Re: [TRNSYS-users] type 907

[Jeff Thornton <thornton@tess-inc.com>]

Federica,

The exhaust heat is as you defined it, the amount of energy that is 
released from the device in the form of energy in the exhaust stream.  
The "Rejected to Atmosphere" term are all of the miscellaneous losses 
from the device; convection and radiation from the shell of the device 
being foremost.

Jeff

---
Jeff Thornton
President - TESS LLC
22 N. Carroll Street, Madison WI USA 53703
Office: (608) 274-2577  Fax: (608) 278-1475
www.tess-inc.com
E-Mail: thornton@tess-inc.com


On 08/19/2018 12:15 pm, Federica Azzarri S238292 via TRNSYS-users wrote:
> Hi TRNSYS users,
>
> I need to use type 907 to simulate an Internal Combustion (IC) engine.
> I'm having some problems in the implementation of the efficiency map
> as an external file to this type. I already saw the example
> IC_Engine_Sample_Spreadsheet.xls, but I don't understand the values I
> must insert in the cells regarding two columns: 'Exhaust Heat' and
> 'Rejected to Atmosphere'. Is 'Exhaust Heat' the value calculated as
> the exhaust flow rate multiplied by the specific heat of the exhaust
> gas and by the difference between the exit temperature of the exhaust
> gas and the intake air temperature?
> What about the value I must insert as 'Rejected to Atmosphere'?
>
> Moreover I noticed that all the values required in the efficiency map
> refer to a certain air intake temperature and that in the examples it
> is specified more than one intake air temperature inside of the map.
> The datasheet of my IC engine refers to only one value of air intake
> temperature, is it possible to use just one value?
>
> Thanks in advance to anyone will try to help me,
> Federica.
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