Innovativt 2-rørsbaffelsystem til såvel køling som opvarmning af bygninger
Using a room-temperature loop with supply water temperature of about 22°C, together with active beams, enabled the 2PS to meet room temperature set-points even though, simultaneously, some rooms required heating whereas others required cooling. The use of Modelica made it possible to develop a detailed and comprehensive energy and control model of the system. Simulation results showed that the two-pipe system was able to use less energy than the four-pipe system due to three effects: useful heat transfer from warm to cold zones, higher free cooling potential and higher efficiency of the heat pump. The following conclusions can be drawn:
- Due to the room-temperature loop layout, heat was transferred from the core zone to the perimeter zones. When considering only the energy use for space heating and cooling, savings between of approximately 21% occurred.
-Due to the higher supply water temperature in cooling mode, the dry cooler in the two-pipe system was able to remove more heat than the dry cooler in the four-pipe system. Inparticular, the dry cooler in the two-pipe system removed approximately between 70% of cooling demand versus approximately 33% in the four-pipe system.
- Due to the lower supply water temperature in heating mode, the heat pump in the two-pipe system achieved a value of the HSPF 48% higher than the heat pump in the four-pipe system. This allowed for a significant reduction of primary energy use for space heating.
- When comparing the total annual primary energy use, the two-pipe system used approximately 18% less total primary energy (including ventilation) per year than the four-pipe system.
- The controller for the regulation of the supply water temperature was able to meet heating and cooling set-points in all the five rooms.
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Partner | Tilskud | Eget bidrag |
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Lindab A/S |