4.5. SR 04-20-1998 - Laserfiche WebLink

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ELK RIVER ARENA ELK RIVER, MINNESOTA APRIL 8, 1998 FEASABILITY STUDY DETERMINE THE REQUIRED VENTILATION AIR FOR THE FACILITY: The State of Minnesota has adopted ASHRAE 62-1989 as the standard for determining the amount of ventilation air required for acceptable air quality in commercial buildings. The standard requires the following quantities of outdoor air for the arena: 1. The playing surface of an ice arena must be provided with 0.5 ft3/min of outdoor air per square foot of ice surface. The area of the ice surface is 17,172 ft2. The amount of ventilation air that is required for the ice surface is therefore 8,590 ft3/min. The occupants of the arena require 15 ft3/min of outdoor air per person. We have been informed that the summer spectator occupancy is 500 people and the winter occupancy is 1,500 people. The ventilation rate may be reduced if the occupant load is variable and the maximum fully loaded event is less than three hours long. We typically reduce the required ventilation rate by 50%. The amount of outdoor air that is required for a 500 occupant summer event is 3,750 ft3/min. The amount of outdoor air that is required for a 1,500 occupant winter event is 11,250 ft3/min. 3. The total amount of outdoor air required for the arena is 19,840 ft3/min. The ventilation air for the ice surface is typically run during resurfacing operations. The outdoor air for the occupants should be provided whenever the people are present in the facility. The facility currently has a total ventilation air quantity of 36,000 ft3/min. The total amount of ventilation air is in excess of the minimum code requirements. REVIEW OF THE EXISTING ARENA VENTILATION AND DEHUMIDIFICATION SYSTEM: The existing arena ventilation system consists of three exhaust fans that are located over the ice surface. The fans are interconnected to large intake louvers located near the ice on the north end of the arena, below the walking track. The dasher boards extend up above the top of the walking track creating an enclosed corridor on the north end of the arena in front of the intake louvers. We have several concerns pertaining to the present design: 1. The warm, humid intake air enters the arena directly adjacent to the ice surface where the temperature is the coldest. The surfaces near the louvers are frequently saturated with condensation. The condensation has resulted in visible surface rust on the majority of the exposed metal surfaces in the area. 2. The exhaust fans for the arena ventilation system are currently controlled with a manual switch with an override from the carbon monoxide detection system. The fans are typically set to run for ten minutes when the ice resurfacer is being used. The fans are then shut off after the resurfacing is completed. The carbon monoxide detection system will energize the fans if the carbon monoxide levels in the arena are above recommended concentrations. We have the following comments pertaining to the control system: NELSON-RUDIE & ASSOCIATES, INC. Page 4