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Comparative Study of a Clean Technology Based on DSF Use in Occupied Buildings for Improving Comfort in Winter

Author

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  • Eusébio Conceição

    (Faculdade de Ciências e Tecnologia, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal)

  • João Gomes

    (CINTAL, Campus de Gambelas, 8005-139 Faro, Portugal)

  • Maria Manuela Lúcio

    (Faculdade de Ciências e Tecnologia, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal)

  • Maria Inês Conceição

    (Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)

  • Hazim Awbi

    (School of Construction Management & Engineering, University of Reading, Reading RG6 6AW, UK)

Abstract

This paper presents a comparative study of a clean technology based on a DSF (double skin facade) used in winter conditions in the occupied buildings comfort improvement, namely the thermal comfort and air quality. The performance of a solar DSF system, the building’s thermal response, the internal thermal comfort and the internal air quality are evaluated. In this study, a DSF system, an air transport system and a HVAC (heating, ventilating and air conditioning) system based on mixing ventilation are used. The study considers a virtual chamber occupied by eight persons and equipped, in the outside environment, by three DSFs. A new horary pre-programming control methodology is developed and applied when the airflow rate is constant and the number of DSFs to operate is variable, when the airflow rate is variable and the number of DSFs to operate is constant and when the airflow rate is variable and the number of DSFs to operate is variable. This work uses a numerical model that simulates the integral building thermal behavior and an integral human thermal response. The internal air, provided by a mixing ventilating system, is warmed using the DSF system. The air temperature inside the DSF system and the virtual chamber, the thermal comfort level using the PMV index, the internal air quality using the carbon dioxide concentration and the uncomfortable hours are calculated for winter conditions. The results obtained show that the energy produced in the DSF, using solar radiation, guarantees acceptable thermal comfort conditions in the morning and in the afternoon. The indoor air quality obtained at the breathing level is acceptable. It is found that the airflow rate to be used is more decisive than the DSF operating methodology. However, when a solution is chosen that combines a ventilation rate with the number of DSF to operate, both variables throughout the day can obtain simultaneously better results for indoor air quality and thermal comfort according to the standards.

Suggested Citation

  • Eusébio Conceição & João Gomes & Maria Manuela Lúcio & Maria Inês Conceição & Hazim Awbi, 2021. "Comparative Study of a Clean Technology Based on DSF Use in Occupied Buildings for Improving Comfort in Winter," Clean Technol., MDPI, vol. 3(2), pages 1-24, April.
    • Handle: RePEc:gam:jcltec:v:3:y:2021:i:2:p:18-334:d:528358
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    References listed on IDEAS

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    1. Zhang, Tiantian & Yang, Hongxing, 2019. "Flow and heat transfer characteristics of natural convection in vertical air channels of double-skin solar façades," Applied Energy, Elsevier, vol. 242(C), pages 107-120.
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