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3 ENERGY-EFFICIENT PROCESSES ABWÄRME the working fluids. A patent has been filed for this new equipment design. A prototype has been installed in the new pilot plant at ITTK. Heat transformer pilot plant A pilot plant with a useful heat flow of 4 kW was set up at KIT together with the necessary peripheral equipment and was tested over an extended peri- od of time. The absorber, desorber, evaporator, condenser and solvent he- at-exchanger are all configured as plate heat exchangers. The measurement data was evaluated and plotted using a LabView-based analysis program. The plant was operated with the working fluids water and [EMIM][OMs]. The temperature of the waste heat input stream was 95 °C, the temperature of the cooling water was 25 °C. The maximum temperature of the useful heat output achieved under these conditions was 135 °C. It was, however, not possible to conduct a detailed assessment of the performance of the new plate absorber as the pilot plant only allowed for variation of the mass and heat flows over a limited range. Experimental facility to examine the absorption and desorption stages in a falling film column Falling film columns with vertical tubes are well-established components in the field of process engineering. They are particularly useful when dea- ling with large mass-throughput systems. It therefore seemed worthwhile to examine a falling-film column as a possible alternative to the plate con- figurations used for the absorber and desorber stages. An experimental test facility was set up at a BASF technical centre and was operated with the wor- king fluid pairs water–[DEMA][OMs] and water–[EMIM][OMs]. Priority was given to measuring the absorption process, as the absorber contributes sig- nificantly more to overall cost. The measurement data was used to calculate thermal insulance values (also known as heat transfer resistance or thermal resistance) at a range of operating conditions. Economic feasibility Analysing the economic feasibility of the set-up based upon this one specific waste heat stream generated by a test plant at BASF proved challenging, as the particular circumstances and constraints applying in this one case study make it questionable whether the results could be generalised in a meaning- ful way. The economic feasibility study conducted by BASF was therefore not based on a specific case study, but was conducted for a generic applicati- on within the chemical and allied industries. The analysis was based on the following assumptions: • The waste heat is generated isothermally (with no initial information re- garding thermal power or temperature). 220PDF Image | Chemical Processes and Use of CO2
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