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sure that the building is divided into zones which properly set an appropriate energy budget for lighting and
ventilation in the standard design.
Any local enforcement agency may, at its own discretion, demand that the permit applicant provide special
documentation or justification as to the reasonableness of the way in which the building has been zoned for
the performance compliance calculation.
Standard HVAC System According To Proposed System
Type
Based on the proposed HVAC system entered, the program chooses a standard default system for the
standard design which is run to set the annual energy budget. Table N2-13, from the 2008 Nonresidential
ACM Manual, lists the five mechanical system types from which the software selects a system for the
standard design. Refer to the Nonresidential ACM Manual for detailed information on the standard system
type and characteristics assumed for a variety of proposed system types.
Modeling Like HVAC Systems Together
You may model like systems together as one system provided the following conditions are met:
1. The zones served by the individual units meet the requirements of thermal zones as described in
Inputting Zones by Thermal Characteristics and Occupancy Type; and
2. The equipment is all of the same category. Multiple units of the same type must fall into one of the
specific categories contained within the following pop-up listings:
Cooling Equipment
Heating Equipment
Fan Systems
Water Heaters
Unconditioned Zones
Lighting in unconditioned zones must meet the Standards requirements. However, in most other cases,
modeling unconditioned zones is optional, though it is recommended so that mechanical systems do not
appear to be oversized.
To model an unconditioned zone:
1. Create a Zone within the System which shares the most heat transfer to and from the conditioned space.
In the program, give it a name (e.g., “Warehouse”) and set the occupancy type to Unconditioned.
2. Enter the floor area and ceiling height.
3. Set the Desired Winter Temperature to an appropriate actual winter temperature (e.g., 50F or 10.0C)
and the Desired Summer Temperature to an appropriate actual summer temperature (e.g., 90°F or
32.2C). Do not le a ve the s e ttings for a n unconditione d s pa ce a t the s e ttings for a conditione d s pa ce .
4. Input the major exterior surfaces of the unconditioned zone, such as roof and exterior walls. It may not be
necessary to model relatively small areas of glazing.
5. Create demising partitions in the adjacent conditioned zones to model all surfaces (roof, walls, floor)
between conditioned Zones and unconditioned Zones using the Interior Surface element.
174 • Building Tree
User's Manual EnergyPro Version 5