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RE: [EnergyPlus_Support] Air conditioning
The drawing does not show where you have installed the thermostats. One zone can only have one thermostat. One AHU can feed many zones, but many not respond to all the thermostats.
If each equipment is an AHU at the end, with air ducts to the diffusers, usually there is only one thermostat in the return air path, if there is no adjustment to the dampers feeding the diffusers.
If you have thermostat in each room, then the thermostat would control its respective damper or VAV diffusers, or through a computer controlled system which monitor all the thermostats.
What you may have in a simple system is a common plenum or partitioned plenum on the return path which has a thermostat.
The main system (eq.1) will start first, when the capacity is not sufficient, the smaller zone equipment (eq. 2,3,5) will be added in each zones. These units will cool the return air in the common plenum, and thus share the load.
EQ. 11 and 16 is another zone pair.
Zone with eq.6 may use zone mixing first and then turning on the equipment. Zone mixing has air flow moment, and the use of IR transparent material partition will transfer heat load but without air moment.
There are fixed damper and VAV damper in the EPlus to distrubute air to the zones. The air from the two system will be well mixed in the zone area and then exhausted as one into the plenum as return air. The plenum acts ass an air mixer.
Multiple simple diffuser is considered as one source. For two AHU;s feeding the same zone having only one thermostat control, one AHU is a master controlled by the termostat, and the other is a slaveed unit, with priority control. Air distribution can be different fron each diffuser by setting a ratio, and the sum of all of them must be added to unity for one AHU.
I have not programmed the system described above myself. This is the way I start planning the EPlus simuation and then fit in the equipment object required to match the real installed system.
I hope I have not confused you more.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx
Date: Sat, 15 Jan 2011 10:49:10 -0500
Subject: RE: [EnergyPlus_Support] Air conditioning
Dear Juan Pablo,
I do not think that there is a method to simulate the exact situation that you show on the drawing.
As an alternative to an exact solution: For each room which is served by two different air conditioners, you might consider dividing the room into two rooms and letting each air conditioner serve one half.
The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Juan Pablo Cartagena Portillo
Sent: Friday, January 14, 2011 11:21 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Air conditioning
I have a case of air conditioning, suppose there are two areas (A and B) in Zone A is a 2-ton air conditioner and the area B is a 3-ton air conditioning, but the air conditioned area B flow not only serves your area, but also distributed in the area A. Now E + define two areas A and B, and each one will define your thermostat, then I have two objects HVACTemplate: Thermostat, two objects HVACTemplate: Zone: Unitary and two objects HVACTemplate: System: Unitary, when I rezolver the problem above, declare another object in HVACTemplate: Zone: Unitary with the same name but with distribution zone A team from the area B, and E + I get an error that
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