At the present time two Swedish group solar heating plants with seasonal storage, connected to residential areas with about 50 single-family houses, have been in operation for 4 years. The Lambohov Plant has a total of 2700 m2of flat plate collectors and a 10 000 m3rock pit store. The Ingelstad plant has a total of 1300 m2of concentrating collectors and a 5000 m3free-standing tank. The emphasis of the assessment has been on system performance as a whole. Most of the emphasis has been placed on general conclusions concerning technology and economy for seasonal storage plants.
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