Something else to be aware of:
The ZoneHVAC:EquipmentList object asks for the Cooling and Heating sequence priority, and uses this to determine which of the zone equipment items to apply in order to satisfy a load.
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of jeannieboef@xxxxxxxxx
Sent: Thursday, October 17, 2013 2:52 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Cc: energyplus_support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] How does the zone temperature control a Boiler / radiant baseboard plant loop?
I think this has recently changed. Each baseboard usually has its own thermostat (that's been the law in Germany for many decades). I believe e+ currently tells the baseboard to try and pick up any remaining load after all the other bits have done there part (i.e. Air from mechanical, infiltration, surface convection, etc.), however the zone equipment list also sets the heating (and cooling) priorities of each zone equipment...so fan coils used to be able to pick up the loads not met by a baseboard if it was set as second priority. I'm not sure this is still the case. Radiant systems are inherently slow responders because heat can only transfer via a slow convection mechanism.
The zone node's air setpoint temperature is set by thermostats as you have mentioned. The load of the zone is the energy required to reach that setpoint from the current state (timestep based). As you mentioned, both single and master thermostat options are available to place that setpoint on the zone air node.
LowTempRadiant are exceptions and require their own zone setpoint independant of the zone air setpoint.
In both cases there are advanced control options (MAT or OT or MRT).
Mit freundlichen Grüßen- Sent from my iPhone (excuse the brevity)
i. A.
Jean Marais
b.i.g. bechtold
Tel. +49 30 6706662-23
On 17.10.2013, at 00:47, "Humphrey, Neal" <neal.humphrey@xxxxxxxx> wrote:
Hi,
I’ve set up a boiler system with radiant baseboard (RadiantConvective:Water) in BeOpt and am making some changes to it manually to model the effects. What I’m trying to figure out is - how this plant loop system is being controlled to meet the zone demand? For a central air system, the AirLoopHVAC:UnitaryHeatCool object has a field called ‘Controlling Zone or Thermostat Location,’ so when I have multiple singleduct:uncontrolled air terminals, they are called by that single zone. What is the equivalent of this for the radiant systems. I have baseboard units in two zones, split out from a single boiler. I can’t tell how E+ knows how much heat the boiler should be delivering.
Neal
NEAL HUMPHREY | Senior Associate | 919.449.6879 | nhumphrey@xxxxxxxx
ICF INTERNATIONAL | 9300 Lee Highway, Fairfax, VA 22031 | icfi.com
__._,_.___
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:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
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.
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
__,_._,___