Room Load and Sizing Results

loadmodeling.tool for Rooms results, sizing, and reports

Patrick Chopson avatar
Written by Patrick Chopson
Updated over a week ago

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.

Requirements for Room Results

Room results are calculated for each room within a Zone. This is done by a parallel EnergyPlus simulation to generate the detailed load breakdowns per room. This parallel simulation can be turned off if not required on the Settings Page. Results are available after the model is run via the Room Results Panel.

The simulation results for rooms are calculated with identical settings to the primary simulation, leading to matching results for rooms and zones if the zoning is one-to-one. Difference may occur if some Rooms are grouped into Zones as the internal conduction heat transfer through walls, floors and ceilings may be impacted by the more detailed zoning in the primary simulation. These impacts will be small and typically will not impact sizing of equipment.

Room-by-Room Load Results

Room Results Page Guide. Open in new tab to enlarge

The Room Results are divided into 3 sections - Load Results Room List, Room Load Results and Detailed Room Results. When you select a room from the Room List you will see a detailed break-down of each room under Load Results such as area, occupancy, system, airflow, room 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. Values shown in the graph are breakdowns of the Sensible Loads. Latent load is included in the table. 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 Room header. The Spreadsheet will have 2 sheets - Room Results Summary and Room Results All. The Room Results Summary sheet will show the sensible, latent and total cooling and heating loads. The Room Results All sheet will show more detailed information such as safety factor, air-flow rates, infiltration, etc. The latent loads are broken down in the spreadsheet are additional results. This is a bulk export of the results and provides are variables known about about each room.

Room Check Summary Report

The results can be downloaded to a standard pdf Room Check Summary Report. This report is helpful for reviews, records or other design tasks such as sizing diffusers other equipment in each room. 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.

Result Variable Definitions

Full descriptions of each result variable is available here.

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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