Numerical Investigations of Thermal Comfort inside Cruise Ships

摘要

The design criteria of air conditioning in ships became more refined especially with the development of shipping industry, crew's health and personnel comfort strongly affected by inside thermal environment in air-conditioned spaces, the distribution of air temperature and relative air velocity should consider the presence of occupants and other factors such as food vapors and heat from other sources. This thesis focuses on analyzing indoor thermal comfort inside a hall in a cruise ship through numerical investigation of changing the location and distribution of air supply and air extract grilles on air properties such as temperature and velocity. The present investigation studies thermal comfort in a dining hall at the top floor of a cruise ship, which is basically, used as multifunction hall. Five suggested design alternatives were studied and in each case the location, dimensions and even number of air supply and air extract grills and boundary conditions changed to assess the effect of these parameters on thermal comfort levels for occupants. The effectiveness of thermal comfort on occupants is portrayed through discussing velocity contours, temperature patterns, local relative humidity, PMV and PPD based on Fanger's model at various locations in the cruise ship. The numerical investigation has been performed with the aid of computation fluid dynamics technique (CFD) which is commercially available as (ANSYS 17.2) with number of mesh elements around 5,000,000. The simulation has been carried out using different boundary and operating parameters of solar energy and climatic conditions, the paper ends with a brief summary of conclusions and design recommendations.