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Advanced decentralized ventilation systems for cooling and dehumidification with compact heat exchanger.

Number: pap. n. 122

Author(s) : KIM M. K., BALDINI L., LEIBUNDGUT H. J.

Summary

This paper discusses the use of decentralized supply air units for ventilation and dehumidification as a part of a LowEx building concept in tropical climates. The combination of decentralized ventilation with high temperature radiant cooling offers the potential for a very energy efficient operation of buildings in tropical climates and to decreases their exergy destruction. Specifically this study looks at the cooling and dehumidification performance of novel decentralized supply air units. These units are equipped with two heat exchangers arranged in series that are hydraulically connected in parallel. In the process of the air treatment the two heat exchangers take the roles of pre-cooling and cooling-dehumidification respectively. A theoretical model predicting the cooling and dehumidification performance of the two heat exchanger-setup has been put up. Also, measurements were carried out on a prototypical ventilation unit to assess its performance as well as to validate the theoretical calculations. The performance charts of enthalpy effectiveness and humidity-ratio effectiveness were used to present the results. Both, calculations and measurements show that higher cooling loads appear on the first heat exchanger, indicating that outside air is already partly condensed and a combined sensible and latent load is covered at this first stage. Further it was found that under Singapore conditions with high outside temperatures and large humidity levels, target humidity ratios around 8 g/kg in the supply air can be achieved with the current setup for an airflow rate of 45 m3/h.

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Pages: 10 p.

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Details

  • Original title: Advanced decentralized ventilation systems for cooling and dehumidification with compact heat exchanger.
  • Record ID : 30008666
  • Languages: English
  • Source: Clima 2013. 11th REHVA World Congress and 8th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings.
  • Publication date: 2013/06/16

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