Buildings.Fluid.HeatExchangers.CoolingTowers.Data.Merkel
Performance data records for wet cooling towers using Merkel's method
Information
This package contains performance data records for wet cooling towers that use Merkel's method. The data records can be used with the model Buildings.Fluid.HeatExchangers.CoolingTowers.Merkel.
Extends from Modelica.Icons.MaterialPropertiesPackage (Icon for package containing property classes).
Package Content
| Name | Description |
|---|---|
 Generic
|
Performance data record for a wet cooling tower that uses Merkel's model |
 BaseClasses
|
Package with base classes for Merkel cooling tower data records |
Buildings.Fluid.HeatExchangers.CoolingTowers.Data.Merkel.Generic
Performance data record for a wet cooling tower that uses Merkel's model
Information
Performance data record for a wet cooling tower that uses Merkel's method.
Extends from Buildings.Fluid.HeatExchangers.CoolingTowers.Data.BaseClasses.BaseCoolingTower (Performance data record for dry and wet cooling towers).
Contents
| Type | Name | Default | Description |
|---|---|---|---|
| Real | PFan_Q_flow_nominal | -0.05 | Ratio of fan power to provided cooling at full load (negative as Q_flow_nominal<0) [1] |
| Nominal thermal performance | |||
| HeatFlowRate | Q_flow_nominal | Nominal heat flow rate (negative, as heat is removed from the fluid) [W] | |
| Temperature | TCooIn_nominal | 308.15 | Nominal cooling loop inlet temperature [K] |
| Temperature | TCooOut_nominal | 302.59 | Nominal cooling loop outlet temperature [K] |
| Temperature | TAirInWB_nominal | 298.7 | Nominal outdoor (air inlet) wetbulb temperature [K] |
| Nominal condition | |||
| PressureDifference | dp_nominal | Pressure difference at design mass flow rate [Pa] | |
| Advanced | |||
| Real | ratCooAir_nominal | Buildings.Fluid.HeatExchange... | Coolant-to-air mass flow rate ratio at design condition, used to compute air flow rate for UA_value [1] |
| fan | fanRelPow | Fan relative power consumption as a function of control signal, fanRelPow=P(y)/P(y=1) | |
| Real | fraFreCon | 0.125 | Fraction of tower capacity in free convection regime [1] |
| UACorrection | UACor | UA correction factors | |
Modelica definition
record Generic
"Performance data record for a wet cooling tower that uses Merkel's model"
extends Buildings.Fluid.HeatExchangers.CoolingTowers.Data.BaseClasses.BaseCoolingTower(
TCooIn_nominal = 308.15,
TCooOut_nominal = 302.59,
ratCooAir_nominal =
Buildings.Fluid.HeatExchangers.CoolingTowers.BaseClasses.Functions.equivalentHeatCapacity(
TIn=TAirInWB_nominal, TOut=TAirInWB_nominal+5) /
Buildings.Utilities.Psychrometrics.Constants.cpWatLiq);
parameter Modelica.Units.SI.Temperature TAirInWB_nominal=298.7
"Nominal outdoor (air inlet) wetbulb temperature";
parameter BaseClasses.UACorrection UACor "UA correction factors";
end Generic;