Parameter study on performance of building cooling by night-time ventilation

Nikolai Artmann, H. Manz, Per Heiselberg

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

76 Citationer (Scopus)

Resumé

Especially for commercial buildings in moderate climates, night-time ventilation seems to be a simple and energy-efficient approach to improve thermal comfort in summer. However, due to uncertainties in the prediction of thermal comfort in buildings with night-time ventilation, architects and engineers are still hesitant to apply this technique. In order to reduce the uncertainties, the most important parameters affecting night ventilation performance need to be identified. A typical office room was therefore modelled using a building energy simulation programme (HELIOS), and the effect of different parameters such as building construction, heat gains, air change rates, heat transfer coefficients and climatic conditions including annual variations on the number of overheating degree hours (operative room temperature >26 °C) was evaluated. Climatic conditions and air flow rate during night-time ventilation were found to have the largest effect. But thermal mass and internal heat gains also have a significant effect on cooling performance and the achievable level of thermal comfort. Using this modelling approach, significant sensitivity to heat transfer was found only for total heat transfer coefficients below about 4 W/m2 K.
OriginalsprogEngelsk
TidsskriftRenewable Energy
Vol/bind33
Udgave nummer12
Sider (fra-til)2589-2598
Antal sider10
ISSN0960-1481
DOI
StatusUdgivet - 7 apr. 2008

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Ventilation
Thermal comfort
Cooling
Heat transfer coefficients
Air
Enthalpy
Flow rate
Heat transfer
Engineers
Hot Temperature
Temperature
Uncertainty

Citer dette

Artmann, Nikolai ; Manz, H. ; Heiselberg, Per. / Parameter study on performance of building cooling by night-time ventilation. I: Renewable Energy. 2008 ; Bind 33, Nr. 12. s. 2589-2598.
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abstract = "Especially for commercial buildings in moderate climates, night-time ventilation seems to be a simple and energy-efficient approach to improve thermal comfort in summer. However, due to uncertainties in the prediction of thermal comfort in buildings with night-time ventilation, architects and engineers are still hesitant to apply this technique. In order to reduce the uncertainties, the most important parameters affecting night ventilation performance need to be identified. A typical office room was therefore modelled using a building energy simulation programme (HELIOS), and the effect of different parameters such as building construction, heat gains, air change rates, heat transfer coefficients and climatic conditions including annual variations on the number of overheating degree hours (operative room temperature >26 °C) was evaluated. Climatic conditions and air flow rate during night-time ventilation were found to have the largest effect. But thermal mass and internal heat gains also have a significant effect on cooling performance and the achievable level of thermal comfort. Using this modelling approach, significant sensitivity to heat transfer was found only for total heat transfer coefficients below about 4 W/m2 K.",
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Parameter study on performance of building cooling by night-time ventilation. / Artmann, Nikolai; Manz, H.; Heiselberg, Per.

I: Renewable Energy, Bind 33, Nr. 12, 07.04.2008, s. 2589-2598.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Parameter study on performance of building cooling by night-time ventilation

AU - Artmann, Nikolai

AU - Manz, H.

AU - Heiselberg, Per

PY - 2008/4/7

Y1 - 2008/4/7

N2 - Especially for commercial buildings in moderate climates, night-time ventilation seems to be a simple and energy-efficient approach to improve thermal comfort in summer. However, due to uncertainties in the prediction of thermal comfort in buildings with night-time ventilation, architects and engineers are still hesitant to apply this technique. In order to reduce the uncertainties, the most important parameters affecting night ventilation performance need to be identified. A typical office room was therefore modelled using a building energy simulation programme (HELIOS), and the effect of different parameters such as building construction, heat gains, air change rates, heat transfer coefficients and climatic conditions including annual variations on the number of overheating degree hours (operative room temperature >26 °C) was evaluated. Climatic conditions and air flow rate during night-time ventilation were found to have the largest effect. But thermal mass and internal heat gains also have a significant effect on cooling performance and the achievable level of thermal comfort. Using this modelling approach, significant sensitivity to heat transfer was found only for total heat transfer coefficients below about 4 W/m2 K.

AB - Especially for commercial buildings in moderate climates, night-time ventilation seems to be a simple and energy-efficient approach to improve thermal comfort in summer. However, due to uncertainties in the prediction of thermal comfort in buildings with night-time ventilation, architects and engineers are still hesitant to apply this technique. In order to reduce the uncertainties, the most important parameters affecting night ventilation performance need to be identified. A typical office room was therefore modelled using a building energy simulation programme (HELIOS), and the effect of different parameters such as building construction, heat gains, air change rates, heat transfer coefficients and climatic conditions including annual variations on the number of overheating degree hours (operative room temperature >26 °C) was evaluated. Climatic conditions and air flow rate during night-time ventilation were found to have the largest effect. But thermal mass and internal heat gains also have a significant effect on cooling performance and the achievable level of thermal comfort. Using this modelling approach, significant sensitivity to heat transfer was found only for total heat transfer coefficients below about 4 W/m2 K.

KW - Passive cooling

KW - Night-time ventilation

KW - Parameter study

KW - Thermal mass

KW - Heat transfer

KW - Climate

U2 - doi:10.1016/j.renene.2008.02.025

DO - doi:10.1016/j.renene.2008.02.025

M3 - Journal article

VL - 33

SP - 2589

EP - 2598

JO - Renewable Energy

JF - Renewable Energy

SN - 0960-1481

IS - 12

ER -