Building Types

Natural Ventilated buildings:NV buildings had no mechanical air-conditioning, and the natural Ventilation occurred through operable windows that were directly controlled by the occupants, (de Dear 2002).

Centrally-controlled heating or cooling: HVAC buildings had little or no control over their immediate thermal environment, (de Dear-2002).

Mixed Mode buildings: MM refers to a hybrid strategy for space conditioning that uses natural ventilation through operable windows or passive inlet-vents (either automatically or manually controlled), and then switches over to air conditioning mode whenever natural ventilation is insufficient to provide acceptable comfort while minimizing the energy consumption and operating cost of air conditioning, (Brager G. Mixed-mode cooling. ASHRAE Journal 2006; 48: 31-7).

Conditioned space: An enclosed space within a building where there is intentional control of the space thermal conditions within defined limits using natural, electrical, or mechanical means. Spaces that do  not have heating or cooling systems but rely on natural or mechanical flow of thermal energy  from adjacent spaces to maintain thermal conditions within defined limits are considered  conditioned spaces. Examples include restrooms that use exhaust fans to draw in conditioned air to maintain thermal conditions and atria that rely on natural convection flow to maintain thermal conditions. (Standard Definitions of Building Geometry for Energy Evaluation M. Deru and P. Tortellini; Technical Report NREL/TP-550-38600; 2005).


Unconditioned space:An enclosed space within a building that does not meet the requirements of a conditioned space.Spaces that have no control over thermal conditions but intentionally or unintentionally receive thermal energy from adjacent spaces are considered unconditioned spaces(such as an attached garage on a house or a vestibule with no thermal comfort criteria). Spaces that are ventilated only to maintain air quality are considered un-conditioned spaces(such as a parking garage with no thermal comfort criteria). (Standard Definitions of Building Geometry for Energy Evaluation M. Deru and P. Torcellini; Technical Report NREL/TP-550-38600; 2005).

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