[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: [EnergyPlus_Support] control theory

Simply try it by setting the heating and cooling schedules.
I usually set the dead band of type 4 thermostat to greater than 0.1 degree and works fine.  See if you would get a warning when the two schedules cross over.
There are many other possible conditions.
With seasonal settings, the main heating and cooling source are not available  together.  The reheat coil will come on only when the Zone temperature is below the setpoint, and the cooling is on, with humidity control.
Outside air is not normally involved, unless you have a manager to combine the schedules to control the OA inlet flow rate.
If you have a heating and cooling priority, it will also resolve the control. 

If the outside air temperature  is warmer than the zone air, it will warm the zone through the building envelope as well.
 Dr. Li  

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: jeannieboef@xxxxxxxxx
Date: Tue, 1 Mar 2011 18:20:39 +0000
Subject: [EnergyPlus_Support] control theory

What happens when the cooling delivery air temperature is set below the heating setpoint temp?

would the outside air mixer try to use warm outdoor air to heat the space if the setpoint temperature fell below the heating setpoint or would the heating coil kick in, or both. my setpoint sensor is at the outlet of the HVAC Airloop, which means that with the delivery temperature of 18 deg C, the sensor sees temperatures below the setpoint temperature for heating (even though room temp is still 24 deg C).

Any thoughts?


Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The primary EnergyPlus web site is found at:

The group web site is:

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.

Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe