Chilled Water Pumps Availability Schedule

asked 2016-09-02 00:40:22 -0500

Carlos Vazquez

812 ●2 ●12

updated 2016-09-02 01:30:49 -0500

Jamie Bull

flag of United Kingdom of Great Britain and Northern Ireland

5072 ●6 ●27 http://oco-carbon.com/

I have been looking for a way to attach the pump operation in a primary-only chilled water loop to the chiller on-off schedule in EnergyPlus. Even when I have chosen an intermittent operation for the pump, when I set a non-zero minimum flow for it, the pump starts whenever the loop is available even when the chiller is off.

I have tried other ways to turn off the pump, like setting up the AvailabilityManager:LowTemperatureTurnOff object. It works better to control when the pump starts and turns off, but still can not attach the pump operation to the chiller.

Is there is anyway to do this with a non-zero minimum flow?

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2 Answers

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answered 2016-09-05 08:51:34 -0500

Carlos Vazquez

812 ●2 ●12

I tried the EnergyManagementSystem:Sensor object but was not able to get the pump linked to the chiller start/stop sequence. If the sensor and the actuator are both inside the chilled water loop it does not work. At least the sensor has to be outside the chilled water loop.

The chiller on/off sequence is controlled by the plant operation scheme and the loop availability manager. The pump is controlled by the loop availability manager. So far what still continues to be working better for me is to setup the AvailabilityManager:LowTemperatureTurnOff object to turn off the chilled water loop with low outdoor air temperature.

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answered 2016-09-02 12:52:23 -0500

TaylorRoberts

2903 ●1 ●2 ●13 http://www.group14eng.com/

Have you tried the Energy Management System (EMS) in Energyplus? EMS has a EnergyManagementSystem:Sensorthat can use a schedule value and apply that value to an EnergyManagementSystem:Actuator that overrides the control of your pump. You can look more into it in the EnergyPlus Input Output Reference.