2.1 Heat Leak into Storage Vessel
Theoretical model equations for application are based on the heat transfer through the storage vessels shell, bottom and roof (top). To calculate/estimate the generated BOG flow rate in storage vessels, effects of radiant, conductive and convective heat inputs to the storage vessel are combined for adequate estimates. Although, some assumptions of proper design and selection of insulation materials to prevent or minimize heat leaks or losses from storage vessels are made, still heat can be transferred to the refrigerated product contained in the vessel, and from the environment due to ambient temperature, solar and wind speed. An approximate BOG generation value can be calculated by dividing the total heat input by the latent heat of the refrigerated product at fluid temperature. A typical BOG rate can be estimated by the model equation (1), by the application of the coefficients for percentage of the refrigerated storage vessel working volume per day [3,4] . Generally stated as,
BOG Rate due to