Modelica.Fluid.Dissipation.HeatTransfer.HeatExchanger

Information

Heat exchanger

Flat tube heat exchanger

Calculation of the mean convective heat transfer coefficient kc for the air-side heat transfer of heat exchangers with flat tubes and several fin geometries. See more information .

Round tube heat exchanger

Calculation of the mean convective heat transfer coefficient kc for the air-side heat transfer of heat exchangers with round tubes and several fin geometries. See more information .

Package Content

Name	Description
kc_flatTube
kc_flatTube_KC
kc_flatTube_IN_con	Input record for function kc_flatTube and kc_flatTube_KC
kc_flatTube_IN_var	Input record for function kc_flatTube and kc_flatTube_KC
kc_roundTube
kc_roundTube_KC
kc_roundTube_IN_con	Input record for function kc_roundTube and kc_roundTube_KC
kc_roundTube_IN_var	Input record for function kc_roundTube and kc_roundTube_KC

Modelica.Fluid.Dissipation.HeatTransfer.HeatExchanger.kc_flatTube

Information

Calculation of the mean convective heat transfer coefficient kc for the air-side heat transfer of heat exchangers with flat tubes and several fin geometries. Note that additionally a failure status is observed in this function to check if the intended boundary conditions are fulfilled. See more information .

Inputs

Name	Description
Constant inputs
IN_con	Input record for function kc_flatTube
Variable inputs
IN_var	Input record for function kc_flatTube

Outputs

Name	Description
Output
kc	Convective heat transfer coefficient [W/(m2.K)]
Pr	Prandtl number [1]
Re	Reynolds number [1]
Nu	Nusselt number [1]
failureStatus	0== boundary conditions fulfilled | 1== failure >> check if still meaningful results

Modelica.Fluid.Dissipation.HeatTransfer.HeatExchanger.kc_flatTube_KC

Information

Calculation of the mean convective heat transfer coefficient kc for the air-side heat transfer of heat exchangers with flat tubes and several fin geometries. See more information .

Inputs

Name	Description
Constant inputs
IN_con	Input record for function kc_flatTube_KC
Variable inputs
IN_var	Input record for function kc_flatTube_KC

Outputs

Name	Description
kc	Output for function kc_flatTubePlateFin_KC [W/(m2.K)]

Modelica.Fluid.Dissipation.HeatTransfer.HeatExchanger.kc_flatTube_IN_con

Information

Parameters

Name	Description
HeatExchanger
geometry	Choice of fin geometry
A_fr	Frontal area [m2]
D_h	Hydraulic diameter [m]
D_m	Major tube diameter for flat tube [m]
F_l	Fin length [m]
F_p	Fin pitch, fin spacing + fin thickness [m]
L_l	Louver length [m]
L_p	Louver pitch [m]
T_d	Tube depth [m]
T_p	Tube pitch [m]
alpha	Lateral fin spacing (s) / free flow height (h)
gamma	Fin thickness (t) / lateral fin spacing (s)
delta	Fin thickness (t) / Fin length (l)
delta_f	Fin thickness [m]
Phi	Louver angle [rad]

Modelica.Fluid.Dissipation.HeatTransfer.HeatExchanger.kc_flatTube_IN_var

Information

Parameters

Name	Description
Fluid properties
cp	Specific heat capacity of fluid at constant pressure [J/(kg.K)]
eta	Dynamic viscosity of fluid [Pa.s]
lambda	Thermal conductivity of fluid [W/(m.K)]
rho	Density of fluid [kg/m3]
Input
m_flow	[kg/s]

Modelica.Fluid.Dissipation.HeatTransfer.HeatExchanger.kc_roundTube

Information

Calculation of the mean convective heat transfer coefficient kc for the air-side heat transfer of heat exchangers with round tubes and several fin geometries. Note that additionally a failure status is observed in this function to check if the intended boundary conditions are fulfilled. See more information .

Inputs

Name	Description
Constant inputs
IN_con	Input record for function kc_roundTube
Variable inputs
IN_var	Input record for function kc_roundTube

Outputs

Name	Description
Output
kc	Convective heat transfer coefficient [W/(m2.K)]
Pr	Prandtl number [1]
Re	Reynolds number [1]
Nu	Nusselt number [1]
failureStatus	0== boundary conditions fulfilled | 1== failure >> check if still meaningful results

Modelica.Fluid.Dissipation.HeatTransfer.HeatExchanger.kc_roundTube_KC

Information

Calculation of the mean convective heat transfer coefficient kc for the air-side heat transfer of heat exchangers with round tubes and several fin geometries.See more information .

Inputs

Name	Description
Constant inputs
IN_con	Input record for function kc_roundTube_KC
Variable inputs
IN_var	Input record for function kc_roundTube_KC

Outputs

Name	Description
kc	Output for function kc_roundTube_KC [W/(m2.K)]

Modelica.Fluid.Dissipation.HeatTransfer.HeatExchanger.kc_roundTube_IN_con

Information

Parameters

Name	Description
HeatExchanger
geometry	Choice of fin geometry
A_fr	Frontal area [m2]
D_c	Fin collar diameter [m]
F_p	Fin pitch, fin spacing + fin thickness [m]
L	Heat exchanger length [m]
L_h	Louver height [m]
L_p	Louver pitch [m]
N	Number of tube rows
P_d	Pattern depth of wavy fin, wave height [m]
P_l	Longitudinal tube pitch [m]
P_t	Transverse tube pitch [m]
S_h	Slit height [m]
S_p	Slit pitch [m]
X_f	Half wave length of wavy fin [m]
delta_f	Fin thickness [m]

Modelica.Fluid.Dissipation.HeatTransfer.HeatExchanger.kc_roundTube_IN_var

Information

Parameters

Name	Description
Fluid properties
cp	Specific heat capacity of fluid at constant pressure [J/(kg.K)]
eta	Dynamic viscosity of fluid [Pa.s]
lambda	Thermal conductivity of fluid [W/(m.K)]
rho	Density of fluid [kg/m3]
Input
m_flow	[kg/s]