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Evaluating the metallographic properties and performance of heat transfer by natural convection of graphene-coated glass used for heating

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Abstract

In this study, a decorative electric heater was manufactured to reduce carbon emissions related to residential and office heating, and this heater was metallographically evaluated. In addition, the heating performance of the manufactured plate was investigated by examining its heat transfer capacity by natural convection. For this purpose, the surface of the tempered glass plate was coated with graphene by spraying to improve its electrical and heat conduction properties. Copper strips were attached to both sides of the plate to allow for an electric current. The plate was connected to mains electricity, and its change in surface temperature over time was measured. Using the measured temperature values, the heat transfer rate by natural convection on the plate surface was calculated. As a result of the calculations, it was determined that the graphene-coated tempered glass plate reached a heating performance of 40 watts after 2400 s of electrical energy supply. This value can be increased by increasing the heat transfer surface area. This study, taking advantage of the excellent thermophysical properties of graphene, will contribute to other studies conducted in this field.

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Abbreviations

T :

Time (s)

CF:

Carbon fiber

COP:

Coefficient of performance

SEM:

Scanning-Electron Microscope

EDS:

Energy Dispersive Spectrum

T s :

Plate surface temperature (°C)

T ∞ :

Ambient air temperature (°C)

T mean :

Average temperature (°C, K)

k :

Coefficient of thermal conductivity (W/m−1 K−1)

ρ :

Density (kg m−3)

c :

Specific heat (J kg−1K−1)

β :

Of volume expansion (K−1)

L c :

Length (m)

H :

Transfer coefficient (W m−2 K−1)

A s :

Heat transfer surface area (m2)

G :

Acceleration (m s−2)

Q convection :

Transfer amount (W)

Nu:

Number

Gr:

Number

Ra:

Number

Pr:

Number

ϑ :

Viscosity (m2 s−1)

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Authors and Affiliations

  1. Department of Mechanical Engineering, Munzur University, 62000, Tunceli, Turkey

    Gökhan Kahraman & Yahya Taşgın

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  1. Gökhan Kahraman
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  2. Yahya Taşgın
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Correspondence to Gökhan Kahraman.

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Kahraman, G., Taşgın, Y. Evaluating the metallographic properties and performance of heat transfer by natural convection of graphene-coated glass used for heating. J Therm Anal Calorim 149, 1231–1238 (2024). https://doi.org/10.1007/s10973-023-12748-3

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  • DOI: https://doi.org/10.1007/s10973-023-12748-3

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