Energy Analysis of Closed Systems

Write a short essay (with a minimum length of a half page, double spaced, using Times New Roman, 12 point) summarizing a research paper relating to the energy analysis of closed systems. Read the paper and describe the system it discusses in your own words. Is this a closed system? Choose one of the following:

https://asmedigitalcollection.asme.org/solarenergy…

http://citeseerx.ist.psu.edu/viewdoc/download?doi=…