Frequently Asked Questions, Abbreviations, Input Filter Descriptions, and More!

Frequently Asked Questions

What is ComStock

ComStock is a U.S. Department of Energy (DOE) model of the U.S. commercial building stock, developed and maintained by NREL. The model takes some building characteristics from DOE's Commercial Prototype Building Models and Commercial Reference Building. However, unlike many other building stock models, ComStock also combines these with a variety of additional public- and private-sector data sets. Collectively, this information provides high-fidelity building stock representation with a realistic diversity of building characteristics.

Abbreviations

DOAS: Dedicated Outdoor Air System

PSZ: Packaged Single Zone (roof top unit)

RTU: Roof Top Unit

DX: Direct eXpansion (air conditioning)

AC: Air Conditioning (if used in an HVAC system type name this implies the sustem uses direct expansion)

HP: Heat Pump

PTAC: Packaged Terminal Air Conditioner (implies direct expansion technology, as opposed to PTHP)

PVAV: Packaged (rooftop) Variable Air Volume

PFP: Parallel Fan-Powered terminal box

PTHP: Packaged Terminal Heat Pump

VAV: Variable Air Volume system

Input Filter Descriptions

Name as Shown Description
in.sqft Square footage of the building
in.rotation Orientation of buildings, in degrees from north axis
in.applicable Whether or not the upgrade is applicable to the building
in.aspect_ratio Ratio of N/S façade length to E/W façade length
in.climate_zone ASHRAE or CEC (California-specific) climate zone of building
in.building_type Building type (see DOE or DEER Building Type Description Table)
in.code_when_built ASHRAE or DEER building code for year built
in.weather_station Name of closest weather station corresponding to building location
in.hvac_system_type HVAC system type in building (see HVAC System Type Description Table)
in.current_hvac_code Code of HVAC system in building (components are assumed to be upgraded according to a replacement schedule)
in.number_of_stories Number of stories in building
in.water_systems_fuel Service water heating fuel source
in.weekday_opening_time Building opening time for Monday-Friday
in.weekend_opening_time Building opening time for Saturday-Sunday
in.current_envelope_code Code of building envelope (components are assumed to be upgraded according to a replacement schedule)
in.weekday_operating_hours Number of hours building is open on Monday-Friday
in.weekend_operating_hours Number of hours building is open on Saturday-Sunday
in.current_exterior_lighting_code Code of building exterior lights (components are assumed to be upgraded according to a replacement schedule)
in.current_interior_lighting_code Code of interior lights in building (components are assumed to be upgraded according to a replacement schedule)
in.current_interior_equipment_code Code of interior equipment in building (components are assumed to be upgraded according to a replacement schedule)

Building Type - National

Link to DOE Building Type Information

Name as Shown Building Type (with link to ASHRAE 90.1 Scorecard)
FullServiceRestaurant Full Service Restaurant
Hospital Hospital
LargeHotel Large Hotel
LargeOffice Large Office
MediumOffice Medium Office
Outpatient Outpatient
PrimarySchool Primary School
QuickServiceRestaurant Quick Service Restaurant
RetailStandalone Stand-alone Retail
RetailStripmall Strip Mall
SecondarySchool Secondary School
SmallHotel Small Hotel
SmallOffice Small Office
Warehouse Warehouse (Non-refrigerated)

Building Type - California

Link to DEER Building Type Information

Name as Shown Building Type
Asm Assembly
ECC Education – Community College
EPr Education – Primary School
ESe Education – Secondary School
EUn Education – University
Gro Grocery
Hsp Health/Medical - Hospital
Htl Lodging - Hotel
MFm Multifamily
MLI Manufacturing – Light Industrial
Mtl Lodging - Motel
Nrs Health/Medical - Nursing Home
OfL Office - Large
OfS Office - Small
RFF Restaurant – Fast-Food
RSD Restaurant – Sit-Down
Rt3 Retail – 3-Story Large
RtL Retail – Single-Story Large
RtS Retail – Small
SCn Storage – Conditioned
SUn Storage – Unconditioned
WRf Storage – Refrigerated Warehouse

HVAC System Type

Name as Shown HVAC Component(s) Heating Fuel Cooling Fuel Delivery
Baseboard district hot water Baseboards District Heating None
Baseboard electric Baseboards Electricity None
Baseboard gas boiler Baseboards Natural Gas None
DOAS with VRF Dedicated Outdoor Air System, Variable Refrigerant Flow Electricity Electricity
DOAS with fan coil air-cooled chiller with boiler Dedicated Outdoor Air System, Fan Coil Natural Gas Electricity
DOAS with fan coil chiller with boiler Dedicated Outdoor Air System, Fan Coil Natural Gas Electricity
DOAS with fan coil district chilled water with district hot water Dedicated Outdoor Air System, Fan Coil District Heating District Cooling
DOAS with water source heat pumps cooling tower with boiler Dedicated Outdoor Air System, Water Source Heat Pumps Natural Gas Electricity
DOAS with water source heat pumps with ground source heat pump Dedicated Outdoor Air System, Ground Source Heat Pumps Electricity Electricity
Direct evap coolers with forced air furnace Unit Heaters, Evaporative Coolers Natural Gas Electricity
Direct evap coolers with gas unit heaters Unit Heaters, Evaporative Cooler Natural Gas Electricity
Direct evap coolers with no heat Evaporative Cooler None Electricity
Fan coil air-cooled chiller with baseboard electric Fan Coil, Baseboards Electricity Electricity
Fan coil air-cooled chiller with boiler Fan Coil Natural Gas Electricity
Fan coil chiller with baseboard electric Fan Coil, Baseboards Electricity Electricity
Fan coil chiller with boiler Fan Coil Natural Gas Electricity
Fan coil chiller with district hot water Fan Coil District Heating Electricity
Fan coil chiller with no heat Fan Coil None Electricity
Fan coil district chilled water with district hot water Fan Coil District Heating District Cooling
Forced air furnace Forced Air Furnace Natural Gas None
Gas unit heaters Unit Heaters Natural Gas None
PSZ-AC district chilled water with district hot water Packaged Single Zone Air Conditioner, Baseboards District Heating District Cooling
PSZ-AC district chilled water with electric coil Packaged Single Zone Air Conditioner, Baseboards Electricity District Cooling
PSZ-AC with baseboard electric Packaged Single Zone Air Conditioner, Baseboards Electricity Electricity
PSZ-AC with baseboard gas boiler Packaged Single Zone Air Conditioner, Baseboards Natural Gas Electricity
PSZ-AC with electric coil Packaged Single Zone Air Conditioner, Baseboards Electricity (Heated Only Zones) Electricity
PSZ-AC with gas boiler Packaged Single Zone Air Conditioner, Baseboards Natural Gas (Heated Only Zones) Electricity
PSZ-AC with gas coil Packaged Single Zone Air Conditioner, Baseboards Natural Gas, Electricity (Heated Only Zones) Electricity
PSZ-AC with gas unit heaters Packaged Single Zone Air Conditioner, Unit Heaters Natural Gas Electricity
PSZ-AC with no heat Packaged Single Zone Air Conditioner None Electricity
PSZ-HP Packaged Single Zone Heat Pump, Baseboards Electricity Electricity
PTAC with baseboard district hot water Packaged Terminal Air Conditioner, Baseboards District Heating Electricity
PTAC with baseboard electric Packaged Terminal Air Conditioner, Baseboards Electricity Electricity
PTAC with baseboard gas boiler Packaged Terminal Air Conditioner, Baseboards Natural Gas Electricity
PTAC with electric coil Packaged Terminal Air Conditioner, Baseboards Electricity (Heated Only Zones) Electricity
PTAC with gas boiler Packaged Terminal Air Conditioner, Baseboards Natural Gas (Heated Only Zones) Electricity
PTAC with gas coil Packaged Terminal Air Conditioner, Baseboards Natural Gas, Electricity (Heated Only Zones) Electricity
PTAC with gas unit heaters Packaged Terminal Air Conditioner, Unit Heaters Natural Gas Electricity
PTAC with no heat Packaged Terminal Air Conditioner None Electricity
PTHP Packaged Terminal Heat Pump, Baseboards Electricity Electricity
PVAV with PFP boxes Packaged Variable Air Volume Parallel Fan-Powered Boxes Electricity Electricity
PVAV with district hot water reheat Packaged Variable Air Volume Reheat District Heating Electricity
PVAV with gas boiler reheat Packaged Variable Air Volume Reheat Natural Gas Electricity
PVAV with gas heat with electric reheat Packaged Variable Air Volume Reheat Gas, Electricity Electricity
Residential AC with baseboard electric Residential Air Conditioning, Baseboards Electricity None
Residential AC with no heat Residential Air Conditioning None None
Residential AC with residential forced air furnace Residential Forced Air Furnace with Air Conditioning None None
Residential forced air furnace Residential Forced Air Furnace Natural Gas None
VAV air-cooled chiller with PFP boxes Variable Air Volume Parallel Fan-Powered Boxes Natural Gas Electricity
VAV air-cooled chiller with gas boiler reheat Variable Air Volume Reheat Natural Gas Electricity
VAV chiller with PFP boxes Variable Air Volume Parallel Fan-Powered Boxes Natural Gas Electricity
VAV chiller with district hot water reheat Variable Air Volume Reheat District Heating Electricity
VAV chiller with gas boiler reheat Variable Air Volume Reheat Natural Gas Electricity
VAV chiller with gas coil reheat Variable Air Volume Gas Reheat Natural Gas Electricity
VAV chiller with no reheat with baseboard electric Variable Air Volume No Reheat, Baseboards Natural Gas, Electricity Electricity
VAV district chilled water with district hot water reheat Variable Air Volume Reheat District Heating District Cooling
VAV district chilled water with gas boiler reheat Variable Air Volume Reheat Natural Gas District Cooling
Water source heat pumps cooling tower with boiler Water Source Heat Pumps Natural Gas Electricity
Water source heat pumps with ground source heat pump Ground Source Heat Pumps Natural Gas Electricity
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