3.7.1 Basic System Information

HVAC System Name
Applicability

All system types
A unique descriptor for each HVAC System

Units Text, unique
Input Restrictions When applicable, this input should match the tags that are used on the plans.
Baseline Rules None
System Type
Applicability All system types
Definition A unique descriptor which identifies the following attributes of an HVAC System:
  • Number of air decks (one to three);
  • Constant or variable air flow;
  • Type of terminal device; and
  • Fan configuration for multiple deck systems.
Units None
Input Restrictions As designed
Baseline Rules Based on the prescribed system type (see [bookref id="hvac-mapping"]). The baseline system types are shown in the table below.

[table title="Baseline Building System Type" id="baseline-building-system-type"]

Baseline Building System System Type
System 1 – PTAC Single Zone Heating and Cooling
System 2 – PTHP Single Zone Heating and Cooling
System 3 – PSZ-AC Single Zone Heating and Cooling
System 4 – PSZ-HP Single Zone Heating and Cooling
System 5 – Packaged VAV with Reheat Single Duct VAV
System 6 – Packaged VAV with PFP boxes Single Duct VAV
System 7 – VAV with Reheat Single Duct VAV
System 8 – VAV with PFP boxes Single Duct VAV
Total Cooling Capacity
Applicability

All system types

Definition The installed cooling capacity of the project. This includes all:
  • Chillers;
  • Built-up DX; and,
  • Packaged cooling units.
Units Cooling tons (12,000 Btu/h per ton)
Input Restrictions As designed. This could be calculated by the program from the proposed design building description or a separate load calculation may be used. Unmet load hours for the simulation shall not exceed 300 annually. Weather conditions used in sizing runs shall be based on 1% dry-bulb and 1% wet-bulb cooling design temperatures.
Baseline Rules Autosize. The cooling capacity shall be oversized by 15%. If the number of unmet load hours of the proposed design exceeds the number of unmet load hours of the baseline by more than 50, decrease the cooling capacity as indicated in [bookref id="calculation-process-for-tax-deductions-and-green-building-ratings"] and [bookref id="procedure-for-adjusting-equipment-hvac-sizes-in-the-baseline-building"].
90.1-2010
HVAC System Name
Applicability

All system types
A unique descriptor for each HVAC System

Units Text, unique
Input Restrictions When applicable, this input should match the tags that are used on the plans.
Baseline Rules None
System Type
Applicability All system types
Definition A unique descriptor which identifies the following attributes of an HVAC System:
  • Number of air decks (one to three);
  • Constant or variable air flow;
  • Type of terminal device; and
  • Fan configuration for multiple deck systems.
Units None
Input Restrictions As designed
Baseline Rules Based on the prescribed system type (see Table 6.7.1-1). The baseline system types are shown in the table below.

Table 6.7.1-1: Baseline Building System Type

Baseline Building System System Type
System 1 – PTAC Single Zone Heating and Cooling
System 2 – PTHP Single Zone Heating and Cooling
System 3 – PSZ-AC Single Zone Heating and Cooling
System 4 – PSZ-HP Single Zone Heating and Cooling
System 5 – Packaged VAV with Reheat Single Duct VAV
System 6 – Packaged VAV with PFP boxes Single Duct VAV
System 7 – VAV with Reheat Single Duct VAV
System 8 – VAV with PFP boxes Single Duct VAV
System 9 – Heating and Ventilation Constant Volume Heat/Vent (no cooling)
System 10 – Heating and Ventilation Constant Volume Heat/Vent (no cooling)
Total Cooling Capacity
Applicability

All system types

Definition The installed cooling capacity of the project. This includes all:
  • Chillers;
  • Built-up DX; and,
  • Packaged cooling units.
Units Cooling tons (12,000 Btu/h per ton)
Input Restrictions As designed. This could be calculated by the program from the proposed design building description or a separate load calculation may be used. Unmet load hours for the simulation shall not exceed 300 annually. Weather conditions used in sizing runs shall be based on 1% dry-bulb and 1% wet-bulb cooling design temperatures.
Baseline Rules Autosize. The cooling capacity shall be oversized by 15%. 
90.1-2016 BM

HVAC System Name

Applicability

All system types
A unique descriptor for each HVAC System

Units

Text, unique

Input Restrictions

When applicable, this input should match the tags that are used on the plans.

Baseline Rules

None

 

System Type

Applicability

All system types

Definition

A unique descriptor which identifies the following attributes of an HVAC System:

  • Number of air decks (one to three);
  • Constant or variable air flow;
  • Type of terminal device; and
  • Fan configuration for multiple deck systems.

Units

List

Input Restrictions

System types listed in Table 3.7-1, plus others supported by the software such as the following:

  • CRAC – Computer Room Air Conditioner
  • CRAH – Computer Room Air Handler
  • FPFC – Four-pipe fan coil
  • DFDD – Dual-fan dual duct
  • RADFLR – Radiant floor heating and cooling
  • WSHP – water-source heat pump

Baseline Rules

The baseline building HVAC system is determined based on the building and space use, size and heating source. See Table 3.7-1.

 

Air Distribution Type

Applicability

All system types

Definition

Type of air distribution system that is coupled with the HVAC system.  The choices are (overhead) mixing ventilation system, underfloor air distribution system (UFAD), and displacement ventilation system (DV).

Units

List:  Mixing, UFAD, DV

Input Restrictions

As designed.

Baseline Rules

Mixing 

 

Thermal Zone List

Applicability

All system types

Definition

Comprehensive list of all thermal zones served by a given HVAC system.

Units

Cooling tons (12,000 Btu/h per ton)

Input Restrictions

As designed.

Baseline Rules

For systems 1, 2, 3, 4, 9, and 10, each zone shall have its own system. For systems 5, 6, 7, and 8, all zones on each floor shall be assigned to a single system. 

 

Total Cooling Capacity

Applicability

All system types

Definition

The installed cooling capacity of the project. This includes all:

  • Chillers;
  • Built-up DX; and,
  • Packaged cooling units.

Units

Cooling tons (12,000 Btu/h per ton)

Input Restrictions

As designed. This could be calculated by the simulation program from the proposed design building description or a separate load calculation may be used. Unmet load hours for the simulation shall not exceed 300 annually. Weather conditions used in sizing runs shall be based on 1% dry-bulb and 1% wet-bulb cooling design temperatures.

Baseline Rules

Autosize. The cooling capacity shall be oversized by 15%. If the number of unmet load hours exceeds 300, increase the cooling capacity according to the procedures in Chapter 2. 

 

Total Heating Capacity

Applicability

All system types

Definition

The installed heating capacity of the project. This includes all:

  • Boilers;
  • Electric Resistance; and,
  • Heat Pump
  • Gas Furnace

Units

Btu/h

Input Restrictions

As designed.

Baseline Rules

Autosize. The cooling capacity shall be oversized by 25%. If the number of unmet load hours exceeds 300, increase the heating capacity according to the procedures in Chapter 2. 

Building EQ
HVAC System Name
Applicability

All system types
A unique descriptor for each HVAC System

Units Text, unique
Input Restrictions When applicable, this input should match the tags that are used on the plans.
System Type
Applicability All system types
Definition A unique descriptor which identifies the following attributes of an HVAC System:
  • Number of air decks (one to three);
  • Constant or variable air flow;
  • Type of terminal device; and
  • Fan configuration for multiple deck systems.
Units None
Input Restrictions As designed
Total Cooling Capacity
Applicability

All system types

Definition The installed cooling capacity of the project. This includes all:
  • Chillers;
  • Built-up DX; and,
  • Packaged cooling units.
Units Cooling tons (12,000 Btu/h per ton)
Input Restrictions As designed. This could be calculated by the program from the proposed design building description or a separate load calculation may be used. Unmet load hours for the simulation shall not exceed 300 annually. Weather conditions used in sizing runs shall be based on 1% dry-bulb and 1% wet-bulb cooling design temperatures.
Energy Star
HVAC System Name
Applicability

All system types
A unique descriptor for each HVAC System

Units Text, unique
Input Restrictions When applicable, this input should match the tags that are used on the plans.
System Type
Applicability All system types
Definition A unique descriptor which identifies the following attributes of an HVAC System:
  • Number of air decks (one to three);
  • Constant or variable air flow;
  • Type of terminal device; and
  • Fan configuration for multiple deck systems.
Units None
Input Restrictions As designed
Total Cooling Capacity
Applicability

All system types

Definition The installed cooling capacity of the project. This includes all:
  • Chillers;
  • Built-up DX; and,
  • Packaged cooling units.
Units Cooling tons (12,000 Btu/h per ton)
Input Restrictions As designed. This could be calculated by the program from the proposed design building description or a separate load calculation may be used. Unmet load hours for the simulation shall not exceed 300 annually. Weather conditions used in sizing runs shall be based on 1% dry-bulb and 1% wet-bulb cooling design temperatures.