Abstract
This research aimed to present an experiment-numerical method modifying the mathematic model of Heat Pipe Heat Exchanger (HPHE) in term of NTU-Effectiveness relation. HPHE comprised of 13 vertical-staggered heat pipes 12.7 mm stainless steel heat pipe 320 mm in length and stainless steel-plate fins 2 mm in thickness. Each of ethanol-charged heat pipe contained with a screen wick had an evaporation of 150 mm, a condensation of 150 mm and adiabatic of 20 mm. HPHE was analyzed the counter flow effect of temperature ranges for inlet hot air, 100-120°C, and mass flow rates, 80 LPM, with constant water’s temperature, 30°C, and flow rate ranges, 0.25 to 0.75 LPM. The experiment results were calculated the NTU and Effectiveness in order to create the mathematical model with function of two variables. The Gauss-Seidel method was used for iteration in the MATLAB program. The NTU-Effectiveness model in term of second – degree equation was verified with experimentation using the ratio of hot air heat capacity rates to water heat capacity rates 0.070, 0.035 and 0.020. The effectiveness results of mathematical model are differ from the experimentations by 14.41%. This research is expected to have the mathematic model not only aided prediction the thermal performance but also aided design the HPHE system.
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