Development of Control Systems for Solar Water- and Space Heating Equipment. Choice of Heat-Conducting Fluid Testing

摘要

For flat plate collectors, systems have been developed that are suitable for hot water supply, swimming pool heating and auxiliary space heating. A control and ready - made packaged pipe assembly adapted to synthetic fluid have been developed. A heat transfer fluid has been selected and tested. Pumps, safety devices, fittings and seals have been selected and tested for their long-term performance. Comparative tests with various collector constructions and flow rates have been performed. External heat exchangers for simple and cascade arrangement of the hot water tanks have been developed and tested. The channel design of a roll-bonded absorber has only limited effect on collector performance if the channel width approximates the space between the plates. The system is now in the production stage. Installations are being constructed.