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    EFFECTS OF CONTROL FACTORS ON OPERATING TEMPERATURES OF A MECHANICAL HEAT PUMP IN WASTE HEAT RECOVERY: Evaluation Using the Taguchi Method
    (Vinca Inst Nuclear Sci, 2018) Motorcu, Ali Rıza; Coskun, Salih; Karabulut, Sener
    In the present study, the operating temperatures of the mechanical heat pump 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 mechanical heat pump. 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 and the operating temperatures were predicted with a mean squared error less than 12%.
  • [ X ]
    Öğe
    Evaluation of control parameters' effects on system performance with Taguchi method in waste heat recovery application using mechanical heat pump
    (Elsevier Sci Ltd, 2012) Coskun, Salih; Motorcu, Ali Rıza; Yamankaradeniz, Nurettin; Pulat, Erhan
    This paper deals with an investigation of the effect and optimization of control parameters on the system performance in waste heat recovery application using mechanical heat pump (MHP). The experimental studies have been conducted under varying compressor speed, wastewater temperature and flow rate. The experiments have been planned based on Taguchi's L27 orthogonal array with each trial performed under different conditions of compressor's speed, wastewater temperature and flow rate. The optimum parameter combination has been obtained by using the analysis of signal-to-noise (S/N) ratio. The level of importance of the control parameters on the system performance has been determined by using analysis of variance (ANOVA). Main effects plots and interaction effects plots have been utilized to optimize and analyze the relation between the control parameters and the system performance. The results obtained from Taguchi method were also compared with ANN results. The experimental study indicated that it is possible to increase system performance significantly in the waste heat recovery application using MHP. (C) 2011 Elsevier Ltd and IIR. All rights reserved.