.BuildingSystems.Fluid.HeatExchangers.BaseClasses.PartialEffectivenessNTU

Information

Partial model of a heat exchanger without humidity condensation. This model transfers heat in the amount of

Q = Qmax ε
ε = f(NTU, Z, flowRegime),

where Qmax is the maximum heat that can be transferred, ε is the heat transfer effectiveness, NTU is the Number of Transfer Units, Z is the ratio of minimum to maximum capacity flow rate and flowRegime is the heat exchanger flow regime. such as parallel flow, cross flow or counter flow.

The flow regimes depend on the heat exchanger configuration. All configurations defined in BuildingSystems.Fluid.Types.HeatExchangerConfiguration are supported.

By default, the flow regime, such as counter flow or parallel flow, is kept constant based on the parameter value configuration. If a flow reverses direction, it is not changed, e.g., a heat exchanger does not change from counter flow to parallel flow if one flow changes direction. To dynamically change the flow regime, set the constant use_dynamicFlowRegime to true. However, use_dynamicFlowRegime=true can cause slower simulation due to events.

Models that extend from this partial model need to provide an assignment for UA.

Revisions


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