Experimental investigation of the influence of the air jet trajectory on convective heat transfer in buildings equipped with air-based and radiant cooling systems

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Abstract

The complexity and diversity of airflow in buildings make the accurate definition of convective heat transfer coefficients (CHTCs) difficult. In a full-scale test facility, the convective heat transfer of two cooling systems (active chilled beam and radiant wall) has been investigated under steady-state and dynamic conditions. With the air-based cooling system, a dependency of the convective heat transfer on the air jet trajectory has been observed. New correlations have been developed, introducing a modified Archimedes number to account for the air flow pattern. The accuracy of the new correlations has been evaluated to±15%. Besides the study with an air-based cooling system, the convective heat transfer with a radiant cooling system has also been investigated. The convective flow at the activated surface is mainly driven by natural convection. For other surfaces, the complexity of the flow and the large uncertainty on the CHTCs make the validation of existing correlations difficult.
Original languageEnglish
JournalJournal of Building Performance Simulation
Volume8
Issue number5
Pages (from-to) 312-325
Number of pages14
ISSN1940-1493
DOIs
Publication statusPublished - 2015

Fingerprint

Convective Heat Transfer
Cooling systems
Experimental Investigation
Cooling
Trajectories
Trajectory
Heat transfer
Air
Heat transfer coefficients
Heat Transfer Coefficient
Archimedes
Test facilities
Natural convection
Flow patterns
Natural Convection
Flow Pattern
Buildings
Influence
Uncertainty

Keywords

  • Convective heat transfer coefficient
  • Cooling
  • Radiant wall
  • Active chilled beam
  • Air jet trajectory
  • Archimedes number

Cite this

@article{e93e4584bdf64bb786d450a9aba76a7b,
title = "Experimental investigation of the influence of the air jet trajectory on convective heat transfer in buildings equipped with air-based and radiant cooling systems",
abstract = "The complexity and diversity of airflow in buildings make the accurate definition of convective heat transfer coefficients (CHTCs) difficult. In a full-scale test facility, the convective heat transfer of two cooling systems (active chilled beam and radiant wall) has been investigated under steady-state and dynamic conditions. With the air-based cooling system, a dependency of the convective heat transfer on the air jet trajectory has been observed. New correlations have been developed, introducing a modified Archimedes number to account for the air flow pattern. The accuracy of the new correlations has been evaluated to±15{\%}. Besides the study with an air-based cooling system, the convective heat transfer with a radiant cooling system has also been investigated. The convective flow at the activated surface is mainly driven by natural convection. For other surfaces, the complexity of the flow and the large uncertainty on the CHTCs make the validation of existing correlations difficult.",
keywords = "Convective heat transfer coefficient, Cooling, Radiant wall, Active chilled beam, Air jet trajectory, Archimedes number, Convective heat transfer coefficient, Cooling, Radiant wall, Active chilled beam, Air jet trajectory, Archimedes Number",
author = "{Le Dreau}, Jerome and Per Heiselberg and Jensen, {Rasmus Lund}",
year = "2015",
doi = "10.1080/19401493.2014.938121",
language = "English",
volume = "8",
pages = "312--325",
journal = "Journal of Building Performance Simulation",
issn = "1940-1493",
publisher = "Taylor & Francis",
number = "5",

}

TY - JOUR

T1 - Experimental investigation of the influence of the air jet trajectory on convective heat transfer in buildings equipped with air-based and radiant cooling systems

AU - Le Dreau, Jerome

AU - Heiselberg, Per

AU - Jensen, Rasmus Lund

PY - 2015

Y1 - 2015

N2 - The complexity and diversity of airflow in buildings make the accurate definition of convective heat transfer coefficients (CHTCs) difficult. In a full-scale test facility, the convective heat transfer of two cooling systems (active chilled beam and radiant wall) has been investigated under steady-state and dynamic conditions. With the air-based cooling system, a dependency of the convective heat transfer on the air jet trajectory has been observed. New correlations have been developed, introducing a modified Archimedes number to account for the air flow pattern. The accuracy of the new correlations has been evaluated to±15%. Besides the study with an air-based cooling system, the convective heat transfer with a radiant cooling system has also been investigated. The convective flow at the activated surface is mainly driven by natural convection. For other surfaces, the complexity of the flow and the large uncertainty on the CHTCs make the validation of existing correlations difficult.

AB - The complexity and diversity of airflow in buildings make the accurate definition of convective heat transfer coefficients (CHTCs) difficult. In a full-scale test facility, the convective heat transfer of two cooling systems (active chilled beam and radiant wall) has been investigated under steady-state and dynamic conditions. With the air-based cooling system, a dependency of the convective heat transfer on the air jet trajectory has been observed. New correlations have been developed, introducing a modified Archimedes number to account for the air flow pattern. The accuracy of the new correlations has been evaluated to±15%. Besides the study with an air-based cooling system, the convective heat transfer with a radiant cooling system has also been investigated. The convective flow at the activated surface is mainly driven by natural convection. For other surfaces, the complexity of the flow and the large uncertainty on the CHTCs make the validation of existing correlations difficult.

KW - Convective heat transfer coefficient

KW - Cooling

KW - Radiant wall

KW - Active chilled beam

KW - Air jet trajectory

KW - Archimedes number

KW - Convective heat transfer coefficient

KW - Cooling

KW - Radiant wall

KW - Active chilled beam

KW - Air jet trajectory

KW - Archimedes Number

U2 - 10.1080/19401493.2014.938121

DO - 10.1080/19401493.2014.938121

M3 - Journal article

VL - 8

SP - 312

EP - 325

JO - Journal of Building Performance Simulation

JF - Journal of Building Performance Simulation

SN - 1940-1493

IS - 5

ER -