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Case studies on local mixed convection heat transfer coefficients along a radiant heated wall subjected to displacement ventilation

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Abstract

As the demand for energy-efficient air conditioning systems enabling thermal comfort criteria increases, the research into innovative systems that combine displacement ventilation and radiant heating is being more up-to-date. This work discusses local mixed convection heat transfer coefficients over a radiant heated wall in an experimental room coupled with displacement ventilation provided by a floor level nozzle. In the experimental chamber, the air enters the room either from the floor level of the analyzed heated wall as in scenario 1 or the opposite wall in scenario 2 in the upward direction. The intervals of air inlet temperature and velocity are set between 13–27 °C and 0–2.5 ms−1, respectively. The obtained data have been analyzed from a physical point of view, and four correlations having R-sq. numbers of 0.93, 0.94, 0.94, and 0.98 have been developed for the local mixed convective heat transfer coefficients along a heated wall. The alterations of local convection heat transfer coefficients along an examined radiant heated wall affected by a slot diffuser delivering a lowest air inlet velocity of 0.5 ms−1 and highest air inlet velocity of 2.5 ms−1 are gained in the intervals of 2–5.8 Wm−2 K−1 and 2.5–10 W m−2 K−1, in turn.

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Abbreviations

A :

Area (m2)

ACH:

Air changes per hour (h−1)

BES:

Building energy simulation

CHT:

Convective heat transfer

CHTC:

Convective heat transfer coefficient

DV:

Displacement ventilation

Gr:

Grashof number

h :

Heat transfer coefficient (W m−2 K−1)

H :

Height of the examined wall (m)

HT:

Heat transfer

HTC:

Heat transfer coefficient

L :

Length (m)

\(\dot{m}\) :

Mass flow rate (kg s−1)

\(\dot{Q}\) :

Heat transfer rate (W)

Re:

Reynolds number

T :

Temperature (°C)

V :

Velocity (ms−1)

X :

Distance from the diffuser opening (m)

x :

Local vertical measurement point

Δ :

Difference

\(W\) :

Width of nozzle opening (m)

a:

Air

AUST:

Area-weighted temperature of inactive panel surfaces

c:

Convective

cn:

Natural convection

in:

Inlet

mid:

Vertical line at the midpoint of the chamber

out:

Outlet

r:

Radiative

ref:

Reference

s:

Surface

t:

Total

w:

Water

x:

Local

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Acknowledgements

This study has been financially supported by YTU Scientific Research Projects Coordination Department, Project ID: FCD-2022-5092.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Engineering Faculty, Siirt University, 56100, Siirt, Türkiye

    Muhammet Camci

  2. Department of Mechanical Engineering, Engineering Faculty, Hakkari University, 30000, Hakkari, Türkiye

    Yakup Karakoyun

  3. Department of Mechanical Engineering, Mechanical Engineering Faculty, Yildiz Technical University (YTU), 34349, Yildiz, Istanbul, Türkiye

    Muhammet Camci, Ozgen Acikgoz & Ahmet Selim Dalkilic

Authors
  1. Muhammet Camci
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  2. Yakup Karakoyun
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  3. Ozgen Acikgoz
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  4. Ahmet Selim Dalkilic
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Contributions

MC contributed to investigation, conceptualization, methodology, writing—original draft, writing—review and editing, visualization, and validation. YK contributed to methodology, writing—original draft, writing—review and editing, and validation. OA contributed to project administration, conceptualization, writing—original draft, writing—review and editing, and validation. ASD contributed to supervision, conceptualization, writing—original draft, writing—review and editing, and validation.

Corresponding author

Correspondence to Ozgen Acikgoz.

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Camci, M., Karakoyun, Y., Acikgoz, O. et al. Case studies on local mixed convection heat transfer coefficients along a radiant heated wall subjected to displacement ventilation. J Therm Anal Calorim 148, 7845–7854 (2023). https://doi.org/10.1007/s10973-023-12262-6

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  • DOI: https://doi.org/10.1007/s10973-023-12262-6

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