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

[jeannieboef]

In an ASHRAE journal article I recently read, the author showed that  
chilled water outlet temp has almost no effect on chiller efficiency.  
If you what I can find the article and tell you in which issue it is.

Sent from my iPhone

On 14.06.2012, at 19:53, Jeff Thornton <thornton at tess-inc.com> wrote:

> 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
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>
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