3.3.1 General Information

Thermal  Block Name

Applicability

All projects

Definition

A unique identifies for the thermal block

Units

Text

Input Restrictions

None

Baseline Rules

Not applicable

 

Thermal  Block Description

Applicability

All projects

Definition

A brief description of the thermal block that identifies the spaces and/or zones that make up the thermal block or other descriptive information. The description should tie the thermal block to the building plans.

Units

Text

Input Restrictions

None

Baseline Rules

Not applicable

 

Thermal  Block Type

Applicability

All projects

Definition

Designation of the thermal block as directly conditioned space, semiheated, indirectly conditioned space (i.e., conditioned only by borrowed heating or cooling from an adjacent thermal block), unconditioned space, or plenum (i.e., unoccupied but partially conditioned as a consequence of its role as a path for returning air).

  • Conditioned Space: Is a space that has a heating and/or cooling system of sufficient size to maintain temperatures suitable for human comfort. a cooled space, heated space, or indirectly conditioned space defined as follows:
  • Cooled Space: an enclosed space within a building that is cooled by a cooling  whose sensible output capacity exceeds 5 Btu/h·ft² of floor area.
  • Heated space: an enclosed space within a building that is heated by a heating system whose output capacity relative to the floor area is greater than or equal to the values below.

Climate Zone

Heating Output (Btu/h·ft²)

1 and 2

5

3

10

4 and 5

15

6 and 7

20

8

25

  • Indirectly Conditioned Space: an enclosed space within a building that is not a heated space or a cooled space, which is heated or cooled indirectly by being connected to adjacent space(s) provided:
  • the product of the U-factor(s) and surface area(s) of the space adjacent to connected space(s) exceeds the combined sum of the product of the U-factor(s) and surface area(s) of the space adjoining the outdoors unconditioned spaces, and to or from semiheated spaces (e.g., corridors) or
  • that air from heated or cooled spaces is intentionally transferred (naturally or mechanically) into the space at a rate exceeding 3 ach (e.g., atria).
  • Semi-Heated Space: an enclosed space within a building that is heated by a heating system whose output capacity is greater than or equal to 3.4 Btu/h·ft² of floor area but is not a conditioned space.
  • Unconditioned Space: an enclosed space within a building that is not a conditioned space or a semi heated space. Crawlspaces, attics, and parking garages with natural or mechanical ventilation are not considered enclosed spaces.

Units

List: directly conditioned, indirectly conditioned, semiheated, unconditioned or plenum

Input Restrictions

The default thermal block type is “directly conditioned.”

Baseline Rules

The descriptor is identical for proposed design and baseline building.

 

System Name

Applicability

All projects

Definition

The name of the HVAC system that serves this thermal block. This is the link between the thermal block and an HVAC system. The purpose of this building descriptor is to link the thermal zone to a system (child points to parent). Software can make this link in other ways.

Units

Text, unique

Input Restrictions

None

Baseline Rules

The baseline building HVAC system may be different from the rated building and thermal blocks may be mapped differently. Baseline system types 1-4 and 9-13 are required to have one system per thermal zone. Baseline system types 5-8 are required to be one system per floor.

 

Occupancy Type

Applicability

All projects

Definition

One of three occupancy categories used in determining the baseline building envelope requirements. The three categories are residential, nonresidential, and semi-heated.

Units

List: residential, nonresidential, or semi-heated

Input Restrictions

The input shall be consistent with the building classification and the classifications of the spaces that make up the thermal block.

Baseline Rules

Same as the proposed design

 

Floor Area

Applicability

All projects

Definition

The gross floor area of a thermal block including wall thicknesses and minor spaces for mechanical or electrical services, such as chases, that are not assigned to other thermal blocks. Larger mechanical spaces and electrical rooms should not be combined.

Units

Square feet (ft²)

Input Restrictions

The floor area of the thermal block is derived from the floor area of the individual spaces that make up the thermal block.

Baseline Rules

Same as the proposed design

 

Building EQ


 

Energy Star