By C.Mackenzie- Kennedy
Ebook via Kennedy, C.Mackenzie-
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Extra info for District Heating. Thermal Generation and Distribution
Rapid corrosion can be created in the water conducting pipework and steel boilers, giving rise to extremely high maintenance and replacement expenditures« Derivatives» As a development of the compressed air system, ideas were introduced 42 District Heating - Thermal Generation and Distribution for separating air from the water surface. In Denmark numerous large district systems utilise low-level expansion tanks with water separated from pressurising air by a layer of special water-impervious oil· This method appears to have been reasonably successful but latest Scandinavian practice is now also featuring the use of pressure maintaining pumps with overspill or diaphragm tanks, as described in subsequent sections.
The pressure vessel must be connected into the return line to the boiler and if circulating pump is in return the vessel connection must be at the side of pump suction. In the case of a 90°C (max) heating system there is no likelihood of the vessel temperature exceeding 50°C and this is fully acceptable for the bladder material. 17). Space requirement. 2m high and each- unit has its own control cabinet containing all regulator gear as well as the air compressor mounted on it. Alternatively, different applications can have control gear separately provided with each unit having its own floor mounted compressor.
Hot water over 110°C. 5 shows diagrammatically a basic system which has proved satisfactory. The expansion tank is connected to provide system flow distribution and circulating water returns to boilers. Boilers and expansion tank are therefore equipped with safety valves. Distribution of secondary water generated by outside or by heat-exchanger heat sources can also be based upon this expansion arrangement. 6 shows diagrammatic example of a large and efficient district heating thermal station using this principle.