Heliostat ->> Hands down the cheapest way to gather the suns energy

Hands down the cheapest way to gather the suns energy


Glossary 



Heliostat: A mirror that reflects solar rays onto a central receiver. A heliostat automatically adjusts its position to track daily or seasonal changes in the sun's position. The arrangement of heliostats around a central receiver is also called a solar collector field.

Cost per Meter² of Heliostat Mirro …basically represents the cost of using the heliostat. The type of heliostat used is not as important as its cost. Since the mirrors surface is where the energy is coming from, its Cost per Meter² of Heliostat Mirror is a significance term

This term represents two costs, the cost to install and maintain the heliostats. The installation cost will typical be a number easier to quantify. The maintenance cost will be a more difficult one to determine.

Being that there are no purchasable heliostats for the purpose of electrical generation. The cost of using the heliostat is basically an unknown cost. If there was a heliostat that was purchasable for electrical generation both of these costs would no longer be unknown.


Heat Collection Efficiency The percentage of the incident solar radiation that is converted to
usable heat by the solar collector

Power Cycle Efficiency: The percentage of the thermal energy that is converted electrical
energy (gross)

Parasitic Efficiency: The conversion from gross efficiency to net efficiency accounting for
losses from parasitic electric power to operate the plant and losses from start-up and part load
operation (assumed to be 5%).

Solar-to-Electric Net Efficiency: The net operating efficiency of the plant, or the percent of the
incident solar radiation that is converted to electricity for the grid

Annual Solar Efficiency: The Solar-to-Electric Net Efficiency on an annual basis accounting for
plant downtime (5%) and below optimum performance (5%).

Plant Capacity Factor: The annual electricity output divided by the maximum plant output or
the percentage of the time the plant is operating (at full load)

Solar Capacity Factor: The annual electricity output provided by solar energy divided by the
maximum plant output or the percentage of the time the plant is operating (at full load) on solar.
The ratio of the solar capacity factor to the plant capacity factor is the fraction of the plant output

Solar Collector Type:
A solar collector is used to concentrate solar radiation onto a receiver where heat transfer to a
fluid takes place. In this study, two concentrating solar thermal collection technologies are
examined: parabolic troughs (or “troughs”) and solar central receivers (often termed “power towers”).