Hello out there!

I am modeling some PTHPs in a hotel guest room for my baseline model. The design has ventilation airflow of 40 cfm and bath exhaust of 35cfm. My input screen for a typical zone is show in Fig 1 below. I get a warning which reads: ZONE EL3 South Perim Zn (G.S2 in SYSTEM EL3 Sys1 (PTAC) (G.S2) has unused EXHAUST-CFM specified. This has been converted to outside air. (See Fig 2). Looking at the hourly reports the exhaust flow looks good (`~35cfm) , but it doesn't show a supply airflow (Fig 3). However, the summary report shows design OA = 40 cfm. (Fig 4)

Any insights into what I am missing? I can send my files if that would be helpful.

Thanks!
Kevin

Fig 1.

[cid:image003.png at 01CEF1A9.F25AD850]

Fig 2.
[cid:image001.png at 01CEF1AA.5ADB2A10]

Fig 3.

OA and EA

SYSTEM

EL3 Sys1 (PTAC) (G.S2)

Var 17

Var 20

Var 21

Var 22

Var 60

Var 89

Var 319

Var 320

Total system supply air flow rate (cfm)

Total system return air flow rate (cfm)

Total ZONE exhaust air flow rate (cfm)

Outside air infiltration rate (cfm)

(Current hour cfm)/(design cfm)

Plenum exhaust flow rate (cfm)

Hourly summed zone OA CFM for DCV calculation (cfm)

Hourly max zone OA / total flow for DCV calculation (cfm/cfm)

0

0

35.35

0

1

0

0

0

0

0

35.35

0

1

0

0

0

0

0

35.35

0

1

0

0

0

Fig 4.
[cid:image002.png at 01CEF1AB.6327D6E0]

Kevin Coleman, CEM, LEED AP