[EnergyPlus_Support] entering coordinate geometry from drawing.

["drjonesg1958" <drjonesg1958@xxxxxxxxx>]

Hi,
I am trying to automate input, by selecting room coordinates from
Autocad drawing. 
In Autocad drawing, the room coordinates vary after taking into
account wall thickness.

1.While entering coordinates in surface:Heat Transfer object, is it
okay to enter vertex as per internal room drawing coordinates and
correctly specify  outsidefaceenvironment object.

To illustrate 2 zones of 4 m x 4 m side by side as shown,

*********************************************************
* *********************** ****************************  *
* *  ext wall1          * *    Ext wall2             *  *
* *                     * *                          *  *
* *    int wall space a * *   int wall space b       *  *
* * __________          * *   __________             *  *
* * | zone a |          * *   | zone a |             *  *
* * |________|          * *   |________|             *  *
* *                     * *                          *  *
* *                     * *                          *  *
* *********************** ****************************  *
*********************************************************
vertex entered manually after removing wall will be 
(4,4,3.2),(4,4,0),(0,4,0),(0,4,3.2)!vertex of ext wall1
(8,4,3.2),(8,4,0),(4,4,0),(4,4,3.2)!vertex of ext wall2
(4,4,0),(0,4,0),(0,0,0),(4,0,0)! for floor zone a
(8,4,0),(4,8,0),(4,0,0),(8,0,0)! for floor zone b
(4,4,3.2),(4,4,0),(4,0,0),(4,0,3.2) 'for int wall space a
(4,0,3.2),(4,0,0),(4,4,0),(4,4,3.2)'for int wall space b

name of intwall space a--intwall1
OutsideFaceEnvironment Object = intwall2

name of intwall space b--intwall2
OutsideFaceEnvironment Object = intwall1

vertex from drawing with walls will be 
(4.23,4.23,3.2),(4.23,4.23,0),(.23,4.23,0),(.23,4.23,3.2)!vertex of
ext wall1
(8.69,4.23,3.2),(8.69,4.23,0),(4.46,4.23,0),(4.46,4.23,3.2)!vertex of
ext wall2
(4.23,4.23,0),(0.23,4.23,0),(.23,.23,0),(4.23,.23,0)! vertex floor zone a
(8.46,4.46,0),(4.46,8.46,0),(4.46,0,0),(8.46,0,0)! vertex floor zone b
(4.23,4.23,3.2),(4.23,4.23,0),(4.23,.23,0),(4.23,0.23,3.2) 'for int
wall space a
(4.46,0.23,3.2),(4.46,0.23,0),(4.46,4.23,0),(4.46,4.23,3.2)'for int
wall space b  

name of intwall space a--intwall1
OutsideFaceEnvironment Object = intwall2

name of intwall space b--intwall2
OutsideFaceEnvironment Object = intwall1

2. How is plenum space of return air path not directly over air
conditioned areas modelled? For example, return air passing through
plenum over unconditioned corridor.

3. How to include AHU room in the model? These rooms will have surface
loads from walls / roof which will have be added to return air load
when return air is not ducted and is collected over plenum. Especially
 in VAV / FCU system how to assign system to this room?

thanks,

s.gopal  




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