Editing Solar updraft tower (section)

===Collector===
* A saltwater thermal sink in the collector could 'flatten' the diurnal variation in energy output, while airflow humidification in the collector and condensation in the updraft could increase the energy flux of the system.<ref name="Solar pond tower for 5 €ct/kWh"/><ref name="Schlaich"/>
* As with other solar technologies, some mechanism is required to mix its varying power output with other power sources. Heat can be stored in heat-absorbing material or saltwater ponds. Electricity can be cached in batteries or other technologies.<ref>{{cite web|title=Integration of Wind Energy into the Grid |publisher=European Wind Energy Association — EWEA |date=2005–2007 |url=http://www.ewea.org/index.php?id=196 |access-date=29 May 2007 |url-status=dead |archive-url=https://web.archive.org/web/20070625173146/http://www.ewea.org/index.php?id=196 |archive-date=June 25, 2007 }}</ref>
* A recent innovation has been the use of transpired collectors in place of the traditional glazing covers.<ref>[http://solarwall.com/en/home.php] {{Webarchive|url=https://web.archive.org/web/20170504161209/http://solarwall.com/en/home.php|date=2017-05-04}}{{full citation needed|date=June 2017}}</ref> Transpired collectors have efficiencies in the 60% to 80% range or three times the 25% efficiency measured with the greenhouse collectors.<ref>{{cite journal |doi=10.1016/j.enconman.2017.03.052 |title=Thermal performance of a transpired solar collector updraft tower |journal=Energy Conversion and Management |volume=142 |pages=286–95 |year=2017 |last1=Eryener |first1=Dogan |last2=Hollick |first2=John |last3=Kuscu |first3=Hilmi |bibcode=2017ECM...142..286E }}</ref> The large solar collector field can now be reduced to half or less making solar updraft towers much more cost effective. A patent has been granted on a solar tower system using transpired collectors.<ref>{{Cite patent|country=US|number=9097241|pubdate=2015-08-04|title=Transpired solar collector chimney tower|assign1=Hollick SOlar Systems Ltd.|inventor1-last=Hollick|inventor1-first=John C.|inventor2-last=Eryener|inventor2-first=Dogan}}</ref>