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MarketManager » Results
Q: How do I get total ton-hours, total run hours, and average chiller load per chiller (tons) for the entire year from MarketManager?

A: 

To get total ton-hours :

  1. Change the Chiller's Cooling Type to district cooling
  2. Set nominal efficiency to 100% (COP = 1), then the input energy =output energy,
  3. Set the input fuel to something measured in KBtu or MBtu (such as Solid Fuel).
  4. In the Rates View, add a rate for Solid Fuel (or whatever fuel type you chose in step 3) and use the following conversion factors:
  • 12000 Btu/Tonhour
  • 12000 Btuh/Ton
  1. Be sure that the rate has energy charges and demand charges forms attached to it. You can set the actual cost amounts to anything.

  2. Simulate

  3. You can see chiller ton hours in results if you view results for Solid Fuel (or whatever fuel type you chose in step 3).

 

To get total full load run hours:

  1. Change the chilled water pump control strategy to "cycling", as then it will be "on" whenever the chiller is on, and "off" whenever the chiller is off.
  2. Set the chilled water pump kW value to 1.
  3. Zero out the condenser water pump kW.
  4. Set the Auxiliary End Use to "Process" or some other unused enduse.
  5. Simulate
  6. Look in summary results for Process kWh. This should have the number of full load hours for the chiller.

To get total number of run hours:

  1. Change the chilled water pump control strategy to "cycling", as then it will be "on" whenever the chiller is on, and "off" whenever the chiller is off.
  2. Set the chilled water pump kW value to 1.
  3. Zero out the condenser water pump kW.
  4. Set the Auxiliary End Use to "Process" or some other unused enduse.
  5. Using the same district cooling "chiller" from the first question, decrease its capacity a lot, to 0.1 Tons or so.
  6. Simulate.
  7. You may get a ridiculous number of unmet cooling hours, of course, but you will have essentially created an on/off device except for the very rare times where the load was < 0.1 Tons (which does happen).
  8. Look in summary results for Process kWh. This should have the number of hours in which the chiller was run. If you look in loadshape results for Process, you will see a "1" by each hour the chiller was on, and the load was greater than 0.1 tons. If you see a "0.5", that represents the hours in which the chiller load was less than 0.1 tons.

To get average chiller load:

You can divide total ton-hours by total chiller run hours.

Note: If you have several chillers in your project, and you intend to add a dummy chiller to record this data (for section II or section III above), then be sure to:

  1. list the dummy chiller as the first chiller in your project. Then it will stage on first.
  2. be sure that the staging is set to staged sequential. If you stage it parallel, or just have the chillers run parallel, you won't get the correct number of run hours. This is because all chillers will be running at part load -- as they are parallel. You want your dummy 0.1 ton chiller to run at full load.

I can’t find the answer to your question ? Try checking our User Forums.

Otherwise feel free to contact our Tech Support staff at (805) 329-6565, or via email at helpdesk@abraxasenergy.com.



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