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RE: [EnergyPlus_Support] Detailed ICE storage - for PCMs? Nodes & curves question

I have tried running your IDF, but do not know what you are trying to do.
GJ  is GigaJoules.
I do not know why you have so many designDay objects.  Only two are needed for sizing.  Four, if you are trying the four season solar beam study, and/or the transistion operation of the HVAC system..
Where do you intend to insert the storage tank?  The pipe object itself is not in the correct order postion of the IDF, therefore the branch was not recognized and flagged as a severe error.
If you want to discharge the tank load in a zone, then it should be declared as a zone equipment, or a tank placed in a zone.
I do not know how you can charge an ICE STORAGE TANK.  Is it a new object available in EPlus?  This is the first time I come across the ThermalStorage:Ice:Detailed.  I shall try to look it up in the ref. manuals.
You should use a refrigerated room and control its temperature for the experiment.  The PCM may be installed as the walls of the centrol zone with the four other peripheral zones as in the 5-zone building as controlled zones.
Without the ice strage branch, the IDF run was sucessfull.
 Dr. Li  


To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: jeremiah@xxxxxxxxxxxxxxxxxxxxxx
Date: Wed, 18 Jul 2012 20:20:22 -0700
Subject: [EnergyPlus_Support] Detailed ICE storage - for PCMs? Nodes & curves question

I am attempting to experiment with the detailed Ice storage object, as I noticed it has "freezing temperature of storage medium" rather than assuming freezing temp for water of 0C/32F. I added the objects from the example file to to a model I have been working on and attempted to connect the nodes, but when trying to run E+ crashes. Also I was thinking to use data from DSC tests of PCM for the charge and discharge curves, but am not sure how to approach it. (I am guessing 1=solid and 0= melt, but am unsure), also I wanted to use the thickness of PCM for the volume of the storage tank, but am unsure about the GJ, what unit would this be? Any advise would be great, and thanks in advance- 

Below is the copy paste's from the IDF..

Name Ice Tank
Availability Schedule Name ON
Capacity 0.5
Inlet Node Name Ice Tank Inlet Node
Outlet Node Name Ice Tank Outlet Node
Discharging Curve Object Type QuadraticLinear
Discharging Curve Name DischargeCurve
Charging Curve Object Type QuadraticLinear
Charging Curve Name ChargeCurve
Timestep of the Curve Data 1
Parasitic Electric Load During Discharging 0.0001
Parasitic Electric Load During Charging 0.0002
Tank Loss Coefficient 0.0003
Freezing Temperature of Storage Medium 23
Name DischargeCurve ChargeCurve
Coefficient1 Constant 0 0
Coefficient2 x 0.09 0.09
Coefficient3 x**2 -0.15 -0.15
Coefficient4 y 0.612 0.612
Coefficient5 x*y -0.324 -0.324
Coefficient6 x**2*y -0.216 -0.216
Minimum Value of x 0 0
Maximum Value of x 1 1
Minimum Value of y 0 0
Maximum Value of y 9.9 9.9
Minimum Curve Output
Name Cooling Supply Outlet
Maximum Flow Rate 0
Pressure Drop Curve Name
Component 1 Object Type ThermalStorage:Ice:Detailed
Component 1 Name Ice Tank
Component 1 Inlet Node Name Ice Tank Inlet Node
Component 1 Outlet Node Name Ice Tank Outlet Node
Component 1 Branch Control Type PASSIVE
Component 2 Object Type Pipe:Adiabatic
Component 2 Name Supply Side Outlet Pipe
Component 2 Inlet Node Name Ice Tank Outlet Node
Component 2 Outlet Node Name CW Supply Outlet Node
Component 2 Branch Control Type PASSIVE
Component 3 Object Type
Component 3 Name
Component 3 Inlet Node Name

Jeremiah D. Crossett
CleanTech Analytics

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