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Control components for DHW preparation by heat exchanger

Control components for DHW preparation by heat exchanger. M.Sc. Jan Eric Thorsen Application Center Danfoss A/S District Heating Controls. 1. Example multifunctional controller. 2. Why multifunctional controller ?. One controller Space savings Reduced assembly costs

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Control components for DHW preparation by heat exchanger

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  1. Control components for DHW preparation by heat exchanger M.Sc. Jan Eric Thorsen Application Center Danfoss A/S District Heating Controls 1

  2. Example multifunctional controller 2

  3. Why multifunctional controller ? • One controller • Space savings • Reduced assembly costs • Flexible functionality 3

  4. T DH DHW The ”optimum” control concept depends on: • Primary supply condition • Demand to control performance • Demand to functionalities 4

  5. Primary supply conditions Q1 ; T11 = 60-100°C T T22 = 45 - 55°C dP = 0.5 to 6 bar Q2 = 0-0,2 l/s; T21 = 10°C T12 = 15-25°C 5

  6. Functionalities / Control performance • Idle temperature (at no DHW tapping) • DHW Circulation • Priority function DHW/Heating 6

  7. Q1 T Q2 Q2 Basic control components Thermostatic controller Proportional flow controller Differential Pressure controller 7

  8. Q1 T Q2 Thermostatic controller 8

  9. Q1 T Q2 Thermostatic controller 9

  10. Q2 Proportional flow controller PM controller 11

  11. T Q2 Proportional flow controller with a temperature controller serial connected PTC controller 11

  12. DH Flow DCW T DHW Heating flow DH Return Heating return Temperature controller parallel connected with proportional controller plus dP controller AVTI Controller 12

  13. Example AVTI controller 13

  14. T Other combinations Heating flow T T Heating return Therm. control with reduced stand by temperature control and DHW priority Combined therm. and prop. control (reduced stand by temp.) 14

  15. Thermostatic variants T T Therm. controller with “special” position of sensor Therm. controller with “Heat Bridge” AVTB with Gemina Heat bridge 15

  16. Recommendations: Proportional controller: Thermostatic controller: • constant dP and T11, or accept seasonal adjusting • ”free” setting of stand-by temperature • - (additional thermostatic controller) • Preventing high temperature peaks • - (preventing lime scale deposits) • variable dP and T11 • comfort of high standby temperature 16

  17. Recommendations: Serial coupling: Parallel coupling: • variable T11, variable dP • control performance • ”free” setting of stand-by temperature • - (additional thermostatic controller) • variable T11, but constant dP • control performance • comfort of high standby temperature 17

  18. Trend within compact DHW/H sub stations: • Towards compact multifunctional controllers • Fulfilling specific demands > flexibility 18

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