RE: [EnergyPlus_Support] Chiller Branch Issue

Run the example file: 5ZoneDetailedIceStorage.idf

Because this program connects the ice tank in seriese with the chiller loop, it does not need an extra loop for the ice tank.

Glycol i sued to lower the temperature to -5°c when the chiller is on like to charge the ice tank. The ice would form on the chiller coil in the ice tank. When it is not charged, the ice melts, as the water temperature is raised to the normal chiller operation.

If you can fill the tank with ice, the storage capacity is increased 80 time. Because the water ice transition has simple relation, it is rather simple to simulate.

What is the working temperature of the thermaSTIX. Simply drop them into the ICE tank and set the freezing temperature. Ice volume is calculated from the heat extracted from the tank.

Actually, you simply increase the water tank size to that multiplied by the latent heat, the operating characteristic would be similar. Cool the water to say 1°C during idle time and run the chiller at 1°C to 7°C with the compressor OFF, and then continue to run would be the same as freezing water into ICE and then melting it.

If the stix can freeze at 1°C and melt at 1°C, it is behaving just like water/ice. If you can freeze it at 1°C and melt at 30°C with a trigger, then it can be carrid around like the gel pack.

If it will freeze at 25°C and melt at the same or higher temperature, then it can be used to store night cooling

Dr. Li

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: jcrossett@xxxxxxxxxxxxxxx
Date: Fri, 10 Aug 2012 13:09:57 -0700
Subject: [EnergyPlus_Support] Chiller Branch Issue

I finally seem to have gotten the ice storage object to work but now it says my chiller is missing- When attempting to re-connect the chiller in any logical way I can think of I get fatal errors saying that I have duplicate node names. I put the day into this yesterday, read documentation and ran experiments and seem to have not gotten the detailed ice storage object to work- but in the process have apparently disconnected my chiller. Can anyone help? Dr Li, your previous advise was over complicated I see not reason to make a refrigerated room when the goal is to cold charge a PCM in the night to use it in the day to pre-cool input for a chiller for a non refrigerated space.

** Severe ** Plant Component Chiller:Electric:EIR called "CHILLER" was not found on any plant loops.

** ~~~ ** Looking for matching inlet Node="ICE TANK OUTLET".
** Fatal ** InitElectricEIRChiller: Program terminated due to previous condition(s).

...Summary of Errors that led to program termination:
..... Reference severe error count=1

..... Last severe error=Plant Component Chiller:Electric:EIR called "CHILLER" was not found on any plant loops.

This project in particular is to use BioPCM Thermastix, (see image below) in a container to absorb cold and use it for chiller pre-cooling- basically as a replacement for ice in an ice storage type setup- seems perfect for Energy Plus Ice Storage Detailed object as it allows the "ice" to melt at a user specified temperature, and as manufactures we can make our PCM-ICE to melt at any temperature-- but the question is what temperature and how much to use, both questions it would be great if Energy Plus could answer- if only I could get the object to work.. I have been trying on and off for days- so any help would be appreciated.

Jeremiah D. Crossett | Senior Analyst | Phase Change Energy Solutions

120 E. Pritchard St. | Asheboro, NC 27203 | Mobile 503-688-8951

www.phasechange.com

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