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Re: [EnergyPlus_Support] Re: Cooling Part-Load of VRF System
The Cooling Part-Load Fraction Correlation is used to account for
cycling losses when the system compressor cycles on and off. Look at the
Figure 11 lower left corner blue dashed line. This is where this curve
is used.
On 10/24/2012 10:16 PM, soohyeunyang wrote:
> Thank you very much for your help!
>
> I have a question one more.
> I am examining the 'Creating Performance Curves for Variable Refrigerant Flow Heat Pumps in EnergyPlus'you write.
> I think start up curve is explained in the 'Cooling Part-Load Fraction Correlation Curve'section, isn't it?
> Do you mean application of 'Cooling Part-Load Fraction Correlation Curve'is not yet impossible?
> I apply this curve, but there is no change at initial part.
> Pleas give me a answer.
> Thank you.
>
>
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad <RRaustad@...> wrote:
>> Start up curves are not included in the VRF model. There is a start up
>> delay in the VRF heat recovery model (when switching from heat pump to
>> heat recovery), but this has not been included in the original heat pump
>> model.
>>
>> On 10/23/2012 12:16 PM, soohyeunyang wrote:
>>> I have modeled the VRF System using E+(version 7.0)
>>> When a compressor turns on, the capacity provided does not immediately increase to the desired capacity. There is some time required to reach the steady-state capacity. So, indoor temperature falls slowly in the initial stages in cooling mode.
>>> How can i the characteristic above mentioned realize in E+?
>>>
>>>
>>>
>>> ------------------------------------
>>>
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>> --
>> Richard A. Raustad
>> Senior Research Engineer
>> Florida Solar Energy Center
>> University of Central Florida
>> 1679 Clearlake Road
>> Cocoa, FL 32922-5703
>> Phone: (321) 638-1454
>> Fax: (321) 638-1439 or 1010
>> Visit our web site at: http://www.fsec.ucf.edu
>>
>> UCF - From Promise to Prominence: Celebrating 40 Years
>>
>
>
>
> ------------------------------------
>
> Primary EnergyPlus support is found at:
> http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
>
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
>
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
>
> Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files.
>
> EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
> Yahoo! Groups Links
>
>
>
>
--
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL 32922-5703
Phone: (321) 638-1454
Fax: (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu
UCF - From Promise to Prominence: Celebrating 40 Years
------------------------------------
Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
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