IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at
IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask C Report, Date: 13.01.2009 The limits of concentration of silver and copper ions depend on the kind of used water and on its chemical balance. 5.5.3 Realization of the method A suitable concentration of silver/copper ions can be produced with the help of electric current. Only some milliamperes of electric current are necessary to produce the required quantity of silver/copper ions for the disinfection of the open water circuit of wet cooling towers. An electronic device produces this necessary electric current on a low voltage level. The electronic device is designed in such a manner that also the personal safety of the people making the maintenance is secured. Figure 5-8 and Figure 5-9 displays the realized device for the test described. Figure 5-8: Test device for silver/copper ions production (courtesy of ECONICsystems) page 37
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask C Report, Date: 13.01.2009 Figure 5-9: Silver/copper electrodes for cooling tower basin (courtesy of ECONICsystems) The silver/copper electrodes are also available for integration in the cooling water pipe system. In summary it can be said, that the first results are promising to the development of a suitable disinfection method for small scale wet cooling towers. However, further research on the disinfection method and tests in real heat rejection applications are necessary to verify the effectiveness of the disinfection method in long term tests and for different chemical composition of the cooling water. This shall be carried out in near future. 5.6 Cost comparison After analysis and description of the two physical water treatments for a hygienic operation of small wet cooling towers, it is also worth to compare the estimated cost of the proposed measures. In the table below the investment and operation cost are listed over an operation period of 15 years. Table 5-2 Annual cost of hygienic measures for a small cooling tower (30 kW) over a operation time of 15 years Investment Operational cost Maintenance & replacement Euro Euro/a Euro/a page 38 Remarks UV-C disinfection 450 1) to 1000 2) 90 65 Cleaning, lamp Silver/copper disinfection ions Note 1) : Equipment according to Figure 5-5 Note 2) : Equipment according to Figure 5-6 100 to 300 0,5 27,5 Inspection The numbers in the Table 5-2 are calculated for a small wet cooling tower with cooling capacity of 30 kW under the following conditions:
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<strong>IEA</strong> SHC Task 38 <strong>Solar</strong> Air Conditioning <strong>and</strong> Refriger<strong>at</strong>ion Subtask C Report, D<strong>at</strong>e: 13.01.2009<br />
The limits of concentr<strong>at</strong>ion of silver <strong>and</strong> copper ions depend on the kind of used w<strong>at</strong>er <strong>and</strong><br />
on its chemical balance.<br />
5.5.3 Realiz<strong>at</strong>ion of the method<br />
A suitable concentr<strong>at</strong>ion of silver/copper ions can be produced with the help of electric<br />
current. Only some milliamperes of electric current are necessary to produce the required<br />
quantity of silver/copper ions for the disinfection of the open w<strong>at</strong>er circuit of wet cooling<br />
towers. An electronic device produces this necessary electric current on a low voltage level.<br />
The electronic device is designed in such a manner th<strong>at</strong> also the personal safety of the<br />
people making the maintenance is secured. Figure 5-8 <strong>and</strong> Figure 5-9 displays the realized<br />
device for the test described.<br />
Figure 5-8: Test device for silver/copper ions production (courtesy of ECONICsystems)<br />
page 37
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