Compilation of publication and results from project C2

Modelling of microclimate in collectors.

Ole Holck

    Research output: Book/ReportReportResearchpeer-review

    Abstract

    It is important to avoid condensation in solar collectors, most of all because wetness of the absorber can damage the selective surface and cause corrosion on the absorber plate.During night time the cover of collectors will cool below ambient temperature due to thermal radiation to the cold sky. In climates where the air during night time becomes saturated with humidity (the relative humidity is 100%), condensation will form on the outside and inside of the collector glazing. If too much condensation takes place on the inside of the glazing, it will start to fall off on to the absorber surface.The intent of the present work is improvement of a existing computer model for calculation of microclimate data in collectors.Calculations with the model give insight in the humidity and temperature for artificial or realistic climatic data. This design tool makes it possible to calculate the effect of ventilation and insulation materials.Results from investigation of ventilation rates together with a model of the moisture inside the collector are built into the computer program. It has been found that modelling of the moisture transfer in backside insulation is essential to determine the humidity in the air gap of the collector.The objective is to develop guidelines for solar collector design to achieve the most favourable microclimate condition for materials. As a tool the computer model will be useful to fulfil this. Guidelines for collectors will be essential for manufactures to improve the long-term durability of solar collectors.
    Original languageEnglish
    Number of pages55
    Publication statusPublished - 1999
    EventEuroSun '98 - Portoros, Slovenia
    Duration: 14 Sep 199817 Sep 1998

    Conference

    ConferenceEuroSun '98
    CountrySlovenia
    CityPortoros
    Period14/09/199817/09/1998

    Cite this

    @book{80dd88e88f2e424198b3c66d012bd22e,
    title = "Compilation of publication and results from project C2: Modelling of microclimate in collectors.",
    abstract = "It is important to avoid condensation in solar collectors, most of all because wetness of the absorber can damage the selective surface and cause corrosion on the absorber plate.During night time the cover of collectors will cool below ambient temperature due to thermal radiation to the cold sky. In climates where the air during night time becomes saturated with humidity (the relative humidity is 100{\%}), condensation will form on the outside and inside of the collector glazing. If too much condensation takes place on the inside of the glazing, it will start to fall off on to the absorber surface.The intent of the present work is improvement of a existing computer model for calculation of microclimate data in collectors.Calculations with the model give insight in the humidity and temperature for artificial or realistic climatic data. This design tool makes it possible to calculate the effect of ventilation and insulation materials.Results from investigation of ventilation rates together with a model of the moisture inside the collector are built into the computer program. It has been found that modelling of the moisture transfer in backside insulation is essential to determine the humidity in the air gap of the collector.The objective is to develop guidelines for solar collector design to achieve the most favourable microclimate condition for materials. As a tool the computer model will be useful to fulfil this. Guidelines for collectors will be essential for manufactures to improve the long-term durability of solar collectors.",
    author = "Ole Holck",
    year = "1999",
    language = "English",

    }

    Compilation of publication and results from project C2 : Modelling of microclimate in collectors. / Holck, Ole.

    1999. 55 p.

    Research output: Book/ReportReportResearchpeer-review

    TY - RPRT

    T1 - Compilation of publication and results from project C2

    T2 - Modelling of microclimate in collectors.

    AU - Holck, Ole

    PY - 1999

    Y1 - 1999

    N2 - It is important to avoid condensation in solar collectors, most of all because wetness of the absorber can damage the selective surface and cause corrosion on the absorber plate.During night time the cover of collectors will cool below ambient temperature due to thermal radiation to the cold sky. In climates where the air during night time becomes saturated with humidity (the relative humidity is 100%), condensation will form on the outside and inside of the collector glazing. If too much condensation takes place on the inside of the glazing, it will start to fall off on to the absorber surface.The intent of the present work is improvement of a existing computer model for calculation of microclimate data in collectors.Calculations with the model give insight in the humidity and temperature for artificial or realistic climatic data. This design tool makes it possible to calculate the effect of ventilation and insulation materials.Results from investigation of ventilation rates together with a model of the moisture inside the collector are built into the computer program. It has been found that modelling of the moisture transfer in backside insulation is essential to determine the humidity in the air gap of the collector.The objective is to develop guidelines for solar collector design to achieve the most favourable microclimate condition for materials. As a tool the computer model will be useful to fulfil this. Guidelines for collectors will be essential for manufactures to improve the long-term durability of solar collectors.

    AB - It is important to avoid condensation in solar collectors, most of all because wetness of the absorber can damage the selective surface and cause corrosion on the absorber plate.During night time the cover of collectors will cool below ambient temperature due to thermal radiation to the cold sky. In climates where the air during night time becomes saturated with humidity (the relative humidity is 100%), condensation will form on the outside and inside of the collector glazing. If too much condensation takes place on the inside of the glazing, it will start to fall off on to the absorber surface.The intent of the present work is improvement of a existing computer model for calculation of microclimate data in collectors.Calculations with the model give insight in the humidity and temperature for artificial or realistic climatic data. This design tool makes it possible to calculate the effect of ventilation and insulation materials.Results from investigation of ventilation rates together with a model of the moisture inside the collector are built into the computer program. It has been found that modelling of the moisture transfer in backside insulation is essential to determine the humidity in the air gap of the collector.The objective is to develop guidelines for solar collector design to achieve the most favourable microclimate condition for materials. As a tool the computer model will be useful to fulfil this. Guidelines for collectors will be essential for manufactures to improve the long-term durability of solar collectors.

    M3 - Report

    BT - Compilation of publication and results from project C2

    ER -