Re: [EnergyPlus_Support] Question: Calculate Curves of VRF Fluid Temperature Control

["Jim Dirkes jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

This information is not readily available from most manufacturers! With a lot of prodding, you may be able to get it, though I have found it difficult.

If you obtain manufacturer data, you can normally derive curves using the Excel LINEST function. Alternatively, E+ has a method of deriving the curves from raw data using the Table: objects

Apart from manufacturer data, the curves used in most example files are reasonable to use.

On Wed, Aug 16, 2017 at 4:55 AM, cheonguy@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 

Hello, I'm modelling VRF Fluid Temperature Control using Energyplus 8.7.

I have to input some curves to describe real equipment.

Which data should I use to calculate coefficient of curve and how can I calculate ?

Please explain the calculation detail process.

Thank you for your answer :)

===================================================================

Class: AirConditioner:VariableRefrigerantFlow:FluidTemperatureControl

-  Outdoor Unit Evaporating Temperature Function of Superheating Curve Name

-  Outdoor Unit Condensing Temperature Function of Subcooling Curve Name

-  Defrost Energy Input Ratio Modifier Function of Temperature Curve Name

 

Class: Coil:Cooling:DX:VariableRefrigerantFlow:FluidTemperatureControl

-  Indoor Unit Evaporating Temperature Function of Superheating Curve Name

 

Class: Coil:Heating:DX:VariableRefrigerantFlow:FluidTemperatureControl

-  Indoor Unit Condensing Temperature Function of Subcooling Curve Name

 

--

James V Dirkes II, CEO / President
The Building Performance Team Inc.
1631 Acacia Dr, GR, MI 49504

(alphabet soup of efforts for greater understanding: PE, BEMP, BCxP, LEED AP)

Direct / Mobile: 616.450.8653
jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx

Website l  LinkedIn

Coffee conversation:
What spirit is so empty and blind, that it cannot recognize the fact that the foot is more noble than the shoe, and skin more beautiful than the garment with which it is clothed?

__._,_.___

---

Posted by: Jim Dirkes <jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx>

---

EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The EnergyPlus web site is found at:
http://www.energyplus.net/

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.

Visit Your Group

• New Members 9

• Privacy • Unsubscribe • Terms of Use

__,_._,___