Abstract
A general study on heat transfer in dry packed beds is made, with special emphasis in comparing different transient models and in identifying the required conditions by which the attained results are equivalent. The differences in thermal behaviour on packed beds, when simultaneous heat mass transfer occurs as wet air is used as heat transfer fluid and exchanges heat and water with the solid in the bed, is analyzed. We modelize wet packed beds considering them as one dimension adsorbents beds, with dispersive and non-dispersive models, where adsorption, condensation-evaporation and liquid water downward flow from condensate phenomena are present. Models were solved numerically and experiments with a rock bed with dry and wet air through it, were made to test assumptions and to further understand the behavior of the system, obtaining a pretty good agreement between expected and measured profiles of the temperature evolution within the packed bed. As a possible application of the wet rock bed for storage purposes, a forced ventilation greenhouse was characterized as a wet air solar heater and analyzed the energetic potential of storing the heat that has to be rejected during daytime to control the crop ambient conditions, in a rock bed for later
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Ajona Maeztu, J I
[1]
- Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (CIEMAT), Madrid (Spain)
Citation Formats
Ajona Maeztu, J I.
Study on heat and mass transfer between a greenhouse considered as a solar air heater and a rock packed bed as ambient control system; Estudio de los intercambios de calor y masa entre un invernadero considerado como colector solar de aire humedo y un lecho de rocas como sistema de control ambiental.
Spain: N. p.,
1990.
Web.
Ajona Maeztu, J I.
Study on heat and mass transfer between a greenhouse considered as a solar air heater and a rock packed bed as ambient control system; Estudio de los intercambios de calor y masa entre un invernadero considerado como colector solar de aire humedo y un lecho de rocas como sistema de control ambiental.
Spain.
Ajona Maeztu, J I.
1990.
"Study on heat and mass transfer between a greenhouse considered as a solar air heater and a rock packed bed as ambient control system; Estudio de los intercambios de calor y masa entre un invernadero considerado como colector solar de aire humedo y un lecho de rocas como sistema de control ambiental."
Spain.
@misc{etde_10125376,
title = {Study on heat and mass transfer between a greenhouse considered as a solar air heater and a rock packed bed as ambient control system; Estudio de los intercambios de calor y masa entre un invernadero considerado como colector solar de aire humedo y un lecho de rocas como sistema de control ambiental}
author = {Ajona Maeztu, J I}
abstractNote = {A general study on heat transfer in dry packed beds is made, with special emphasis in comparing different transient models and in identifying the required conditions by which the attained results are equivalent. The differences in thermal behaviour on packed beds, when simultaneous heat mass transfer occurs as wet air is used as heat transfer fluid and exchanges heat and water with the solid in the bed, is analyzed. We modelize wet packed beds considering them as one dimension adsorbents beds, with dispersive and non-dispersive models, where adsorption, condensation-evaporation and liquid water downward flow from condensate phenomena are present. Models were solved numerically and experiments with a rock bed with dry and wet air through it, were made to test assumptions and to further understand the behavior of the system, obtaining a pretty good agreement between expected and measured profiles of the temperature evolution within the packed bed. As a possible application of the wet rock bed for storage purposes, a forced ventilation greenhouse was characterized as a wet air solar heater and analyzed the energetic potential of storing the heat that has to be rejected during daytime to control the crop ambient conditions, in a rock bed for later use at night for heating. (author).}
place = {Spain}
year = {1990}
month = {Dec}
}
title = {Study on heat and mass transfer between a greenhouse considered as a solar air heater and a rock packed bed as ambient control system; Estudio de los intercambios de calor y masa entre un invernadero considerado como colector solar de aire humedo y un lecho de rocas como sistema de control ambiental}
author = {Ajona Maeztu, J I}
abstractNote = {A general study on heat transfer in dry packed beds is made, with special emphasis in comparing different transient models and in identifying the required conditions by which the attained results are equivalent. The differences in thermal behaviour on packed beds, when simultaneous heat mass transfer occurs as wet air is used as heat transfer fluid and exchanges heat and water with the solid in the bed, is analyzed. We modelize wet packed beds considering them as one dimension adsorbents beds, with dispersive and non-dispersive models, where adsorption, condensation-evaporation and liquid water downward flow from condensate phenomena are present. Models were solved numerically and experiments with a rock bed with dry and wet air through it, were made to test assumptions and to further understand the behavior of the system, obtaining a pretty good agreement between expected and measured profiles of the temperature evolution within the packed bed. As a possible application of the wet rock bed for storage purposes, a forced ventilation greenhouse was characterized as a wet air solar heater and analyzed the energetic potential of storing the heat that has to be rejected during daytime to control the crop ambient conditions, in a rock bed for later use at night for heating. (author).}
place = {Spain}
year = {1990}
month = {Dec}
}