A system that supports simultaneous heating and cooling for different areas of a building is referred to as what?

A system that supports simultaneous heating and cooling for different areas of a building is best described as a heat recovery system. This type of system is designed to capture and utilize waste heat from areas that are being cooled to provide heating to areas that need it.

In such systems, heat exchangers transfer heat from the exhaust air or water of one area to the fresh intake air or water of another area that requires heating. This allows for greater energy efficiency and comfort since it can effectively manage the temperature differences throughout various zones in a building. Thus, heat recovery systems are particularly advantageous in commercial buildings where different spaces have varying heating and cooling needs at the same time.

The other options provide different functionalities: a single-zone HVAC system serves one area without the capability for simultaneous heating and cooling, and a constant flow system typically maintains a steady flow of air or fluid without addressing the need for varied temperature-driven requirements in different zones. While all these systems may have specific applications in HVAC, they do not inherently provide the simultaneous heating and cooling capability that defines a heat recovery system.