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District Heating
What did GEA supply for the Lemgo project ?
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A CHP heat pump : GEA REDASTRUM HE , heat output sink 785KW at 82 ° C flow and source 560 kW at 63 ° C , COPline 3.2 , KM R717 ( ammonia );
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A pure water heat pump : GEA MX SP2VE6B ( RP ), heat output sink 2372 KW at 82 ° C flow and source 1600 kW at 15 ° C , COPline 2.7 , KM R717 ( ammonia ).
water heat pump ” could no longer continue to operate . The task now was to find a sustainable solution . Of the options considered , joint deliberations between Stadtwerke Lemgo and GEA rejected the possibility of an additional separating heat exchanger or the conversion of the heat pump and tube bundle evaporator with a complex self-cleaning system . The decision was made in favour of an additional filtration system , which was then implemented .
Remembering the environment The fact that the GEA heat pumps are also operated with the natural refrigerant ammonia is another plus point in terms of environmental protection . Ammonia is an inorganic compound of nitrogen and hydrogen , lighter than air and easily soluble in water . GEA is at the forefront of the development of technology solutions for natural refrigerants such as ammonia in order to achieve the environmental targets for phasing out the use of fluorinated gases ( F-gases ) and reducing emissions released into the atmosphere . The COP ( coefficient of performance ) of an ammonia heat pump operating under typical conditions for a district heating network or for process heat below 100 ° C , for example , is 40 % higher compared to synthetic refrigerants , which means 40 % fewer emissions , 40 % less energy and 40 % lower costs .
This district heating plant in Lemgo , Germany , provides a more environmentally friendly heat supply for the historic town . Photo courtesy of GEA / Tim Luhmann .
Celebrating a milestone Stadtwerke Lemgo is not yet satisfied with what it has achieved . They are already planning the next steps towards a CO 2
-neutral electricity and heat supply for the town : By 2028 , more than 55 percent of the district heating required is to be generated from renewable sources . The Lemgo team is relying on a large-scale solar thermal system , another large heat storage tank with an integrated PtH and air heat pump . These will be connected by direct cable to a wind turbine , which is also in the planning stage , in order to generate wind heat . In addition , a wind power plant will contribute to hydrogen production - further investments are planned in a biomass boiler and a wood gasification plant for roadside wood in order to achieve the goal of climate neutrality .
Heat pump specs GEA RedAstrum 2.0 : This second generation of screw compressor heat pumps offers an optimized design , a new ammonia cascade evaporator ( optional ) and an extended model range . The series is now available with seven screw compressor types based on the successful GEA Grasso M and GEA Grasso LT series in a specific high-pressure design .
The machine room with GEA heat pumps in the combined heat and power plant in Lemgo , Germany . Photo courtesy of GEA / Tim Luhmann .
www . heat-exchanger-world . com Heat Exchanger World April 2024
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