HAP Quick Tour

How It Works

HAP's graphical user interface makes entering information and generating reports fast and easy. Your "home base" when using the program is the "main program window". This main program window consists of several components used to work with project data.
HAP40 Main Screen

  • The Menu Bar provides menus of options for performing a variety of program tasks.
  • The Tool Bar provides buttons for performing many of the same tasks provided on the Menu Bar
  • The data tree panel on the left lists all the major categories of input data. These include weather, spaces, systems, plants, schedules, walls, roofs, windows, doors, shades, chillers, cooling towers, boilers, electric rates, and fuel rates.
  • The item panel on the right lists the items you have entered for a particular category of data. The figure above shows a list of spaces entered for a project.

By clicking on items in the right-hand panel and/or using toolbar and menu bar options you can easily manipulate project data. For example, double-clicking on a space item allows you to edit its data. Highlighting a group of five spaces and then using options on the Reports Menu lets you generate reports listing input data for the spaces. With this graphical interface design, data in your project is easy to see and manipulate, and is therefore efficient to work with.

Designing Systems

All system design analyses start with defining the weather conditions for the site. Clicking on the weather icon on the main program window displays the weather properties window shown in the figure. Users choose from a database of design weather data taken from sources such as the ASHRAE Handbook of Fundamentals, or users can enter their own design data. These parameters are used to generate hourly profiles of temperature, humidity and solar radiation for design cooling days and this serves as the basis for design cooling load calculations.



HAP40 Weather
Next, the user divides the building into spaces and defines the load-related characteristics of each space. This includes properties of walls, roofs, windows, doors, floors and internal heat gains. A portion of the Space Properties window appears in the figure, showing input data for internal heat gains.
HAP40 Spaces
While entering space data, users can add schedules, and wall, roof, window, door or external shade constructions to the project library without leaving the Space window. For example, an item on the drop-down list for schedules shown in the figure can be used to create a new schedule and add it to the project library. Or, pressing the "Schedule" button allows the currently selected schedule to be modified.
HAP40 Schedule
When the option to create or modify a schedule is used, the Schedule properties window shown in the figure appears. Schedules can be defined graphically by drawing bars on the schedule graph or can be defined by entering values in the cells that appear above the graph area. As shown, a schedule can consist of up to eight 24-hour profiles which can be assigned both by day of week and time of year. Typically for system design work, only one or two profiles are used since you are only looking at system operation on design cooling days. For energy analysis applications, more profiles can be defined to represent weekday, weekend, and holiday patterns of occupancy, lighting use, and/or equipment use.

After defining all the spaces in the building, the HVAC system is defined. HAP is able to analyze many system types and a wide variety of system controls. The program then tailors sizing calculations to the system type and controls you define. This is referred to as "system based design".


HAP40 Systems
The Air System Properties window allows you to configure, add and remove components from your system, and to define the properties of each component in an efficient manner. The figure shows input data for the ventilation air component of a system.


Once the HVAC systems are defined, system design reports can be generated. When you request reports, the program automatically figures out whether calculations are needed and if so, performs the calculations automatically. System design reports list the required sizes of system components as well as detailed cooling and heating load component information.

HAP can also be used to size chilled water, hot water and steam plants which serve single air systems or groups of air systems.

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