Study the Effect of the Flow on the Performance of a shell and Tube Type Heat Exchanger Using Experimental Design Technique
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Abstract
In the current research an experimental study was done to show the effect of pulse flow on the
effectiveness of shell and tube type heat exchanger. the study was in the case of steady and pulse
flows with a changing mass flow rate of hot water flowing inside the pipes of the heat exchanger for
the range between (0.0273-0.0819 kg / s) at fix mass flow rate of cold water that flows through the
shell and on the outer surface of the pipes when (0.0416 kg / s), to obtain pulsing a used was
solenoid valve. The research aims to measure the percentage effect of independent factors which
were presenting the mass flow rate of hot water, flow type and the surrounding environment
conditions of the experimental side upon shell and tube type heat exchanger performance using
experimental design technique at the significant level (0.05).The results derived from the
experimental tests showed that pulse flow leads to increase internal heat transfer coefficient (hi)
comparing with its value in the steady flow and the highest increase was by (9.75%) at a mass flow
rate of hot water (0.0416 kg / s) and increases the overall heat transfer coefficient (U), where the
highest percentage was by )4.68%) at a mass flow rate of hot water (0.0416kg/s). The results also
showed increasing both the number of transmitted units (NTU) and the effectiveness of the shell
and tube type heat exchanger ( ) in the case of pulse flow of its value in the steady flow and the
highest percentage of increase occurring was (4.75%) and (1.85%), respectively, and at the mass
flow rate of hot water (0.0416 kg / s). Percentage effect of mass flow rate of hot water was (97%,
97.42%, 95.5%, 99.48%) and the percentage effect of each flow type and the errors were (2.8%,
2.25%, 2.44%, 0.4%) and (0. 2, 0.33%, 2.06%, 0.12) respectively.
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