Advanced hydro-thermal simulation software is decisive for optimizing the design and operation of district cooling and heating system. A model of the system allows layout selection, sizing of infrastructure and equipment, impact of future customer connections, integration of thermal energy storage systems and plants, assess energy performance and carry out trouble shooting analyses.

Wanda is a powerful and user- friendly program for the hydraulic design and optimization of pipeline systems. It consists of various integrated modules: LIQUID, HEAT and CONTROL. In the last three decades, Wanda has been developed and applied successfully for drinking and wastewater transmission and

distribution system plant piping of the process and chemical industry water treatment facilities district heating and cooling systems oil and LNG off-loading systems power plant cooling water systems commissioning of critical PLC hardware operator training systems real-time performance monitoring

Themodule Wanda 4HEAT includes fluid temperatures so that a wide range of heat transferphenomena can be modelled in Wanda. The software can be linked to other packages (such as building demand, lake cooling and geothermal storage models) which allows the simulation of details as well as integrated solutions in a comprehensive way. This makes it an interesting module for district cooling and heating networks and process industry.

Wanda 4 HEAT includes: Temperaturedependentfluidproperties Heattransportduetoflow Heat exchange with the surroundings Heat transfer by dedicated components (heat exchangers) Heat generation by friction

The combination of the HEAT module with CONTROL enables the simulation of the heating/cooling system including the complete control of the system for optimizeddesign:systemperformanceandenergyefficiency short-term scenarios: start-up, shut-down and load changes long-term scenarios: daily and seasonal variations what-if scenarios: economic and technical evaluations

This brochure summarizes includes a number of application examples. Similar hydro-thermal models can be set up, run and analysed also for other application areas.

Wanda 4 HEAT

Simulation software for cooling and heating systems

District heating system design and controlFor the design of a district heating system, the complete range of possible operating conditions should be verified based onthe time varying demands for the hot water and space heating. This requires extended period simulations. The goal of these simulationsistodeterminetherequiredspecificationsofcontrolvalves next to suitable control parameters. The figure aboveshows an example of a very simple heating transfer system with one heat supplier and one heat demand point.

Wanda 4 HEAT can also be used to design anti surge protection for a district heating system. Based on scenarios like full pump trip or emergency shut down of control valves, air vessels or closure patterns can be designed. Since the temperature distribution in the system is taken into account, temperature dependent fluidproperties are also used. This is of importance for cavitation for example.

Offshore oil transmission linesOil from an offshore well is relatively warm. The oil cools down along the subsea transmission line causing an increase of the viscosity and a (significant) reduction of the transport capacityand the production, if no appropriate measures are taken. Wanda 4 HEAT can be used to design re-heating stations or to determine the required capacity of a pipeline tracing system. Since all transport related properties are temperature dependent, the entire design and operation can be optimized with Wanda 4 HEAT, including basic design, surge analysis, control design,

Wanda 4 HEAT userinterface

Installation of temperature measurement by the Dutch water company Waternet

commissioningtestsandoperationalmodifications.Wandaisanindispensabletoolforflowassuranceinoilandgasapplications.

Cooling of drinking waterDue to global warming, the drinking water temperature might rise above acceptable limits. Active cooling of the drinking water maybe a feasible solution. Especially when the extracted heat can be reused in a nearby Aquifer Thermal Energy Storage system. To investigate if active cooling would lead to a decreased temperature in the entire network, simulations with Wanda 4 HEAT have been performed. Based on measurements performed by Waternet a validated hydraulic model has been created. This model has been used to simulate the effect of the active cooling. It was found that active cooling in this relative small distribution network results in decreased temperature in the entire network.During this project it was shown that Wanda 4 HEAT can also be applied in calculations for the temperature distribution in a drinking water network over a longer period of time.

Comparison between simulation with and without active cooling

Comparison between measurements

and simulations

Overview of the Wanda model

Other Wanda Domains

Wanda LIQUIDWanda LIQUID provides a wide variety of components from whichmosthydraulicsystemscanbebuiltforeachtypeoffluid,no matter what size or operational conditions of the network. Wanda LIQUID includes amongst others: Accurate head loss of T-, Y- and X-junctions (Idelchik) Newtonianandnon-Newtonianfluids(usingtheoptionalslurry

friction model) Active components: pumps, (control) valves and air vessels Filling of pipelines Free surface pipe/channel component Transition of partial filled pipelines into a completely filled,

waterhammer sensitive system Advanced components: e.g. reaction-type turbine and dynamic

check valve

Wanda CONTROLWanda CONTROL is a very powerful module supporting all other modules with the simulation of the complex operation of systems. The control module allows the hydraulic system to be linked to a control system. This allows the user to evaluate the effectiveness of different control philosophies on the hydraulic system. Notable features include: Advanced pumping station controllers including parameters for

ramp-up time, minimum speed etc. Activation of valves, pumps, etc Varying of boundary conditions (pressure head or discharge) Sensor and generators (logical or numerical output) Conditional block (IF-statements and switches) Logic operators (AND, OR, exclusive OR, NOT) Numeric operators (add, multiply, functions, etc.) Continuous controllers (PID-controllers incl. start/stop)

Under development: Wanda GASWith Wanda GAS the transient phenomena of gas in pipeline systems can be simulated. The basis is formed by the conservation laws (mass, momentum and energy) and the equation of state of the gas, allowing to calculate the pressures, temperatures, velocities and densities as the primary variables. Typical examples are: Gas transport pipelines Gas well studies Pneumatic systems Air conditioning systems Non-isothermal processes (convection, conduction, expansion) Abrupt phenomena such as choke valve break out or blow out

Integration and extrasExternal software such as MATLAB or LabVIEW can be coupled to Wanda by use of the Open Modelling Interface. OpenMI is a standard especially designed for coupling of numerical models by organizations leading in water management. Interaction with operator training software, real-time control or with mechanical systems is possible.

Users wishes are a major reason to develop new components and options (custom components). Deltares continuously develops more components on request.

Getting started with WandaThere are various Wanda licenses possible for a single module or a combination of modules, modes and components. Stand-alone or server licenses are possible.

If you are interested to explore the capabilities of Wanda, please contact us for a free demo version.

More information: wanda.info@deltares.nl

PO Box 1772600 MH Delft, The NetherlandsT +31 (0)88 335 82 73info@deltares.nlwww.deltares.nl

Deltares is an independent institute for applied research in the field of water, subsurface and infrastructure. Throughout the world, we work on smart solutions, innovations and applications for people, environment and society. Deltares is based in Delft and Utrecht.