A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Development and Operation of Decentralized Ventilation for Indoor Climate and Energy Performance
The Danish government has targeted full reliance on renewable sources of energy for heating and electricity by 2035. Building renovations save energy and offset requirements for renewable supply. A Danish national action plan therefore expects to reduce heating consumption in existing buildings by at least 35% before 2050. Renovations improve airtightness and often require mechanical ventilation with heat recovery. The market will demand flexible costeffective ventilation solutions and the knowledge and competence for proper implementation. Single-room ventilation provides simple installation, low fan power, and the potential for local heat recovery. This research developed, assessed, and investigated two single-room ventilation units. One development yielded a novel short plastic rotary heat exchanger and another yielded a novel spiral plastic recuperative heat exchanger. Thermal theory guided the selection of a polycarbonate honeycomb rotor with small circular channels for the former and the selection of rolled plastic sheets with planar channels for the latter. Equations predicted their performance with dimensionless groups. Experiments quantified flows and determined temperature efficiencies at several ventilation rates. The methods accounted for heat gains and air leakages with measurements and balance equations. The measured and modelled temperature efficiencies showed adequate agreement for the rotary unit and exceeded 83% at 7.8 L/s. This result could not directly validate the model due to bypass leakage. All leakages were excessive and should be reduced with proper sealing. Experimental results demonstrated the option to reduce heat recovery by slowing rotational speed. Overall, the first development met preliminary objectives and provided a novel option for heat recovery. The development of the spiral recuperative heat exchanger provided encouraging first results. The heat exchanger provided a corrected supply temperature efficiency of 82.2% at 13.5 L/s. At this flow rate, the total measured pressure ...
Development and Operation of Decentralized Ventilation for Indoor Climate and Energy Performance
The Danish government has targeted full reliance on renewable sources of energy for heating and electricity by 2035. Building renovations save energy and offset requirements for renewable supply. A Danish national action plan therefore expects to reduce heating consumption in existing buildings by at least 35% before 2050. Renovations improve airtightness and often require mechanical ventilation with heat recovery. The market will demand flexible costeffective ventilation solutions and the knowledge and competence for proper implementation. Single-room ventilation provides simple installation, low fan power, and the potential for local heat recovery. This research developed, assessed, and investigated two single-room ventilation units. One development yielded a novel short plastic rotary heat exchanger and another yielded a novel spiral plastic recuperative heat exchanger. Thermal theory guided the selection of a polycarbonate honeycomb rotor with small circular channels for the former and the selection of rolled plastic sheets with planar channels for the latter. Equations predicted their performance with dimensionless groups. Experiments quantified flows and determined temperature efficiencies at several ventilation rates. The methods accounted for heat gains and air leakages with measurements and balance equations. The measured and modelled temperature efficiencies showed adequate agreement for the rotary unit and exceeded 83% at 7.8 L/s. This result could not directly validate the model due to bypass leakage. All leakages were excessive and should be reduced with proper sealing. Experimental results demonstrated the option to reduce heat recovery by slowing rotational speed. Overall, the first development met preliminary objectives and provided a novel option for heat recovery. The development of the spiral recuperative heat exchanger provided encouraging first results. The heat exchanger provided a corrected supply temperature efficiency of 82.2% at 13.5 L/s. At this flow rate, the total measured pressure ...
Development and Operation of Decentralized Ventilation for Indoor Climate and Energy Performance
Smith, Kevin Michael (author)
2015-01-01
Smith , K M 2015 , Development and Operation of Decentralized Ventilation for Indoor Climate and Energy Performance . Technical University of Denmark, Department of Civil Engineering .
Book
Electronic Resource
English
DDC:
690
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