Measuring Air Temperature in Glazed Ventilated Facades in the Presence of Direct Solar Radiation

Olena Kalyanova, Fabio Zanghirella, Per Heiselberg, Marco Perino, Rasmus Lund Jensen

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Resumé

A distinctive element of buildings with a double glazed façade is naturally or mechanically driven flow in a ventilated cavity. Accurate air temperature measurements in the cavity are crucial to evaluate the dynamic performance of the façade, to predict and control its behavior as a significant part of the complete ventilation system. Assessment of necessary cooling/heating loads and of the whole building energy performance will then depend on the accuracy of measured air temperature. The presence of direct solar radiation is an essential element for the façade operation, but it can heavily affect measurements of air temperature and may lead to errors of high magnitude using bare thermocouples and even adopting shielding devices. Two different research groups, from Aalborg University and Politecnico di Torino, tested separately various techniques to shield thermocouples from direct irradiance, in order to achieve an accurate and reliable way to measure the air temperature reducing the error caused by radiation. Experiments include bare thermocouple, naturally and mechanically ventilated shielded thermocouples, mechanically ventilated thermocouple with double shielding, silver coated thermocouples and screens. In both tests mechanically ventilated (single) shielding devices provide better results than naturally ventilated ones. A few of the best performing techniques were compared between two research groups and a comparison shows good agreement of the results.

OriginalsprogEngelsk
TitelProceedings of Roomvent 2007
RedaktørerOlli Seppänen, Jorma Säteri
Antal sider10
ForlagFINVAC ry
Publikationsdato2007
ISBN (Elektronisk)9789529989812
StatusUdgivet - 2007
BegivenhedThe International Conference on Air Distribution in Rooms, Roomvent - Helsinki, Finland
Varighed: 13 jun. 200715 jun. 2007
Konferencens nummer: 10

Konference

KonferenceThe International Conference on Air Distribution in Rooms, Roomvent
Nummer10
LandFinland
ByHelsinki
Periode13/06/200715/06/2007

Fingerprint

Facades
Thermocouples
Solar radiation
Air
Shielding
Temperature
Temperature measurement
Ventilation
Loads (forces)
Silver
Cooling
Radiation
Heating
Experiments

Bibliografisk note

PDF for print: 10 pp.

Emneord

  • Roomvent
  • The International Conference on Air Distribution in Rooms
  • Air Temperature
  • Glazed Ventilated Facades

Citer dette

Kalyanova, O., Zanghirella, F., Heiselberg, P., Perino, M., & Jensen, R. L. (2007). Measuring Air Temperature in Glazed Ventilated Facades in the Presence of Direct Solar Radiation. I O. Seppänen, & J. Säteri (red.), Proceedings of Roomvent 2007 FINVAC ry.
Kalyanova, Olena ; Zanghirella, Fabio ; Heiselberg, Per ; Perino, Marco ; Jensen, Rasmus Lund. / Measuring Air Temperature in Glazed Ventilated Facades in the Presence of Direct Solar Radiation. Proceedings of Roomvent 2007. red. / Olli Seppänen ; Jorma Säteri. FINVAC ry, 2007.
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abstract = "A distinctive element of buildings with a double glazed fa{\cc}ade is naturally or mechanically driven flow in a ventilated cavity. Accurate air temperature measurements in the cavity are crucial to evaluate the dynamic performance of the fa{\cc}ade, to predict and control its behavior as a significant part of the complete ventilation system. Assessment of necessary cooling/heating loads and of the whole building energy performance will then depend on the accuracy of measured air temperature. The presence of direct solar radiation is an essential element for the fa{\cc}ade operation, but it can heavily affect measurements of air temperature and may lead to errors of high magnitude using bare thermocouples and even adopting shielding devices. Two different research groups, from Aalborg University and Politecnico di Torino, tested separately various techniques to shield thermocouples from direct irradiance, in order to achieve an accurate and reliable way to measure the air temperature reducing the error caused by radiation. Experiments include bare thermocouple, naturally and mechanically ventilated shielded thermocouples, mechanically ventilated thermocouple with double shielding, silver coated thermocouples and screens. In both tests mechanically ventilated (single) shielding devices provide better results than naturally ventilated ones. A few of the best performing techniques were compared between two research groups and a comparison shows good agreement of the results.",
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Kalyanova, O, Zanghirella, F, Heiselberg, P, Perino, M & Jensen, RL 2007, Measuring Air Temperature in Glazed Ventilated Facades in the Presence of Direct Solar Radiation. i O Seppänen & J Säteri (red), Proceedings of Roomvent 2007. FINVAC ry, The International Conference on Air Distribution in Rooms, Roomvent, Helsinki, Finland, 13/06/2007.

Measuring Air Temperature in Glazed Ventilated Facades in the Presence of Direct Solar Radiation. / Kalyanova, Olena; Zanghirella, Fabio; Heiselberg, Per; Perino, Marco; Jensen, Rasmus Lund.

Proceedings of Roomvent 2007. red. / Olli Seppänen; Jorma Säteri. FINVAC ry, 2007.

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

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T1 - Measuring Air Temperature in Glazed Ventilated Facades in the Presence of Direct Solar Radiation

AU - Kalyanova, Olena

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AU - Heiselberg, Per

AU - Perino, Marco

AU - Jensen, Rasmus Lund

N1 - PDF for print: 10 pp.

PY - 2007

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N2 - A distinctive element of buildings with a double glazed façade is naturally or mechanically driven flow in a ventilated cavity. Accurate air temperature measurements in the cavity are crucial to evaluate the dynamic performance of the façade, to predict and control its behavior as a significant part of the complete ventilation system. Assessment of necessary cooling/heating loads and of the whole building energy performance will then depend on the accuracy of measured air temperature. The presence of direct solar radiation is an essential element for the façade operation, but it can heavily affect measurements of air temperature and may lead to errors of high magnitude using bare thermocouples and even adopting shielding devices. Two different research groups, from Aalborg University and Politecnico di Torino, tested separately various techniques to shield thermocouples from direct irradiance, in order to achieve an accurate and reliable way to measure the air temperature reducing the error caused by radiation. Experiments include bare thermocouple, naturally and mechanically ventilated shielded thermocouples, mechanically ventilated thermocouple with double shielding, silver coated thermocouples and screens. In both tests mechanically ventilated (single) shielding devices provide better results than naturally ventilated ones. A few of the best performing techniques were compared between two research groups and a comparison shows good agreement of the results.

AB - A distinctive element of buildings with a double glazed façade is naturally or mechanically driven flow in a ventilated cavity. Accurate air temperature measurements in the cavity are crucial to evaluate the dynamic performance of the façade, to predict and control its behavior as a significant part of the complete ventilation system. Assessment of necessary cooling/heating loads and of the whole building energy performance will then depend on the accuracy of measured air temperature. The presence of direct solar radiation is an essential element for the façade operation, but it can heavily affect measurements of air temperature and may lead to errors of high magnitude using bare thermocouples and even adopting shielding devices. Two different research groups, from Aalborg University and Politecnico di Torino, tested separately various techniques to shield thermocouples from direct irradiance, in order to achieve an accurate and reliable way to measure the air temperature reducing the error caused by radiation. Experiments include bare thermocouple, naturally and mechanically ventilated shielded thermocouples, mechanically ventilated thermocouple with double shielding, silver coated thermocouples and screens. In both tests mechanically ventilated (single) shielding devices provide better results than naturally ventilated ones. A few of the best performing techniques were compared between two research groups and a comparison shows good agreement of the results.

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KW - The International Conference on Air Distribution in Rooms

KW - Air Temperature

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M3 - Article in proceeding

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A2 - Seppänen, Olli

A2 - Säteri, Jorma

PB - FINVAC ry

ER -

Kalyanova O, Zanghirella F, Heiselberg P, Perino M, Jensen RL. Measuring Air Temperature in Glazed Ventilated Facades in the Presence of Direct Solar Radiation. I Seppänen O, Säteri J, red., Proceedings of Roomvent 2007. FINVAC ry. 2007