Heating & Cooling

Numerous industrial and commercial enterprises in Austria show significant waste heat potentials which are often not used because of their low temperature levels.

Even low investments pay back

A professional survey and evaluation of heat potentials provides the basis for an economic integration of industrial waste heat sources in house, but also in municipal heat supply systems. The use of industrial waste heat does not only increases the energy efficiency of the company, but it also reduces the use of non-renewable energy sources, lowers operating costs and is therefore is highly relevant to the climate.

Case study – a waste treatment facility

Based on a waste treatment facility the optimisation potential is representatively presented here.

Starting point

After the heating steam system, the evaporator system and other essential system components have been described exactly and the heating and cooling water balance has been set up, analysis and evaluation have been carried out. It should be noted in this case that the boiler is well dimensioned for the evaporator.

Optimisation with respect to characteristics of the existing system

The heat yield could be increased slightly by lowering the economizer outlet temperature a bit, but in this case damage to the jet filter could be done by doing so. That is due to possible drop below the acid dew point as waste oil was used as energy transmitter. During the winter season the heating system for the processing hall turns out to be relatively weakly dimensioned. Therefore, very simply, the hall doors must be kept closed. In addition the hall ventilation is to be reduced to the required (government-mandated) amount.

Results after an accurate analysis

The calculation shows that the power of the cooling tower can be further increased to about 220 kW. The operating system can be optimised through a better power control of the steam boiler system by adjusting the steam production to the current steam requirement. The heat demand for the office building could also be taken from the condenser of the evaporator system. The implementation, however, would require the installation of an enlarged heat exchanger.

Finally, it should be noted that energy costs can be reduced by a better adaptation of the electrical load management to the current operating requirements.

=> Energy project LOBBE with material flow diagramm

EnviCare® Engineering GmbH
engineering consultant for process technology

Eisteichgasse 20/36

8042 Graz, Austria
Tel. +43-316-381038-0 Fax+43-316-381038-9
e-mail: envicare@utanet.at

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