warmup3b.htm

WARM UP #3B: WINDOW- SOLAR SAVINGS FRACTION

OBJECTIVES: In this warm up you will

Learn about Energy Scheming:

enter sun angle dependent shading devices
rule of thumb parameter setting

Learn about energy:

effect of orientation on solar radiation gain
the performance of various shade types
effect of window size and placement on ventilation
the effect of sun position on radiation gain
the effect of night insulation on heat loss

Learn about architectural design implications:

the role of shading devices in facade composition (SWL #65, #66, #68)
contrasts and similarities in building and glazing orientation (SWL #31, #33, #34, #35)
glazing area and facade composition (SWL #41, #58, #60, #63)
plan openness and cross ventilation (SWL #32, #63, #64)

PROCEDURE:
1) Resize the internet browser window to a 2" wide narrow strip on the right hand side of the monitor.

2) In this exercise you will modify a file created in Warm Up
3A Intro. Open Energy Scheming by double clicking the folder and application icon, then open the file (your last name) - Bldg 1 South 100.

3) Arrange the Energy Scheming window and the internet browser window like this.

4) Under the file menu, choose Save Building File As.... Save the file as "(your last name) - Bldg. 1 South 200".

5) Select the Window Sizer... from the Rule of Thumb menu.

6) Select the take off layer and open the south elevation. Add south glazing using the existing window spec until the solar gain bar equals 100%. Save.

7) Click on the solar parameter button on the window sizer. Change to no night insulation, minimum SSF (Solar Savings Fraction), and click OK to return to the window sizer. Note that the solar gain bar still equals 100%. Close the Rule of Thumb Window Sizing Aid window.

8) To check to see the Rule of Thumb window area for SSF parameters for Dodge City, select Project from the Define menu, and click on Review/Edit Selected Climate.

9) This screen lists the Rule of Thumb for window to floor area for minimum or maximum solar savings fraction (SSF). Click Cancel to return to the climate location screen and cancel again to exit.

Questions

Please answer the following questions:
More than one answer may be correct.

10) What percentage of the floor (1600 sf) is in south glazing?

9%
12%
15%
18%

11) Change the solar parameter from no night insulation and minimum SSF to high night insulation and minimum SSF . The solar gain bar is still 100% even though the SSF has varied from 27% to 46% because:

the window area changed.
the window to floor area ratio has remained the same for the minimum SSF.
high night insulation reduces heat loss, which increases the SSF.
the solar gain bar will always remain at 100% regardless of the change to any of the parameters.

12) Change the solar parameter from high night insulation and minimum SSF to moderate night insulation and maximum SSF . The solar gain bar shows:

an increase to 150%, because the window area changed.
no change.
a reduction to 50% because maximum SSF requires a greater ratio of window to floor area.
a reduction to 50% because of the reduction in insulation.

11) Click here if you would like to see the correct answers.

Return to:

Warm Up #3 Intro
Warm Up #3A: Orientation

Go to:

Warm Up #3C: Shading
Warm Up #3D: Ventilation
Exercise #3A

Cool Down #3A

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Questions

11) Click here if you would like to see the correct answers.

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