Heating and cooling loads are the fundamental basis for the design of the mechanical systems within a building. The calculations inform the sizing of diffusers, ductwork, pipework, air handling units, heat pumps, chillers, fans and more.

Before we begin;

  • Make sure you have assigned the appropriate Room Templates to each room on the Rooms page.

  • Make changes to Schedules as required.

  • Assign Rooms to Zones via the Project Data Editor

  • Create and Assign required Air Systems

  • Go to the Settings page and click on Run Model.

  • Go to the Results page. You will see a list of Zones in your project.

Zone-by-Zone Load Results

Room Results Page Guide. Open in new tab to enlarge

The Zone Results are divided into 3 sections - Load Results Zone List, Zone Load Results and Detailed Zone Results. When you select a zone from the Zone List you will see a detailed break-down of each zone under Load Results such as area, occupancy, system , airflow, zone checks and peak load details.

Detailed Load Results (online view)

Under the Detailed Load Results, you can see the breakdown of zone-by-zone Cooling Peak Load and Heating Peak Load. You can see the envelope gains and losses in Btu/h or % for your external loads such as Exterior Walls, Glazing, Roofs, Floors, etc. You will also be able to see the internal gains for the Interiors Walls and Floors and loads. This information will help you minimize unwanted heat gain in summer and heat loss during winter.

Spreadsheet Export Example

You can also download these results as a spreadsheet. Click on the Export Spreadsheet button under Load Results Zones header. The Spreadsheet will have 2 sheets - Zone Results Summary and Zone Results All. The Zone Results Summary sheet will show the sensible, latent and total cooling and heating loads. The Zone Results All sheet will show more detailed information such as safety factor, air-flow rates, infiltration, etc. This is a bulk export of the results and provides are variables known about about each zone.

Zone Check Summary Report

The results can be downloaded to a standard pdf Zone Check Summary Report. This report is helpful for reviews, records or other design tasks such as sizing diffusers and VAV within a space. Simply click the Export PDF Report button to review a preview of the report and download. The report includes the peak heating and cooling loads, heat gain/losses breakdowns, zone airflow rates and checks.

Using the Results

  • The heating and cooling load calculations allows for sizing of diffusers, ductwork, pipework, air handling units, heat pumps, chillers, fans and more.

  • The web interface allows for easy sharing and reviewing of these results so that errors can be spotted and corrected with ease.

  • The envelope gains and losses will help you make better design decisions to minimize unwanted heat gain in summer and heat loss during winter.

  • The spreadsheet export makes connecting the results to other workflows such as BIM or existing Excel Design Files your firm may be using.

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