modelNTU_L2_advanced
NTU-based heat transfer resistance
Extends from ClaRa.Basics.Icons.NTU, ClaRa.Basics.Icons.ComplexityLevel (Displays the complexity level inside model icon ), Icons.Obsolete_v1_1 (This model will be not longer supported than Version 1.3!).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| SI.Area | A_heat_m | (A_heat_o - A_heat_i)/log(A_heat_o/A_heat_i) | Mean area of heat transfer (single tube) |
| SI.Area | A_heat_i | 2*Modelica.Constants.pi*radius_i*length*N_t*N_p | Area of heat transfer at inner phase |
| SI.Area | A_heat_o | 2*Modelica.Constants.pi*radius_o*length*N_t*N_p | Area of heat transfer at oter phase |
| Boolean | showExpertSummary | false | |Summary and Visualisation||True, if expert summary should be applied |
| Geometry | |||
| Integer | N_t | 1 | Number of tubes in one pass |
| Integer | N_p | 1 | Number of passes |
| SI.Length | length | Tube length (for one pass) | |
| SI.Length | radius_i | Inner radius of tube | |
| SI.Length | radius_o | Outer radius of tube | |
| SI.Mass | mass_struc | 0 | Mass of inner structure elements, additional to the tubes itself |
| Real | CF_geo | 1 | Correction coefficient due to fins etc. |
| Initialisation | |||
| SI.Temperature | T_w_i_start | 293.15 | Initial temperature at inner phase |
| SI.Temperature | T_w_a_start | 293.15 | Initial temperature at outer phase |
| ClaRa.Basics.Choices.Init | initChoice | ClaRa.Basics.Choices.Init.noInit | Initialisation option |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| ClaRa.Basics.Interfaces.HeatPort_a | outerPhase | outer side of cylinder | |
| ClaRa.Basics.Interfaces.HeatPort_a | innerPhase | inner side of cylinder |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| ClaRa.SimCenter | simCenter | ||
| String | complexity (from ComplexityLevel) | "??" | |
| SI.Mass | mass | Total mass of HEX | |
| SI.Temperature | T_i_in | Inlet temperature of inner flow | |
| SI.Temperature | T_a_in | Inlet temperature of outer flow | |
| SI.MassFlowRate | m_flow_i | Mass flow rate of inner side | |
| SI.MassFlowRate | m_flow_a | Mass flow rate of outer side | |
| SI.CoefficientOfHeatTransfer | alpha_i | Coefficient of heatTransfer for inner side | |
| SI.CoefficientOfHeatTransfer | alpha_o | Coefficient of heatTransfer for outer side | |
| SI.HeatCapacityMassSpecific | cp_mean_i | Mean cp of inner flow | |
| SI.HeatCapacityMassSpecific | cp_mean_a | Mean cp of outer flow | |
| SI.Temperature | T_i_out | Outlet temperature of steady state inner flow | |
| SI.Temperature | T_a_out | Outlet temperature of steady state outer flow | |
| SI.HeatFlowRate | Q_flow_NTU_1 | Steady state heat flow rate outer to inner phase | |
| Real | kA | The product U*S | |
| Real | effectiveness | Heat exchanger efficiency | |
| TILMedia.Solid.Solid | solid | ||
| HeatExchangerType | heatExchangerType | ||
| Summary | summary |
Contents
| Name | Description |
|---|---|
 Material | |
 HeatExchangerType | |
 Summary |