In this paper, the effect of various adsorbents with different geometry on the coefficient of performance (COP) and specific cooling power (SCP) of solar adsorption chiller with four quadric parabolic concentrators and also with activated carbon/methanol as working pair has been examined experimentally. The experiments were carried out by several adsorbents involving of simple adsorbent (SAD), annulus adsorbent (AAD), modified annulus adsorbent (MAAD), and combination of modified annulus and simple adsorbent (CMASD). Each adsorbent bed filled by 200 g activated carbon. Results compared at two inlet chilled water temperatures of 30 degrees C and 25 degrees C, three mass flow rates passing from evaporator of 0.1, 0.15 and 0.18 kg s(-1) that associated with the Reynolds number of 600, 1000 and 1200, respectively. The highest COP and SCP of 0.527 and 170.1 W kg(-1) was obtained for combination of modified annulus and simple adsorbent (CMASD) with T-in = 30 degrees C and Re = 1200 ((m) over dot = 0.18 kgs(-1)), respectively. The maximum values of COP of 0.4835, 0.4395 and 0.4307 and also maximum values of SCP of 124.5, 113.24 and 111.3 W kg(-1) were obtained for modified annulus adsorbent (MAAD), annulus adsorbent (AAD), simple adsorbent (SAD) with T-in = 30 degrees C and Re = 1200 ((m) over dot = 0.18 kgs(-1)), respectively. (C) 2020 Elsevier Ltd. All rights reserved.