Abstract

In some heating, ventilating, air-conditioning, and refrigerant (HVAC-R) systems, a limitation on the temperature differential between the interior temperature setpoint and the outdoor temperature can exist to limit energy consumption. For example, when a temperature differential limit = 5 °C and the outdoor temperature = 30 °C, the effective temperature setpoint cannot be below 25 °C even if the user requires a temperature setpoint at 20 °C. This option is effective in terms of energy savings but will affect the user comfort. Air mixing technology with registers (dampers) allows for energy savings by mixing air from interior with air from outdoor (new air). This mixed air will be sent to the evaporator in the air-conditioning (AC) configuration, or to the condenser in heat pump (HP) configuration. In the case of 100% recirculated air and stabilized system, the air temperature at the evaporator outlet will not be directly impacted by outdoor temperature/humidity, contrary to the case of non-air-mixing.

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