Well-mixed compartment types

The transport type of model becomes necessary where site-specific predictive cability is needed. Mathematically this type is distinguished from the well-mixed compartment by its dependence upon partial differential equations generated by... 

With this type of model, the subject is represented as a number of well mixed compartments. When all the rate processes are first-order, equations in the form of sums of exponential terms are commonly used. Thus a two-compartment model is illustrated by Eq. (3) ... 

SOFCs can be viewed as a special type of a chemical reactor which generates electrical power in addition to heat. The first rigorous engineering modeling of SOFC units was carried out in 1983 by Debenedetti and Vayenas, who assumed well-mixed (CSTR-type) anodic and cathodic compartments, and isothermality within the SOFC stiucture for the overall reaction ... 

In its simplest form a partitioning model evaluates the distribution of a chemical between environmental compartments based on the thermodynamics of the system. The chemical will interact with its environment and tend to reach an equilibrium state among compartments. Hamaker(l) first used such an approach in attempting to calculate the percent of a chemical in the soil air in an air, water, solids soil system. The relationships between compartments were chemical equilibrium constants between the water and soil (soil partition coefficient) and between the water and air (Henry s Law constant). This model, as is true with all models of this type, assumes that all compartments are well mixed, at equilibrium, and are homogeneous. At this level the rates of movement between compartments and degradation rates within compartments are not considered. 

SimpleBox is a multimedia mass balance model of the so-called Mackay type. It represents the environment as a series of well-mixed boxes of air, water, sediment, soil, and vegetation (compartments). Calculations start with user-specified emission fluxes into the compartments. Intermedia mass transfer fluxes and degradation fluxes are calculated by the model on the basis of user-specified mass transfer coefficients and degradation rate constants. The model performs a simultaneous mass balance calculation for all the compartments, and produces steady-state concentrations in... 

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