The Vertical-Tube Solar Collector: A Low-Cost Design Suitable for Temperate High-Latitude Locations

Table 1

Parameters for the cold-climate location of Ushuaia (55°S) [5].

Date/season	𝐺^′′ (kWh/m^2)	𝐼 (W/m^2)	𝑇𝑎 (°C)
January 1/summer	5.5	580	14 ± 8
March 21/fall	2.5	570	5 ± 5
July 1/winter	0.5	530	−2 ± 4