[TRNSYS-users] question on TYPE 676 (Steam-Fired Double-Effect Absorption Chiller)

[Jeff Thornton]

This is the exact method employed by a major absorption chiller 
manufacturer to characterize the performance of their machines over a 
wide range of operating conditions.

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 at tess-inc.com


On 06/14/2012 1:47 am, Lei Wang wrote:
> Dear All,
>
> I have a question on Type 676. According to the help documents,  the
> energy delivered to the chiller by the steam source is calculated
> using equation 676.4
> Qsteam=(Capacity_rated/COP_rated)*F_designEnergyInput.
>
> The F_designEnergyInput is the value returned by the thrid call to
> Dynamic Data and is the value specified in the S3 data file. It only
> is the function of cooling water temperature and the fraction of
> design load, which is calcuated by equation 676.3 .
> f_DesignLoad=Q_remove/Capacity_rated
>
>
>  The energy consumption calculation is only based on the fraction of
> design load, cooling water temperature and don't consider chilled
> water outlet temperature. The chilled outlet temperature is only used
> for calculating Capacity (specified in the S2 file).
>
>  In my opinion, I don't think this model can calculate the energy
> consumption correctly, when the chilled water supply temperature is
> reset.
>
> Thanks
>
> Lei Wang
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at cae.wisc.edu
> https://mailman.cae.wisc.edu/listinfo/trnsys-users