Page 28 - 14th @ Irving Basis of Design (internal)

8. The outdoor air processing (ventilation) units will be a VRF type heat pumps and will be located in mechanical rooms on the
event floor. Each outdoor air processing unit will consist of an inlet air box, pre-filters, final filters and a variable speed supply
fan. Each ventilation unit will be provided with a pre-heat coil capable of maintaining the air temperature at the unit air intake
at approximately 30 degrees F when the outdoor temperature is 0 degrees F.

SUPPLEMENTAL HEATING

1. The primary source of the comfort heating will be the air-cooled VRF system.
2. Perimeter hot water finned tube radiators will be provided as the means of supplemental heating, especially in double height
spaces. The heating system shall consist of three (3) 3,000,000 BTU/H modular condensing boilers (one stand-by) and three (3)
HP variable speed pumps (two active, one stand-by) located on the 22 floor boiler room distributing hot water to the retail
nd
and office spaces.
3. The boilers will be arranged in a primary/secondary arrangement. Each boiler will be provided with an integral circulation
pump.
o
o
o
4. Design hot water temperatures will be 150 F hot water supply and 120 F hot water return (30 F Delta T).
5. Office Space heating will be provided by hot water finned tube radiators.
RETAIL AREAS (LEVEL 1)

1. Retail areas on Level One will be treated as shell space and will be provided with the following utilities:
a. Air-cooled outdoor VRF units on the level 1
b. Valved and capped hot water outlets
c. Capped toilet exhaust connections

d. Smoke exhaust.
e. Kitchen exhaust (Level 1 Only)
2. The Level 1 Retail spaces will need to secure their outdoor air supply from exterior louvers located on the exterior wall via VRF
outdoor air processing units.

TOILET EXHAUST
1. The toilet areas will be served by one (1) fan located on the roof.
2. Makeup air for the toilet exhaust system on office floors will be through transfer air ducts between the toilet rooms and
adjacent office corridors.

POST-FIRE SMOKE PURGE SYSTEM
1. A dedicated post-fire smoke purge system will be provided. The system will consist of an exhaust fan, ductwork, combination
fire/smoke dampers and associated controls.
2. The system will be sized to exhaust the largest floor at the rate of 6 air changes per hour.
3. The make-up air will be provided via a dedicated post-fire smoke purge fan located on the roof. The Make-up fan will be
connected to the general exhaust riser with a normally closed control damper. In the smoke purge mode, the general exhaust
fan will be off and the associated damper will be closed. The smoke purge make-up fan will be energized and the associated
damper will open. The smoke purge make-up air fan will be sized to provide 4 air changes per hour on the largest floor.

4. The post fire smoke purge and make-up air fans and associated dampers will be manually controlled from the fire command
station.
5. Each floor will be provided with manually addressable fire/smoke dampers controlled from the fire command station.

14th @ IRVING WSP
Project No. B1809809.000
RAL COMPANIES & AFFILIATES Page 28