<VV> Re: [VV-talk] turbos

[airvair]

AeroNed@aol.com wrote:

>In a message dated 1/15/2005 10:21:01 AM Central Standard Time,  
>airvair@richnet.net writes:
> 
> 
>>From  what I understand about turbos, they become most effective when 
>placed  closest to the heat source. 
>
> 
>In a message dated 1/15/2005 7:58:15 PM Central Standard Time,  
>sheridanma@adelphia.net writes:
>
>This  heat thing driving turbos is something I never understood. Why does 
>hot  air drive them better than cool air? I would think that pressure is  
>pressure, but obviously I am wrong.
>
>
>Ah,  discussing science on VV-Talk. Hank is missing all the fun....
> 
>The first comment from Mark, is totally correct for two reasons. If the  
>turbo is close to the heat source the flow into the turbo will be hotter which  is 
>a good thing. Also there will be less losses in pressure due to the  exhaust 
>flow traveling through the exhaust pipes.
> 
>The second comment from Marc is really a question and a comment. The reason  
>hot air is better and pressure isn't pressure can be found in the perfect gas  
>law, pV=nRT. In english that says that the pressure times volume is equal to 
>a  constant (nR) times the temperature. If we are considering a fixed geometry 
> system, the cold air system is the same size as the hot air system, the the  
>volumes are equal. Then the pressure increases as temperature increases.
> 
>Ned
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