Paulo Jose Schiavon Ara wrote:
>
> Thank you Kasirajan and thank you Richard,
>
> I understand now but I have only one more question ...
>
> When I obtain the Part Load Efficiency Curves (performance curves) for
> my absorption chiller from manufacturers, I have the values of
> COP =f(PLR) .
>
> However, E+ consider the Generator Heat Input Part Load Ratio Curves
> which relates values of SteamInputRatio = f( PLR) according to page
> 537 of I/O Reference.
>
> So in order to fit the curve using Biquadratic Curve Fit I have to
> have values of SteamInputRatio which I/O Ref defines as "the Ratio of
> the Generator load on the absorber to the demand on the chiller".
>
> How can I obtain these values using Part Load Efficiency Curves from
> manufacturers?
You will curve fit the normalized steam input (steam input divided by
rated steam input) to the chiller PLR (or chiller output divided by
rated chiller capacity)
>
> Maybe, SteamInputRatio is related with COP, and I've imagined that
> SteamInputRatio is =(COP)^-1, but the value of optimum PLR (which
> corresponds to maximum COP) doesn't match with minimum SteamInputRatio
> of the Example file Absorption chiller performance curve.
>
I am not sure of your question. The optimum PLR will probably not match
the minimum PLR, and may not match the optimum PLR in the example file.
The example file is just meant to show you how to hook up the chiller
and familiarize you with the input requirements.
> Do you have an idea about this?
>
> If I can relate SteamInputRatio with COP I could obtain the curve and
> coefficients asked by E+.
The steam input ratio is not correlated to COP, it's correlated to
capacity (cooling output divided by rated cooling output)
>
> thanks in advance.
> Paulo Ara.
>
>
>
> *De:* Kasirajan <kasidude@yahoo. co.in>
> *Para:* "EnergyPlus_ Support@yahoogro ups.com" <EnergyPlus_Support@
> yahoogroups. com>
> *Cc:* "EnergyPlus_ Support@yahoogro ups.com" <EnergyPlus_Support@
> yahoogroups. com>
> *Enviadas:* Quinta-feira, 28 de Janeiro de 2010 12:18:53
> *Assunto:* Re: [EnergyPlus_ Support] Absorption Chiller data for
> EnergyPlus
>
>
>
> Hi Paula,
>
> I you can request for the NPLV OR IPLV which is the part load
> performance. This generally provided by the supplier.
>
> Kasirajan. K
> Sent from my iPhone
>
> On 28-Jan-2010, at 21:21, Paulo Jose Schiavon Ara <paulo_ara@yahoo.
> com.br <mailto:paulo_ara@xxxxxxxxxxxx>> wrote:
>
>>
>> Hello,
>>
>> I'm trying to define the absorption chiller for my simulation other
>> them the absorption chiller presented in the example file.
>>
>> When looking for the chiller parameters among the absorption chillers
>> catalogs, I'm not finding the parameters needed for EnergyPlus
>> simulation such as Part Load Ratio (Minimum, Maximum and Optimum),
>> Generator Steam Input Curve, etc.
>>
>> I would like to know if is it possible to find this data
>> in other sources or if is there a way to estimate these parameters by
>> myself based on the data about COP, temperatures and flow rate which
>> I can obtain from catalogs.
>>
>> Thank you very much,
>> Paulo Ara.
>>
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