HomeMy WebLinkAbout1978-06-13 Park Board Packetqqq i "�
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CLI
BRAEMAR ARENA
SYSTEM CHANGES
1. Remove existing gas drive engines from cpm2ressors and
replace with electric motors.
2. Install two stainless steel tube bundle heat exchangers
in amonia hot has line to provide heat source for zamboni
hot water and for snow melting.
3. Repipe hot water piping in boiler room and compressor room
to utilize heat recovery water. Insulate two existing water
tanks and use for hot water storage.
4. Repair existing contral station air handler. Involves damper
replacement, motor linkage etc.
5. Add motorized control on combustion air damper to be interlocked
with boiler burner.
6. Seal all arena doors to prevent excessive ambient air
infiltration. Install tight sealing counterweighted
dampers on six exhaust fans.
7. Install new dehumidification system. System includes outdoor
air-cooled condensing unit with two indoor air handlers.
Each air handler will be connected to existing air ducts.
8. Isolate arena from office and locker room area with tempered
plywood above existing plexi-glas.
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FEASIBILITY STUDY
OF
BRAEMER ICE ARENA
Refrigeration Equipment
2-"Vilter" VMC 448 HN3Comps.Ea. 309.3 CFM displacement,
capacity 63.6 tons at 20 PSIG (5.50F) suction & 185 PSIG con-
densing (now driven by "Caterpillar" gas engines.) Replaces
with. 2-100 HP 460/3/60,1200 RPM motors, on adjustable bases
with. new "Thomas" direct drive couplings.
1
One "Recold"*YPF X2, Evap. Cond. with desuperheater,
Capacity 3,548,490 BTU's at 96.20F condensing & 750 amb. wet
bulb. This condenser cools the hot discharge gas from both
compressors and water for gas engine drives under certain con-
ditions it is 19+ o short of capacity.
On start up the RPM of refrigeration compressor is 1500,
this is 300 RPM over design operating conditions for these com-
pressors. Vilter warranty reads not over 1200 RPM changing to
electric motors will provide 1200 RPM maximum RPM and take the
® engine load off the E.V.C. providing better operation.
•
All controls, switches, thermometers and gauges should be
tested, repaired, set properly, or be replaced.
Heat Reclaim Desuperheaters
Install in machinery room, mounted up on steel frame,
beside compressors 2-8 5/8" diameter X 12 ft. long, stainless
steel tube, condensers utilizing the 2400 ammonia hot gas dis-
charge, heating enough hot water each hour of operation, for
melting zamboni snow and providing hot water for zamboni ice
making operation.
Hot and cold copper water piping to and from condensers to
be suspended over drive between buildings, insulated, protected
with automotic heat cable from freezing.
Dehumidification, Condensation & Fog
For year -around operation these must be controlled, there
is no valid reason to have these problems as the laws of nature,
which causes these conditions is known.
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Tests made May 10/78 of inside conditons of rink area
showed 740
F to 760F dry bulb & 62 F-63OF wet bulb, with 126
tons (maximum capacity of the two compressors)' being used.
Proper design conditions should be 450F to 480F wet bulb
& 50 to 55OF dry-bulb. With proper dehumidifcation, these
conditions can be provided, saving 63 to 76 tons.
The ice rink area has infiltration problems caused by
the following:
1. Crack leakage around all outside doors, poorly fitted,
need weatherstripping (4"-Ij" cracks),
2. Exhaust fans leakage of 1 to 1% square feet.
3. Openings over and under plastic shields on front end
above deck and below.
4. Gates should be kept closed at all times.:
Estimated infiltration now with 1OMPH South wind (summer)
is 24,000 CFM. Rink area has approximately 48,840 cubic feet so.
you are having a complete air change every 20 minutes. This
amount of air change would handle 4800 people at 5CFM outside
air each.
• Corrections can be made by weatherstripping all outside
doors, install new air tight dampers in exhaust fans and ex-
tending and closing partitions on ends and keeping gate; closed.
Dehumidification can be provided with the installation of
20 to 24 tons of refrigeration equipment.
Rink tonnage can be reduced about 25 tons by installing a
new aluminum ceiling with .04 emissivity, this also saves on
lighting.
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