I understand that doe2.2 cannot accurately model energy recovery in these
conditions. Would the zones receiving the outside air from the system at
least receive the same tempered air as the dummy zone in the system?
The temperature & humidity of the dummy/duct zone is used in place of the outside air to the system/zones which include the OA-FROM-SYS command. With no loads in this zone, its conditions should be the same as the supply air. To simulate proper dehumidification when modeling a DOAS as PSZ, the zone cooling setpoint schedule would need to be set to 55F or so, and the real DOAS capacities should probably be entered manually. Other model system/zone combinations generally better represent actual DOAS operation, and should be provided as discussion or example by the program authors.
Page 63 of 90.1-2004 lists some surfaces as W/s.f. and some as W/linear ft.,
while others are specified as W per location. It appears to be clear as to
what areas are being referenced in each case. If it?s the building fa?ade
you are questioning, it gives a choice of W/s.f. of illuminated wall surface
or W/linear ft. for each wall being illuminated.
Regards,
Short answer: Yes.
The temperature & humidity of the dummy/duct zone is used in place of the outside air to the system/zones which include the OA-FROM-SYS command. With no loads in this zone, its conditions should be the same as the supply air. To simulate proper dehumidification when modeling a DOAS as PSZ, the zone cooling setpoint schedule would need to be set to 55F or so, and the real DOAS capacities should probably be entered manually. Other model system/zone combinations generally better represent actual DOAS operation, and should be provided as discussion or example by the program authors.
Fred Porter
Folks:
A hopeful simple question.
Page 63 of ASHRAE 90.1-2004 shows lighting power densities for Building
Exteriors. It is all stated in watt/square foot.
Watts per square foot of WHAT? Building sf ?? Parking Lot acreage?
It would seem that building w/sf would be unfair, as an expansive
parking lot (such as in Las Vegas casinos) would be unfairly penalized?
Answers?
Thanks.
John R. Aulbach, PE, CEM
Page 63 of 90.1-2004 lists some surfaces as W/s.f. and some as W/linear ft.,
while others are specified as W per location. It appears to be clear as to
what areas are being referenced in each case. If it?s the building fa?ade
you are questioning, it gives a choice of W/s.f. of illuminated wall surface
or W/linear ft. for each wall being illuminated.
Regards,
Larry O. Degelman, P.E.