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

[Lei Wang <leiwang@tees.tamus.edu>]

Hi, Jeff

I still feel confuse on S3 data file.  The fraction of design energy input is only  the function of cooling water temperature and the fraction load. What's the condition of chilled water temperature. 

Thanks

Lei

-----Original Message-----
From: Jeff Thornton [mailto:thornton@tess-inc.com] 
Sent: Thursday, June 14, 2012 12:54 PM
To: trnsys-users@cae.wisc.edu
Subject: Re: [TRNSYS-users] question on TYPE 676 (Steam-Fired Double-Effect Absorption Chiller)

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@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
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