• GSC—Goal Seek and Control to automate the determination of input parameters that will yield desired output values and simulate control functions within systems
• CST—CoST calculations of pipes and components

Each of the AFT Arrow modules can work individually or together within AFT Arrow. And since they are add-on modules to AFT Arrow, they can work with all of your existing system models.

Goal Seek & Control - GSC Module

One of the powerful benefits of system modeling is the what-if potential, the ability to quickly evaluate the effects of changing system parameters. The AFT Arrow GSC module automates this process so that ti requires much less time than traditional, manual iterative analyses. To determine what valve open percent will achieve a target flow is as easy as identifying the valve loss factor as a variable and specifying the value of the desired flowrate.

That's only the beginning, as the GSC module's sophisticated goal seeking engine allows you to define multiple variables and goals at multiple locations throughout the system. Goals can be single point, differentials or sums. The GSC module answers questions such as: what pump speed will achieve a specified total flow to multiple, remote tanks or what positioning of multiple valves will yield a desired differential supply pressure between pieces of equipment in your system.

The possibilities are almost endless and raise the productivity of your system modeling to new levels.

Modeling parameters that may be used as variables or goals include -

• Compressors/Fans - speed, flow, head rise
• Valves - open percent, Cv/K, deltaP, flow
• Tanks - pressure, temperature
• Control valves - setpoint, open percent
• Orifice - diameter, area
• Heat exchangers - heat rate, temperatures, area, U value
• Spray discharge - area, K value, exit pressure

Most of the cost of a typical piping or ducting system is fixed in the initial stages of design where system sizing is determined. Traditional methods impose too much distance between this design stage and cost determination, obscuring the impact of design decisions on system costs. By calculating system costs, the CST module lets you tightly integrate your design and cost estimating process, eliminating the barriers to development of cost effective designs. In conjunction with AFT Arrow's energy cost calculation capabilities, the impact of design decisions on both fixed and life cycle costs are clearly shown. The CST module provides a flexible means of defining system component and piping costs in databases that may be accessed by your AFT Arrow model. In addition to the traditional hydraulic information, output now also contains the total cost and a cost breakdown by component. The CST cost module databases provide the freedom to arrange your cost data as you want, whether it be by component type, equipment category, project or almost any arrangement that fits your needs. Database Manager lets you easily move data between databases, create new databases and manage the data used in your system model. In addition to your own data, the CST module integrates with an optional MeansDataTM module, allowing ready access to the extensive cost information available in this industry standard.

If you're serious about developing cost effective designs, you need the tight integration between your design and its cost provided by AFT Arrow CST.