MODULE II
Solar energy technology Page 29

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Storage designs

Simple storage system with external additional heating system

In the lower half of this simple storage system there is a heat exchanger with which the entire storage volume is heated over the solar heating system. In the upper half there is a heating coil coming from an external heater (boiler) for additional heating requirements. As heat exchangers mostly pipe bundles in smooth, gilled or spiral forms are being used. Simple storage systems of this kind had their origins in the beginning of the sixties and are still being used today even if their disadvantages are well known among experts. So, the solar energy is being brought into the system but it can not be used for additional heating purposes. Furthermore, with these systems there is the danger that bacteria (e.g. the dangerous bacteria that cause the so called "legionnaire's disease") can survive in the water since the lower part of the storage is not being heated enough in the autumn and winter transition periods in which there is not enough sun energy available. Further disadvantages consist in the relatively high energy losses of this system and the accumulation of calcifications in the inside of the storage tanks. Particularly the latter reasons will most likely have the effect that in future systems of this kind external heat exchangers will be used. Diagram 29 and 30 show the function of such a simple storage system with additional external heating system.

Diagram 29: Function of a simple storage system with additional external heating system




English translation of technical terms and sentences in diagram 29:


Nachheizung
= Additional heating system
Heizsystem = Heating system
Brauchwasserspeicher = Water storage tank for water that is being used
Solarkreis = Solar energy circulation system
Ventil = Valve
Pufferspeicher = Buffer storage tank



Diagram 30: Special sectional view showing the function of a simple storage system with external additional heating system




English translation of technical terms and sentences in diagram 30:


Wärmetauscher der Nachheizung
= Heat exchanger of the additional heating system
Wärmetauscher des Solarkreises = Heat exchanger of the solar energy circulation system

 

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