Abstract
The annual performances of well insulated flat plate, vacuum tube and concentrating collectors were measured. The results show that large heavily insulated flat plate collectors have a comparable or higher annual efficiency than vacuum tubes or concentrating collector at the temperatures around 65 C required in a district heating network. The relatively poor performance of the vaccum tubes during hours of high intensity is not fully compensated by its relatively good performance during hours of low intensity. The performance of the concentrating collector is limited by the low amount of direct radiation. This means that the large flat plate collector will produce heat in the Swedish district heating system considerably cheeper than more advanced collectors.
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