Sensitivity analysis of the thermal performance of radiant and convective terminals for cooling buildings

J. Le Dréau, P. Heiselberg

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

27 Citationer (Scopus)

Resumé

Heating and cooling terminals can be classified in two main categories: convective terminals (e.g. active chilled beam, air conditioning) and radiant terminals. The mode of heat transfer of the two emitters is different: the first one is mainly based on convection, whereas the second one is based on both radiation and convection. In order to characterise the advantages and drawbacks of the different terminals, steady-state simulations of a typical office room have been performed using four types of terminals (active chilled beam, radiant floor, wall and ceiling). A sensitivity analysis has been conducted to determine the parameters influencing their thermal performance the most. The air change rate, the outdoor temperature and the air temperature stratification have the largest effect on the cooling need (maintaining a constant operative temperature). For air change rates higher than 0.5 ACH, differences between terminals can be observed. Due to their higher dependency on the air change rate and outdoor temperature, convective terminals are generally less energy effective than radiant terminals. The global comfort level achieved by the different systems is always within the recommended range, but differences have been observed in the uniformity of comfort.
OriginalsprogEngelsk
TidsskriftEnergy and Buildings
Vol/bind82
Udgave nummerOctober 2014
Sider (fra-til)482–491
Antal sider10
ISSN0378-7788
DOI
StatusUdgivet - 2014

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Sensitivity analysis
Cooling
Air
Temperature
Ceilings
Air conditioning
Heat transfer
Radiation
Heating
Hot Temperature
Convection

Emneord

  • Floor cooling
  • Cooled wall
  • Cooled ceiling
  • Active chilled beam
  • Emitters
  • Sensitivity analysis
  • Cooling need
  • Convective heat transfer coefficient
  • Air temperature stratification
  • Comfort

Citer dette

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Sensitivity analysis of the thermal performance of radiant and convective terminals for cooling buildings. / Le Dréau, J.; Heiselberg, P.

I: Energy and Buildings, Bind 82, Nr. October 2014, 2014, s. 482–491.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Sensitivity analysis of the thermal performance of radiant and convective terminals for cooling buildings

AU - Le Dréau, J.

AU - Heiselberg, P.

PY - 2014

Y1 - 2014

N2 - Heating and cooling terminals can be classified in two main categories: convective terminals (e.g. active chilled beam, air conditioning) and radiant terminals. The mode of heat transfer of the two emitters is different: the first one is mainly based on convection, whereas the second one is based on both radiation and convection. In order to characterise the advantages and drawbacks of the different terminals, steady-state simulations of a typical office room have been performed using four types of terminals (active chilled beam, radiant floor, wall and ceiling). A sensitivity analysis has been conducted to determine the parameters influencing their thermal performance the most. The air change rate, the outdoor temperature and the air temperature stratification have the largest effect on the cooling need (maintaining a constant operative temperature). For air change rates higher than 0.5 ACH, differences between terminals can be observed. Due to their higher dependency on the air change rate and outdoor temperature, convective terminals are generally less energy effective than radiant terminals. The global comfort level achieved by the different systems is always within the recommended range, but differences have been observed in the uniformity of comfort.

AB - Heating and cooling terminals can be classified in two main categories: convective terminals (e.g. active chilled beam, air conditioning) and radiant terminals. The mode of heat transfer of the two emitters is different: the first one is mainly based on convection, whereas the second one is based on both radiation and convection. In order to characterise the advantages and drawbacks of the different terminals, steady-state simulations of a typical office room have been performed using four types of terminals (active chilled beam, radiant floor, wall and ceiling). A sensitivity analysis has been conducted to determine the parameters influencing their thermal performance the most. The air change rate, the outdoor temperature and the air temperature stratification have the largest effect on the cooling need (maintaining a constant operative temperature). For air change rates higher than 0.5 ACH, differences between terminals can be observed. Due to their higher dependency on the air change rate and outdoor temperature, convective terminals are generally less energy effective than radiant terminals. The global comfort level achieved by the different systems is always within the recommended range, but differences have been observed in the uniformity of comfort.

KW - Floor cooling

KW - Cooled wall

KW - Cooled ceiling

KW - Active chilled beam

KW - Emitters

KW - Sensitivity analysis

KW - Cooling need

KW - Convective heat transfer coefficient

KW - Air temperature stratification

KW - Comfort

KW - Floor cooling

KW - Cooled wall

KW - Cooled ceiling

KW - Active chilled beam

KW - Emitters

KW - Sensitivity analysis

KW - Cooling need

KW - Convective heat transfer coefficient

KW - Air temperature stratification

KW - Comfort

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JO - Energy and Buildings

JF - Energy and Buildings

SN - 0378-7788

IS - October 2014

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