The thermal conductivity and the particle-to-fluid heat-transfer coefficient for peanut-shaped polyester particles in a packed bed were determined simultaneously using the pseudo-random binary noise sequence (PRBNS) response technique. The modified Dispersion-Concentric (D-C) model was applied to beds packed with the non-spherical particles. A time domain method, using the convolution integral, was developed for removing the effects of the bed ends and the transducer time lag on the experimental responses. Parameter estimation was performed in the time domain, using a simplex method to fit the thermal response calculated from the parametric D-C model to the experimental response curve. The particle-to-fluid heat transfer coefficient in the bed was determined to be 106 W/m(2).K at an interstitial fluid velocity of 2.0 m/s. The thermal conductivity of polyester was 0.22 W/m.K at 313 K.