Home Page link

Dew Point Calculation in a Gas Mixture

Home| Search | About
Login Password
Register Now! Lost Password?

HVAC Discussions - Heating, ventilation and air conditioning. 

Page 3 of 7       < 1 2 3 > last >> Bookmark this page:  YahooMyWeb Yahoo!  Google Google  Windows Live Favorites Windows Live  del.icio.us del.icio.us  digg digg  Add to Netscape Netscape
Subject Author Date
Dew Point Calculation in a Gas Mixture fac 03-19-2008
If you were  Registered and logged in, you could reply and use other advanced thread options
Posted by Zyp on March 22, 2008, 3:29 pm
-zero wrote:
>> -zero wrote:
>>>> I have a heated mixture of:
>>>> O2: 12%
>>>> H2O: 13%
>>>> N2: 70%
>>>> CO2: 5%
>>>>
>>>>
>>>> Temperature: is around 200ēC.
>>>>
>>>> Somebody is asking me about the dew point. I know how to calculate
>>>> the dew point if it were H2O in air (using psicometric ASHRAE
>>>> diagrams) but I am not
>>>> able to calculate it in this mixture.
>>>
>>> That would be a flue-gas mixture, not a fuel-gas mixture. It will
>>> condense according to the environment the flue is discharged into.
>>> To keep it from condensing inside the pipe, insulate the pipe
>>> to keep it above 250° Fahrenheit.
>>>
>>> -zero
>>
>> Well there ya go... see, I didn't see the writing on the wall :)
>
> Well,,, sniffing too much flue gas will do that to ya. ;o)
>
>
>> Zyp

ROFL

--
Zyp



Posted by on March 22, 2008, 4:32 pm

>-zero wrote:
>>> -zero wrote:
>>>>> I have a heated mixture of:
>>>>> O2: 12%
>>>>> H2O: 13%
>>>>> N2: 70%
>>>>> CO2: 5%
>>>>>
>>>>>
>>>>> Temperature: is around 200ēC.
>>>>>
>>>>> Somebody is asking me about the dew point. I know how to calculate
>>>>> the dew point if it were H2O in air (using psicometric ASHRAE
>>>>> diagrams) but I am not
>>>>> able to calculate it in this mixture.
>>>>
>>>> That would be a flue-gas mixture, not a fuel-gas mixture. It will
>>>> condense according to the environment the flue is discharged into.
>>>> To keep it from condensing inside the pipe, insulate the pipe
>>>> to keep it above 250° Fahrenheit.
>>>>
>>>> -zero
>>>
>>> Well there ya go... see, I didn't see the writing on the wall :)
>>
>> Well,,, sniffing too much flue gas will do that to ya. ;o)
>>
>>
>>> Zyp
>
>ROFL

        Well, don't sit around and fume about it !


--
Click here every day to feed an animal that needs you today !!!
http://www.theanimalrescuesite.com/

Paul ( pjm @ pobox . com ) - remove spaces to email me
'Some days, it's just not worth chewing through the restraints.'
'With sufficient thrust, pigs fly just fine.'
HVAC/R program for Palm PDA's
Free demo now available online http://pmilligan.net/palm/

Posted by fac on March 21, 2008, 2:15 pm
Do you know if there is any standar to calculate this. The composition will
not remain always the same, so the dew point should change


Thanks

>
> >I have a heated mixture of:
> > O2: 12%
> > H2O: 13%
> > N2: 70%
> > CO2: 5%
> >
> >
> > Temperature: is around 200ēC.
> >
> > Somebody is asking me about the dew point. I know how to calculate the
dew
> > point if it were H2O in air (using psicometric ASHRAE diagrams) but I am
> > not
> > able to calculate it in this mixture.
>
> That would be a flue-gas mixture, not a fuel-gas mixture. It will
> condense according to the environment the flue is discharged into.
> To keep it from condensing inside the pipe, insulate the pipe
> to keep it above 250° Fahrenheit.
>
> -zero
>
>



Posted by -zero on March 21, 2008, 6:38 pm

> Do you know if there is any standar to calculate this. The composition
> will
> not remain always the same, so the dew point should change

You may want to start here;
http://www.jehar.com/dewpnt.htm

This will calculate the fuel dewpoint based upon the sulfur content, and
will very according to burner, fuel type and combustion air used.
However, your numbers look more like sampling from a Kiln or Process
Dryer. That involves variable moisture from the process interacting with
burner
firing rate. It can be VERY complicated to calculate in advance.
You can monitor that in real time if you must, but why you would want
to, I have no idea.

Why DO you need this information?

-zero








Posted by Noon-Air on March 21, 2008, 7:12 pm

>
>> Do you know if there is any standar to calculate this. The composition
>> will
>> not remain always the same, so the dew point should change
>
> You may want to start here;
> http://www.jehar.com/dewpnt.htm
>
> This will calculate the fuel dewpoint based upon the sulfur content, and
> will very according to burner, fuel type and combustion air used.
> However, your numbers look more like sampling from a Kiln or Process
> Dryer. That involves variable moisture from the process interacting with
> burner
> firing rate. It can be VERY complicated to calculate in advance.
> You can monitor that in real time if you must, but why you would want
> to, I have no idea.
>
> Why DO you need this information?


He wants you to do his homework for him :-)


Page 3 of 7       < 1 2 3 > last >>
Similar ThreadsPosted
control valve sizing calculation November 30, 2007, 10:03 pm
Heat Pump vs Fossil Fuel - Crossover point spreadsheet - 1 attachment January 19, 2008, 10:35 am

Contact Us | Privacy Policy

XML SitemapXML Sitemap