CASE STUDY: INSTITUTION HVAC

Extreme outdoor temperatures and a high humidity and corrosive environment for indoor pool area

CASE STUDY: INSTITUTION HVAC

Facility: Clareview Community Recreation Centre
Design Designation: LEED® NC Silver
Location: Edmonton, Alberta, Canada

Amenities:

258,000 sq.ft Recreation Center that includes an aquatic centre: 8-Lane 25m pool, leisure pool with lazy river, children’s pool with spray-park, whirlpool, water slide, and diving boards. Fitness centre, indoor running track, concession, two indoor ice surfaces, over-sized gymnasium, change room facilities, child care and play centre, and city Library

Challenge Indoor:

The facility had high humidity and corrosive environment for pool area exhaust.

Solution Indoor:

The high humidity and corrosive environment for pool area exhaust resulted in the following solutions:
a. 304 stainless steel wash-down exhaust air section with interior liners to reduce corrosion.
b. Special epoxy coating on exhaust air fans to reduce corrosion.
c. Enthalpy wheels to recover energy from high temperature and humidity exhaust air.

CFM 75,000 35,000 24,000 12,000 10,000 7,650
Supply Fans 6 Plenum 4 Plenum 3 Plenum 1 Plenum 1 Plenum 1 Plenum
Return Fans 6 Plenum 4 Plenum 3 Plenum No No No
VFD Yes Yes Yes Yes Yes Yes
Pre-Heat Coil – 50% P.Glycol Yes Yes No No No No
Heating Coil – 50% P.Glycol Yes Yes Yes Yes Yes Yes
Cooling Coil – Chilled Water No No Yes Yes No No
Pre-Filter MERV 8 MERV 8 MERV 8 MERV 8 MERV 8 MERV 8
Final Filter MERV 14 MERV 14 MERV 14 MERV 14 No No
Heat Recovery Enthalpy Wheel Enthalpy Wheel No No No No
Mixing Section No No Yes Yes No No
Silencer No No Yes No No No
Humidifier No No Steam No No No
Air Blender Yes Yes Yes No No No
Indoor/Outdoor Indoor Indoor Indoor Indoor Indoor Indoor
Service Corridor No No No No No No
Wall Thickness 4” 4” 4” 4” 4” 4”
Outer Casing 16 Ga. Satin Coat 16 Ga. Satin Coat 16 Ga. Satin Coat 16 Ga. Satin Coat 16 Ga. Satin Coat 16 Ga. Satin Coat
Inner Casing 304 SS in E/A section, 22 Ga. Galvanized in other sections 304 SS in E/A section, 22 Ga. Galvanized in other sections 22 Ga. Galvanized, perforated in fan sections 22 Ga. Galvanized, perforated in fan sections  22 Ga. Galvanized  22 Ga. Galvanized

Challenge Outdoor:

Extreme cold weather climate up to -40C/F

Solution Outdoor:

Extreme cold weather resulted in the implementation of the following solution:
a. 50% propylene glycol for freeze protection on the heating coils.
b. 4” wall thickness for increased R-Value.
c. Air blenders provided to prevent air stratification.
d. Service corridors with unit heaters for rooftop units provide shelter for maintenance staff, and a heated enclosure for piping connections and natural gas humidifiers.
e. Enthalpy wheels to recover energy from exhaust and temper the cold incoming outside air.

CFM 18,000 25,000 13,500 28,000 27,500 30,500
Supply Fans 1 Plenum 1 Plenum 1 Plenum 1 Plenum 1 Plenum 1 Plenum
Return Fans 1 Plenum 1 Plenum 1 Plenum 1 Plenum 1 Plenum 1 Plenum
VFD Yes Yes Yes Yes Yes Yes
Pre-Heat Coil – 50% P.Glycol Yes No No No No No
Heating Coil – 50% P.Glycol Yes Yes Yes Yes Yes Yes
Cooling Coil – Chilled Water Yes Yes Yes Yes Yes Yes
Pre-Filter MERV 8 MERV 8 MERV 8 MERV 8 MERV 8 MERV 8
Final Filter No MERV 14 MERV 14 MERV 14 MERV 14 MERV 14
Heat Recovery Enthalpy Wheel No No No No No
Mixing Section No Yes Yes Yes Yes Yes
Silencer No No Yes No Yes Yes
Humidifier No Steam Steam Steam Steam Steam
Air Blender Yes Yes Yes Yes Yes Yes
Indoor/Outdoor Outdoor Rooftop Outdoor Rooftop Outdoor Rooftop Outdoor Rooftop Outdoor Rooftop Outdoor Rooftop
Service Corridor Yes Yes Yes Yes Yes Yes
Wall Thickness 4” 4” 4” 4” 4” 4”
Outer Casing 16 Ga. Satin Coat 16 Ga. Satin Coat 16 Ga. Satin Coat 16 Ga. Satin Coat 16 Ga. Satin Coat 16 Ga. Satin Coat
Inner Casing 304 SS in E/A section, 22 Ga. Galvanized in other sections 22 Ga. Galvanized, perforated in fan sections 22 Ga. Galvanized, perforated in fan sections 22 Ga. Galvanized, perforated in fan sections 22 Ga. Galvanized, perforated in fan sections  22 Ga. Galvanized
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