EnviroSim Releases PetWin 5.2

The EnviroSim team is pleased to announce the release of PetWin 5.2.

PetWin 5.2 contains many exciting new updates that build upon the energy and operating cost features first introduced in BioWin 5.0, further expanding its capability as a plant management tool, and for comparing design alternatives.A more comprehensive description of the upgrade may be found in a What's New in PetWin 5.2 in PDF format.

PetWin 5.2 highlights include:


Power - Expanded tracking in flowsheet elements

The ability to track / calculate power use in all flowsheet elements has been expanded. All elements can track power demand on either a unit volume/flow basis, or a direct user-input kW (or hp) basis. Each of these options can be constant, or vary with time. Additionally, sludge output elements now have the ability to track power demand on either a unit flow basis, or a direct user-input kW (or hp) basis.


Power - New & Improved Output Functionality

Two new outputs related to power requirements have been added to PetWin 5.2:

  1. You can add pre-defined air supply group (i.e. blower) tables to the album. These tables show the breakdown of power requirements for different air supply groups that have been defined, along with various calculated values used in the blower power calculations (e.g. intake pressure, discharge pressure, intake airflow).
  2. You can add a chart that shows the peak 15-minute power demand for each month over the most recent 12 months of simulation; this facilitates calculating and checking demand charges for the subsequent month.

Furthermore, PetWin 5.2 pre-defined power tables and charts have been rationalized and expanded to improve clarity. When creating power tables and charts, you now have the option to include “system wide” parameters such as HVAC as separate line items.

Heating Requirements - New & Improved Output Functionality

The heating power requirement is determined for Anaerobic Digester and Thermal Hydrolysis flowsheet elements. Typically, the main component of the heating power is the amount of energy required to heat an influent stream to the desired operating temperature specified in the Anaerobic Digester and/or Thermal Hydrolysis unit elements. Additional heating power may be required in an Anaerobic Digester element to overcome a specified digester heat loss. A new feature for PetWin 5.2 is that the anaerobic digester heat loss can vary with time. The heating power requirement is provided from a fuel or electrical source [see later], but there are also options in PetWin for heating power recovery within the Anaerobic Digester and Thermal Hydrolysis Unit elements. The heat recovery option for anaerobic digesters is a new PetWin 5.2 feature.

When the option to include a heat exchanger is specified, PetWin assumes that the hot digester (or THU) output stream is used to heat the cool incoming stream in a counter-current heat exchanger. Users can enter the efficiency of the exchanger as well as the temperature difference between the heat exchanger’s hot exit stream and cold entry stream. A schematic representing the difference in temperature between the hot exit and cold entry streams for the heat exchanger is shown below:



Choose between heating methods

Another new PetWin 5.2 feature is that it is now possible to choose between two heating methods for anaerobic digesters and thermal hydrolysis units:

  1. Electrical heating which will incur an electricity cost, or
  2. Heating via an external fuel source used in a boiler (e.g. natural gas, heating oil, diesel, or a custom fuel) which will incur a cost for fuel


Choose how biogas is used

PetWin 5.2 also allows you to choose how biogas generated in an anaerobic digester is used. The overall multiple options for biogas use are shown in the following diagram (and options for additional heating needs are identified):


Digester biogas may be used in three main ways:

  1. Using the biogas in a Combined Heat & Power (CHP) engine. This pathway includes options for selling all or left-over generated power; using or selling non-waste heat, and the method used for additional digester heating if required (i.e. electrical or use of external fuel).
  2. Burning the biogas in a boiler for heating and supplementing via electrical or external fuel sources if insufficient gas is available. If there is any excess biogas after satisfying heating demands, there is an option to sell it.
  3. Either flaring off or selling all of the gas. For either option, the method used for digester heating (i.e. electrical or use of external fuel) must be specified.

Costing Calculations - Fuel consumption, option to sell biogas, and sludge disposal

PetWin 5.2 tracks operating costs in four categories: energy consumption, chemical consumption, sludge disposal, and boiler fuel consumption. Users can specify costs, energy content, and liquid density for a variety of heating fuels via the Project > Costs/Energy > Fuel/Chemical menu.

You can sell CHP-generated power back to the grid, as well as CHP-generated heat. You can also sell  anaerobic digester biogas instead of using it to assist with digester heating. As with CHP power and heat sales, sale of digester-generated biogas will show up as a cost credit (negative cost) in cost charts and tables.



Track sludge disposal costs on a unit volume basis

Finally, PetWin 5.2 adds the ability to track sludge disposal costs on a unit volume basis in addition to unit mass basis.


General usability improvements

In addition to the new features above, a number of usability improvements have been made, including:

  1. Pop-up hints have been added to clarify pipe minor loss calculations in pump flowsheet elements.
  2. The ability to plot aeration parameters alpha and beta has been added to the general time and current value series dialogue boxes.
  3. If a CHP engine is associated with an anaerobic digester element, red text is shown in the fly-by pane as a visual indicator.
  4. Improved handling of how PetWin Album tables and charts are added to the PetWin Notes editor via the right-click “Add to notes” command. For example, tables are automatically formatted before being pasted to the Notes editor and tables with many columns are automatically divided into smaller tables that will fit the Notes editor.


Download PetWin 5.2

You can download the full installation for PetWin 5.2 using the link below.

NOTE : PetWin Updater will not automatically upgrade PetWin 4.1 or earlier versions to PetWin 5.2. You MUST run the full installation from the link provided. Thereafter the PetWin Updater will always be checking that your files are up to date :

Download PetWin 5.2

Other important items to note:

  1. The upgrade to 5.2 will not affect older PetWin versions (PetWin 4.1 and earlier) which are separate applications. This means that users can keep their older copies of PetWin.
  2. We are emailing the registered contact for specific PetWin serial number(s). If an organization has multiple copies or users of PetWin, we would be pleased if the registered contact can advise other users of this new version and these upgrade instructions.


Annual License Customers

Annual license customers can now upgrade to PetWin 5.2; releases and upgrades are included in the annual lease and distributed electronically. Instructions on how to electronically upgrade to PetWin 5.2 can be found here.

Perpetual License Customers

Perpetual license customers who purchased after April 1, 2016 will be emailed instructions on how to electronically upgrade to PetWin 5.2 free of charge. If you have not received your upgrade email, please contact us. Customers who purchased PetWin prior to April 1, 2016 may order an upgrade here.

Academic Licenses

Academic licenses can now be upgraded to PetWin 5.2; releases and upgrades are included in the annually renewed license and distributed electronically. Instructions on how to electronically upgrade to PetWin 5.2 can be found here.

Enjoy your new PetWin 5.2. We look forward to your feedback.