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Indicate whether the statement is true or false.
1. Practical solar combisystem designs minimize excess energy gain in summer.
a.
True
b.
False
2. The system of units used for inputs to the F-CHART software is not user-configurable.
a.
True
b.
False
3. F-CHART software contains a large internal database of weather data.
a.
True
b.
False
4. The thermal efficiency of solar collectors, once calculated, remains constant.
a.
True
b.
False
5. According to f-Chart method assumptions, the load heat exchanger is the total of all zoned heat emitters operating
simultaneously.
a.
True
b.
False
Indicate the answer choice that best completes the statement or answers the question.
6. What is the most typical value of the heat exchanger penalty factor for a drainback-protected system?
a.
0
b.
1
c.
2
d.
10
7. How was the f-Chart method developed?
a.
by repeated application of the TRNSYS model to a single system design
b.
theoretical modeling
c.
based on empirical correlations from TRNSYS software results using various system designs
d.
based on a set of simplified assumptions
8. How can space heating energy use be estimated?
a.
by using information on average daily water use per person
b.
by consulting a climate reference
c.
by applying the degree day method
d.
by measuring the outside air temperature and multiplying by the building’s volume
9. When using F-CHART software, where is the output information displayed?
a.
in the solar fraction window
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b.
in the thermal output window
c.
in the solar performance window
d.
at the bottom of each input window
10. What is the typical range of inputs for the collector slope angle?
a.
plus or minus 10 degrees of the local latitude
b.
plus or minus 15 degrees of the local latitude
c.
plus or minus 10 degrees of the local longitude
d.
plus or minus 15 degrees of the local longitude
11. In the equations used to calculate X and Y, what does the quantity HT represent?
a.
the height of the water in the thermal storage tank
b.
the average pitch of the solar collector
c.
the average monthly space heating load
d.
total daily solar radiation incident on the plane of the collector
12. What type of analysis determines a single variable’s effect on overall system performance?
a.
variable analysis study
b.
performance study
c.
parametric study
d.
metric study
13. What solar performance estimating software was developed in the 1970s?
a.
F-CHART
b.
F-PERCENT
c.
TRANS-SOLAR
d.
TRNSYS
14. Which value is generally the most constant over the year in a residential building?
a.
the solar fraction
b.
the space heating load
c.
the auxiliary heating load
d.
the water heating load
15. What units are associated with X and Y, as used in the f-Chart method?
a.
Btu/hr/sq. ft
b.
Btu/hr/sq. ft/degree F
c.
fractional percent, expressed in decimal form
d.
no units
16. How does F-CHART software estimate economic values?
a.
The user inputs relevant economic data.
b.
It uses a large internal database of economic values.
c.
It uses a historical model.
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d.
It does not estimate economic values, only solar fractions.
17. How is solar fraction determined once the values of X and Y are known?
a.
a nonlinear equation is applied
b.
a linear equation with integer constants is applied
c.
from the slope and y-intercept of the collector instantaneous efficiency graph
d.
it cannot be determined without using software
18. What F-CHART result indicates the system is probably oversized?
a.
more than one summer month in which the solar fraction is over 100 percent
b.
less than one summer month in which the solar fraction is over 100 percent
c.
any winter month in which the solar fraction is less than 10 percent
d.
a consistent solar fraction over a 12 month period
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1. True
2. False
3. True
4. False
5. True
6. b
7. c
8. c
9. b
10. b
11. d
12. c
13. d
14. d
15. d
16. a
17. a
18. a