OBJECTIVES: In this exercise you will:
Learn
about Energy Scheming:EXERCISE #2A: WALLS, ROOFS, FLOORS
OBJECTIVES: In this exercise you will:
Learn
about Energy Scheming:
Learn
about energy:
Learn
about architectural design implications:
PROCEDURES:
1) Download the Exercise 2A file.
2) Resize the Netscape window to a 2" wide narrow strip on the right
hand side of the monitor.
3) Drag the Exercise 2A file from the Desktop over the Energy
Scheming application icon to open it.
4) The Energy Scheming window should appear on the left
and the Netscape window on the right.
5) Note that the Exercise 2A file has the following attributes set:
The climate is Phoenix, the building type is defined as residential,
and the building size is 1200 sf. You will see that the Draw layer
has three squares in it, labeled "Wall", "Roof", and "Floor".
6) The Preferences have already been set and infiltration turned off.
To check the preferences, go to the Options menu.
7) The Preferences should look like this.
8) To check that the infiltration has been turned off, select
Infiltration/Min. Vent Rate under the Define menu.
9) Both the Occupied and Unoccupied portions of the Infiltration or
Minimum Ventilation Rate screen should be set to zero.
10) For this exercise, we will look at the energy performance of a
wall, floor, and roof in Jun and Dec of the Phoenix climate. Select
the Graphic Report from the View menu.
11) The Climate floating palette should have just the months of Jun
and Dec checked. In the Graph floating palette the scale should be set to
100 BTU and showing By Element Group.
12) Select Takeoffs from the View menu.
13) Set the dialog box to look like this. This sets all takeoffs to
be visible at all times. Click OK.
14) Switch to Takeoff Mode and open Elevations from the File
Cabinet.
15) Create a south elevation with a scale of 1"=10' and close the
Drawing Specification window.
16) Create a wall spec by double clicking on the South Elevation
icon, the Walls icon and the New Walls spec respectively. Click in
the graphic icons to select wood, wood stud, 4"
batt , gyp board.
17) Click the Detailed Wall Design button. This shows what the actual
thermal properties are of the wall spec. This is what it should look
like. For now just note the properties and their values, then close
the window.
18) Click the wall spec's zoom box (right side of the titlebar) to
reduce the area obscured by it.
19) Do a takeoff over the rectangle labeled "Wall" with the takeoff
tool so that the area is exactly 100 sf. Close the spec.
20) Save your work so you don't lose it. Select Save Building File As
from the File menu and save under the name "(your last name) - W/R/F
1 Phoenix".
21) Next create a floor spec. Select Plans from the File Cabinet.
22) Double-click the New Plan icon to open a drawing spec. The scale
will already be set at 1"=10' since the elevation previously created
was set to this scale. Close the drawing spec window.
23) Open the Plan 1 icon. You will see seven icons appear.
Double-click the Floor element icon on the left side of the
window.
24) Double-click the New Floor Spec icon to create a floor spec.
Click on Detailed Floor Design.
25) Change the R value to match that of the wall spec you just
created, then close the window.
26) Note that the material selections are replaced by the
user-defined R-value. Do a takeoff over the rectangle labeled
"Floor", just as you did with the wall. Be sure the area equals 100
sf, then close the floor spec window.
27) Open a roof spec just as you did the floor. Click on Detailed
Roof Design button. Change the Total R-values to match that of the
floor and wall. This will make it thermally equivalent to the wall
and floor specs. Close the window to return to the roof spec
window.
28) To create the takeoff we will do something different. Select the
arrow tool from the tool palette on the left side of the screen.
Click once on the previously created floor takeoff to select it.
29) Now choose Associate Takeoff with Open Spec from the Options
menu. This command creates an exact copy of the selected takeoff and
associates it to the open spec.
30) Notice that the area taken off is 100 sf. Click within the
takeoff and drag it over the rectangle labeled "Roof".
31) Change the take off pattern by clicking on a pattern in the
pattern box of the spec window. Close the spec window.
32) Select Graphic report from the View menu and click on the
calculation icon to let Energy Scheming calculate. The
graph format is already set. The first two graphs will look like
this.
33) Save the file.
34) We can inspect the rates of heat gain and loss through the wall,
floor, and roof using Thermographics. Select the Drawing/Takeoff
layer from the View menu. Arrange the Drawing/Takeoff and the Graphic
report window so they can be seen together. You may reduce the size
of the Color chip floating palette by clicking on the lever on the
left side under the graph.
35) Click and drag the small black diamond shaped control, sliding it
across the schedule of hours of the day to make the thermographics
appear on the Drawing/Takeoff screen. Inspect the rate of heat gain
and loss over 24 hours in June and December.
Please answer the following questions.
You may wish to do Energy Scheming runs to answer these questions. If
you want to compare graphic reports, print them out by selecting
Print Energy Performance Report from file menu and configure the
print dialog box to look like
this:
Return to: Warmup #2A
Go to: Cooldown #2A
Return to: Topics Page