New calculation method to solve moisture balance in the room with regenerator heat recovery and infiltration

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Resumé

The use of solar shading in future low energy office buildings is essential for minimizing energy consumption for building services, while maintaining thermal conditions. Implementing solar shading technologies in energy calculations and thermal building simulation programs is essential in order to demonstrate the effect of adaptive solar shading. Much literature covers the detailed description of solar shading in correlation with the glazing system. However in order to document the benefits of the shading technology, the description of the shading device in the thermal building simulation software must be described at a reasonably accurate level, related to the specific solar shading device. This research presents different approaches for modeling solar shading devices, demonstrating the level of accuracy in relation to full-scale measurements conducted at Aalborg University. Modeling of solar shading bridges the gap between increased complexity of solar shading technologies and the use of these technologies in thermal building simulation software.
OriginalsprogEngelsk
TidsskriftEnergy Procedia
Vol/bind132
Udgave nummerOctober 2017
Sider (fra-til)135-140
ISSN1876-6102
DOI
StatusUdgivet - 2017
Begivenhed11th Nordic Symposium on Building Physics - The Electro Building at Gløshaugen campus, NTNU, Trondheim, Norge
Varighed: 11 jun. 201714 jun. 2017
Konferencens nummer: 11
http://www.ntnu.edu/web/nsb2017/home
http://www.ntnu.edu/nsb2017

Konference

Konference11th Nordic Symposium on Building Physics
Nummer11
LokationThe Electro Building at Gløshaugen campus, NTNU
LandNorge
ByTrondheim
Periode11/06/201714/06/2017
Internetadresse

Fingerprint

Regenerators
Waste heat utilization
Infiltration
Moisture
Heat exchangers
Ventilation
Condensation
Atmospheric humidity
Air
Dilution
Evaporation

Emneord

  • Regenerator heat exchanger
  • Decentralized ventilation
  • Moisture balance
  • Condensation

Citer dette

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title = "New calculation method to solve moisture balance in the room with regenerator heat recovery and infiltration",
abstract = "This paper investigates moisture related performance of a regenerator heat exchanger located in a decentralized ventilation unit for residential building application. The decentralized ventilation solutions have recently become a more and more popular alternative to centralized ventilation systems. Due to the small space available and in order to avoid maintenance of these types of units, they are equipped with regenerator heat exchanger in some cases. In the recent past and also presently, Building Regulations (BR) and European directives have increased demands for heat recovery efficiency in air handling units (AHUs). In the case of regenerator heat exchanger, the higher the heat recovery efficiency obtained the higher risk that condensation might occur. This condensation might form small droplets on the surface of the regenerator that might not be possible to drain in the short switching time of the regenerator and consequently might be evaporated in the next cycle back to the building and cause elevated humidity conditions in the indoor spaces. Due to the fact that the traditionally used dilution equation must not be used to solve moisture balance in the room with regenerator heat exchanger and infiltration, this paper presents a new calculation methodology that takes into account infiltration, condensation in the regenerator, and back evaporation to the room. The paper compares humidity levels in the room ventilated with regenerator heat exchanger and ordinary counter-flow exchanger. Theoretical calculations indicate that the ability of a ventilation system with regenerator to remove moisture from the room is very dependent on moisture loads in the room, air change rate, and infiltration rate.",
keywords = "Regenerator heat exchanger, Decentralized ventilation, Moisture balance, Condensation, Regenerator heat exchanger, Decentralized ventilation, Moisture balance, Condensation",
author = "Pomianowski, {Michal Zbigniew} and Per Heiselberg and Christian Drivsholm",
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}

New calculation method to solve moisture balance in the room with regenerator heat recovery and infiltration. / Pomianowski, Michal Zbigniew; Heiselberg, Per; Drivsholm, Christian.

I: Energy Procedia, Bind 132, Nr. October 2017, 2017, s. 135-140.

Publikation: Bidrag til tidsskriftKonferenceartikel i tidsskriftForskningpeer review

TY - GEN

T1 - New calculation method to solve moisture balance in the room with regenerator heat recovery and infiltration

AU - Pomianowski, Michal Zbigniew

AU - Heiselberg, Per

AU - Drivsholm, Christian

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N2 - This paper investigates moisture related performance of a regenerator heat exchanger located in a decentralized ventilation unit for residential building application. The decentralized ventilation solutions have recently become a more and more popular alternative to centralized ventilation systems. Due to the small space available and in order to avoid maintenance of these types of units, they are equipped with regenerator heat exchanger in some cases. In the recent past and also presently, Building Regulations (BR) and European directives have increased demands for heat recovery efficiency in air handling units (AHUs). In the case of regenerator heat exchanger, the higher the heat recovery efficiency obtained the higher risk that condensation might occur. This condensation might form small droplets on the surface of the regenerator that might not be possible to drain in the short switching time of the regenerator and consequently might be evaporated in the next cycle back to the building and cause elevated humidity conditions in the indoor spaces. Due to the fact that the traditionally used dilution equation must not be used to solve moisture balance in the room with regenerator heat exchanger and infiltration, this paper presents a new calculation methodology that takes into account infiltration, condensation in the regenerator, and back evaporation to the room. The paper compares humidity levels in the room ventilated with regenerator heat exchanger and ordinary counter-flow exchanger. Theoretical calculations indicate that the ability of a ventilation system with regenerator to remove moisture from the room is very dependent on moisture loads in the room, air change rate, and infiltration rate.

AB - This paper investigates moisture related performance of a regenerator heat exchanger located in a decentralized ventilation unit for residential building application. The decentralized ventilation solutions have recently become a more and more popular alternative to centralized ventilation systems. Due to the small space available and in order to avoid maintenance of these types of units, they are equipped with regenerator heat exchanger in some cases. In the recent past and also presently, Building Regulations (BR) and European directives have increased demands for heat recovery efficiency in air handling units (AHUs). In the case of regenerator heat exchanger, the higher the heat recovery efficiency obtained the higher risk that condensation might occur. This condensation might form small droplets on the surface of the regenerator that might not be possible to drain in the short switching time of the regenerator and consequently might be evaporated in the next cycle back to the building and cause elevated humidity conditions in the indoor spaces. Due to the fact that the traditionally used dilution equation must not be used to solve moisture balance in the room with regenerator heat exchanger and infiltration, this paper presents a new calculation methodology that takes into account infiltration, condensation in the regenerator, and back evaporation to the room. The paper compares humidity levels in the room ventilated with regenerator heat exchanger and ordinary counter-flow exchanger. Theoretical calculations indicate that the ability of a ventilation system with regenerator to remove moisture from the room is very dependent on moisture loads in the room, air change rate, and infiltration rate.

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KW - Condensation

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KW - Moisture balance

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