vraagvent's profile - activity

I have the following problem with my simulation in Energyplus:

I am working on a project where I implemented a dual setpoint thermostat with a cooling (26°C) and a heating setpoint (22°C). However I can't see where to implement the deadband for the heating setpoint. In reality there is in the operation of the system a deadband on the heating setpoint. If the temperature in the zone is above 22°C the heating is switched off, if then the temperature in the zone drops below 22°C its still ok since there is a deadband of 0.5°C. The heating is switched on the moment the temperature drops below 21.5°C. I tried with EMS but then the heating is switching on/off continiously and changes the heating setpoint which I want to keep at 22.

I know that in other building simulation tools there is sometimes a differential thermostat with a deadband. However, this is not the case in Energyplus since it uses part load modelling. I asked the support desk of Energyplus but they say it is not possible since Energyplus knows the zone load and can find in this way the system operation to meet the heating setpoint.

Thanks, I will try to implement the user defined air terminal since I am using a VAV with reheat. I also asked this question during a designbuilder webinair and they told me to adjust a schedule. I now adjusted my schedule for the minimum air flow rate of the VAV with EMS and found out that this option also works.

I made a small simulation model of a school containing 2 zones with each a VAV and a CO2 control for DCV. In EMS I wrote a programm that can control the air flow rate for each zone according to a CO2 setpoint. If the setpoint is exceeded in 1 zone the air flow rate will increase for this zone. For this I used the outdoor air controller as an actuator to control the total air flow rate. The next step is to control the air flow rate for the zone seperately. Therefore, I tried some actuators like (air loop zone splitter outlet 1, Zone1VAV supply outlet and Zone 1 Air Node). The problem is that I can't control the air flow rate per zone. I specified the air flow rate for the zone in EMS per zone but nothing happens.

What is the right way to control the air flow rate per zone with EMS in energyplus?

I made this programm because I only want to increase the air flow rate when the CO2 setpoint is exceeded and not depending on the number of persons present in the room.