1. The company has requested that you run experiments to improve the performance of a heat pump (to achieve higher coeff

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1 The Company Has Requested That You Run Experiments To Improve The Performance Of A Heat Pump To Achieve Higher Coeff 1 (116.54 KiB) Viewed 13 times

1. The company has requested that you run experiments to improve the performance of a heat pump (to achieve higher coefficient of performance, COP). The factors that affect heat pump performance are temperature of the evaporator, pressure of the condenser, efficiency of the compressor, and type of refrigerant used. ) (a) Determine the Taguchi experimental design orthogonal array (show Ls is the appropriate choice). The operating conditions for each parameter and level are listed in Table Q1a below. [3 marks] (b) Measured COP values for Ls Taguchi orthogonal array are shown in Table Q1b. Determine the impact of heat pump operational parameters on heat pump performance using SN (signal- to-noise) methodology. What is the dominant factor? [20 marks] (c) Perform mean effect analysis and find the best combination of operational parameters. (10 marks] Level 3 Low Level 1 Level 2 Evaporator pressure High Medium Condenser temperature High Medium Compressor efficiency 90% 80% Refrigerant type R245fa R134a Table Q1a. Heat pump operating factors and conditions. Low 70% R1234yf A B C D COP 1 COP 2 COP 3 1 1 1 3 1 4 WN 3 1 2.5 3 اني | ني | | | 4 5 2 2 6 2 3 1 2 7 3 1 3.75 2.5 Exp. 1 1 2.5 3 2 2 2 3 4 3 3 2.75 1 2 3 3 3.25 2.5 2 3 1 2.75 3.5 3 3 3.25 3 3.25 3.5 3.75 3 2.5 Table Q1b. Taguchi L9 orthogonal array. COP for each experiment has been evaluated three times. Note: if you are using blank columns in Table Q1b for further calculations you MUST submit this page with your exam book. Please write you student number in the top right corner. Note 2: solving this problem does not require any knowledge of thermodynamics. 2 3 8 3 1 2 3 3 4 2 3 9 1 2