The energy performance of a ventilation system is influenced by a number of factors. For example, these may include design elements such as the air flow rate, the amount of fresh air introduced in the system, the presence of a reheat coil and a heat recovery device, the type of fan and ventilation control, and the leakiness of the intake air damper. The design of ventilation systems depends on the type of application. For example, it may include applications such as controlling the injection of fresh air, controlling air redistribution, room diffusion and stratification, maintaining comfort standards, maintaining air quality within acceptable limits of carbon dioxide, oxygen and odour content, removing airborne contaminants produced by processes and occupants and maintaining special environment for specific equipment or processes. Refer to the Schematic of a HVAC System for more information.

Software & Data
The RETScreen Software Ventilation Model can be used worldwide to evaluate the energy use and savings, costs, emission reductions, financial viability and risk for ventilation energy efficiency measures. The software can model a wide variety of projects ranging from small residential heat recovery ventilation systems, to commercial and institutional multiple zone designs including several different ventilation systems, to large industrial facility designs including control of fan and ventilation schedule. The model also considers the impact of one or more operating schedules for the base case and the proposed case building, and it models the cross-effects of other energy efficiency measures employed in the facility (e.g. heating and cooling impact of installing efficient lighting systems). The software (available in multiple languages) also includes product, project and climate databases, and a detailed user manual.

Click here to download RETScreen 4 (36 MB).

e-Textbook / Guides
Heating, Ventilation and Air Conditioning - Guide (4.47 MB)
DDC Control Strategies for Energy Efficiency - Technical fact sheet (281 KB)

Case studies / Templates
Energy efficiency - Commercial - MNECB
Energy efficiency measures - Industrial - Ventilation
Energy efficiency measures - Industrial - Ventilation - Heat recovery
Energy efficiency measures - Institutional - Ventilation - Library / Canada
Energy efficiency measures - Residential - House - Energy efficient
Energy efficiency - Residential - MNECB