Cooling Water Library
- Last UpdatedOct 15, 2021
- 3 minute read
The Cooling Water Library (CWLib) is a standard Model Library provided with AVEVA Process Simulation. It includes specialized models for simulating typical cooling water networks and other incompressible fluid networks.
We have designed this Model Library for the transition from sizing the cooling water pipes to performing a flow distribution study to check for even cooling water distribution. It supports reverse flow and can simulate ring main systems, such as a firewater system.
By changing the Fluid in the Supply model, a simulation based on CWLib models can model other types of incompressible flow systems, such as a Hot Oil system.
The following table lists the models that are available in this Model Library. The table includes very brief descriptions for each model. The Model Help in the AVEVA Process Simulation user interface contains more detailed information for these models. See Open the Model Help for a Model Type or Model Library for more information.
|
Name |
Type |
Description |
|---|---|---|
|
Enlarger |
Model |
Represents a pipe enlargement or reduction based on equations in Crane Technical Paper 410. |
|
HX |
Model |
Represents the cooling water side of a typical heat exchanger. You may specify the pressure drop at a given flow rate. |
|
Mix |
Model |
Mixes two streams into one stream. In Process mode, the mixer includes the pressure difference slack. Therefore, each heat exchanger can set its own cooling water flow, and you can independently size the pipes combining at a mixer. |
|
Orifice |
Model |
Represents a flow restriction orifice (RO) used to balance flow through separate parts of the cooling water flow network. The Orifice is based on square-edged orifice equations in Crane Technical Paper 410. |
|
Pdrop |
Model |
Sets a constant pressure drop in all simulation modes. |
|
Pipe |
Model |
Uses the Darcy formula to calculate the relationship between flow and pressure drop for incompressible flow. |
|
Pump |
Model |
Models a dynamic pump (for example, a centrifugal or axial pump). This model uses performance curves to relate pressure rise and brake power to flowrate. It also uses affinity laws (fan laws) or multi-curve interpolation to calculate the effects of speed or impeller diameter on the performance curve. |
|
Return |
Model |
Serves the role of a typical sink model. You must use these models to terminate the simulation so that you can change the mode from Process mode to Fluid Flow mode. The Return model specifies the terminal pressure of the cooling water network. |
|
Split |
Model |
Splits one stream into two streams. |
|
Supply |
Model |
Serves the role of a Source unit. It specifies the pressure and the cooling tower water temperature. In Process mode, do not specify the water flow rate since the individual heat exchanger units will set the total cooling water demand. |
|
Valve |
Model |
Uses an incompressible valve flow equation. You typically use the valve as a variable resistance to reduce flow through a cooling water exchanger to equalize flows. |
|
Valve3W |
Model |
Models a three-way mixing or diverting control valve and includes an optional control port connection. Three-way valves are used in tempering systems, bypass loops, product piping systems, and many other applications. The model consists of two independent flow path submodels and an internal mixer or splitter. Depending on your selected configuration, you can independently size the two flow paths or size them to the same Cv value. |
|
Valve3W_FlowPath* |
Submodel |
Sizes and calculates the pressure drop across each flow path in the Valve3W model. |
* Only Model Writers can view these submodels.