A small minimum of the total annual cost was found in Figure 1, 5 and 6 with the reference costs for the three weather conditions. When increasing the auxiliary fuel cost in Figure 2 the minimum is more marked at around 20,000m2 collector area for a storage volume of 20,000m3 this means a solar fraction of about 80% and for 100,000m3 the solar fraction is 97%.
In Figure 3 the solar collector cost is decreased which only makes big influences on large areas.
In Figure 4 the storage cost is decreased which brings the curves closer together.
The Madison and Copenhagen weather seems to give higher total annual costs compared to Boston although the solar fraction is less as seen in Figure 7, 8 and 9.
Conclusion
The Swedish Application Case Study has not yet been compared with the results from the Lyckebo project. This will be done to give feedback to the MINSUN model from a real case.
The MINSUN model has limits in this case study as the temperature level in the storage will not vary as they do in the real project.
TOTAL
ANNUAL
COST
TOTAL
ANNUAL
COST
TOTAL
ANNUAL
COST
M$
140,0 m’
60.0 m~
140,0 m‘
60.0 ml
t “і—- 1— 1— 1— і– r-
5 10 15 20 25 30 35
3 2
COLLECTOR AREA 10 m
MADISON
T– i— Г— 1— 1—– 1— г
5 10 15 20 25 30 35
