WARM UP #4: DAYLIGHTING AND ELECTRIC LIGHTS



OBJECTIVES: In this warm up you will:

Learn about Energy Scheming:

Learn about energy:

Learn about architectural design implications:

PROCEDURE:
1) Transfer a copy of the Warm up 4A file to your desktop (click on the file name).

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




3) Open the file Warm up 4A. This building file contains a diagramatic drawing of a library. The climate has been set to Madison, Wisconsin, the building type to non-residential, and the building size at 8,000 sf. The Preferences have been set, infiltration turned off, and the schedule changed to reflect an occupancy from 6 am to 10 pm.

4) Arrange the Energy Scheming and internet browser windows so you can see them both.

5) Save the file as "(name) Bldg 1 Light".



6) Create a plan drawing spec at 1" = 40'. Create a lighting spec by double clicking the Lighting zones icon, and double clicking the New Lighting Zones Spec.




7) Click on Select Types and Levels to set the lighting level.




8) Create a lighting spec with light type of Batwing Louvered and light level of 50 footcandles (Library (50 fc)). First select Batwing Louvered, then select Library (50). Click OK button.




9) Takeoff the whole floor plan and close the spec.




10) Answer Continue to the warning dialogue box that comes up. This will cause the light spec to be set to a single daylight zone.




11) Go to the Graphic report and set the scale to 20,000 BTU and select By Element Group, and set the climate to March and June only. Let Energy Scheming calculate.

12) Print the Building Schedule and By Element Group graphs, and save.


13) Save the Bldg 1 Light file as "(name) Bldg 1 Window".




14) We will assume that the program calls for south glazing in the reading room, and for now will not worry about the effects of direct light on the stacks. Create a south elevation and make a window spec set at fixed/double glazed windows with no external or internal shades.





15) Note that if you make a mistake, you can delete takeoffs as well as specifications by using the thumbsdown tool. In order to delete a specification, its associated takeoffs must be deleted first.



16) Take off the south windows. You can use the duplicate tool to create the second window with the same area and shape as the first window. After you have created the first takeoff, switch to the arrow tool and select the takeoff just created. Now switch to the duplicate tool, and click in the area of the second window to create a takeoff identical to the first. Switch back to the tape measure tool to takeoff the middle window. You should have about 1300 sf of window before you close the spec.




17) Calculate and print the By Element Graphs. Save the file, and close it.


Question
Please answer the following question using the graphic reports:
(More than one answer may be correct).

18) Compare the graphs from Bldg 1 Light and Bldg 1 Window. We can tell the effects of daylighting because:

heat gain from electric lights is reduced in Bldg 1 Window bar graphs.
solar heat gain is increased in Bldg 1 Light.
when a window and an electric lighting spec are assigned the same zone, Energy Scheming automatically dims the electric lights appropriately.
Daylighting is not evident in Bldg 1 Window.



19) Reopen the file Warm up 4A and save it as "(name) Bldg 2 Light".

20) For the first building file we created only a single lighting zone as a way to get a broad idea of performance. This time we are going to refine the model by dividing the plan into two zones based on task zone and daylight penetration. Again create a plan drawing spec at 1" = 40'.




21) Select Define Daylight Zone icon from the Define menu.




22) The daylight zone screen will appear. Create two rectangular zones to represent the two areas of the plan. You are creating a reference diagram, so exact area and dimensions do not matter.




23) Next, label the two zones by selecting the arrow tool and first clicking on the number and then inside one of the rectangles, as shown above. This diagram appears on both the window and electric lighting specifications. In this way, Energy Scheming is instructed to link the natural daylight available through the windows adjacent to a space to the electric lighting needed in that same space. Energy Scheming adjusts or dims the electric lights according to the amount of available daylight. Close the window.




24) Create a lighting spec set at Batwing Louvered (Library (50 fc)). Select zone I in the light spec. Take off just the stacks/reading room area in the plan. Close the spec.




25) Now create another light spec by double clicking the new lighting spec icon. Set this spec at batwing louvers and 30 fc (Classroom).




26) Take off the services area of the plan and select zone II in the light spec.





27) Go to the Graphic report and set the scale to 5,000 BTU and select By Element Group, and set the climate to March and June only. Let Energy Scheming calculate.

28) Print the By Element Graphs. Save the file, and close it.


Question
Please answer the following question using the graphic reports:
(More than one answer may be correct).


29) Compare the graphs from Bldg 1 Light and Bldg 2 Light. The area of electric lighting in each case is the same, yet the difference between the graphs is:

twice as much heat gain from electric lights in Bldg 2 Light.
there is no difference.
reduced heat gain in Bldg 2 Lights because part of the area (the second zone) has less intensity of light (footcandles).
a slight increase in heat gain because the addition of a lighting zone increase the amount of heat gain.



30) Save the Bldg 2 Light file as "(name) Bldg 2 Window".




31) Create a south elevation and make a window spec set at fixed/double glazed windows with no external or internal shades. Click on daylight zone I.



32) Now open the Rule-of-Thumb->Window Sizer. The Rule of Thumb (ROT) window sizer provides immediate feedback on the design in progress. It recommends greater or smaller window area for daylighting based on the daylight factor and the percent of floor area that is required in glazing. The ROT for daylighting assumes overcast conditions as well. The ROT assumptions do not affect the building element specifications.




33) Click on the Daylight parameters button. Select zone I. Note the assumptions, then click OK.





34) Close the dialogue box and change the window takeoff until you have reached 100% of the window area needed for daylighting.


Question
Please answer the following question:
(More than one answer may be correct).


35) How do the daylighting ROT assumptions compare with what has actually been specified and taken off?

They are different because the ROT assumes single glazing, and we have specified double glazing.
They are different because the ROT assumes operable shades, and we specified no shades.
They are the same because the ROT assumes single glazing, and we have specified single glazing.
They are the same because the ROT assumes a fixed (non-operable) window, and we have specified a fixed window.






36) Compose the south elevation to match the current takeoff. Switch to the draw mode and trace the takeoffs you have just completed. You may need to toggle the takeoffs off and on by setting Takeoffs... under the View menu to Open Spec Only to hide and Open Drawing to show (assuming you switched to draw mode while the south elevation icon was open.


37) Print the By Element Graphs. Save.


Questions
Please answer the following questions using the graphic reports:
(More than one answer may be correct).


38) Compare the bar graphs from Bldg 1 Window with those from Bldg 2 Window.

In the Bldg 2 Window file, the two electric lighting zones with different lighting requirements generate less heat gain from 6 pm to 10 pm than the electric lighting in Bldg 1 Window.
In the Bldg 1 Window file, the electric lights add heat to the building in every hour from 6 am to 10 pm.
The peak load in June in Bldg 2 Window is greater than Bldg 1 Window.
In the Bldg 2 Window file, electric lighting is producing heat from 6 am to 10 pm.


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



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Exercise #4A
Cool Down #4A

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