الفهرس 
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Abstract
The ship structure can be considered a closed volume, which includes personnel, machines, and all other necessary units. The occupants’ spaces are relatively small volumes, with low internal height. This leads to small air volumes within the spaces and a difficulty to keep good air velocity and temperature distribution throughout. The purpose of this study is to investigate the effect of main design parameters, namely: supply air velocity, supply diffuser location, and return air location, on thermal air diffusion in ship’s crew cabin space.
To evaluate air flow pattern in such cabins, a computer model was constructed to simulate the air velocity and temperature distribution throughout the selected space. The airflow simulation program ”Fluent” was used, which is essentially based on Computational Fluid Dynamics (CFD). Field measurements were also taken inside a typical cabin onboard a merchant vessel in order to validate the model. The Air Diffusion Performance Index (ADPI) was taken to be the main design criterion in the current study, as it has been used successfully as a design tool to predict thermal comfort in similar application. Preliminary results showed that the cabin design considered was unable to provide the required ADPI value. Hence, a number of design modifications were proposed and corresponding ADPI values evaluated. Results showed that thermal comfort can be reached through an optimal combination of main design parameters.