The systax used for air system names in BTAP is:

sys_abbr|oa|shr>?|sc>?|sh>?|ssf?|zh>?|zc>?|srf>?

Field “sys_abbr”

Description

System type abbrevation

Values

“sys_1”, “sys_2”, …, “sys_6” for NECB

Field “oa”

Description

Indicates whether there is return air in the supply air

Values

  1. “doas”: dedicated-outdoor air system

  2. “mixed”: system with return air in supply air

Field “shr>?”

Description

Type of heat recovery

Values

  1. “none”: no heat recovery

  2. “erv”: energy recovery device (sensible+latent)

Field “sc>?”

Description

System cooling equipment

Values

  1. “none”: no cooling equipment

  2. “c-chw”: coil-chilled-water

  3. “dx”: direct-expansion

  4. “ccashp”: cold-climate air-source heat pump

  5. “ashp”: air-source heat pump

Field “sh>?”

Description

Primary and backup heating equipment

Values

  1. “none”: no heating equipment

  2. “c-e”: coil-electric

  3. “c-hw”: coil-hot-water

  4. “c-g”: coil-gas

  5. “ccashp”: cold-climate air-source heat pump

  6. “ccashp>c-e”: cold-climate air-source heat pump with electric coil backup

  7. “ccashp>c-g”: cold-climate air-source heat pump with natural gas coil backup

  8. “ccashp>c-hw”: cold-climate air-source heat pump with hot-water coil backup“

  9. “ashp”: air-source heat pump

  10. “ashp>c-e”: air-source heat pump with electric coil backup

  11. “ashp>c-g”: air-source heat pump with natural gas coil backup

  12. “ashp>c-hw”: air-source heat pump with hot-water coil backup“

Field “ssf>?”

Description

System supply fan

Values

  1. “cv”: constant-volume

  2. “vv”: variable-volume

Field “zh>?”

Description

Zone heating equipment

Values

  1. “none”: no zone heating

  2. “b-e”: baseboard electric

  3. “b-hw”: baseboard hot-water

  4. “tpfc”: two-pipe fan coil

  5. “fpfc”: four-pipe fan coil

  6. “pthp”: packaged-terminal heat pump

  7. “pthp>c-e”: packaged-terminal heat pump with electric coil backup

  8. “pthp>c-g”: packaged-terminal heat pump with natural gas coil backup

  9. “pthp>c-hw”: packaged-terminal heat pump with hot-water coil backup

  10. “vrf”: variable-refrigerant flow

  11. “vrf>c-e”: variable-refrigerant flow with electric coil backup

  12. “vrf>c-hw”: variable-refrigerant flow with hot-water coil backup

Field “zc>?”

Desciption

Zone cooling equipment

Values

  1. “none”: no zone cooling

  2. “tpfc”: two-pipe fan coil

  3. “fpfc”: four-pipe fan coil

  4. “ptac”: packaged-terminal air-conditioner

  5. “pthp”: packaged-terminal heat-pump

  6. “vrf”: variable-refrigerant flow

Field “srf>?”

Description

System return fan

Values

  1. “cv”: constant-volume

  2. “vv”: variable-volume

Examples of System Names

sys_1|doas|shr>erv|sc>dx|sh>c-e|ssf>cv|zh>b-e|zc>ptac|srf>none
sys_1|doas|shr>erv|sc>dx|sh>c-e|ssf>cv|zh>b-hw|zc>ptac|srf>none
sys_1|doas|shr>erv|sc>dx|sh>c-hw|ssf>cv|zh>b-e|zc>ptac|srf>none
sys1|doas|shr>erv|sc>dx|sh>c-hw|ssf>cv|zh>b-hw|zc>ptac|srf>none
sys1|doas|shr>erv|sc>ashp|sh>ashp>c-e|ssf>cv|zh>b-e|zc>ptac|srf>none

sys_1|doas|shr>erv|sc>dx|sh>c-g|ssf>cv|zh>tpfc|zc>fpfc|srf>none
sys_1|doas|shr>erv|sc>c-chw|sh>c-g|ssf>cv|zh>tpfc|zc>fpfc|srf>none
sys_1|doas|shr>erv|sc>ashp|sh>ashp>c-e|ssf>cv|zh>tpfc|zc>fpfc|srf>none

sys_3|mixed|shr>erv|sc>dx|sh>c-e|ssf>cv|zc>none|zh>b-e|srf>none
sys_3|mixed|shr>erv|sc>dx|sh>c-e|ssf>cv|zc>none|zh>b-hw|srf>none
sys_3|mixed|shr>erv|sc>dx|sh>c-hw|ssf>cv|zc>none|zh>b-e|srf>none
sys_3|mixed|shr>erv|sc>dx|sh>c-hw|ssf>cv|zc>none|zh>b-hw|srf>none
sys_3|mixed|shr>erv|sc>ashp|sh>ashp>c-e|ssf>cv|zc>none|zh>b-e|srf>none

sys_4|mixed|shr>erv|sc>dx|sh>c-e|ssf>cv|zc>none|zh>b-e|srf>none
sys_4|mixed|shr>erv|sc>dx|sh>c-e|ssf>cv|zc>none|zh>b-hw|srf>none
sys_4|mixed|shr>erv|sc>dx|sh>c-g|ssf>cv|zc>none|zh>b-e|srf>none
sys_4|mixed|shr>erv|sc>dx|sh>c-g|ssf>cv|zc>none|zh>b-hw|srf>none
sys_4|mixed|shr>erv|sc>ashp|sh>ashp>c-e|ssf>cv|zc>none|zh>b-e|srf>none

sys_5|doas|shr>erv|sc>dx|sh>c-g|ssf>cv|zc>tpfc|zh>tpfc|srf>none
sys_5|doas|shr>erv|sc>c-chw|sh>c-g|ssf>cv|zc>tpfc|zh>tpfc|srf>none
sys_5|doas|shr>erv|sc>ashp|sh>ashp>c-e|ssf>cv|zc>tpfc|zh>tpfc|srf>none

sys_6|mixed|shr>erv|sc>c-chw|sh>c-e|ssf>vv|zc>none|zh>b-e|srf>vv
sys_6|mixed|shr>erv|sc>c-chw|sh>c-e|ssf>vv|zc>none|zh>b-hw|srf>vv
sys_6|mixed|shr>erv|sc>c-chw|sh>c-hw|ssf>vv|zc>none|zh>b-e|srf>vv
sys_6|mixed|shr>erv|sc>c-chw|sh>c-hw|ssf>vv|zc>none|zh>b-hw|srf>vv
sys_6|mixed|shr>erv|sc>ashp|sh>ashp>c-e|ssf>vv|zc>none|zh>b-hw|srf>vv