For this project the client specified, Veissmann Vitosol 200T vacuum tube collector, connected to a 500 litre Veissmann hot water cylinder. The evacuated tube technology is approximately 20 per cent more efficient than equivalent flat plate system.
The expected output of the system is 3,050kW a year, which will offset the gas needed generate this energy.
The solar vacuum tubes were installed on the roof of the two-storey building using ballast rather than a fixed frame so we didn’t puncture the sedum membrane.
Scaffolding and harnesses were needed to gain safe access to the roof. As a new build, we had to liaise with other trades, including electricians and plumbers, who were doing the internal works at the same time as we were on site.
As a publically-funded building, this project is not eligible for the Renewable Heat Incentive.
However, had it been a private sector client, they could have expected a payback period of approximately eight years.
The system would generate savings of about £100 a year and RHI payments of almost £600 a year over 20 years.
|Main contractor||Hobson Porter|
|Renewable technology||Solar thermal|
|System used||Veissmann Vitosol 200T vacuum tube collector|
|CO2 saving||Estimated 564 kg a year|
|Energy cost saving||£100 a year compared to oil.|
|RHI payments||£600 for 20 years, index linked to inflation.|
|Payback period||Estimated year 8 (combining RHI income and energy cost saving compared to oil)|