The effects of possible parameters affecting system performance air cycle refrigeration systems are examined through analysis of the thermodynamic properties. The study was carried out on varying number of air cycle refrigeration system used in air conditioning the cabin of an aircraft. Analysis was carried out for each of the system types to determine some parameters as cabin temperature (Tcb), Refrigerating effect (RE), compressor work (Wc) and coefficient of performance (COP) from the

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... ed parameters. Results show that Bootstrap Air Cycle Refrigeration System has the best COP of 0.78 followed by the system working on reversed joule cycle (Bell-Coleman cycle) with COP of 0.68, while the Reduced Ambient Air Cycle Refrigeration System produced the best refrigerating air temperature of 245.56K (-27.44 0 C) at entropy of 1.029127kJ/kgK that necessitated the cooling of the cabin from a temperature of 323K (50 0 C) to 294K (21 0 C). This is required comfort temperature for the cabin occupants. These have a whole lot of similarity with functioning data designed originally for the ACRSs meant for trains. Response surface methodology was done using Design Expert V11 (Trial Version) for optimization. The thermodynamic properties so determined in this study will be useful in designing Nigerian made aircraft and also serves as an important addition to the information storage bank of research institutes in the country.