
> > Myself and the three other parties who have contacted me all use
> inside air for combustion.
> > My secondary and a friends are being returned next week for
> warranty replacement. His rusted out in one season. Afriend up
> is going through an attorney to get her money refunded.
> > P.S. The same message was posted on another website, I received
> > Take Care
> > Cornstoves <haclift@> wrote:
> > Woody, Woody, Would he, do it if I told him how? First
> off use room
> > combustion air rather than cold outside air. Stove efficiency
> > improve. Room air is not cold enough to condense moisture in the
> > exhaust manifold and corrode the contents. At least install a
> > drain on the exhaust manifold if you persist for some unknown
> reason to
> > bring super cold outside air into the combustion chamber to kill
> > flames. The room combustion air concept sucks contaminated room
> > into the combustion chamber, burns it, and sends bad room air
> > outside. Room air will gradually become clean air rather than
> > accumulation of house cleaning chemicals, insulation and carpet
> > outgasses. Cigarette smoke, airborne dog smell, and cooking odors
> > exhausted for free. In Minnesota, Michigan and Ohio, the Cold
> > air is below dew point of the corn stove exhaust. Water condenses
> > inside the exhaust manifold, collects, and should be periodically
> > removed. Install a manual ball valve drain for convenient routine
> > drain. Excessive water collection in the exhaust manifold WILL
> > intefere with proper combustion air flow and reduce corn stove
> > efficiency. Water condensation is not a concern in warm climates
> > Tn, Ms, Mo, Ok, Va, WVa, NC, SC, Al, Ga). If inside room air is
> > for combustion air the exhaust manifold will remain well above
> > dew point. Any periodic vapours, gasses, or liquids passing
> > exhaust will evaporate and exhaust rather than collect.
> > carbon particulate will continue to collect.
> > Install a large 2" ball valve out the bottom of the manifold for
> > liquid drain. With a 2" ball valve full open, a vacuum cleaner
> > can be used to easily remove solid carbon particulate from the
> > manifold. The increased combustion air flow will decrease the
> > accumulation rate of carbon particulate.
> > --- In email@example.com, "woody19582002"
> > wrote:
> > >
> > > Is anyone out there having rust thru on their secondary heat
> > exchangers?
> > > I have had to patch my tubes once and the bottom of the chamber
> > > in 2 years. I have sand blasted and used high heat paint on the
> > > but it burns off in a couple of weeks. Any info would be much
> > > appreciated.
> > > Thanks from Michigan
> > >
> > ---------------------------------
> > Ahhh...imagining that irresistible "new car" smell?
> > Check outnew cars at Yahoo! Autos.