University of Twente Student Theses


HTHW temperature reduction

Coughlan, Darren (2010) HTHW temperature reduction.

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Abstract:The main research topic of this assignment was to determine whether or not the process in the brewery would run effectively if the temperature of the HTHW used to heat processes was reduced in temperature to below 105 degrees. The experience gained from this project would suggest that the temperature can certainly be reduced below 105 degrees. Perhaps the HTHW can be reduced further, even closer to 100 degrees if the right modifications are made to the process (particularly changes to the plate heat exchangers). The energy savings as a result of lowering the temperature of the HTHW have also been calculated. The reduction in heat losses from 120 degree HTHW to 104 degree has been estimated to be 1212 Gigajoules per year due to a lower ΔT between the water in the pipe and the surroundings. Assuming 9 euro per GJ it was possible to make an estimate of 11000 euro per year savings on energy costs in the brewery. If 100 degree water is used the savings will be even greater. The main objective of reducing the temperature of the HTHW was to eliminate the need for safety checks on the heat exchangers etc. these checks require external companies to come to the brewery and stop production (which is expensive) for a number of hours. It became obvious during the course of this research that the legislation states boilers which are subjected to temperatures above 110 degrees Celsius must be checked. In this case the brewery’s HTHW is already below the point of 110 degrees so perhaps it is not even necessary to reduce the temperature further. However certain equipment must be installed which ensures water above 110 degrees never passes through the equipment. The savings on safety checks which are determined by the Pressure Equipment Directive regulations are estimated to be about 2887 euro per year for the checks alone. This does not include the large money savings because production will not be stopped while the checks are performed. An investigation regarding the possibilities of solar water heating did not return such positive results. Using the gas price paid by Grolsch for the calculations I was able to estimate a payback period of about 30 years. The lifetime of such a system is expected to be 20-30 years at most so it is certainly not an attractive option. Keywords: Sustainability engineering, Process engineering, Temperature reduction, solar water heating,
Item Type:Internship Report (Master)
Grolsche Bierbrouwerij Nederland BV, Enschede
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Sustainable Energy Technology MSc (60443)
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