THERMAL SCIENCE

International Scientific Journal

Ali Riza Motorcu

,

Salih Coşkun

,

Şener Karabulut

THE EFFECTS OF CONTROL FACTORS ON OPERATING TEMPERATURES OF A MECHANICAL HEAT PUMP IN WASTE HEAT RECOVERY: EVALUATION USING THE TAGUCHI METHOD

ABSTRACT
In the present study, the operating temperatures of the mechanical heat pump (MHP) in waste heat recovery were investigated to elucidate the effect of control parameters such as compressor speed, wastewater temperature and mass flow rate. The experimental trials were performed using the Taguchi L27 full factorial orthogonal array, and the results were optimized for compressor suction gas temperature, compressor discharge gas temperature, temperature difference of water entering and leaving the evaporator, temperature difference of water entering and leaving the condenser, evaporation temperature and condensation temperature. Analysis of variance was conducted to determine the effect of the control factors on the operating temperatures of MHP. The analysis results show that the wastewater temperature was the most significant factor on compressor suction gas temperature and discharge gas temperature. The compressor speed has shown a meaningful effect on the temperature difference of water entering and leaving from condenser. The nominal levels of control factors and the optimal temperatures were specified for the studied experimental parameters. Prediction models were developed for the operating temperatures through the Taguchi method (TM) and the operating temperatures were predicted with a mean squared error less than 12%.
KEYWORDS
mechanical heat pump, heat recovery, waste heat, operating temperatures, Taguchi method
PAPER SUBMITTED: 2015-03-23
PAPER REVISED: 2016-03-08
PAPER ACCEPTED: 2016-03-09
PUBLISHED ONLINE: 2016-04-09
DOI REFERENCE: https://doi.org/10.2298/TSCI150323060M
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2018, VOLUME 22, ISSUE Issue 1, PAGES [205 - 222]
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The effects of control factors on operating temperatures of a mechanical heat pump in waste heat recovery: Evaluation using the Taguchi method

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