Open Access

ARTICLE

PERFORMANCE ANALYSIS OF LONGITUDINAL FIN JET PLATE SOLAR AIR HEATER UNDER CROSS FLOW CONDITION

Rajen Kumar Nayak^a,* , Ravi Shankar Prasad^a,† , Ujjwal Kumar Nayak^a, Amit Kumar Gupta^b

a Department of Mechanical Engineering, B.I.T. Sindri, Dhanbad, Jharkhand, PIN 828123, India
b Department of Chemical Engineering, B.I.T. Sindri, Dhanbad, Jharkhand, PIN 828123, India
* Department of Mechanical Engineering, B.I.T. Sindri, Dhanbad, Jharkhand, PIN 828123, India
† Corresponding author. Email: rsprasad.me@bitsindri.ac.in

Frontiers in Heat and Mass Transfer 2022, 19, 1-12. https://doi.org/10.5098/hmt.19.22

Abstract

The present experimental work has been carried out for a solar air heater under cross flow condition having inline hole jet plate between bottom plate and absorber plate with longitudinal fins underside the absorber surface. The performance of this inline hole jet plate solar air heater is compared with the performance of jet plate solar air heaters without longitudinal fins under cross and non-cross flow conditions for similar geometrical and operational parameters. Results are presented for mass flow rates of air, ṁ₁ = 0.020 - 0.070 kg/sec, ṁ₂ = 0.018 - 0.041 kg/sec, flow Reynolds number, Re_ja2 = 2000 - 8000, jet hole diameter, D = 6.0 mm, number of jet hole, N = 561, depth of bottom and upper channel, Z₁ = 7.0 cm, Z₂ = 7.0 cm, total air depth, Z = 14.0 cm, pitch of the fins, p = 5.0 cm, total number of fins, N_f = 20, height of fins, L_f = 12.0 mm, thickness of fins, δ_f = 3.0 mm and tilt angle, θ = 22.6o . The experiment is performed during the winter season at IIT (ISM) Dhanbad, Jharkhand, India between 09:00 AM – 03:00 PM on hourly basis. The present investigation shows that the jet plate with longitudinal fins is more efficient than cross and non-cross flow jet plate solar air heater. The mass flow rates of air ṁ1 and ṁ2 substantially influences the collector efficiency, heat transfer coefficient and Nusselt number. Based on the experimental data, the empirical correlations for Nusselt number, friction factor and fin effectiveness have been developed.

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