Evacuated Tube Solar Collectors

Evacuated tube solar thermal collectors are more efficient than flat panel type collector owing to their construction. The tubular shape allows sunlight to be collected from a wider angle than flat panels, resulting in better performance in systems where the roof does not face directly south, whilst the integral vacuum affords excellent insulation from the ambient air for improved heat output at lower external temperatures.

Collector specifications

	10 Tube Collector	20 Tube Collector
Dimensions	1955 x 852 x 100mm	1955 x 1632 x 100mm
Weight	42kg	78kg
Gross Area	1.70m²	3.25m²
Aperture Area	0.94m²	1.88m²
n0	0.681	0.681
A1	1.982Wm²/K	1.982Wm²/K
A2	0.0124W/m²/K²	0.0124W/m²/K²
Minimum Output	890kWh/year	1780kWh/year

Package information

	10 Tubes	20 Tubes	30 Tubes	40 Tubes	50 Tubes
Array Dimensions	1955 x 852mm	1955 x 1632mm	1955 x 2534mm	1955 x 3314mm	1955 x 4216mm
Typical Cylinder Size	150L	200L	300L	400L	500L
Typical Occupants	1	2	3	4	5
Solar Input for RHI	662kWh/year	1118kWh/year	1549kWh/year	1961kWh/year	2368kWh/year
Estimated Annual Fuel Saving	863kWh/year	1456kWh/year	2017kWh/year	2554kWh/year	3083kWh/year

The above example figures are calculated using MCS MIS 3001 Solar Domestic Hot Water Calculation v1.0 guidelines and are based on an MCS compliant system using a south facing array on a 40° pitched roof connected to a cylinder of typical size with the typical number of occupants in London, UK.

Please note that the performance of solar heating systems is impossible to predict with certainty due to the variability in the amount of solar radiation (sunlight) from location to location and from year to year together with variability in heat demand. This estimate is based upon the standard MCS procedure and is given as guidance only. It should not be considered as a guarantee of performance.