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Optimum Performance of Radiator Space Heating Systems Connected to District Heating Networks

Optimum Performance of Radiator Space Heating Systems Connected to District Heating Networks via Heat Exchangers Patrick Ljunggren, Janusz Wollerstrand & Svend Frederiksen Lund Institute of Technology Department of Energy Sciences Sweden. Topics.

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Optimum Performance of Radiator Space Heating Systems Connected to District Heating Networks

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  1. Optimum Performance of Radiator Space Heating Systems Connected to District Heating Networks via Heat Exchangers Patrick Ljunggren, Janusz Wollerstrand & Svend Frederiksen Lund Institute of Technology Department of Energy Sciences Sweden

  2. Topics • Consequences of ‘oversizing’ radiators (RADs) & Heat EXchangers (HEXs) • Various RAD circuit control methods • Constant or variable RAD circuit flow • Various methods of upsizing HEXs • ?? ºC lower DH return temperature

  3. Minimum primary return temperature, tr1, at altered radiator supply temp., trf, for increasing HEX area

  4. Mode with excessive indoor air heating, simulated instantaneous temperatures space heating system 100 % oversized

  5. Standard temperature program (constant flow) and optimized program (variable flow) no oversizing of radiators or heat exchanger

  6. Lowered supply temperature set-point curve & unchanged flowrate (full curves) and optimized program (variable flow, dashed curves). 100% over-sized radiators and heat exchanger

  7. Low flow balancing (design supply temperature, full curve, and reduced flow, dashed curves) 100% over-sized radiators and heat exchanger

  8. Difference (in °C) in annual weighted return temperature from space heating heat exchanger versus reference case with a return temperature of 44.9 °C

  9. Primary return temperature and secondary supply temperature at design heat load, assuming optimal radiator circuit flowrate (four different assumptions)

  10. Conclusions Radiator control should be optimised to minimise primary return temperature By combining control optimisation & HEX up-sizing gains in primary return of around 10ºC are possible

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