Subtask A; White Paper on Solar Air Heating Collectors
May 2013 - PDF 1.41MB
Editor: Les Nelson, IAPMO
Although solar air heating collectors have some significant advantages in comparison to liquid heating collectors, currently they have a market share of less than 1% (Weiss, Bergmann et al. 2009) of the global solar collector market. The main advantages of using air as heat transfer medium are the absence of stagnation and freezing problems and a reduced tightness requirement. For instance, this makes it easier to integrate solar air heating collectors into façades. Commercially available air heating collector types range from unglazed collectors for space heating support at low temperatures, to high performance evacuated tube collectors with high efficiencies at increased temperatures. An important barrier for a broader use of solar air heating collectors is the lack of common standards for testing to ascertain quality and performance. The Fraunhofer Institute for Solar Energy Systems ISE is currently working on the development of testing standards for glazed and unglazed air collectors, the development of simulation tools to calculate solar gains of solar air heating systems as well as the improvement of solar air heating collector technology. This work is done in co-operation with industry within the project ‘Luko-E’, which is co-funded by the German ministry for the environment.