We are seeking a variance for the parking garage HVAC system. Our project is located in Teton Village, Wyoming. Teton Village receives an average snowfall of 185 inches/year. As snowy cars use the garage during the winter, we\'re concerned snow and ice will accumulate in the garage causing a life safety issue. We feel a Snow/Ice melt system is necessary for this space. The following are extracts from ASHRAE 90.1-2004 and ASHRAE Application- ASHRAE HVAC Prescriptive Requirement "Radiant heaters complying with 6.5.8.1 are used to heat unenclosed space". ASHRAE 6.5.8.1 states "Radiant heating shall be used when heating is required for unenclosed spaces". ASHRAE 90.1-2004 states that a Radiant Heating System shall transfer heat primarily (greater than 50%) by infrared radiation. ASHRAE 6.4.3.7 states that Snow/ Ice Melting systems shall include automatic controls capable of shutting off the systems when the pavement temperature is above 50
The floor radiant system and associated controls you are proposing is acceptable as a snow melt system for the garage as an unenclosed space under ASHRAE 90.1-2004. Radiant heat systems emit low-temperature infrared radiation, whether they operate at 80 F or 300 F. The ASHRAE Application Guide is referring to a specific technology, infrared radiators, and not necessarily requiring their use as radiant heaters. Applicable Internationally.