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Performance analysis of a serrated absorber plate solar air heater with paraffin wax storage

  • Contemporary Advancement in Solar Energy Engineering
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Abstract

The study aims to examine the thermal performance of solar air heaters employing two different absorber plates under two different configurations. The experiments have been conducted in the summer climatic conditions of Moradabad City, India. A total of about 04 models of solar air heaters have been developed. The experimental investigation has been done using a flat-plate absorber and a serrated geometric absorber (with and without using the tested phase change material) to estimate the thermal performance. Notably, 03 different mass flow rates (i.e., 0.01 kg/s, 0.02 kg/s, and 0.03 kg/s) have been used to investigate the heat transfer coefficient, instantaneous efficiency, and daily efficiencies. Results of the study showed that Model-4 is the best among all the tested models that provide an average exhaust temperature of about 46 °C after sunset. The optimum daily average efficiency has been obtained at about 63% at 0.03 kg/s. The efficiency of a serrated plate-type SAH without using phase change material is about 23% higher than that of a conventional system, while it is about 19% higher than that of a conventional SAH using phase change material. Overall, the modified system is suitable for moderate-temperature applications, like agricultural drying and space heating.

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Data availability

Each data is provided in the manuscript.

Abbreviations

\({\Delta t}_{a}\) :

Inlet and outlet air temperature differences through the collectors (°C)

AC :

Cross-sectional area at the exit of collector (m2)

ṁ :

Mass flow rate/rates (MFR/MFRs) of air in kg/s

I :

Amount of solar radiation strikes on absorber in W/m2

\({T}_{p,av\mathrm{g}}\) :

The average temperature of the absorber plate in °C

\({T}_{p,av\mathrm{g}}\) :

Temperature of the air inside the heater on average in °C

mpcm :

Mass of PWS in (kg)

Cp ,s :

Specific heat of PWS before melting

abs:

Absorber

ν :

Kinematic viscosity (m2/s)

τ:

Transmissivity

f :

Frication factor

Q cv :

Convective heat transfer rate (W)

Re :

Reynolds number

TESM:

Thermal energy storage material

Δt m :

Logarithmic mean temperature, (K)

k:

Thermal conductivity, W/m.K

μ :

Dynamic viscosity of fluid, Pa

Va :

Velocity of air at the exit of system in m/s

\({\upeta }_{\mathrm{ins}}\) :

Instantaneous thermal efficiency (%)

\({\upeta }_{\mathrm{d}}\) :

Daily Efficiency (%)

Ap :

Air heater’s projected area in m2

ρ :

Air density (kg/m3)

h :

The coefficient of heat transfer of air in W/m2 °C

∆t:

Time interval (s)

Cp ,L :

Specific heat of PWS after melting

Qrd :

Rate of radiative heat transfer (W)

ht :

Heat transfer

M:

Mass (kg)

air:

Air inside collector

α:

Absorptivity

s:

Space between serrated fin, m

t:

Serrated fin thickness, m

∆P:

Pressure drop

Dh :

Equivalent diameter

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Authors and Affiliations

  1. Mechanical Engineering Department, Moradabad Institute of Technology, Moradabad, India

    Arvind Kumar Singh

  2. Mechanical Engineering Department, School of Engineering, Dev Bhoomi Uttarakhand University, Dehradun, India

    Abhishek Saxena

  3. Mechanical Engineering Department Shri Venkateshwara, University, Gajraula, India

    Nitin Agarwal

Authors
  1. Arvind Kumar Singh
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  2. Abhishek Saxena
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  3. Nitin Agarwal
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Contributions

Arvind Kumar Singh: Investigation, data curation, writing (original draft), validation.

Abhishek Saxena: Concept, resources, formal analysis, visualization, review and editing.

Nitin Agarwal: Direction, formal analysis, review and editing.

Corresponding author

Correspondence to Arvind Kumar Singh.

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Competing interests

The authors declare no competing interests.

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Responsible Editor: Philippe Garrigues

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Singh, A.K., Saxena, A. & Agarwal, N. Performance analysis of a serrated absorber plate solar air heater with paraffin wax storage. Environ Sci Pollut Res (2023). https://doi.org/10.1007/s11356-023-27961-8

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  • DOI: https://doi.org/10.1007/s11356-023-27961-8

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