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Cooling Supply with dual compressor chiller and ice thermal storage

asked 2020-06-09 09:29:03 -0500

szsz gravatar image

updated 2020-06-09 20:51:43 -0500

I am now trying to modeling a cooling plant which served by dual compressor chiller and ice thermal storage.
Dual compressor chiller can charge ice storage during night-time and supply the chilled ethylene glycol during day-time when cooling demand is larger than ice storage capacity.
Below is simple line diagram of the system.
image description Here is my questions:

  1. Does EnergyPlus have duel compressor chiller component?
    I cannot find a chiller object which has dual compressor.
    Should I model two chiller objects which have different design condition instead of one dual compressor chiller?
  2. How to model a parallel supply loop?
    The system may supply chilled ethylene glycol from both ice storage and chiller during day-time and it requires two connector in supply loop which is not available in Energyplus.
    Should I model chiller supply loop and ice storage supply loop independently with fluid-to-fluid heat exchanger which doesn't existing in real design? If yes, as the supply loop is designed with only one set of pumps, how to properly model the pump in the added supply loop?
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answered 2020-06-23 03:05:10 -0500

sergerwehbe gravatar image

updated 2020-06-23 03:10:03 -0500

I faced the same issue, I did my design using two separate chillers, (A) one for ice storage and (B) one for cooling during the day/night.

for the indoor units I did the same, an indoor unit system for cooling during the day using the stored iced and one for cooling during the night using the chiller (B) and could work during the day if not enough stored ice. These two systems are two independent loop/system. ( System is not existing in real design but equipment could be selected and designed properly)

I used EMS and schedule object to identify which chiller (loop/system) will be ON/OFF during the day/night.

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Thanks for your reply! I am now trying to use same method to build the plant loop. Does the ice storage need to be modeled with two way common pipe loop?

szsz gravatar imageszsz ( 2020-06-23 10:22:59 -0500 )edit

Yes, when you have two pumps, one fir supply and one for demand, you should insert a two way common pipe

sergerwehbe gravatar imagesergerwehbe ( 2020-06-25 07:38:20 -0500 )edit

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Asked: 2020-06-09 09:29:03 -0500

Seen: 65 times

Last updated: Jun 23