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Selection

Why should I change the way I select equipment?

To fully grasp the value of the Design Envelope concept, it's important to understand that from the conception of a building project, and throughout the building operating life, a variety of changing factors might affect the load on the HVAC system:

prior to or during construction, the building material selections might change
changes in the use of the building, or the number of tenants
construction of an adjacent building might block the sunlight
climate change might alter external load factors
building owners might choose to integrate renewable energy sources

If the components of an HVAC system are selected using the "design point" selection process, any or all of the above changes might affect the efficiency of the HVAC system, and they might need to be upgraded. For example, during the design and construction phases of a project, it's very common that the components of an HVAC system would be re-selected a number of times to adjust for design changes, or different selections of building materials. The Design Envelope approach minimizes equipment changes during the design and construction phases of a project, and throughout the life of a building, and provides maximum efficiency through control and component integration.

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