Parametric Study on the Dynamic Heat Storage Capacity of Building Elements

Nikolai Artmann, H. Manz, Per Heiselberg

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

758 Downloads (Pure)

Abstract

In modern, extensively glazed office buildings, due to high solar and internal loads and increased comfort expectations, air conditioning systems are often used even in moderate and cold climates. Particularly in this case, passive cooling by night-time ventilation seems to offer considerable potential. However, because heat gains and night ventilation periods do not coincide in time, a sufficient amount of thermal mass is needed in the building to store the heat. Assuming a 24 h-period harmonic oscillation of the indoor air temperature within a range of thermal comfort, the analytical solution of onedimensional heat conduction in a slab with convective boundary condition was applied to quantify the dynamic heat storage capacity of a particular building element. The impact of different parameters, such as slab thickness, material properties and the heat transfer coefficient was investigated, as well as their interrelation. The potential of increasing thermal mass by using phase change materials (PCM) was estimated assuming increased thermal capacity. The results show a significant impact of the heat transfer coefficient on heat storage capacity, especially for thick, thermally heavy elements. The storage capacity of a 100 mm thick concrete slab was found to increase with increasing heat transfer coefficients as high as 30 W/m2K. In contrast the heat storage capacity of a thin gypsum plaster board was found to be constant when the heat transfer coefficient exceeded 3 W/m2K. Additionally, the optimal thickness of an element depended greatly on the heat transfer coefficient. For thin, light elements a significant increase in heat capacity due to the use of PCMs was found to be possible. The present study shows the impact and interrelation of geometrical and physical parameters which appreciably influence the heat storage capacity of building elements.
Original languageEnglish
Title of host publication28th AIVC Conference : Crete, Island
Number of pages6
Publication date2007
Publication statusPublished - 2007
EventThe  AIVC Conference - Crete, Greece
Duration: 27 Sep 200729 Sep 2007
Conference number: 28

Conference

ConferenceThe  AIVC Conference
Number28
CountryGreece
CityCrete
Period27/09/200729/09/2007

Fingerprint

Heat storage
Heat transfer coefficients
Ventilation
Specific heat
Plaster
Phase change materials
Thermal comfort
Concrete slabs
Pulse code modulation
Office buildings
Heat conduction
Air conditioning
Loads (forces)
Materials properties
Boundary conditions
Cooling
Hot Temperature
Air
Temperature

Keywords

  • Ventilations
  • Air conditioning systems
  • Passive cooling
  • Thermal comfort

Cite this

Artmann, N., Manz, H., & Heiselberg, P. (2007). Parametric Study on the Dynamic Heat Storage Capacity of Building Elements. In 28th AIVC Conference: Crete, Island
Artmann, Nikolai ; Manz, H. ; Heiselberg, Per. / Parametric Study on the Dynamic Heat Storage Capacity of Building Elements. 28th AIVC Conference: Crete, Island. 2007.
@inproceedings{839aa240caab11dc8dd8000ea68e967b,
title = "Parametric Study on the Dynamic Heat Storage Capacity of Building Elements",
abstract = "In modern, extensively glazed office buildings, due to high solar and internal loads and increased comfort expectations, air conditioning systems are often used even in moderate and cold climates. Particularly in this case, passive cooling by night-time ventilation seems to offer considerable potential. However, because heat gains and night ventilation periods do not coincide in time, a sufficient amount of thermal mass is needed in the building to store the heat. Assuming a 24 h-period harmonic oscillation of the indoor air temperature within a range of thermal comfort, the analytical solution of onedimensional heat conduction in a slab with convective boundary condition was applied to quantify the dynamic heat storage capacity of a particular building element. The impact of different parameters, such as slab thickness, material properties and the heat transfer coefficient was investigated, as well as their interrelation. The potential of increasing thermal mass by using phase change materials (PCM) was estimated assuming increased thermal capacity. The results show a significant impact of the heat transfer coefficient on heat storage capacity, especially for thick, thermally heavy elements. The storage capacity of a 100 mm thick concrete slab was found to increase with increasing heat transfer coefficients as high as 30 W/m2K. In contrast the heat storage capacity of a thin gypsum plaster board was found to be constant when the heat transfer coefficient exceeded 3 W/m2K. Additionally, the optimal thickness of an element depended greatly on the heat transfer coefficient. For thin, light elements a significant increase in heat capacity due to the use of PCMs was found to be possible. The present study shows the impact and interrelation of geometrical and physical parameters which appreciably influence the heat storage capacity of building elements.",
keywords = "Ventilations, Air conditioning systems, Passive cooling, Thermal comfort",
author = "Nikolai Artmann and H. Manz and Per Heiselberg",
year = "2007",
language = "English",
booktitle = "28th AIVC Conference",

}

Artmann, N, Manz, H & Heiselberg, P 2007, Parametric Study on the Dynamic Heat Storage Capacity of Building Elements. in 28th AIVC Conference: Crete, Island. The  AIVC Conference, Crete, Greece, 27/09/2007.

Parametric Study on the Dynamic Heat Storage Capacity of Building Elements. / Artmann, Nikolai; Manz, H.; Heiselberg, Per.

28th AIVC Conference: Crete, Island. 2007.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

TY - GEN

T1 - Parametric Study on the Dynamic Heat Storage Capacity of Building Elements

AU - Artmann, Nikolai

AU - Manz, H.

AU - Heiselberg, Per

PY - 2007

Y1 - 2007

N2 - In modern, extensively glazed office buildings, due to high solar and internal loads and increased comfort expectations, air conditioning systems are often used even in moderate and cold climates. Particularly in this case, passive cooling by night-time ventilation seems to offer considerable potential. However, because heat gains and night ventilation periods do not coincide in time, a sufficient amount of thermal mass is needed in the building to store the heat. Assuming a 24 h-period harmonic oscillation of the indoor air temperature within a range of thermal comfort, the analytical solution of onedimensional heat conduction in a slab with convective boundary condition was applied to quantify the dynamic heat storage capacity of a particular building element. The impact of different parameters, such as slab thickness, material properties and the heat transfer coefficient was investigated, as well as their interrelation. The potential of increasing thermal mass by using phase change materials (PCM) was estimated assuming increased thermal capacity. The results show a significant impact of the heat transfer coefficient on heat storage capacity, especially for thick, thermally heavy elements. The storage capacity of a 100 mm thick concrete slab was found to increase with increasing heat transfer coefficients as high as 30 W/m2K. In contrast the heat storage capacity of a thin gypsum plaster board was found to be constant when the heat transfer coefficient exceeded 3 W/m2K. Additionally, the optimal thickness of an element depended greatly on the heat transfer coefficient. For thin, light elements a significant increase in heat capacity due to the use of PCMs was found to be possible. The present study shows the impact and interrelation of geometrical and physical parameters which appreciably influence the heat storage capacity of building elements.

AB - In modern, extensively glazed office buildings, due to high solar and internal loads and increased comfort expectations, air conditioning systems are often used even in moderate and cold climates. Particularly in this case, passive cooling by night-time ventilation seems to offer considerable potential. However, because heat gains and night ventilation periods do not coincide in time, a sufficient amount of thermal mass is needed in the building to store the heat. Assuming a 24 h-period harmonic oscillation of the indoor air temperature within a range of thermal comfort, the analytical solution of onedimensional heat conduction in a slab with convective boundary condition was applied to quantify the dynamic heat storage capacity of a particular building element. The impact of different parameters, such as slab thickness, material properties and the heat transfer coefficient was investigated, as well as their interrelation. The potential of increasing thermal mass by using phase change materials (PCM) was estimated assuming increased thermal capacity. The results show a significant impact of the heat transfer coefficient on heat storage capacity, especially for thick, thermally heavy elements. The storage capacity of a 100 mm thick concrete slab was found to increase with increasing heat transfer coefficients as high as 30 W/m2K. In contrast the heat storage capacity of a thin gypsum plaster board was found to be constant when the heat transfer coefficient exceeded 3 W/m2K. Additionally, the optimal thickness of an element depended greatly on the heat transfer coefficient. For thin, light elements a significant increase in heat capacity due to the use of PCMs was found to be possible. The present study shows the impact and interrelation of geometrical and physical parameters which appreciably influence the heat storage capacity of building elements.

KW - Ventilations

KW - Air conditioning systems

KW - Passive cooling

KW - Thermal comfort

M3 - Article in proceeding

BT - 28th AIVC Conference

ER -

Artmann N, Manz H, Heiselberg P. Parametric Study on the Dynamic Heat Storage Capacity of Building Elements. In 28th AIVC Conference: Crete, Island. 2007